Vibecode Buffer
track this build5 phases, 15 steps, beginner friendly0%KINDA · weekend project
Posting to one or two APIs is easy, but maintaining social platform auth, queues, previews, analytics, and API-policy compliance is real ongoing work.
the project pack5 files · written for this build, step by step
You are building a lean indie version of Buffer. Create the following project files first, then implement the application by following them. Keep the files updated as decisions change. Do not collapse this into a single README or prompt. ===== README.md ===== # Buffer · indie build Build a text-only Mastodon posting queue with visible uncertain outcomes. Estimated effort: **multi-day**. Work `BUILD_PLAN.md` top to bottom · every phase ends in a check that has to pass before the next one starts. ## Stack | Part | Choice | Why | | --- | --- | --- | | Runtime | Python 3.12+ and Flask | A small local HTTP application with readable server-side handlers and no JavaScript build pipeline. | | Storage | SQLite through Python sqlite3 | Local ownership with explicit transactions and a portable backup path. | | Interface | Jinja HTML templates, CSS and vanilla JavaScript | Implement the specified screens directly with labelled controls and progressive enhancement. | | Verification | Python unittest and browser acceptance fixtures | Check invariants and the actual user workflow before the next phase. | ## Before you start Have every one of these ready. The plan assumes them from step one. - [ ] **Python 3.12 or newer and a terminal** · Python is free; this local prototype requires no hosting subscription. - Why: The local backend, tests and storage use Python. - Get it: Install Python from python.org. Open a terminal in a new empty project folder. On Windows, use py -3 where this guide says python if python is not on PATH; on macOS/Linux use python3 if needed. Create .venv and activate it before installing packages. - Verify: python --version reports 3.12+ and python -c "import sqlite3" succeeds. - [ ] **A current desktop browser and text editor** · No paid service required for this local step. - Why: You need to view the local interface and edit generated project files. - Get it: Use an installed Chrome, Firefox or Edge browser. Open the empty project folder in your editor; open the terminal there, not in this catalog repository. - Verify: You can create a text file in the project folder and open browser developer tools. - [ ] **Buffer acceptance sample** · No paid service required for this local step. - Why: This fixture makes the first end-to-end check reproducible. - Get it: Create synthetic sample data before implementation: Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Save it under fixtures/ with the expected results in fixtures/README.md; use no real credentials or customer records. - Verify: The fixture files and expected outcomes exist and can be inspected without a vendor account. - [ ] **Confirm the bounded replacement** · No paid service required for this local step. - Why: The full commercial product is larger than this guide. - Get it: The deliverable is a text-only Mastodon posting queue with visible uncertain outcomes. Read every exclusion below. Indie mode runs locally; any public or shared use requires the product access and deployment gates first. - Verify: You can name the primary workflow and the vendor features this version deliberately leaves out. - [ ] **A token for your own Mastodon account** · Instance membership and usage conditions vary; check your instance before sending. - Why: Publishing needs scoped permission on your instance. - Get it: Open your instance preferences, Development, New application. Create an app with the minimal account verification and status-write permissions required by its API; copy its access token to .env. Use a test account and revoke the token when finished. - Verify: The backend verifies the token identity without creating a post. ## Quick start ```sh python -m venv .venv python -m pip install Flask Flask-WTF python-dotenv waitress tzdata python -m pip freeze > requirements.txt python -m flask --app app run --host 127.0.0.1 ``` Then copy `.env.example` to `.env` and fill in the values it documents. ## Honest limits This build deliberately does not replace: - An idempotency key is not a permanent exactly-once guarantee; do not blindly retry after long outages. - This is a text-only Mastodon posting queue with visible uncertain outcomes; full Buffer feature parity, vendor hosting and support are not included. - multi-network API maintenance - post previews - analytics - approvals - mobile apps - team queues - platform policy changes If one of those is essential to you, that is the reason to keep paying for Buffer, and the README should say so rather than pretend. ===== BRIEF.md ===== # Build brief · Buffer The one-shot brief this plan expands. `BUILD_PLAN.md` (or `MILESTONES.md`) is the same sequence broken into steps and checks; where the two disagree, the plan wins. Build me a text-only Mastodon posting queue with visible uncertain outcomes as a bounded replacement for Buffer. Build it in phases in the order below. Do not write the whole product in one pass. Finish the current phase, run its Done when checks, fix failures, then continue. Indie mode completes Phases 1-5. Phase 6 is required before shared or public deployment. ### Stack (fixed, do not substitute) - Runtime: Python 3.12+ and Flask. A small local HTTP application with readable server-side handlers and no JavaScript build pipeline. - Storage: SQLite through Python sqlite3. Local ownership with explicit transactions and a portable backup path. - Interface: Jinja HTML templates, CSS and vanilla JavaScript. Implement the specified screens directly with labelled controls and progressive enhancement. - Verification: Python unittest and browser acceptance fixtures. Check invariants and the actual user workflow before the next phase. ### Data model (create this before Phase 1) - posts(id,text,scheduled_utc,timezone,state,revision) - attempts(id,post_id,idempotency_key,started_at,outcome,remote_id,error) - slots(id,weekday,local_time) - account(id,instance_url) - Use stable ids and explicit relationships; add auxiliary tables named by the phases before those phases use them. - Acceptance fixture: Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. ### Prerequisites and configuration - Python 3.12 or newer and a terminal: Install Python from python.org. Open a terminal in a new empty project folder. On Windows, use py -3 where this guide says python if python is not on PATH; on macOS/Linux use python3 if needed. Create .venv and activate it before installing packages. Verify: python --version reports 3.12+ and python -c "import sqlite3" succeeds. Cost: Python is free; this local prototype requires no hosting subscription. - A current desktop browser and text editor: Use an installed Chrome, Firefox or Edge browser. Open the empty project folder in your editor; open the terminal there, not in this catalog repository. Verify: You can create a text file in the project folder and open browser developer tools. Cost: No paid service required for this local step. - Buffer acceptance sample: Create synthetic sample data before implementation: Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Save it under fixtures/ with the expected results in fixtures/README.md; use no real credentials or customer records. Verify: The fixture files and expected outcomes exist and can be inspected without a vendor account. Cost: No paid service required for this local step. - Confirm the bounded replacement: The deliverable is a text-only Mastodon posting queue with visible uncertain outcomes. Read every exclusion below. Indie mode runs locally; any public or shared use requires the product access and deployment gates first. Verify: You can name the primary workflow and the vendor features this version deliberately leaves out. Cost: No paid service required for this local step. - A token for your own Mastodon account: Open your instance preferences, Development, New application. Create an app with the minimal account verification and status-write permissions required by its API; copy its access token to .env. Use a test account and revoke the token when finished. Verify: The backend verifies the token identity without creating a post. Cost: Instance membership and usage conditions vary; check your instance before sending. - Configuration: DATA_DIR, SECRET_KEY, APP_MODE, SITE_URL, MASTODON_URL, MASTODON_TOKEN. Ship .env.example, replace placeholders and exclude secrets from git. ### Phase 1 · Local foundation and data contract Build: Create the runnable local foundation for a text-only Mastodon posting queue with visible uncertain outcomes, including the real schema and acceptance fixture. - Run the venv command first, then stop and activate it before running the remaining commands. Use your OS instructions: Windows .venv\Scripts\activate.bat in cmd, or .venv\Scripts\Activate.ps1 in PowerShell; macOS/Linux source .venv/bin/activate. Then install the listed packages. Create app.py exposing app, load .env with python-dotenv, and add a /healthz route. Freeze tested dependency versions to requirements.txt. Create .env manually from .env.example; replace SECRET_KEY before launch. Commands, after creating the named files: `python -m venv .venv`; `python -m pip install Flask Flask-WTF python-dotenv waitress tzdata`; `python -m pip freeze > requirements.txt`; `python -m flask --app app run --host 127.0.0.1`. - For database-backed state create schema.sql and db.py using this model: posts(id,text,scheduled_utc,timezone,state,revision); attempts(id,post_id,idempotency_key,started_at,outcome,remote_id,error); slots(id,weekday,local_time); account(id,instance_url). Add the auxiliary relationships explicitly used in later phases; use stable ids, foreign keys, parameterized values and transactions. For canonical files use atomic replacement and hashes instead. Implement python manage.py init and python manage.py seed to create only synthetic data: Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Re-running init must not erase data. Commands, after creating the named files: `python manage.py init`; `python manage.py seed`. - Install Flask-WTF CSRF protection for forms and same-origin fetches, validate Host and Origin against SITE_URL, bound inputs and escape output. Deliberately public intake endpoints get bounded validation and rate limits; signed provider webhooks use signature checks instead of browser CSRF tokens. All other admin routes stay local until product authentication exists. When a later phase tests viewer/member permissions, implement the users, hashed passwords, expiring server sessions and role checks in this foundation first; product mode must never use a fabricated identity from request input. Add error, empty, keyboard-focus and retry states now. - Trap: The Flask development server is for local development only. Loopback binding alone does not replace CSRF and origin validation. Done when: The documented start command serves /healthz and the initial screen at http://127.0.0.1:5000. Restarting preserves the seeded records or canonical files; running init again deletes nothing. A cross-origin state-changing request to an admin route is refused. Do not build yet: Do not start account preflight and composer until these checks pass. ### Phase 2 · Account preflight and composer Build: Account preflight and composer for Buffer: Connect one user-owned Mastodon account with a narrowly scoped token kept on the backend; verify the account before scheduling. - Connect one user-owned Mastodon account with a narrowly scoped token kept on the backend; verify the account before scheduling. - Build a plain-text composer using the instance reported limits and a local validation error when text is too long. - Use Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Check: A revoked token fails preflight without modifying the queue. Then check: A draft remains editable and is not sent during account verification. Add a focused regression for the failure case under test/ using a temporary database or folder and fake external services; also perform the visible workflow in a browser. Commands, after creating the named files: `python -m unittest discover -s test`. - Trap: Instances can differ; do not hardcode a universal character limit or API price. Done when: A revoked token fails preflight without modifying the queue. A draft remains editable and is not sent during account verification. Do not build yet: Do not start timezone slots until these checks pass. ### Phase 3 · Timezone slots Build: Timezone slots for Buffer: Create weekday/local-time slot rules and materialize upcoming slots into UTC with an explicit policy for missing or repeated DST times. - Create weekday/local-time slot rules and materialize upcoming slots into UTC with an explicit policy for missing or repeated DST times. - Support an exact scheduled time override and revision-safe rescheduling; show both local time and UTC in the queue. - Use Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Check: Two posts fill successive free slots without sharing one slot. Then check: The DST fixture creates no duplicate occurrence and displays the chosen policy. Add a focused regression for the failure case under test/ using a temporary database or folder and fake external services; also perform the visible workflow in a browser. Commands, after creating the named files: `python -m unittest discover -s test`. - Trap: A local time string alone cannot uniquely identify an instant around a clock change. Done when: Two posts fill successive free slots without sharing one slot. The DST fixture creates no duplicate occurrence and displays the chosen policy. Do not build yet: Do not start publish and reconcile until these checks pass. ### Phase 4 · Publish and reconcile Build: Publish and reconcile for Buffer: Use POST /api/v1/statuses with a stable Idempotency-Key per post, a lease and accepted/failed/unknown states. - Use POST /api/v1/statuses with a stable Idempotency-Key per post, a lease and accepted/failed/unknown states. - Persist the returned remote id and link only after acknowledgement; bound retries and reconcile uncertain outcomes before a delayed replay. - Use Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Check: Replaying an acknowledged post never makes a second API call. Then check: The simulated timeout becomes unknown and stays visible for review. Add a focused regression for the failure case under test/ using a temporary database or folder and fake external services; also perform the visible workflow in a browser. Commands, after creating the named files: `python -m unittest discover -s test`. - Trap: An idempotency key is not a permanent exactly-once guarantee; do not blindly retry after long outages. Done when: Replaying an acknowledged post never makes a second API call. The simulated timeout becomes unknown and stays visible for review. Do not build yet: Do not start portable delivery and clean-start proof until these checks pass. ### Phase 5 · Portable delivery and clean-start proof Build: Finish the Buffer replacement with a documented first-run path and a recoverable export. - Document prerequisites, every configuration variable, data locations and the three domain workflows: Account preflight and composer; Timezone slots; Publish and reconcile. Include the exclusions, actual costs and source check date 2026-09-05. Commands shown earlier that reference project files are files the builder must implement before running them. - Use sqlite3.Connection.backup for the database in DATA_DIR and pause writers while taking the matching attachment snapshot. Keep schema version, hashes and a manifest for buffer. Restore into a separate empty directory or isolated deployment, with all outbound actions and schedules disabled. Recreate this proof: Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Compare ids/counts and open the result before recording the restore date. Never test a restore over the only live copy. - Use a new folder and only README instructions to reach the fixture outcome. Install from requirements.txt, initialize storage, run the tests and exercise the UI at 375px and 1280px; use keyboard-only controls and inspect browser errors. Record exactly what passed; do not mark unrun checks complete. Commands, after creating the named files: `python -m pip install -r requirements.txt`; `python -m unittest discover -s test`. - Trap: Export without an import or restore rehearsal is not verified portability. Done when: A new folder reaches the documented fixture outcome using only README instructions. A backup restored in isolation preserves the proof data and can be opened. Do not build yet: Do not start operate and share with access controls until these checks pass. ### Phase 6 · Operate and share with access controls (product-builder only) Build: Product-builder only: make a text-only Mastodon posting queue with visible uncertain outcomes operable for its stated audience before allowing remote access. - Add owner/member/viewer authorization as appropriate, password hashes through Werkzeug, expiring server-side sessions, CSRF and login rate limits. Add users, sessions and audit schema migrations plus an owner-init command prompting securely for its password. Enforce ownership on every private read/write/download and fail closed when product setup is incomplete. Existing learner or admin identities must use this same boundary. - Serve app:app with Waitress on loopback behind Caddy HTTPS. Configure trusted proxy headers narrowly, Secure/HttpOnly/SameSite cookies, upload limits, request ids and structured logs without private content. Run background jobs as a separate supervised process when the domain workflow requires them. Commands, after creating the named files: `waitress-serve --listen=127.0.0.1:5000 app:app`. - Add a scheduled encrypted off-host backup using this procedure: Use sqlite3.Connection.backup for the database in DATA_DIR and pause writers while taking the matching attachment snapshot. Keep schema version, hashes and a manifest for buffer. Monitor health, disk space, failed jobs and backup age. Stop the service to test an alert; rehearse recovery with outbound effects disabled and record recovery time. Rotate any exposed credentials and require reconciliation before resuming queues. - Trap: Product mode is additional engineering, not a switch that makes a local prototype production-ready. Done when: An unauthenticated visitor cannot read private records, download private files or mutate the admin surface. A viewer cannot mutate data by making a direct request, and guessed ids cannot cross ownership boundaries. Stopping the service triggers the configured alert and the latest off-host backup restores the fixture in isolation. Do not build yet: Do not add new providers or vendor-scale features until the release gates are recorded. ### Out of scope (and why) - An idempotency key is not a permanent exactly-once guarantee; do not blindly retry after long outages. - This is a text-only Mastodon posting queue with visible uncertain outcomes; full Buffer feature parity, vendor hosting and support are not included. - multi-network API maintenance: retain the paid product if this capability is essential; it is outside this bounded build. - post previews: retain the paid product if this capability is essential; it is outside this bounded build. - analytics: retain the paid product if this capability is essential; it is outside this bounded build. - approvals: retain the paid product if this capability is essential; it is outside this bounded build. - mobile apps: retain the paid product if this capability is essential; it is outside this bounded build. - team queues: retain the paid product if this capability is essential; it is outside this bounded build. - platform policy changes: retain the paid product if this capability is essential; it is outside this bounded build. ### README must contain - Exact install, configure, initialize, start, test and recovery commands for a clean folder. - The schema, fixture, acceptance results, private data locations and export format. - Every prerequisite and secret source, actual running costs and deliberately excluded capabilities. - An honest distinction between tests actually run and checks still awaiting real credentials or deployment. - Dependency documentation reviewed 2026-09-05: https://flask.palletsprojects.com/en/stable/installation/ ; https://docs.python.org/3/library/sqlite3.html ; https://flask-wtf.readthedocs.io/en/1.2.x/csrf/ ; https://docs.pylonsproject.org/projects/waitress/en/stable/usage.html ; https://docs.joinmastodon.org/methods/statuses/ ; https://docs.joinmastodon.org/client/token/. Recheck before upgrading; freeze the versions actually tested. ===== AGENTS.md ===== # Agent instructions · Buffer indie build - Read `README.md` and `BUILD_PLAN.md` before writing code. The stack is fixed: Python 3.12+ and Flask, SQLite through Python sqlite3, Jinja HTML templates, CSS and vanilla JavaScript, Python unittest and browser acceptance fixtures. Do not substitute. - Work one phase at a time, in order. Do not start a phase until every "Done when" item of the previous one passes. - Prefer the fewest moving parts that satisfy the step. No frameworks, services or dependencies the plan does not name. - Secrets live in `.env`, never in source or logs. Keep `.env.example` current when a variable is introduced. - Do not invent cryptography, security guarantees, APIs or compliance claims. - Add a focused test for every destructive, security-sensitive or data-loss path the plan names. - Run the project checks before declaring a phase complete, and record any deliberate shortcut in the README under "Tradeoffs". ## Known traps - The Flask development server is for local development only. Loopback binding alone does not replace CSRF and origin validation. - Instances can differ; do not hardcode a universal character limit or API price. - A local time string alone cannot uniquely identify an instant around a clock change. - An idempotency key is not a permanent exactly-once guarantee; do not blindly retry after long outages. - Export without an import or restore rehearsal is not verified portability. ===== BUILD_PLAN.md ===== # Build plan · Buffer Build a text-only Mastodon posting queue with visible uncertain outcomes. Phases are in dependency order. Each ends in a "Done when" list; treat an unticked item as a blocker, not a note. ## Phase 1 · Local foundation and data contract Create the runnable local foundation for a text-only Mastodon posting queue with visible uncertain outcomes, including the real schema and acceptance fixture. ### Steps 1. Create and start the local application Run the venv command first, then stop and activate it before running the remaining commands. Use your OS instructions: Windows .venv\Scripts\activate.bat in cmd, or .venv\Scripts\Activate.ps1 in PowerShell; macOS/Linux source .venv/bin/activate. Then install the listed packages. Create app.py exposing app, load .env with python-dotenv, and add a /healthz route. Freeze tested dependency versions to requirements.txt. Create .env manually from .env.example; replace SECRET_KEY before launch. Files: `app.py`, `requirements.txt`, `.env.example`, `.gitignore` ```sh python -m venv .venv python -m pip install Flask Flask-WTF python-dotenv waitress tzdata python -m pip freeze > requirements.txt python -m flask --app app run --host 127.0.0.1 ``` 2. Implement storage and seed the named fixture For database-backed state create schema.sql and db.py using this model: posts(id,text,scheduled_utc,timezone,state,revision); attempts(id,post_id,idempotency_key,started_at,outcome,remote_id,error); slots(id,weekday,local_time); account(id,instance_url). Add the auxiliary relationships explicitly used in later phases; use stable ids, foreign keys, parameterized values and transactions. For canonical files use atomic replacement and hashes instead. Implement python manage.py init and python manage.py seed to create only synthetic data: Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Re-running init must not erase data. Files: `schema.sql`, `db.py`, `manage.py`, `fixtures/README.md` ```sh python manage.py init python manage.py seed ``` 3. Protect the local request boundary Install Flask-WTF CSRF protection for forms and same-origin fetches, validate Host and Origin against SITE_URL, bound inputs and escape output. Deliberately public intake endpoints get bounded validation and rate limits; signed provider webhooks use signature checks instead of browser CSRF tokens. All other admin routes stay local until product authentication exists. When a later phase tests viewer/member permissions, implement the users, hashed passwords, expiring server sessions and role checks in this foundation first; product mode must never use a fabricated identity from request input. Add error, empty, keyboard-focus and retry states now. Files: `app.py`, `templates/base.html`, `test/test_foundation.py` ### Done when - [ ] The documented start command serves /healthz and the initial screen at http://127.0.0.1:5000. - [ ] Restarting preserves the seeded records or canonical files; running init again deletes nothing. - [ ] A cross-origin state-changing request to an admin route is refused. ### Watch out - The Flask development server is for local development only. Loopback binding alone does not replace CSRF and origin validation. ## Phase 2 · Account preflight and composer Account preflight and composer for Buffer: Connect one user-owned Mastodon account with a narrowly scoped token kept on the backend; verify the account before scheduling. ### Steps 1. Connect one user-owned Mastodon account with a narrowly scoped token kept on the backend; verify the account before scheduling. Connect one user-owned Mastodon account with a narrowly scoped token kept on the backend; verify the account before scheduling. Files: `features/account_preflight_and_composer.py`, `templates/account_preflight_and_composer.html` 2. Build a plain-text composer using the instance reported limits and a local validation error when text is too long. Build a plain-text composer using the instance reported limits and a local validation error when text is too long. Files: `features/account_preflight_and_composer.py` 3. Exercise the acceptance fixture Use Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Check: A revoked token fails preflight without modifying the queue. Then check: A draft remains editable and is not sent during account verification. Add a focused regression for the failure case under test/ using a temporary database or folder and fake external services; also perform the visible workflow in a browser. Files: `test/test_account_preflight_and_composer.py` ```sh python -m unittest discover -s test ``` ### Done when - [ ] A revoked token fails preflight without modifying the queue. - [ ] A draft remains editable and is not sent during account verification. ### Watch out - Instances can differ; do not hardcode a universal character limit or API price. ## Phase 3 · Timezone slots Timezone slots for Buffer: Create weekday/local-time slot rules and materialize upcoming slots into UTC with an explicit policy for missing or repeated DST times. ### Steps 1. Create weekday/local-time slot rules and materialize upcoming slots into UTC with an explicit policy for missing or repeated DST times. Create weekday/local-time slot rules and materialize upcoming slots into UTC with an explicit policy for missing or repeated DST times. Files: `features/timezone_slots.py`, `templates/timezone_slots.html` 2. Support an exact scheduled time override and revision-safe rescheduling; show both local time and UTC in the queue. Support an exact scheduled time override and revision-safe rescheduling; show both local time and UTC in the queue. Files: `features/timezone_slots.py` 3. Exercise the acceptance fixture Use Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Check: Two posts fill successive free slots without sharing one slot. Then check: The DST fixture creates no duplicate occurrence and displays the chosen policy. Add a focused regression for the failure case under test/ using a temporary database or folder and fake external services; also perform the visible workflow in a browser. Files: `test/test_timezone_slots.py` ```sh python -m unittest discover -s test ``` ### Done when - [ ] Two posts fill successive free slots without sharing one slot. - [ ] The DST fixture creates no duplicate occurrence and displays the chosen policy. ### Watch out - A local time string alone cannot uniquely identify an instant around a clock change. ## Phase 4 · Publish and reconcile Publish and reconcile for Buffer: Use POST /api/v1/statuses with a stable Idempotency-Key per post, a lease and accepted/failed/unknown states. ### Steps 1. Use POST /api/v1/statuses with a stable Idempotency-Key per post, a lease and accepted/failed/unknown states. Use POST /api/v1/statuses with a stable Idempotency-Key per post, a lease and accepted/failed/unknown states. Files: `features/publish_and_reconcile.py`, `templates/publish_and_reconcile.html` 2. Persist the returned remote id and link only after acknowledgement; bound retries and reconcile uncertain outcomes before a delayed replay. Persist the returned remote id and link only after acknowledgement; bound retries and reconcile uncertain outcomes before a delayed replay. Files: `features/publish_and_reconcile.py` 3. Exercise the acceptance fixture Use Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Check: Replaying an acknowledged post never makes a second API call. Then check: The simulated timeout becomes unknown and stays visible for review. Add a focused regression for the failure case under test/ using a temporary database or folder and fake external services; also perform the visible workflow in a browser. Files: `test/test_publish_and_reconcile.py` ```sh python -m unittest discover -s test ``` ### Done when - [ ] Replaying an acknowledged post never makes a second API call. - [ ] The simulated timeout becomes unknown and stays visible for review. ### Watch out - An idempotency key is not a permanent exactly-once guarantee; do not blindly retry after long outages. ## Phase 5 · Portable delivery and clean-start proof Finish the Buffer replacement with a documented first-run path and a recoverable export. ### Steps 1. Write the user-facing runbook Document prerequisites, every configuration variable, data locations and the three domain workflows: Account preflight and composer; Timezone slots; Publish and reconcile. Include the exclusions, actual costs and source check date 2026-09-05. Commands shown earlier that reference project files are files the builder must implement before running them. Files: `README.md`, `.env.example` 2. Create and rehearse a recoverable backup Use sqlite3.Connection.backup for the database in DATA_DIR and pause writers while taking the matching attachment snapshot. Keep schema version, hashes and a manifest for buffer. Restore into a separate empty directory or isolated deployment, with all outbound actions and schedules disabled. Recreate this proof: Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Compare ids/counts and open the result before recording the restore date. Never test a restore over the only live copy. Files: `OPERATIONS.md`, `scripts/backup.py` 3. Reproduce the first-run experience Use a new folder and only README instructions to reach the fixture outcome. Install from requirements.txt, initialize storage, run the tests and exercise the UI at 375px and 1280px; use keyboard-only controls and inspect browser errors. Record exactly what passed; do not mark unrun checks complete. Files: `README.md`, `verification.md` ```sh python -m pip install -r requirements.txt python -m unittest discover -s test ``` ### Done when - [ ] A new folder reaches the documented fixture outcome using only README instructions. - [ ] A backup restored in isolation preserves the proof data and can be opened. ### Watch out - Export without an import or restore rehearsal is not verified portability. ## Not in this build - An idempotency key is not a permanent exactly-once guarantee; do not blindly retry after long outages. - This is a text-only Mastodon posting queue with visible uncertain outcomes; full Buffer feature parity, vendor hosting and support are not included. - multi-network API maintenance - post previews - analytics - approvals - mobile apps - team queues - platform policy changes ## After v1, if you want it - Extend publish and reconcile only after the fixture and recovery checks pass. - Before adding another integration, document its credentials, limits, cost and failure behavior with primary-source links. ===== .env.example ===== # Copy to .env and fill in. Never commit .env; this file documents it. # Required. A new private folder this application creates on first run; never serve it as static files. DATA_DIR=./data/buffer # Required · secret. Generate with python -c "import secrets; print(secrets.token_hex(32))" and save only in .env. SECRET_KEY=replace-with-a-random-secret # Required. Use indie for loopback-only personal work. Product mode must refuse to start until owner login and the deployment gates are configured. APP_MODE=indie # Required. The origin used for local forms and links; replace with the chosen HTTPS origin in product mode. SITE_URL=http://127.0.0.1:5000 # Required. Your actual instance origin, validated and allowlisted by the owner. MASTODON_URL=https://your-instance.example # Required · secret. The access token created in your own instance Development settings. MASTODON_TOKEN=replace-with-scoped-token
You are building a lean indie version of Buffer. Create the following project files first, then implement the application by following them. Keep the files updated as decisions change. Do not collapse this into a single README or prompt. ===== README.md ===== # Buffer · indie build Build a text-only Mastodon posting queue with visible uncertain outcomes. Estimated effort: **multi-day**. Work `BUILD_PLAN.md` top to bottom · every phase ends in a check that has to pass before the next one starts. ## Stack | Part | Choice | Why | | --- | --- | --- | | Runtime | Python 3.12+ and Flask | A small local HTTP application with readable server-side handlers and no JavaScript build pipeline. | | Storage | SQLite through Python sqlite3 | Local ownership with explicit transactions and a portable backup path. | | Interface | Jinja HTML templates, CSS and vanilla JavaScript | Implement the specified screens directly with labelled controls and progressive enhancement. | | Verification | Python unittest and browser acceptance fixtures | Check invariants and the actual user workflow before the next phase. | ## Before you start Have every one of these ready. The plan assumes them from step one. - [ ] **Python 3.12 or newer and a terminal** · Python is free; this local prototype requires no hosting subscription. - Why: The local backend, tests and storage use Python. - Get it: Install Python from python.org. Open a terminal in a new empty project folder. On Windows, use py -3 where this guide says python if python is not on PATH; on macOS/Linux use python3 if needed. Create .venv and activate it before installing packages. - Verify: python --version reports 3.12+ and python -c "import sqlite3" succeeds. - [ ] **A current desktop browser and text editor** · No paid service required for this local step. - Why: You need to view the local interface and edit generated project files. - Get it: Use an installed Chrome, Firefox or Edge browser. Open the empty project folder in your editor; open the terminal there, not in this catalog repository. - Verify: You can create a text file in the project folder and open browser developer tools. - [ ] **Buffer acceptance sample** · No paid service required for this local step. - Why: This fixture makes the first end-to-end check reproducible. - Get it: Create synthetic sample data before implementation: Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Save it under fixtures/ with the expected results in fixtures/README.md; use no real credentials or customer records. - Verify: The fixture files and expected outcomes exist and can be inspected without a vendor account. - [ ] **Confirm the bounded replacement** · No paid service required for this local step. - Why: The full commercial product is larger than this guide. - Get it: The deliverable is a text-only Mastodon posting queue with visible uncertain outcomes. Read every exclusion below. Indie mode runs locally; any public or shared use requires the product access and deployment gates first. - Verify: You can name the primary workflow and the vendor features this version deliberately leaves out. - [ ] **A token for your own Mastodon account** · Instance membership and usage conditions vary; check your instance before sending. - Why: Publishing needs scoped permission on your instance. - Get it: Open your instance preferences, Development, New application. Create an app with the minimal account verification and status-write permissions required by its API; copy its access token to .env. Use a test account and revoke the token when finished. - Verify: The backend verifies the token identity without creating a post. ## Quick start ```sh python -m venv .venv python -m pip install Flask Flask-WTF python-dotenv waitress tzdata python -m pip freeze > requirements.txt python -m flask --app app run --host 127.0.0.1 ``` Then copy `.env.example` to `.env` and fill in the values it documents. ## Honest limits This build deliberately does not replace: - An idempotency key is not a permanent exactly-once guarantee; do not blindly retry after long outages. - This is a text-only Mastodon posting queue with visible uncertain outcomes; full Buffer feature parity, vendor hosting and support are not included. - multi-network API maintenance - post previews - analytics - approvals - mobile apps - team queues - platform policy changes If one of those is essential to you, that is the reason to keep paying for Buffer, and the README should say so rather than pretend. ===== BRIEF.md ===== # Build brief · Buffer The one-shot brief this plan expands. `BUILD_PLAN.md` (or `MILESTONES.md`) is the same sequence broken into steps and checks; where the two disagree, the plan wins. Build me a text-only Mastodon posting queue with visible uncertain outcomes as a bounded replacement for Buffer. Build it in phases in the order below. Do not write the whole product in one pass. Finish the current phase, run its Done when checks, fix failures, then continue. Indie mode completes Phases 1-5. Phase 6 is required before shared or public deployment. ### Stack (fixed, do not substitute) - Runtime: Python 3.12+ and Flask. A small local HTTP application with readable server-side handlers and no JavaScript build pipeline. - Storage: SQLite through Python sqlite3. Local ownership with explicit transactions and a portable backup path. - Interface: Jinja HTML templates, CSS and vanilla JavaScript. Implement the specified screens directly with labelled controls and progressive enhancement. - Verification: Python unittest and browser acceptance fixtures. Check invariants and the actual user workflow before the next phase. ### Data model (create this before Phase 1) - posts(id,text,scheduled_utc,timezone,state,revision) - attempts(id,post_id,idempotency_key,started_at,outcome,remote_id,error) - slots(id,weekday,local_time) - account(id,instance_url) - Use stable ids and explicit relationships; add auxiliary tables named by the phases before those phases use them. - Acceptance fixture: Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. ### Prerequisites and configuration - Python 3.12 or newer and a terminal: Install Python from python.org. Open a terminal in a new empty project folder. On Windows, use py -3 where this guide says python if python is not on PATH; on macOS/Linux use python3 if needed. Create .venv and activate it before installing packages. Verify: python --version reports 3.12+ and python -c "import sqlite3" succeeds. Cost: Python is free; this local prototype requires no hosting subscription. - A current desktop browser and text editor: Use an installed Chrome, Firefox or Edge browser. Open the empty project folder in your editor; open the terminal there, not in this catalog repository. Verify: You can create a text file in the project folder and open browser developer tools. Cost: No paid service required for this local step. - Buffer acceptance sample: Create synthetic sample data before implementation: Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Save it under fixtures/ with the expected results in fixtures/README.md; use no real credentials or customer records. Verify: The fixture files and expected outcomes exist and can be inspected without a vendor account. Cost: No paid service required for this local step. - Confirm the bounded replacement: The deliverable is a text-only Mastodon posting queue with visible uncertain outcomes. Read every exclusion below. Indie mode runs locally; any public or shared use requires the product access and deployment gates first. Verify: You can name the primary workflow and the vendor features this version deliberately leaves out. Cost: No paid service required for this local step. - A token for your own Mastodon account: Open your instance preferences, Development, New application. Create an app with the minimal account verification and status-write permissions required by its API; copy its access token to .env. Use a test account and revoke the token when finished. Verify: The backend verifies the token identity without creating a post. Cost: Instance membership and usage conditions vary; check your instance before sending. - Configuration: DATA_DIR, SECRET_KEY, APP_MODE, SITE_URL, MASTODON_URL, MASTODON_TOKEN. Ship .env.example, replace placeholders and exclude secrets from git. ### Phase 1 · Local foundation and data contract Build: Create the runnable local foundation for a text-only Mastodon posting queue with visible uncertain outcomes, including the real schema and acceptance fixture. - Run the venv command first, then stop and activate it before running the remaining commands. Use your OS instructions: Windows .venv\Scripts\activate.bat in cmd, or .venv\Scripts\Activate.ps1 in PowerShell; macOS/Linux source .venv/bin/activate. Then install the listed packages. Create app.py exposing app, load .env with python-dotenv, and add a /healthz route. Freeze tested dependency versions to requirements.txt. Create .env manually from .env.example; replace SECRET_KEY before launch. Commands, after creating the named files: `python -m venv .venv`; `python -m pip install Flask Flask-WTF python-dotenv waitress tzdata`; `python -m pip freeze > requirements.txt`; `python -m flask --app app run --host 127.0.0.1`. - For database-backed state create schema.sql and db.py using this model: posts(id,text,scheduled_utc,timezone,state,revision); attempts(id,post_id,idempotency_key,started_at,outcome,remote_id,error); slots(id,weekday,local_time); account(id,instance_url). Add the auxiliary relationships explicitly used in later phases; use stable ids, foreign keys, parameterized values and transactions. For canonical files use atomic replacement and hashes instead. Implement python manage.py init and python manage.py seed to create only synthetic data: Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Re-running init must not erase data. Commands, after creating the named files: `python manage.py init`; `python manage.py seed`. - Install Flask-WTF CSRF protection for forms and same-origin fetches, validate Host and Origin against SITE_URL, bound inputs and escape output. Deliberately public intake endpoints get bounded validation and rate limits; signed provider webhooks use signature checks instead of browser CSRF tokens. All other admin routes stay local until product authentication exists. When a later phase tests viewer/member permissions, implement the users, hashed passwords, expiring server sessions and role checks in this foundation first; product mode must never use a fabricated identity from request input. Add error, empty, keyboard-focus and retry states now. - Trap: The Flask development server is for local development only. Loopback binding alone does not replace CSRF and origin validation. Done when: The documented start command serves /healthz and the initial screen at http://127.0.0.1:5000. Restarting preserves the seeded records or canonical files; running init again deletes nothing. A cross-origin state-changing request to an admin route is refused. Do not build yet: Do not start account preflight and composer until these checks pass. ### Phase 2 · Account preflight and composer Build: Account preflight and composer for Buffer: Connect one user-owned Mastodon account with a narrowly scoped token kept on the backend; verify the account before scheduling. - Connect one user-owned Mastodon account with a narrowly scoped token kept on the backend; verify the account before scheduling. - Build a plain-text composer using the instance reported limits and a local validation error when text is too long. - Use Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Check: A revoked token fails preflight without modifying the queue. Then check: A draft remains editable and is not sent during account verification. Add a focused regression for the failure case under test/ using a temporary database or folder and fake external services; also perform the visible workflow in a browser. Commands, after creating the named files: `python -m unittest discover -s test`. - Trap: Instances can differ; do not hardcode a universal character limit or API price. Done when: A revoked token fails preflight without modifying the queue. A draft remains editable and is not sent during account verification. Do not build yet: Do not start timezone slots until these checks pass. ### Phase 3 · Timezone slots Build: Timezone slots for Buffer: Create weekday/local-time slot rules and materialize upcoming slots into UTC with an explicit policy for missing or repeated DST times. - Create weekday/local-time slot rules and materialize upcoming slots into UTC with an explicit policy for missing or repeated DST times. - Support an exact scheduled time override and revision-safe rescheduling; show both local time and UTC in the queue. - Use Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Check: Two posts fill successive free slots without sharing one slot. Then check: The DST fixture creates no duplicate occurrence and displays the chosen policy. Add a focused regression for the failure case under test/ using a temporary database or folder and fake external services; also perform the visible workflow in a browser. Commands, after creating the named files: `python -m unittest discover -s test`. - Trap: A local time string alone cannot uniquely identify an instant around a clock change. Done when: Two posts fill successive free slots without sharing one slot. The DST fixture creates no duplicate occurrence and displays the chosen policy. Do not build yet: Do not start publish and reconcile until these checks pass. ### Phase 4 · Publish and reconcile Build: Publish and reconcile for Buffer: Use POST /api/v1/statuses with a stable Idempotency-Key per post, a lease and accepted/failed/unknown states. - Use POST /api/v1/statuses with a stable Idempotency-Key per post, a lease and accepted/failed/unknown states. - Persist the returned remote id and link only after acknowledgement; bound retries and reconcile uncertain outcomes before a delayed replay. - Use Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Check: Replaying an acknowledged post never makes a second API call. Then check: The simulated timeout becomes unknown and stays visible for review. Add a focused regression for the failure case under test/ using a temporary database or folder and fake external services; also perform the visible workflow in a browser. Commands, after creating the named files: `python -m unittest discover -s test`. - Trap: An idempotency key is not a permanent exactly-once guarantee; do not blindly retry after long outages. Done when: Replaying an acknowledged post never makes a second API call. The simulated timeout becomes unknown and stays visible for review. Do not build yet: Do not start portable delivery and clean-start proof until these checks pass. ### Phase 5 · Portable delivery and clean-start proof Build: Finish the Buffer replacement with a documented first-run path and a recoverable export. - Document prerequisites, every configuration variable, data locations and the three domain workflows: Account preflight and composer; Timezone slots; Publish and reconcile. Include the exclusions, actual costs and source check date 2026-09-05. Commands shown earlier that reference project files are files the builder must implement before running them. - Use sqlite3.Connection.backup for the database in DATA_DIR and pause writers while taking the matching attachment snapshot. Keep schema version, hashes and a manifest for buffer. Restore into a separate empty directory or isolated deployment, with all outbound actions and schedules disabled. Recreate this proof: Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Compare ids/counts and open the result before recording the restore date. Never test a restore over the only live copy. - Use a new folder and only README instructions to reach the fixture outcome. Install from requirements.txt, initialize storage, run the tests and exercise the UI at 375px and 1280px; use keyboard-only controls and inspect browser errors. Record exactly what passed; do not mark unrun checks complete. Commands, after creating the named files: `python -m pip install -r requirements.txt`; `python -m unittest discover -s test`. - Trap: Export without an import or restore rehearsal is not verified portability. Done when: A new folder reaches the documented fixture outcome using only README instructions. A backup restored in isolation preserves the proof data and can be opened. Do not build yet: Do not start operate and share with access controls until these checks pass. ### Phase 6 · Operate and share with access controls (product-builder only) Build: Product-builder only: make a text-only Mastodon posting queue with visible uncertain outcomes operable for its stated audience before allowing remote access. - Add owner/member/viewer authorization as appropriate, password hashes through Werkzeug, expiring server-side sessions, CSRF and login rate limits. Add users, sessions and audit schema migrations plus an owner-init command prompting securely for its password. Enforce ownership on every private read/write/download and fail closed when product setup is incomplete. Existing learner or admin identities must use this same boundary. - Serve app:app with Waitress on loopback behind Caddy HTTPS. Configure trusted proxy headers narrowly, Secure/HttpOnly/SameSite cookies, upload limits, request ids and structured logs without private content. Run background jobs as a separate supervised process when the domain workflow requires them. Commands, after creating the named files: `waitress-serve --listen=127.0.0.1:5000 app:app`. - Add a scheduled encrypted off-host backup using this procedure: Use sqlite3.Connection.backup for the database in DATA_DIR and pause writers while taking the matching attachment snapshot. Keep schema version, hashes and a manifest for buffer. Monitor health, disk space, failed jobs and backup age. Stop the service to test an alert; rehearse recovery with outbound effects disabled and record recovery time. Rotate any exposed credentials and require reconciliation before resuming queues. - Trap: Product mode is additional engineering, not a switch that makes a local prototype production-ready. Done when: An unauthenticated visitor cannot read private records, download private files or mutate the admin surface. A viewer cannot mutate data by making a direct request, and guessed ids cannot cross ownership boundaries. Stopping the service triggers the configured alert and the latest off-host backup restores the fixture in isolation. Do not build yet: Do not add new providers or vendor-scale features until the release gates are recorded. ### Out of scope (and why) - An idempotency key is not a permanent exactly-once guarantee; do not blindly retry after long outages. - This is a text-only Mastodon posting queue with visible uncertain outcomes; full Buffer feature parity, vendor hosting and support are not included. - multi-network API maintenance: retain the paid product if this capability is essential; it is outside this bounded build. - post previews: retain the paid product if this capability is essential; it is outside this bounded build. - analytics: retain the paid product if this capability is essential; it is outside this bounded build. - approvals: retain the paid product if this capability is essential; it is outside this bounded build. - mobile apps: retain the paid product if this capability is essential; it is outside this bounded build. - team queues: retain the paid product if this capability is essential; it is outside this bounded build. - platform policy changes: retain the paid product if this capability is essential; it is outside this bounded build. ### README must contain - Exact install, configure, initialize, start, test and recovery commands for a clean folder. - The schema, fixture, acceptance results, private data locations and export format. - Every prerequisite and secret source, actual running costs and deliberately excluded capabilities. - An honest distinction between tests actually run and checks still awaiting real credentials or deployment. - Dependency documentation reviewed 2026-09-05: https://flask.palletsprojects.com/en/stable/installation/ ; https://docs.python.org/3/library/sqlite3.html ; https://flask-wtf.readthedocs.io/en/1.2.x/csrf/ ; https://docs.pylonsproject.org/projects/waitress/en/stable/usage.html ; https://docs.joinmastodon.org/methods/statuses/ ; https://docs.joinmastodon.org/client/token/. Recheck before upgrading; freeze the versions actually tested. ===== AGENTS.md ===== # Agent instructions · Buffer indie build - Read `README.md` and `BUILD_PLAN.md` before writing code. The stack is fixed: Python 3.12+ and Flask, SQLite through Python sqlite3, Jinja HTML templates, CSS and vanilla JavaScript, Python unittest and browser acceptance fixtures. Do not substitute. - Work one phase at a time, in order. Do not start a phase until every "Done when" item of the previous one passes. - Prefer the fewest moving parts that satisfy the step. No frameworks, services or dependencies the plan does not name. - Secrets live in `.env`, never in source or logs. Keep `.env.example` current when a variable is introduced. - Do not invent cryptography, security guarantees, APIs or compliance claims. - Add a focused test for every destructive, security-sensitive or data-loss path the plan names. - Run the project checks before declaring a phase complete, and record any deliberate shortcut in the README under "Tradeoffs". ## Known traps - The Flask development server is for local development only. Loopback binding alone does not replace CSRF and origin validation. - Instances can differ; do not hardcode a universal character limit or API price. - A local time string alone cannot uniquely identify an instant around a clock change. - An idempotency key is not a permanent exactly-once guarantee; do not blindly retry after long outages. - Export without an import or restore rehearsal is not verified portability. ===== BUILD_PLAN.md ===== # Build plan · Buffer Build a text-only Mastodon posting queue with visible uncertain outcomes. Phases are in dependency order. Each ends in a "Done when" list; treat an unticked item as a blocker, not a note. ## Phase 1 · Local foundation and data contract Create the runnable local foundation for a text-only Mastodon posting queue with visible uncertain outcomes, including the real schema and acceptance fixture. ### Steps 1. Create and start the local application Run the venv command first, then stop and activate it before running the remaining commands. Use your OS instructions: Windows .venv\Scripts\activate.bat in cmd, or .venv\Scripts\Activate.ps1 in PowerShell; macOS/Linux source .venv/bin/activate. Then install the listed packages. Create app.py exposing app, load .env with python-dotenv, and add a /healthz route. Freeze tested dependency versions to requirements.txt. Create .env manually from .env.example; replace SECRET_KEY before launch. Files: `app.py`, `requirements.txt`, `.env.example`, `.gitignore` ```sh python -m venv .venv python -m pip install Flask Flask-WTF python-dotenv waitress tzdata python -m pip freeze > requirements.txt python -m flask --app app run --host 127.0.0.1 ``` 2. Implement storage and seed the named fixture For database-backed state create schema.sql and db.py using this model: posts(id,text,scheduled_utc,timezone,state,revision); attempts(id,post_id,idempotency_key,started_at,outcome,remote_id,error); slots(id,weekday,local_time); account(id,instance_url). Add the auxiliary relationships explicitly used in later phases; use stable ids, foreign keys, parameterized values and transactions. For canonical files use atomic replacement and hashes instead. Implement python manage.py init and python manage.py seed to create only synthetic data: Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Re-running init must not erase data. Files: `schema.sql`, `db.py`, `manage.py`, `fixtures/README.md` ```sh python manage.py init python manage.py seed ``` 3. Protect the local request boundary Install Flask-WTF CSRF protection for forms and same-origin fetches, validate Host and Origin against SITE_URL, bound inputs and escape output. Deliberately public intake endpoints get bounded validation and rate limits; signed provider webhooks use signature checks instead of browser CSRF tokens. All other admin routes stay local until product authentication exists. When a later phase tests viewer/member permissions, implement the users, hashed passwords, expiring server sessions and role checks in this foundation first; product mode must never use a fabricated identity from request input. Add error, empty, keyboard-focus and retry states now. Files: `app.py`, `templates/base.html`, `test/test_foundation.py` ### Done when - [ ] The documented start command serves /healthz and the initial screen at http://127.0.0.1:5000. - [ ] Restarting preserves the seeded records or canonical files; running init again deletes nothing. - [ ] A cross-origin state-changing request to an admin route is refused. ### Watch out - The Flask development server is for local development only. Loopback binding alone does not replace CSRF and origin validation. ## Phase 2 · Account preflight and composer Account preflight and composer for Buffer: Connect one user-owned Mastodon account with a narrowly scoped token kept on the backend; verify the account before scheduling. ### Steps 1. Connect one user-owned Mastodon account with a narrowly scoped token kept on the backend; verify the account before scheduling. Connect one user-owned Mastodon account with a narrowly scoped token kept on the backend; verify the account before scheduling. Files: `features/account_preflight_and_composer.py`, `templates/account_preflight_and_composer.html` 2. Build a plain-text composer using the instance reported limits and a local validation error when text is too long. Build a plain-text composer using the instance reported limits and a local validation error when text is too long. Files: `features/account_preflight_and_composer.py` 3. Exercise the acceptance fixture Use Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Check: A revoked token fails preflight without modifying the queue. Then check: A draft remains editable and is not sent during account verification. Add a focused regression for the failure case under test/ using a temporary database or folder and fake external services; also perform the visible workflow in a browser. Files: `test/test_account_preflight_and_composer.py` ```sh python -m unittest discover -s test ``` ### Done when - [ ] A revoked token fails preflight without modifying the queue. - [ ] A draft remains editable and is not sent during account verification. ### Watch out - Instances can differ; do not hardcode a universal character limit or API price. ## Phase 3 · Timezone slots Timezone slots for Buffer: Create weekday/local-time slot rules and materialize upcoming slots into UTC with an explicit policy for missing or repeated DST times. ### Steps 1. Create weekday/local-time slot rules and materialize upcoming slots into UTC with an explicit policy for missing or repeated DST times. Create weekday/local-time slot rules and materialize upcoming slots into UTC with an explicit policy for missing or repeated DST times. Files: `features/timezone_slots.py`, `templates/timezone_slots.html` 2. Support an exact scheduled time override and revision-safe rescheduling; show both local time and UTC in the queue. Support an exact scheduled time override and revision-safe rescheduling; show both local time and UTC in the queue. Files: `features/timezone_slots.py` 3. Exercise the acceptance fixture Use Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Check: Two posts fill successive free slots without sharing one slot. Then check: The DST fixture creates no duplicate occurrence and displays the chosen policy. Add a focused regression for the failure case under test/ using a temporary database or folder and fake external services; also perform the visible workflow in a browser. Files: `test/test_timezone_slots.py` ```sh python -m unittest discover -s test ``` ### Done when - [ ] Two posts fill successive free slots without sharing one slot. - [ ] The DST fixture creates no duplicate occurrence and displays the chosen policy. ### Watch out - A local time string alone cannot uniquely identify an instant around a clock change. ## Phase 4 · Publish and reconcile Publish and reconcile for Buffer: Use POST /api/v1/statuses with a stable Idempotency-Key per post, a lease and accepted/failed/unknown states. ### Steps 1. Use POST /api/v1/statuses with a stable Idempotency-Key per post, a lease and accepted/failed/unknown states. Use POST /api/v1/statuses with a stable Idempotency-Key per post, a lease and accepted/failed/unknown states. Files: `features/publish_and_reconcile.py`, `templates/publish_and_reconcile.html` 2. Persist the returned remote id and link only after acknowledgement; bound retries and reconcile uncertain outcomes before a delayed replay. Persist the returned remote id and link only after acknowledgement; bound retries and reconcile uncertain outcomes before a delayed replay. Files: `features/publish_and_reconcile.py` 3. Exercise the acceptance fixture Use Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Check: Replaying an acknowledged post never makes a second API call. Then check: The simulated timeout becomes unknown and stays visible for review. Add a focused regression for the failure case under test/ using a temporary database or folder and fake external services; also perform the visible workflow in a browser. Files: `test/test_publish_and_reconcile.py` ```sh python -m unittest discover -s test ``` ### Done when - [ ] Replaying an acknowledged post never makes a second API call. - [ ] The simulated timeout becomes unknown and stays visible for review. ### Watch out - An idempotency key is not a permanent exactly-once guarantee; do not blindly retry after long outages. ## Phase 5 · Portable delivery and clean-start proof Finish the Buffer replacement with a documented first-run path and a recoverable export. ### Steps 1. Write the user-facing runbook Document prerequisites, every configuration variable, data locations and the three domain workflows: Account preflight and composer; Timezone slots; Publish and reconcile. Include the exclusions, actual costs and source check date 2026-09-05. Commands shown earlier that reference project files are files the builder must implement before running them. Files: `README.md`, `.env.example` 2. Create and rehearse a recoverable backup Use sqlite3.Connection.backup for the database in DATA_DIR and pause writers while taking the matching attachment snapshot. Keep schema version, hashes and a manifest for buffer. Restore into a separate empty directory or isolated deployment, with all outbound actions and schedules disabled. Recreate this proof: Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Compare ids/counts and open the result before recording the restore date. Never test a restore over the only live copy. Files: `OPERATIONS.md`, `scripts/backup.py` 3. Reproduce the first-run experience Use a new folder and only README instructions to reach the fixture outcome. Install from requirements.txt, initialize storage, run the tests and exercise the UI at 375px and 1280px; use keyboard-only controls and inspect browser errors. Record exactly what passed; do not mark unrun checks complete. Files: `README.md`, `verification.md` ```sh python -m pip install -r requirements.txt python -m unittest discover -s test ``` ### Done when - [ ] A new folder reaches the documented fixture outcome using only README instructions. - [ ] A backup restored in isolation preserves the proof data and can be opened. ### Watch out - Export without an import or restore rehearsal is not verified portability. ## Not in this build - An idempotency key is not a permanent exactly-once guarantee; do not blindly retry after long outages. - This is a text-only Mastodon posting queue with visible uncertain outcomes; full Buffer feature parity, vendor hosting and support are not included. - multi-network API maintenance - post previews - analytics - approvals - mobile apps - team queues - platform policy changes ## After v1, if you want it - Extend publish and reconcile only after the fixture and recovery checks pass. - Before adding another integration, document its credentials, limits, cost and failure behavior with primary-source links. ===== .env.example ===== # Copy to .env and fill in. Never commit .env; this file documents it. # Required. A new private folder this application creates on first run; never serve it as static files. DATA_DIR=./data/buffer # Required · secret. Generate with python -c "import secrets; print(secrets.token_hex(32))" and save only in .env. SECRET_KEY=replace-with-a-random-secret # Required. Use indie for loopback-only personal work. Product mode must refuse to start until owner login and the deployment gates are configured. APP_MODE=indie # Required. The origin used for local forms and links; replace with the chosen HTTPS origin in product mode. SITE_URL=http://127.0.0.1:5000 # Required. Your actual instance origin, validated and allowlisted by the owner. MASTODON_URL=https://your-instance.example # Required · secret. The access token created in your own instance Development settings. MASTODON_TOKEN=replace-with-scoped-token
You are building a production product version of Buffer. Create the following project files first, then implement the application by following them. Keep the files updated as decisions change. Do not collapse this into a single README or prompt. ===== PRODUCT.md ===== # Buffer · product brief ## Problem Posting to one or two APIs is easy, but maintaining social platform auth, queues, previews, analytics, and API-policy compliance is real ongoing work. ## Product outcome An operated version of a text-only Mastodon posting queue with visible uncertain outcomes, with authorized access, restore evidence and honest scope limits. ## Target user A builder who needs a maintainable product foundation, not a one-off demo. ## Required capabilities - OAuth/API access for each social network - hosted scheduler - database - media storage - retry/logging ## Explicit non-goals for v1 - An idempotency key is not a permanent exactly-once guarantee; do not blindly retry after long outages. - This is a text-only Mastodon posting queue with visible uncertain outcomes; full Buffer feature parity, vendor hosting and support are not included. - multi-network API maintenance - post previews - analytics - approvals - mobile apps - team queues - platform policy changes ## Success criteria - A revoked token fails preflight without modifying the queue. - Two posts fill successive free slots without sharing one slot. - Replaying an acknowledged post never makes a second API call. - A private-data authorization check passes using a second identity. - An off-host restore drill has a date, observed result and recovery time in OPERATIONS.md. - README names the excluded vendor capabilities and actual provider/hosting costs. ===== BRIEF.md ===== # Build brief · Buffer The one-shot brief this plan expands. `BUILD_PLAN.md` (or `MILESTONES.md`) is the same sequence broken into steps and checks; where the two disagree, the plan wins. Build me a text-only Mastodon posting queue with visible uncertain outcomes as a bounded replacement for Buffer. Build it in phases in the order below. Do not write the whole product in one pass. Finish the current phase, run its Done when checks, fix failures, then continue. Indie mode completes Phases 1-5. Phase 6 is required before shared or public deployment. ### Stack (fixed, do not substitute) - Runtime: Python 3.12+ and Flask. A small local HTTP application with readable server-side handlers and no JavaScript build pipeline. - Storage: SQLite through Python sqlite3. Local ownership with explicit transactions and a portable backup path. - Interface: Jinja HTML templates, CSS and vanilla JavaScript. Implement the specified screens directly with labelled controls and progressive enhancement. - Verification: Python unittest and browser acceptance fixtures. Check invariants and the actual user workflow before the next phase. ### Data model (create this before Phase 1) - posts(id,text,scheduled_utc,timezone,state,revision) - attempts(id,post_id,idempotency_key,started_at,outcome,remote_id,error) - slots(id,weekday,local_time) - account(id,instance_url) - Use stable ids and explicit relationships; add auxiliary tables named by the phases before those phases use them. - Acceptance fixture: Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. ### Prerequisites and configuration - Python 3.12 or newer and a terminal: Install Python from python.org. Open a terminal in a new empty project folder. On Windows, use py -3 where this guide says python if python is not on PATH; on macOS/Linux use python3 if needed. Create .venv and activate it before installing packages. Verify: python --version reports 3.12+ and python -c "import sqlite3" succeeds. Cost: Python is free; this local prototype requires no hosting subscription. - A current desktop browser and text editor: Use an installed Chrome, Firefox or Edge browser. Open the empty project folder in your editor; open the terminal there, not in this catalog repository. Verify: You can create a text file in the project folder and open browser developer tools. Cost: No paid service required for this local step. - Buffer acceptance sample: Create synthetic sample data before implementation: Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Save it under fixtures/ with the expected results in fixtures/README.md; use no real credentials or customer records. Verify: The fixture files and expected outcomes exist and can be inspected without a vendor account. Cost: No paid service required for this local step. - Confirm the bounded replacement: The deliverable is a text-only Mastodon posting queue with visible uncertain outcomes. Read every exclusion below. Indie mode runs locally; any public or shared use requires the product access and deployment gates first. Verify: You can name the primary workflow and the vendor features this version deliberately leaves out. Cost: No paid service required for this local step. - A token for your own Mastodon account: Open your instance preferences, Development, New application. Create an app with the minimal account verification and status-write permissions required by its API; copy its access token to .env. Use a test account and revoke the token when finished. Verify: The backend verifies the token identity without creating a post. Cost: Instance membership and usage conditions vary; check your instance before sending. - Configuration: DATA_DIR, SECRET_KEY, APP_MODE, SITE_URL, MASTODON_URL, MASTODON_TOKEN. Ship .env.example, replace placeholders and exclude secrets from git. ### Phase 1 · Local foundation and data contract Build: Create the runnable local foundation for a text-only Mastodon posting queue with visible uncertain outcomes, including the real schema and acceptance fixture. - Run the venv command first, then stop and activate it before running the remaining commands. Use your OS instructions: Windows .venv\Scripts\activate.bat in cmd, or .venv\Scripts\Activate.ps1 in PowerShell; macOS/Linux source .venv/bin/activate. Then install the listed packages. Create app.py exposing app, load .env with python-dotenv, and add a /healthz route. Freeze tested dependency versions to requirements.txt. Create .env manually from .env.example; replace SECRET_KEY before launch. Commands, after creating the named files: `python -m venv .venv`; `python -m pip install Flask Flask-WTF python-dotenv waitress tzdata`; `python -m pip freeze > requirements.txt`; `python -m flask --app app run --host 127.0.0.1`. - For database-backed state create schema.sql and db.py using this model: posts(id,text,scheduled_utc,timezone,state,revision); attempts(id,post_id,idempotency_key,started_at,outcome,remote_id,error); slots(id,weekday,local_time); account(id,instance_url). Add the auxiliary relationships explicitly used in later phases; use stable ids, foreign keys, parameterized values and transactions. For canonical files use atomic replacement and hashes instead. Implement python manage.py init and python manage.py seed to create only synthetic data: Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Re-running init must not erase data. Commands, after creating the named files: `python manage.py init`; `python manage.py seed`. - Install Flask-WTF CSRF protection for forms and same-origin fetches, validate Host and Origin against SITE_URL, bound inputs and escape output. Deliberately public intake endpoints get bounded validation and rate limits; signed provider webhooks use signature checks instead of browser CSRF tokens. All other admin routes stay local until product authentication exists. When a later phase tests viewer/member permissions, implement the users, hashed passwords, expiring server sessions and role checks in this foundation first; product mode must never use a fabricated identity from request input. Add error, empty, keyboard-focus and retry states now. - Trap: The Flask development server is for local development only. Loopback binding alone does not replace CSRF and origin validation. Done when: The documented start command serves /healthz and the initial screen at http://127.0.0.1:5000. Restarting preserves the seeded records or canonical files; running init again deletes nothing. A cross-origin state-changing request to an admin route is refused. Do not build yet: Do not start account preflight and composer until these checks pass. ### Phase 2 · Account preflight and composer Build: Account preflight and composer for Buffer: Connect one user-owned Mastodon account with a narrowly scoped token kept on the backend; verify the account before scheduling. - Connect one user-owned Mastodon account with a narrowly scoped token kept on the backend; verify the account before scheduling. - Build a plain-text composer using the instance reported limits and a local validation error when text is too long. - Use Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Check: A revoked token fails preflight without modifying the queue. Then check: A draft remains editable and is not sent during account verification. Add a focused regression for the failure case under test/ using a temporary database or folder and fake external services; also perform the visible workflow in a browser. Commands, after creating the named files: `python -m unittest discover -s test`. - Trap: Instances can differ; do not hardcode a universal character limit or API price. Done when: A revoked token fails preflight without modifying the queue. A draft remains editable and is not sent during account verification. Do not build yet: Do not start timezone slots until these checks pass. ### Phase 3 · Timezone slots Build: Timezone slots for Buffer: Create weekday/local-time slot rules and materialize upcoming slots into UTC with an explicit policy for missing or repeated DST times. - Create weekday/local-time slot rules and materialize upcoming slots into UTC with an explicit policy for missing or repeated DST times. - Support an exact scheduled time override and revision-safe rescheduling; show both local time and UTC in the queue. - Use Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Check: Two posts fill successive free slots without sharing one slot. Then check: The DST fixture creates no duplicate occurrence and displays the chosen policy. Add a focused regression for the failure case under test/ using a temporary database or folder and fake external services; also perform the visible workflow in a browser. Commands, after creating the named files: `python -m unittest discover -s test`. - Trap: A local time string alone cannot uniquely identify an instant around a clock change. Done when: Two posts fill successive free slots without sharing one slot. The DST fixture creates no duplicate occurrence and displays the chosen policy. Do not build yet: Do not start publish and reconcile until these checks pass. ### Phase 4 · Publish and reconcile Build: Publish and reconcile for Buffer: Use POST /api/v1/statuses with a stable Idempotency-Key per post, a lease and accepted/failed/unknown states. - Use POST /api/v1/statuses with a stable Idempotency-Key per post, a lease and accepted/failed/unknown states. - Persist the returned remote id and link only after acknowledgement; bound retries and reconcile uncertain outcomes before a delayed replay. - Use Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Check: Replaying an acknowledged post never makes a second API call. Then check: The simulated timeout becomes unknown and stays visible for review. Add a focused regression for the failure case under test/ using a temporary database or folder and fake external services; also perform the visible workflow in a browser. Commands, after creating the named files: `python -m unittest discover -s test`. - Trap: An idempotency key is not a permanent exactly-once guarantee; do not blindly retry after long outages. Done when: Replaying an acknowledged post never makes a second API call. The simulated timeout becomes unknown and stays visible for review. Do not build yet: Do not start portable delivery and clean-start proof until these checks pass. ### Phase 5 · Portable delivery and clean-start proof Build: Finish the Buffer replacement with a documented first-run path and a recoverable export. - Document prerequisites, every configuration variable, data locations and the three domain workflows: Account preflight and composer; Timezone slots; Publish and reconcile. Include the exclusions, actual costs and source check date 2026-09-05. Commands shown earlier that reference project files are files the builder must implement before running them. - Use sqlite3.Connection.backup for the database in DATA_DIR and pause writers while taking the matching attachment snapshot. Keep schema version, hashes and a manifest for buffer. Restore into a separate empty directory or isolated deployment, with all outbound actions and schedules disabled. Recreate this proof: Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Compare ids/counts and open the result before recording the restore date. Never test a restore over the only live copy. - Use a new folder and only README instructions to reach the fixture outcome. Install from requirements.txt, initialize storage, run the tests and exercise the UI at 375px and 1280px; use keyboard-only controls and inspect browser errors. Record exactly what passed; do not mark unrun checks complete. Commands, after creating the named files: `python -m pip install -r requirements.txt`; `python -m unittest discover -s test`. - Trap: Export without an import or restore rehearsal is not verified portability. Done when: A new folder reaches the documented fixture outcome using only README instructions. A backup restored in isolation preserves the proof data and can be opened. Do not build yet: Do not start operate and share with access controls until these checks pass. ### Phase 6 · Operate and share with access controls (product-builder only) Build: Product-builder only: make a text-only Mastodon posting queue with visible uncertain outcomes operable for its stated audience before allowing remote access. - Add owner/member/viewer authorization as appropriate, password hashes through Werkzeug, expiring server-side sessions, CSRF and login rate limits. Add users, sessions and audit schema migrations plus an owner-init command prompting securely for its password. Enforce ownership on every private read/write/download and fail closed when product setup is incomplete. Existing learner or admin identities must use this same boundary. - Serve app:app with Waitress on loopback behind Caddy HTTPS. Configure trusted proxy headers narrowly, Secure/HttpOnly/SameSite cookies, upload limits, request ids and structured logs without private content. Run background jobs as a separate supervised process when the domain workflow requires them. Commands, after creating the named files: `waitress-serve --listen=127.0.0.1:5000 app:app`. - Add a scheduled encrypted off-host backup using this procedure: Use sqlite3.Connection.backup for the database in DATA_DIR and pause writers while taking the matching attachment snapshot. Keep schema version, hashes and a manifest for buffer. Monitor health, disk space, failed jobs and backup age. Stop the service to test an alert; rehearse recovery with outbound effects disabled and record recovery time. Rotate any exposed credentials and require reconciliation before resuming queues. - Trap: Product mode is additional engineering, not a switch that makes a local prototype production-ready. Done when: An unauthenticated visitor cannot read private records, download private files or mutate the admin surface. A viewer cannot mutate data by making a direct request, and guessed ids cannot cross ownership boundaries. Stopping the service triggers the configured alert and the latest off-host backup restores the fixture in isolation. Do not build yet: Do not add new providers or vendor-scale features until the release gates are recorded. ### Out of scope (and why) - An idempotency key is not a permanent exactly-once guarantee; do not blindly retry after long outages. - This is a text-only Mastodon posting queue with visible uncertain outcomes; full Buffer feature parity, vendor hosting and support are not included. - multi-network API maintenance: retain the paid product if this capability is essential; it is outside this bounded build. - post previews: retain the paid product if this capability is essential; it is outside this bounded build. - analytics: retain the paid product if this capability is essential; it is outside this bounded build. - approvals: retain the paid product if this capability is essential; it is outside this bounded build. - mobile apps: retain the paid product if this capability is essential; it is outside this bounded build. - team queues: retain the paid product if this capability is essential; it is outside this bounded build. - platform policy changes: retain the paid product if this capability is essential; it is outside this bounded build. ### README must contain - Exact install, configure, initialize, start, test and recovery commands for a clean folder. - The schema, fixture, acceptance results, private data locations and export format. - Every prerequisite and secret source, actual running costs and deliberately excluded capabilities. - An honest distinction between tests actually run and checks still awaiting real credentials or deployment. - Dependency documentation reviewed 2026-09-05: https://flask.palletsprojects.com/en/stable/installation/ ; https://docs.python.org/3/library/sqlite3.html ; https://flask-wtf.readthedocs.io/en/1.2.x/csrf/ ; https://docs.pylonsproject.org/projects/waitress/en/stable/usage.html ; https://docs.joinmastodon.org/methods/statuses/ ; https://docs.joinmastodon.org/client/token/. Recheck before upgrading; freeze the versions actually tested. ===== ARCHITECTURE.md ===== # Architecture · Buffer ## Stack | Part | Choice | Why | | --- | --- | --- | | Runtime | Python 3.12+ and Flask | A small local HTTP application with readable server-side handlers and no JavaScript build pipeline. | | Storage | SQLite through Python sqlite3 | Local ownership with explicit transactions and a portable backup path. | | Interface | Jinja HTML templates, CSS and vanilla JavaScript | Implement the specified screens directly with labelled controls and progressive enhancement. | | Verification | Python unittest and browser acceptance fixtures | Check invariants and the actual user workflow before the next phase. | ## Modules Each module has one owner concern and a documented way to replace it. | Module | Owns | How to replace it | | --- | --- | --- | | Data and identity | posts(id,text,scheduled_utc,timezone,state,revision); attempts(id,post_id,idempotency_key,started_at,outcome,remote_id,error); slots(id,weekday,local_time); account(id,instance_url) | Keep stable ids and a versioned repository interface; migrate storage behind it with a fixture round-trip. | | Account preflight and composer | Connect one user-owned Mastodon account with a narrowly scoped token kept on the backend; verify the account before scheduling. | Keep the acceptance contract: A revoked token fails preflight without modifying the queue. Replace only this module after replaying its fixture; preserve ids and existing records. | | Timezone slots | Create weekday/local-time slot rules and materialize upcoming slots into UTC with an explicit policy for missing or repeated DST times. | Keep the acceptance contract: Two posts fill successive free slots without sharing one slot. Replace only this module after replaying its fixture; preserve ids and existing records. | | Publish and reconcile | Use POST /api/v1/statuses with a stable Idempotency-Key per post, a lease and accepted/failed/unknown states. | Keep the acceptance contract: Replaying an acknowledged post never makes a second API call. Replace only this module after replaying its fixture; preserve ids and existing records. | | Operations | Use sqlite3.Connection.backup for the database in DATA_DIR and pause writers while taking the matching attachment snapshot. Keep schema version, hashes and a manifest for buffer. | Change host or backup destination only after an isolated restore and authorization check. | ## Configuration Every runtime setting is an environment variable documented in `.env.example`, validated at startup, with a safe local default wherever one exists. - `DATA_DIR` · required · A new private folder this application creates on first run; never serve it as static files. - `SECRET_KEY` · required, secret · Generate with python -c "import secrets; print(secrets.token_hex(32))" and save only in .env. - `APP_MODE` · required · Use indie for loopback-only personal work. Product mode must refuse to start until owner login and the deployment gates are configured. - `SITE_URL` · required · The origin used for local forms and links; replace with the chosen HTTPS origin in product mode. - `MASTODON_URL` · required · Your actual instance origin, validated and allowlisted by the owner. - `MASTODON_TOKEN` · required, secret · The access token created in your own instance Development settings. ## Production baseline - Security: least privilege, input validation at every boundary, secret redaction in logs, rate limits on abuse-prone paths, no invented security primitives. - Data: explicit schema and migrations, transactional writes where integrity matters, backup and restore procedures that have been exercised. - Integrations: adapters around third-party providers, idempotent webhook or job processing, bounded retries, timeouts. - Observability: structured logs with request or operation ids, an error-tracking hook, and health and readiness checks where a server exists. - Quality: unit tests for domain rules, integration tests at module boundaries, one end-to-end test of the critical path. ## Decision records For each dependency in the stack table, keep a short note: why it was chosen, its failure mode, and how it is replaced. Do not add infrastructure until a requirement in `PRODUCT.md` justifies it. ===== AGENTS.md ===== # Agent instructions · Buffer product build - Read `PRODUCT.md` and `ARCHITECTURE.md` before changing code. The stack is fixed: Python 3.12+ and Flask, SQLite through Python sqlite3, Jinja HTML templates, CSS and vanilla JavaScript, Python unittest and browser acceptance fixtures. - Implement milestone by milestone from `MILESTONES.md`; keep each change reviewable and leave the application runnable at every commit. - Treat authentication, payments, encryption, imports, webhooks and destructive actions as high-risk boundaries when present. - Never invent cryptography or silently weaken a requirement to make a check pass. - Put every external service behind an interface with a deterministic fake for tests. - Add migrations and rollback or recovery notes for every persistent data change. - Log useful operational context without credentials, tokens, passwords or personal data. - Update documentation and run every check before completing a milestone. ## Known traps - The Flask development server is for local development only. Loopback binding alone does not replace CSRF and origin validation. - Instances can differ; do not hardcode a universal character limit or API price. - A local time string alone cannot uniquely identify an instant around a clock change. - An idempotency key is not a permanent exactly-once guarantee; do not blindly retry after long outages. - Export without an import or restore rehearsal is not verified portability. - Product mode is additional engineering, not a switch that makes a local prototype production-ready. ===== MILESTONES.md ===== # Delivery milestones · Buffer Estimated effort: **multi-day** for the indie phases; the production-only milestones add the trust and operability layer. ## M1 · Local foundation and data contract Create the runnable local foundation for a text-only Mastodon posting queue with visible uncertain outcomes, including the real schema and acceptance fixture. ### Steps 1. Create and start the local application Run the venv command first, then stop and activate it before running the remaining commands. Use your OS instructions: Windows .venv\Scripts\activate.bat in cmd, or .venv\Scripts\Activate.ps1 in PowerShell; macOS/Linux source .venv/bin/activate. Then install the listed packages. Create app.py exposing app, load .env with python-dotenv, and add a /healthz route. Freeze tested dependency versions to requirements.txt. Create .env manually from .env.example; replace SECRET_KEY before launch. Files: `app.py`, `requirements.txt`, `.env.example`, `.gitignore` ```sh python -m venv .venv python -m pip install Flask Flask-WTF python-dotenv waitress tzdata python -m pip freeze > requirements.txt python -m flask --app app run --host 127.0.0.1 ``` 2. Implement storage and seed the named fixture For database-backed state create schema.sql and db.py using this model: posts(id,text,scheduled_utc,timezone,state,revision); attempts(id,post_id,idempotency_key,started_at,outcome,remote_id,error); slots(id,weekday,local_time); account(id,instance_url). Add the auxiliary relationships explicitly used in later phases; use stable ids, foreign keys, parameterized values and transactions. For canonical files use atomic replacement and hashes instead. Implement python manage.py init and python manage.py seed to create only synthetic data: Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Re-running init must not erase data. Files: `schema.sql`, `db.py`, `manage.py`, `fixtures/README.md` ```sh python manage.py init python manage.py seed ``` 3. Protect the local request boundary Install Flask-WTF CSRF protection for forms and same-origin fetches, validate Host and Origin against SITE_URL, bound inputs and escape output. Deliberately public intake endpoints get bounded validation and rate limits; signed provider webhooks use signature checks instead of browser CSRF tokens. All other admin routes stay local until product authentication exists. When a later phase tests viewer/member permissions, implement the users, hashed passwords, expiring server sessions and role checks in this foundation first; product mode must never use a fabricated identity from request input. Add error, empty, keyboard-focus and retry states now. Files: `app.py`, `templates/base.html`, `test/test_foundation.py` ### Done when - [ ] The documented start command serves /healthz and the initial screen at http://127.0.0.1:5000. - [ ] Restarting preserves the seeded records or canonical files; running init again deletes nothing. - [ ] A cross-origin state-changing request to an admin route is refused. ### Watch out - The Flask development server is for local development only. Loopback binding alone does not replace CSRF and origin validation. ## M2 · Account preflight and composer Account preflight and composer for Buffer: Connect one user-owned Mastodon account with a narrowly scoped token kept on the backend; verify the account before scheduling. ### Steps 1. Connect one user-owned Mastodon account with a narrowly scoped token kept on the backend; verify the account before scheduling. Connect one user-owned Mastodon account with a narrowly scoped token kept on the backend; verify the account before scheduling. Files: `features/account_preflight_and_composer.py`, `templates/account_preflight_and_composer.html` 2. Build a plain-text composer using the instance reported limits and a local validation error when text is too long. Build a plain-text composer using the instance reported limits and a local validation error when text is too long. Files: `features/account_preflight_and_composer.py` 3. Exercise the acceptance fixture Use Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Check: A revoked token fails preflight without modifying the queue. Then check: A draft remains editable and is not sent during account verification. Add a focused regression for the failure case under test/ using a temporary database or folder and fake external services; also perform the visible workflow in a browser. Files: `test/test_account_preflight_and_composer.py` ```sh python -m unittest discover -s test ``` ### Done when - [ ] A revoked token fails preflight without modifying the queue. - [ ] A draft remains editable and is not sent during account verification. ### Watch out - Instances can differ; do not hardcode a universal character limit or API price. ## M3 · Timezone slots Timezone slots for Buffer: Create weekday/local-time slot rules and materialize upcoming slots into UTC with an explicit policy for missing or repeated DST times. ### Steps 1. Create weekday/local-time slot rules and materialize upcoming slots into UTC with an explicit policy for missing or repeated DST times. Create weekday/local-time slot rules and materialize upcoming slots into UTC with an explicit policy for missing or repeated DST times. Files: `features/timezone_slots.py`, `templates/timezone_slots.html` 2. Support an exact scheduled time override and revision-safe rescheduling; show both local time and UTC in the queue. Support an exact scheduled time override and revision-safe rescheduling; show both local time and UTC in the queue. Files: `features/timezone_slots.py` 3. Exercise the acceptance fixture Use Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Check: Two posts fill successive free slots without sharing one slot. Then check: The DST fixture creates no duplicate occurrence and displays the chosen policy. Add a focused regression for the failure case under test/ using a temporary database or folder and fake external services; also perform the visible workflow in a browser. Files: `test/test_timezone_slots.py` ```sh python -m unittest discover -s test ``` ### Done when - [ ] Two posts fill successive free slots without sharing one slot. - [ ] The DST fixture creates no duplicate occurrence and displays the chosen policy. ### Watch out - A local time string alone cannot uniquely identify an instant around a clock change. ## M4 · Publish and reconcile Publish and reconcile for Buffer: Use POST /api/v1/statuses with a stable Idempotency-Key per post, a lease and accepted/failed/unknown states. ### Steps 1. Use POST /api/v1/statuses with a stable Idempotency-Key per post, a lease and accepted/failed/unknown states. Use POST /api/v1/statuses with a stable Idempotency-Key per post, a lease and accepted/failed/unknown states. Files: `features/publish_and_reconcile.py`, `templates/publish_and_reconcile.html` 2. Persist the returned remote id and link only after acknowledgement; bound retries and reconcile uncertain outcomes before a delayed replay. Persist the returned remote id and link only after acknowledgement; bound retries and reconcile uncertain outcomes before a delayed replay. Files: `features/publish_and_reconcile.py` 3. Exercise the acceptance fixture Use Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Check: Replaying an acknowledged post never makes a second API call. Then check: The simulated timeout becomes unknown and stays visible for review. Add a focused regression for the failure case under test/ using a temporary database or folder and fake external services; also perform the visible workflow in a browser. Files: `test/test_publish_and_reconcile.py` ```sh python -m unittest discover -s test ``` ### Done when - [ ] Replaying an acknowledged post never makes a second API call. - [ ] The simulated timeout becomes unknown and stays visible for review. ### Watch out - An idempotency key is not a permanent exactly-once guarantee; do not blindly retry after long outages. ## M5 · Portable delivery and clean-start proof Finish the Buffer replacement with a documented first-run path and a recoverable export. ### Steps 1. Write the user-facing runbook Document prerequisites, every configuration variable, data locations and the three domain workflows: Account preflight and composer; Timezone slots; Publish and reconcile. Include the exclusions, actual costs and source check date 2026-09-05. Commands shown earlier that reference project files are files the builder must implement before running them. Files: `README.md`, `.env.example` 2. Create and rehearse a recoverable backup Use sqlite3.Connection.backup for the database in DATA_DIR and pause writers while taking the matching attachment snapshot. Keep schema version, hashes and a manifest for buffer. Restore into a separate empty directory or isolated deployment, with all outbound actions and schedules disabled. Recreate this proof: Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Compare ids/counts and open the result before recording the restore date. Never test a restore over the only live copy. Files: `OPERATIONS.md`, `scripts/backup.py` 3. Reproduce the first-run experience Use a new folder and only README instructions to reach the fixture outcome. Install from requirements.txt, initialize storage, run the tests and exercise the UI at 375px and 1280px; use keyboard-only controls and inspect browser errors. Record exactly what passed; do not mark unrun checks complete. Files: `README.md`, `verification.md` ```sh python -m pip install -r requirements.txt python -m unittest discover -s test ``` ### Done when - [ ] A new folder reaches the documented fixture outcome using only README instructions. - [ ] A backup restored in isolation preserves the proof data and can be opened. ### Watch out - Export without an import or restore rehearsal is not verified portability. ## M6 · Operate and share with access controls (production only) Product-builder only: make a text-only Mastodon posting queue with visible uncertain outcomes operable for its stated audience before allowing remote access. ### Steps 1. Establish owner access before exposure Add owner/member/viewer authorization as appropriate, password hashes through Werkzeug, expiring server-side sessions, CSRF and login rate limits. Add users, sessions and audit schema migrations plus an owner-init command prompting securely for its password. Enforce ownership on every private read/write/download and fail closed when product setup is incomplete. Existing learner or admin identities must use this same boundary. Files: `ARCHITECTURE.md`, `OPERATIONS.md` 2. Deploy a monitored service Serve app:app with Waitress on loopback behind Caddy HTTPS. Configure trusted proxy headers narrowly, Secure/HttpOnly/SameSite cookies, upload limits, request ids and structured logs without private content. Run background jobs as a separate supervised process when the domain workflow requires them. Files: `Caddyfile`, `OPERATIONS.md` ```sh waitress-serve --listen=127.0.0.1:5000 app:app ``` 3. Rehearse loss and recovery Add a scheduled encrypted off-host backup using this procedure: Use sqlite3.Connection.backup for the database in DATA_DIR and pause writers while taking the matching attachment snapshot. Keep schema version, hashes and a manifest for buffer. Monitor health, disk space, failed jobs and backup age. Stop the service to test an alert; rehearse recovery with outbound effects disabled and record recovery time. Rotate any exposed credentials and require reconciliation before resuming queues. Files: `OPERATIONS.md`, `release-checklist.md` ### Done when - [ ] An unauthenticated visitor cannot read private records, download private files or mutate the admin surface. - [ ] A viewer cannot mutate data by making a direct request, and guessed ids cannot cross ownership boundaries. - [ ] Stopping the service triggers the configured alert and the latest off-host backup restores the fixture in isolation. ### Watch out - Product mode is additional engineering, not a switch that makes a local prototype production-ready. ===== OPERATIONS.md ===== # Operations · Buffer ## Backup Use sqlite3.Connection.backup for the database in DATA_DIR and pause writers while taking the matching attachment snapshot. Keep schema version, hashes and a manifest for buffer. ## Restore Restore into a separate empty directory or isolated deployment, with all outbound actions and schedules disabled. Recreate this proof: Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Compare ids/counts and open the result before recording the restore date. Never test a restore over the only live copy. Do a restore drill before the first real user, and write the date here when it passes. ## Monitoring Check HTTP availability, free disk, backup age and domain failures for Account preflight and composer, Timezone slots, Publish and reconcile. Alert without logging private payloads. ## Incident checklist Pause outbound jobs and public intake as appropriate, preserve redacted diagnostics, restore an isolated verified backup, rotate affected credentials and reconcile uncertain effects before reopening. 1. Contain the issue without destroying evidence or user data. 2. Record the timeline and affected scope. 3. Rotate exposed secrets and revoke compromised sessions or credentials. 4. Restore from a verified backup when needed. 5. Document the root cause, the remediation and the regression test. ## Release gate - [ ] A revoked token fails preflight without modifying the queue. - [ ] Two posts fill successive free slots without sharing one slot. - [ ] Replaying an acknowledged post never makes a second API call. - [ ] A private-data authorization check passes using a second identity. - [ ] An off-host restore drill has a date, observed result and recovery time in OPERATIONS.md. - [ ] README names the excluded vendor capabilities and actual provider/hosting costs. ## Launch constraint Do not market omitted Buffer capabilities as implemented. The non-goals in `PRODUCT.md` remain user-visible limitations until they are deliberately delivered. ===== .env.example ===== # Copy to .env and fill in. Never commit .env; this file documents it. # Required. A new private folder this application creates on first run; never serve it as static files. DATA_DIR=./data/buffer # Required · secret. Generate with python -c "import secrets; print(secrets.token_hex(32))" and save only in .env. SECRET_KEY=replace-with-a-random-secret # Required. Use indie for loopback-only personal work. Product mode must refuse to start until owner login and the deployment gates are configured. APP_MODE=indie # Required. The origin used for local forms and links; replace with the chosen HTTPS origin in product mode. SITE_URL=http://127.0.0.1:5000 # Required. Your actual instance origin, validated and allowlisted by the owner. MASTODON_URL=https://your-instance.example # Required · secret. The access token created in your own instance Development settings. MASTODON_TOKEN=replace-with-scoped-token
README.md
# Buffer · indie build Build a text-only Mastodon posting queue with visible uncertain outcomes. Estimated effort: **multi-day**. Work `BUILD_PLAN.md` top to bottom · every phase ends in a check that has to pass before the next one starts. ## Stack | Part | Choice | Why | | --- | --- | --- | | Runtime | Python 3.12+ and Flask | A small local HTTP application with readable server-side handlers and no JavaScript build pipeline. | | Storage | SQLite through Python sqlite3 | Local ownership with explicit transactions and a portable backup path. | | Interface | Jinja HTML templates, CSS and vanilla JavaScript | Implement the specified screens directly with labelled controls and progressive enhancement. | | Verification | Python unittest and browser acceptance fixtures | Check invariants and the actual user workflow before the next phase. | ## Before you start Have every one of these ready. The plan assumes them from step one. - [ ] **Python 3.12 or newer and a terminal** · Python is free; this local prototype requires no hosting subscription. - Why: The local backend, tests and storage use Python. - Get it: Install Python from python.org. Open a terminal in a new empty project folder. On Windows, use py -3 where this guide says python if python is not on PATH; on macOS/Linux use python3 if needed. Create .venv and activate it before installing packages. - Verify: python --version reports 3.12+ and python -c "import sqlite3" succeeds. - [ ] **A current desktop browser and text editor** · No paid service required for this local step. - Why: You need to view the local interface and edit generated project files. - Get it: Use an installed Chrome, Firefox or Edge browser. Open the empty project folder in your editor; open the terminal there, not in this catalog repository. - Verify: You can create a text file in the project folder and open browser developer tools. - [ ] **Buffer acceptance sample** · No paid service required for this local step. - Why: This fixture makes the first end-to-end check reproducible. - Get it: Create synthetic sample data before implementation: Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Save it under fixtures/ with the expected results in fixtures/README.md; use no real credentials or customer records. - Verify: The fixture files and expected outcomes exist and can be inspected without a vendor account. - [ ] **Confirm the bounded replacement** · No paid service required for this local step. - Why: The full commercial product is larger than this guide. - Get it: The deliverable is a text-only Mastodon posting queue with visible uncertain outcomes. Read every exclusion below. Indie mode runs locally; any public or shared use requires the product access and deployment gates first. - Verify: You can name the primary workflow and the vendor features this version deliberately leaves out. - [ ] **A token for your own Mastodon account** · Instance membership and usage conditions vary; check your instance before sending. - Why: Publishing needs scoped permission on your instance. - Get it: Open your instance preferences, Development, New application. Create an app with the minimal account verification and status-write permissions required by its API; copy its access token to .env. Use a test account and revoke the token when finished. - Verify: The backend verifies the token identity without creating a post. ## Quick start ```sh python -m venv .venv python -m pip install Flask Flask-WTF python-dotenv waitress tzdata python -m pip freeze > requirements.txt python -m flask --app app run --host 127.0.0.1 ``` Then copy `.env.example` to `.env` and fill in the values it documents. ## Honest limits This build deliberately does not replace: - An idempotency key is not a permanent exactly-once guarantee; do not blindly retry after long outages. - This is a text-only Mastodon posting queue with visible uncertain outcomes; full Buffer feature parity, vendor hosting and support are not included. - multi-network API maintenance - post previews - analytics - approvals - mobile apps - team queues - platform policy changes If one of those is essential to you, that is the reason to keep paying for Buffer, and the README should say so rather than pretend.
BRIEF.md
# Build brief · Buffer The one-shot brief this plan expands. `BUILD_PLAN.md` (or `MILESTONES.md`) is the same sequence broken into steps and checks; where the two disagree, the plan wins. Build me a text-only Mastodon posting queue with visible uncertain outcomes as a bounded replacement for Buffer. Build it in phases in the order below. Do not write the whole product in one pass. Finish the current phase, run its Done when checks, fix failures, then continue. Indie mode completes Phases 1-5. Phase 6 is required before shared or public deployment. ### Stack (fixed, do not substitute) - Runtime: Python 3.12+ and Flask. A small local HTTP application with readable server-side handlers and no JavaScript build pipeline. - Storage: SQLite through Python sqlite3. Local ownership with explicit transactions and a portable backup path. - Interface: Jinja HTML templates, CSS and vanilla JavaScript. Implement the specified screens directly with labelled controls and progressive enhancement. - Verification: Python unittest and browser acceptance fixtures. Check invariants and the actual user workflow before the next phase. ### Data model (create this before Phase 1) - posts(id,text,scheduled_utc,timezone,state,revision) - attempts(id,post_id,idempotency_key,started_at,outcome,remote_id,error) - slots(id,weekday,local_time) - account(id,instance_url) - Use stable ids and explicit relationships; add auxiliary tables named by the phases before those phases use them. - Acceptance fixture: Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. ### Prerequisites and configuration - Python 3.12 or newer and a terminal: Install Python from python.org. Open a terminal in a new empty project folder. On Windows, use py -3 where this guide says python if python is not on PATH; on macOS/Linux use python3 if needed. Create .venv and activate it before installing packages. Verify: python --version reports 3.12+ and python -c "import sqlite3" succeeds. Cost: Python is free; this local prototype requires no hosting subscription. - A current desktop browser and text editor: Use an installed Chrome, Firefox or Edge browser. Open the empty project folder in your editor; open the terminal there, not in this catalog repository. Verify: You can create a text file in the project folder and open browser developer tools. Cost: No paid service required for this local step. - Buffer acceptance sample: Create synthetic sample data before implementation: Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Save it under fixtures/ with the expected results in fixtures/README.md; use no real credentials or customer records. Verify: The fixture files and expected outcomes exist and can be inspected without a vendor account. Cost: No paid service required for this local step. - Confirm the bounded replacement: The deliverable is a text-only Mastodon posting queue with visible uncertain outcomes. Read every exclusion below. Indie mode runs locally; any public or shared use requires the product access and deployment gates first. Verify: You can name the primary workflow and the vendor features this version deliberately leaves out. Cost: No paid service required for this local step. - A token for your own Mastodon account: Open your instance preferences, Development, New application. Create an app with the minimal account verification and status-write permissions required by its API; copy its access token to .env. Use a test account and revoke the token when finished. Verify: The backend verifies the token identity without creating a post. Cost: Instance membership and usage conditions vary; check your instance before sending. - Configuration: DATA_DIR, SECRET_KEY, APP_MODE, SITE_URL, MASTODON_URL, MASTODON_TOKEN. Ship .env.example, replace placeholders and exclude secrets from git. ### Phase 1 · Local foundation and data contract Build: Create the runnable local foundation for a text-only Mastodon posting queue with visible uncertain outcomes, including the real schema and acceptance fixture. - Run the venv command first, then stop and activate it before running the remaining commands. Use your OS instructions: Windows .venv\Scripts\activate.bat in cmd, or .venv\Scripts\Activate.ps1 in PowerShell; macOS/Linux source .venv/bin/activate. Then install the listed packages. Create app.py exposing app, load .env with python-dotenv, and add a /healthz route. Freeze tested dependency versions to requirements.txt. Create .env manually from .env.example; replace SECRET_KEY before launch. Commands, after creating the named files: `python -m venv .venv`; `python -m pip install Flask Flask-WTF python-dotenv waitress tzdata`; `python -m pip freeze > requirements.txt`; `python -m flask --app app run --host 127.0.0.1`. - For database-backed state create schema.sql and db.py using this model: posts(id,text,scheduled_utc,timezone,state,revision); attempts(id,post_id,idempotency_key,started_at,outcome,remote_id,error); slots(id,weekday,local_time); account(id,instance_url). Add the auxiliary relationships explicitly used in later phases; use stable ids, foreign keys, parameterized values and transactions. For canonical files use atomic replacement and hashes instead. Implement python manage.py init and python manage.py seed to create only synthetic data: Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Re-running init must not erase data. Commands, after creating the named files: `python manage.py init`; `python manage.py seed`. - Install Flask-WTF CSRF protection for forms and same-origin fetches, validate Host and Origin against SITE_URL, bound inputs and escape output. Deliberately public intake endpoints get bounded validation and rate limits; signed provider webhooks use signature checks instead of browser CSRF tokens. All other admin routes stay local until product authentication exists. When a later phase tests viewer/member permissions, implement the users, hashed passwords, expiring server sessions and role checks in this foundation first; product mode must never use a fabricated identity from request input. Add error, empty, keyboard-focus and retry states now. - Trap: The Flask development server is for local development only. Loopback binding alone does not replace CSRF and origin validation. Done when: The documented start command serves /healthz and the initial screen at http://127.0.0.1:5000. Restarting preserves the seeded records or canonical files; running init again deletes nothing. A cross-origin state-changing request to an admin route is refused. Do not build yet: Do not start account preflight and composer until these checks pass. ### Phase 2 · Account preflight and composer Build: Account preflight and composer for Buffer: Connect one user-owned Mastodon account with a narrowly scoped token kept on the backend; verify the account before scheduling. - Connect one user-owned Mastodon account with a narrowly scoped token kept on the backend; verify the account before scheduling. - Build a plain-text composer using the instance reported limits and a local validation error when text is too long. - Use Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Check: A revoked token fails preflight without modifying the queue. Then check: A draft remains editable and is not sent during account verification. Add a focused regression for the failure case under test/ using a temporary database or folder and fake external services; also perform the visible workflow in a browser. Commands, after creating the named files: `python -m unittest discover -s test`. - Trap: Instances can differ; do not hardcode a universal character limit or API price. Done when: A revoked token fails preflight without modifying the queue. A draft remains editable and is not sent during account verification. Do not build yet: Do not start timezone slots until these checks pass. ### Phase 3 · Timezone slots Build: Timezone slots for Buffer: Create weekday/local-time slot rules and materialize upcoming slots into UTC with an explicit policy for missing or repeated DST times. - Create weekday/local-time slot rules and materialize upcoming slots into UTC with an explicit policy for missing or repeated DST times. - Support an exact scheduled time override and revision-safe rescheduling; show both local time and UTC in the queue. - Use Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Check: Two posts fill successive free slots without sharing one slot. Then check: The DST fixture creates no duplicate occurrence and displays the chosen policy. Add a focused regression for the failure case under test/ using a temporary database or folder and fake external services; also perform the visible workflow in a browser. Commands, after creating the named files: `python -m unittest discover -s test`. - Trap: A local time string alone cannot uniquely identify an instant around a clock change. Done when: Two posts fill successive free slots without sharing one slot. The DST fixture creates no duplicate occurrence and displays the chosen policy. Do not build yet: Do not start publish and reconcile until these checks pass. ### Phase 4 · Publish and reconcile Build: Publish and reconcile for Buffer: Use POST /api/v1/statuses with a stable Idempotency-Key per post, a lease and accepted/failed/unknown states. - Use POST /api/v1/statuses with a stable Idempotency-Key per post, a lease and accepted/failed/unknown states. - Persist the returned remote id and link only after acknowledgement; bound retries and reconcile uncertain outcomes before a delayed replay. - Use Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Check: Replaying an acknowledged post never makes a second API call. Then check: The simulated timeout becomes unknown and stays visible for review. Add a focused regression for the failure case under test/ using a temporary database or folder and fake external services; also perform the visible workflow in a browser. Commands, after creating the named files: `python -m unittest discover -s test`. - Trap: An idempotency key is not a permanent exactly-once guarantee; do not blindly retry after long outages. Done when: Replaying an acknowledged post never makes a second API call. The simulated timeout becomes unknown and stays visible for review. Do not build yet: Do not start portable delivery and clean-start proof until these checks pass. ### Phase 5 · Portable delivery and clean-start proof Build: Finish the Buffer replacement with a documented first-run path and a recoverable export. - Document prerequisites, every configuration variable, data locations and the three domain workflows: Account preflight and composer; Timezone slots; Publish and reconcile. Include the exclusions, actual costs and source check date 2026-09-05. Commands shown earlier that reference project files are files the builder must implement before running them. - Use sqlite3.Connection.backup for the database in DATA_DIR and pause writers while taking the matching attachment snapshot. Keep schema version, hashes and a manifest for buffer. Restore into a separate empty directory or isolated deployment, with all outbound actions and schedules disabled. Recreate this proof: Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Compare ids/counts and open the result before recording the restore date. Never test a restore over the only live copy. - Use a new folder and only README instructions to reach the fixture outcome. Install from requirements.txt, initialize storage, run the tests and exercise the UI at 375px and 1280px; use keyboard-only controls and inspect browser errors. Record exactly what passed; do not mark unrun checks complete. Commands, after creating the named files: `python -m pip install -r requirements.txt`; `python -m unittest discover -s test`. - Trap: Export without an import or restore rehearsal is not verified portability. Done when: A new folder reaches the documented fixture outcome using only README instructions. A backup restored in isolation preserves the proof data and can be opened. Do not build yet: Do not start operate and share with access controls until these checks pass. ### Phase 6 · Operate and share with access controls (product-builder only) Build: Product-builder only: make a text-only Mastodon posting queue with visible uncertain outcomes operable for its stated audience before allowing remote access. - Add owner/member/viewer authorization as appropriate, password hashes through Werkzeug, expiring server-side sessions, CSRF and login rate limits. Add users, sessions and audit schema migrations plus an owner-init command prompting securely for its password. Enforce ownership on every private read/write/download and fail closed when product setup is incomplete. Existing learner or admin identities must use this same boundary. - Serve app:app with Waitress on loopback behind Caddy HTTPS. Configure trusted proxy headers narrowly, Secure/HttpOnly/SameSite cookies, upload limits, request ids and structured logs without private content. Run background jobs as a separate supervised process when the domain workflow requires them. Commands, after creating the named files: `waitress-serve --listen=127.0.0.1:5000 app:app`. - Add a scheduled encrypted off-host backup using this procedure: Use sqlite3.Connection.backup for the database in DATA_DIR and pause writers while taking the matching attachment snapshot. Keep schema version, hashes and a manifest for buffer. Monitor health, disk space, failed jobs and backup age. Stop the service to test an alert; rehearse recovery with outbound effects disabled and record recovery time. Rotate any exposed credentials and require reconciliation before resuming queues. - Trap: Product mode is additional engineering, not a switch that makes a local prototype production-ready. Done when: An unauthenticated visitor cannot read private records, download private files or mutate the admin surface. A viewer cannot mutate data by making a direct request, and guessed ids cannot cross ownership boundaries. Stopping the service triggers the configured alert and the latest off-host backup restores the fixture in isolation. Do not build yet: Do not add new providers or vendor-scale features until the release gates are recorded. ### Out of scope (and why) - An idempotency key is not a permanent exactly-once guarantee; do not blindly retry after long outages. - This is a text-only Mastodon posting queue with visible uncertain outcomes; full Buffer feature parity, vendor hosting and support are not included. - multi-network API maintenance: retain the paid product if this capability is essential; it is outside this bounded build. - post previews: retain the paid product if this capability is essential; it is outside this bounded build. - analytics: retain the paid product if this capability is essential; it is outside this bounded build. - approvals: retain the paid product if this capability is essential; it is outside this bounded build. - mobile apps: retain the paid product if this capability is essential; it is outside this bounded build. - team queues: retain the paid product if this capability is essential; it is outside this bounded build. - platform policy changes: retain the paid product if this capability is essential; it is outside this bounded build. ### README must contain - Exact install, configure, initialize, start, test and recovery commands for a clean folder. - The schema, fixture, acceptance results, private data locations and export format. - Every prerequisite and secret source, actual running costs and deliberately excluded capabilities. - An honest distinction between tests actually run and checks still awaiting real credentials or deployment. - Dependency documentation reviewed 2026-09-05: https://flask.palletsprojects.com/en/stable/installation/ ; https://docs.python.org/3/library/sqlite3.html ; https://flask-wtf.readthedocs.io/en/1.2.x/csrf/ ; https://docs.pylonsproject.org/projects/waitress/en/stable/usage.html ; https://docs.joinmastodon.org/methods/statuses/ ; https://docs.joinmastodon.org/client/token/. Recheck before upgrading; freeze the versions actually tested.
AGENTS.md
# Agent instructions · Buffer indie build - Read `README.md` and `BUILD_PLAN.md` before writing code. The stack is fixed: Python 3.12+ and Flask, SQLite through Python sqlite3, Jinja HTML templates, CSS and vanilla JavaScript, Python unittest and browser acceptance fixtures. Do not substitute. - Work one phase at a time, in order. Do not start a phase until every "Done when" item of the previous one passes. - Prefer the fewest moving parts that satisfy the step. No frameworks, services or dependencies the plan does not name. - Secrets live in `.env`, never in source or logs. Keep `.env.example` current when a variable is introduced. - Do not invent cryptography, security guarantees, APIs or compliance claims. - Add a focused test for every destructive, security-sensitive or data-loss path the plan names. - Run the project checks before declaring a phase complete, and record any deliberate shortcut in the README under "Tradeoffs". ## Known traps - The Flask development server is for local development only. Loopback binding alone does not replace CSRF and origin validation. - Instances can differ; do not hardcode a universal character limit or API price. - A local time string alone cannot uniquely identify an instant around a clock change. - An idempotency key is not a permanent exactly-once guarantee; do not blindly retry after long outages. - Export without an import or restore rehearsal is not verified portability.
BUILD_PLAN.md
# Build plan · Buffer Build a text-only Mastodon posting queue with visible uncertain outcomes. Phases are in dependency order. Each ends in a "Done when" list; treat an unticked item as a blocker, not a note. ## Phase 1 · Local foundation and data contract Create the runnable local foundation for a text-only Mastodon posting queue with visible uncertain outcomes, including the real schema and acceptance fixture. ### Steps 1. Create and start the local application Run the venv command first, then stop and activate it before running the remaining commands. Use your OS instructions: Windows .venv\Scripts\activate.bat in cmd, or .venv\Scripts\Activate.ps1 in PowerShell; macOS/Linux source .venv/bin/activate. Then install the listed packages. Create app.py exposing app, load .env with python-dotenv, and add a /healthz route. Freeze tested dependency versions to requirements.txt. Create .env manually from .env.example; replace SECRET_KEY before launch. Files: `app.py`, `requirements.txt`, `.env.example`, `.gitignore` ```sh python -m venv .venv python -m pip install Flask Flask-WTF python-dotenv waitress tzdata python -m pip freeze > requirements.txt python -m flask --app app run --host 127.0.0.1 ``` 2. Implement storage and seed the named fixture For database-backed state create schema.sql and db.py using this model: posts(id,text,scheduled_utc,timezone,state,revision); attempts(id,post_id,idempotency_key,started_at,outcome,remote_id,error); slots(id,weekday,local_time); account(id,instance_url). Add the auxiliary relationships explicitly used in later phases; use stable ids, foreign keys, parameterized values and transactions. For canonical files use atomic replacement and hashes instead. Implement python manage.py init and python manage.py seed to create only synthetic data: Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Re-running init must not erase data. Files: `schema.sql`, `db.py`, `manage.py`, `fixtures/README.md` ```sh python manage.py init python manage.py seed ``` 3. Protect the local request boundary Install Flask-WTF CSRF protection for forms and same-origin fetches, validate Host and Origin against SITE_URL, bound inputs and escape output. Deliberately public intake endpoints get bounded validation and rate limits; signed provider webhooks use signature checks instead of browser CSRF tokens. All other admin routes stay local until product authentication exists. When a later phase tests viewer/member permissions, implement the users, hashed passwords, expiring server sessions and role checks in this foundation first; product mode must never use a fabricated identity from request input. Add error, empty, keyboard-focus and retry states now. Files: `app.py`, `templates/base.html`, `test/test_foundation.py` ### Done when - [ ] The documented start command serves /healthz and the initial screen at http://127.0.0.1:5000. - [ ] Restarting preserves the seeded records or canonical files; running init again deletes nothing. - [ ] A cross-origin state-changing request to an admin route is refused. ### Watch out - The Flask development server is for local development only. Loopback binding alone does not replace CSRF and origin validation. ## Phase 2 · Account preflight and composer Account preflight and composer for Buffer: Connect one user-owned Mastodon account with a narrowly scoped token kept on the backend; verify the account before scheduling. ### Steps 1. Connect one user-owned Mastodon account with a narrowly scoped token kept on the backend; verify the account before scheduling. Connect one user-owned Mastodon account with a narrowly scoped token kept on the backend; verify the account before scheduling. Files: `features/account_preflight_and_composer.py`, `templates/account_preflight_and_composer.html` 2. Build a plain-text composer using the instance reported limits and a local validation error when text is too long. Build a plain-text composer using the instance reported limits and a local validation error when text is too long. Files: `features/account_preflight_and_composer.py` 3. Exercise the acceptance fixture Use Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Check: A revoked token fails preflight without modifying the queue. Then check: A draft remains editable and is not sent during account verification. Add a focused regression for the failure case under test/ using a temporary database or folder and fake external services; also perform the visible workflow in a browser. Files: `test/test_account_preflight_and_composer.py` ```sh python -m unittest discover -s test ``` ### Done when - [ ] A revoked token fails preflight without modifying the queue. - [ ] A draft remains editable and is not sent during account verification. ### Watch out - Instances can differ; do not hardcode a universal character limit or API price. ## Phase 3 · Timezone slots Timezone slots for Buffer: Create weekday/local-time slot rules and materialize upcoming slots into UTC with an explicit policy for missing or repeated DST times. ### Steps 1. Create weekday/local-time slot rules and materialize upcoming slots into UTC with an explicit policy for missing or repeated DST times. Create weekday/local-time slot rules and materialize upcoming slots into UTC with an explicit policy for missing or repeated DST times. Files: `features/timezone_slots.py`, `templates/timezone_slots.html` 2. Support an exact scheduled time override and revision-safe rescheduling; show both local time and UTC in the queue. Support an exact scheduled time override and revision-safe rescheduling; show both local time and UTC in the queue. Files: `features/timezone_slots.py` 3. Exercise the acceptance fixture Use Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Check: Two posts fill successive free slots without sharing one slot. Then check: The DST fixture creates no duplicate occurrence and displays the chosen policy. Add a focused regression for the failure case under test/ using a temporary database or folder and fake external services; also perform the visible workflow in a browser. Files: `test/test_timezone_slots.py` ```sh python -m unittest discover -s test ``` ### Done when - [ ] Two posts fill successive free slots without sharing one slot. - [ ] The DST fixture creates no duplicate occurrence and displays the chosen policy. ### Watch out - A local time string alone cannot uniquely identify an instant around a clock change. ## Phase 4 · Publish and reconcile Publish and reconcile for Buffer: Use POST /api/v1/statuses with a stable Idempotency-Key per post, a lease and accepted/failed/unknown states. ### Steps 1. Use POST /api/v1/statuses with a stable Idempotency-Key per post, a lease and accepted/failed/unknown states. Use POST /api/v1/statuses with a stable Idempotency-Key per post, a lease and accepted/failed/unknown states. Files: `features/publish_and_reconcile.py`, `templates/publish_and_reconcile.html` 2. Persist the returned remote id and link only after acknowledgement; bound retries and reconcile uncertain outcomes before a delayed replay. Persist the returned remote id and link only after acknowledgement; bound retries and reconcile uncertain outcomes before a delayed replay. Files: `features/publish_and_reconcile.py` 3. Exercise the acceptance fixture Use Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Check: Replaying an acknowledged post never makes a second API call. Then check: The simulated timeout becomes unknown and stays visible for review. Add a focused regression for the failure case under test/ using a temporary database or folder and fake external services; also perform the visible workflow in a browser. Files: `test/test_publish_and_reconcile.py` ```sh python -m unittest discover -s test ``` ### Done when - [ ] Replaying an acknowledged post never makes a second API call. - [ ] The simulated timeout becomes unknown and stays visible for review. ### Watch out - An idempotency key is not a permanent exactly-once guarantee; do not blindly retry after long outages. ## Phase 5 · Portable delivery and clean-start proof Finish the Buffer replacement with a documented first-run path and a recoverable export. ### Steps 1. Write the user-facing runbook Document prerequisites, every configuration variable, data locations and the three domain workflows: Account preflight and composer; Timezone slots; Publish and reconcile. Include the exclusions, actual costs and source check date 2026-09-05. Commands shown earlier that reference project files are files the builder must implement before running them. Files: `README.md`, `.env.example` 2. Create and rehearse a recoverable backup Use sqlite3.Connection.backup for the database in DATA_DIR and pause writers while taking the matching attachment snapshot. Keep schema version, hashes and a manifest for buffer. Restore into a separate empty directory or isolated deployment, with all outbound actions and schedules disabled. Recreate this proof: Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Compare ids/counts and open the result before recording the restore date. Never test a restore over the only live copy. Files: `OPERATIONS.md`, `scripts/backup.py` 3. Reproduce the first-run experience Use a new folder and only README instructions to reach the fixture outcome. Install from requirements.txt, initialize storage, run the tests and exercise the UI at 375px and 1280px; use keyboard-only controls and inspect browser errors. Record exactly what passed; do not mark unrun checks complete. Files: `README.md`, `verification.md` ```sh python -m pip install -r requirements.txt python -m unittest discover -s test ``` ### Done when - [ ] A new folder reaches the documented fixture outcome using only README instructions. - [ ] A backup restored in isolation preserves the proof data and can be opened. ### Watch out - Export without an import or restore rehearsal is not verified portability. ## Not in this build - An idempotency key is not a permanent exactly-once guarantee; do not blindly retry after long outages. - This is a text-only Mastodon posting queue with visible uncertain outcomes; full Buffer feature parity, vendor hosting and support are not included. - multi-network API maintenance - post previews - analytics - approvals - mobile apps - team queues - platform policy changes ## After v1, if you want it - Extend publish and reconcile only after the fixture and recovery checks pass. - Before adding another integration, document its credentials, limits, cost and failure behavior with primary-source links.
.env.example
# Copy to .env and fill in. Never commit .env; this file documents it. # Required. A new private folder this application creates on first run; never serve it as static files. DATA_DIR=./data/buffer # Required · secret. Generate with python -c "import secrets; print(secrets.token_hex(32))" and save only in .env. SECRET_KEY=replace-with-a-random-secret # Required. Use indie for loopback-only personal work. Product mode must refuse to start until owner login and the deployment gates are configured. APP_MODE=indie # Required. The origin used for local forms and links; replace with the chosen HTTPS origin in product mode. SITE_URL=http://127.0.0.1:5000 # Required. Your actual instance origin, validated and allowlisted by the owner. MASTODON_URL=https://your-instance.example # Required · secret. The access token created in your own instance Development settings. MASTODON_TOKEN=replace-with-scoped-token
PRODUCT.md
# Buffer · product brief ## Problem Posting to one or two APIs is easy, but maintaining social platform auth, queues, previews, analytics, and API-policy compliance is real ongoing work. ## Product outcome An operated version of a text-only Mastodon posting queue with visible uncertain outcomes, with authorized access, restore evidence and honest scope limits. ## Target user A builder who needs a maintainable product foundation, not a one-off demo. ## Required capabilities - OAuth/API access for each social network - hosted scheduler - database - media storage - retry/logging ## Explicit non-goals for v1 - An idempotency key is not a permanent exactly-once guarantee; do not blindly retry after long outages. - This is a text-only Mastodon posting queue with visible uncertain outcomes; full Buffer feature parity, vendor hosting and support are not included. - multi-network API maintenance - post previews - analytics - approvals - mobile apps - team queues - platform policy changes ## Success criteria - A revoked token fails preflight without modifying the queue. - Two posts fill successive free slots without sharing one slot. - Replaying an acknowledged post never makes a second API call. - A private-data authorization check passes using a second identity. - An off-host restore drill has a date, observed result and recovery time in OPERATIONS.md. - README names the excluded vendor capabilities and actual provider/hosting costs.
BRIEF.md
# Build brief · Buffer The one-shot brief this plan expands. `BUILD_PLAN.md` (or `MILESTONES.md`) is the same sequence broken into steps and checks; where the two disagree, the plan wins. Build me a text-only Mastodon posting queue with visible uncertain outcomes as a bounded replacement for Buffer. Build it in phases in the order below. Do not write the whole product in one pass. Finish the current phase, run its Done when checks, fix failures, then continue. Indie mode completes Phases 1-5. Phase 6 is required before shared or public deployment. ### Stack (fixed, do not substitute) - Runtime: Python 3.12+ and Flask. A small local HTTP application with readable server-side handlers and no JavaScript build pipeline. - Storage: SQLite through Python sqlite3. Local ownership with explicit transactions and a portable backup path. - Interface: Jinja HTML templates, CSS and vanilla JavaScript. Implement the specified screens directly with labelled controls and progressive enhancement. - Verification: Python unittest and browser acceptance fixtures. Check invariants and the actual user workflow before the next phase. ### Data model (create this before Phase 1) - posts(id,text,scheduled_utc,timezone,state,revision) - attempts(id,post_id,idempotency_key,started_at,outcome,remote_id,error) - slots(id,weekday,local_time) - account(id,instance_url) - Use stable ids and explicit relationships; add auxiliary tables named by the phases before those phases use them. - Acceptance fixture: Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. ### Prerequisites and configuration - Python 3.12 or newer and a terminal: Install Python from python.org. Open a terminal in a new empty project folder. On Windows, use py -3 where this guide says python if python is not on PATH; on macOS/Linux use python3 if needed. Create .venv and activate it before installing packages. Verify: python --version reports 3.12+ and python -c "import sqlite3" succeeds. Cost: Python is free; this local prototype requires no hosting subscription. - A current desktop browser and text editor: Use an installed Chrome, Firefox or Edge browser. Open the empty project folder in your editor; open the terminal there, not in this catalog repository. Verify: You can create a text file in the project folder and open browser developer tools. Cost: No paid service required for this local step. - Buffer acceptance sample: Create synthetic sample data before implementation: Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Save it under fixtures/ with the expected results in fixtures/README.md; use no real credentials or customer records. Verify: The fixture files and expected outcomes exist and can be inspected without a vendor account. Cost: No paid service required for this local step. - Confirm the bounded replacement: The deliverable is a text-only Mastodon posting queue with visible uncertain outcomes. Read every exclusion below. Indie mode runs locally; any public or shared use requires the product access and deployment gates first. Verify: You can name the primary workflow and the vendor features this version deliberately leaves out. Cost: No paid service required for this local step. - A token for your own Mastodon account: Open your instance preferences, Development, New application. Create an app with the minimal account verification and status-write permissions required by its API; copy its access token to .env. Use a test account and revoke the token when finished. Verify: The backend verifies the token identity without creating a post. Cost: Instance membership and usage conditions vary; check your instance before sending. - Configuration: DATA_DIR, SECRET_KEY, APP_MODE, SITE_URL, MASTODON_URL, MASTODON_TOKEN. Ship .env.example, replace placeholders and exclude secrets from git. ### Phase 1 · Local foundation and data contract Build: Create the runnable local foundation for a text-only Mastodon posting queue with visible uncertain outcomes, including the real schema and acceptance fixture. - Run the venv command first, then stop and activate it before running the remaining commands. Use your OS instructions: Windows .venv\Scripts\activate.bat in cmd, or .venv\Scripts\Activate.ps1 in PowerShell; macOS/Linux source .venv/bin/activate. Then install the listed packages. Create app.py exposing app, load .env with python-dotenv, and add a /healthz route. Freeze tested dependency versions to requirements.txt. Create .env manually from .env.example; replace SECRET_KEY before launch. Commands, after creating the named files: `python -m venv .venv`; `python -m pip install Flask Flask-WTF python-dotenv waitress tzdata`; `python -m pip freeze > requirements.txt`; `python -m flask --app app run --host 127.0.0.1`. - For database-backed state create schema.sql and db.py using this model: posts(id,text,scheduled_utc,timezone,state,revision); attempts(id,post_id,idempotency_key,started_at,outcome,remote_id,error); slots(id,weekday,local_time); account(id,instance_url). Add the auxiliary relationships explicitly used in later phases; use stable ids, foreign keys, parameterized values and transactions. For canonical files use atomic replacement and hashes instead. Implement python manage.py init and python manage.py seed to create only synthetic data: Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Re-running init must not erase data. Commands, after creating the named files: `python manage.py init`; `python manage.py seed`. - Install Flask-WTF CSRF protection for forms and same-origin fetches, validate Host and Origin against SITE_URL, bound inputs and escape output. Deliberately public intake endpoints get bounded validation and rate limits; signed provider webhooks use signature checks instead of browser CSRF tokens. All other admin routes stay local until product authentication exists. When a later phase tests viewer/member permissions, implement the users, hashed passwords, expiring server sessions and role checks in this foundation first; product mode must never use a fabricated identity from request input. Add error, empty, keyboard-focus and retry states now. - Trap: The Flask development server is for local development only. Loopback binding alone does not replace CSRF and origin validation. Done when: The documented start command serves /healthz and the initial screen at http://127.0.0.1:5000. Restarting preserves the seeded records or canonical files; running init again deletes nothing. A cross-origin state-changing request to an admin route is refused. Do not build yet: Do not start account preflight and composer until these checks pass. ### Phase 2 · Account preflight and composer Build: Account preflight and composer for Buffer: Connect one user-owned Mastodon account with a narrowly scoped token kept on the backend; verify the account before scheduling. - Connect one user-owned Mastodon account with a narrowly scoped token kept on the backend; verify the account before scheduling. - Build a plain-text composer using the instance reported limits and a local validation error when text is too long. - Use Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Check: A revoked token fails preflight without modifying the queue. Then check: A draft remains editable and is not sent during account verification. Add a focused regression for the failure case under test/ using a temporary database or folder and fake external services; also perform the visible workflow in a browser. Commands, after creating the named files: `python -m unittest discover -s test`. - Trap: Instances can differ; do not hardcode a universal character limit or API price. Done when: A revoked token fails preflight without modifying the queue. A draft remains editable and is not sent during account verification. Do not build yet: Do not start timezone slots until these checks pass. ### Phase 3 · Timezone slots Build: Timezone slots for Buffer: Create weekday/local-time slot rules and materialize upcoming slots into UTC with an explicit policy for missing or repeated DST times. - Create weekday/local-time slot rules and materialize upcoming slots into UTC with an explicit policy for missing or repeated DST times. - Support an exact scheduled time override and revision-safe rescheduling; show both local time and UTC in the queue. - Use Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Check: Two posts fill successive free slots without sharing one slot. Then check: The DST fixture creates no duplicate occurrence and displays the chosen policy. Add a focused regression for the failure case under test/ using a temporary database or folder and fake external services; also perform the visible workflow in a browser. Commands, after creating the named files: `python -m unittest discover -s test`. - Trap: A local time string alone cannot uniquely identify an instant around a clock change. Done when: Two posts fill successive free slots without sharing one slot. The DST fixture creates no duplicate occurrence and displays the chosen policy. Do not build yet: Do not start publish and reconcile until these checks pass. ### Phase 4 · Publish and reconcile Build: Publish and reconcile for Buffer: Use POST /api/v1/statuses with a stable Idempotency-Key per post, a lease and accepted/failed/unknown states. - Use POST /api/v1/statuses with a stable Idempotency-Key per post, a lease and accepted/failed/unknown states. - Persist the returned remote id and link only after acknowledgement; bound retries and reconcile uncertain outcomes before a delayed replay. - Use Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Check: Replaying an acknowledged post never makes a second API call. Then check: The simulated timeout becomes unknown and stays visible for review. Add a focused regression for the failure case under test/ using a temporary database or folder and fake external services; also perform the visible workflow in a browser. Commands, after creating the named files: `python -m unittest discover -s test`. - Trap: An idempotency key is not a permanent exactly-once guarantee; do not blindly retry after long outages. Done when: Replaying an acknowledged post never makes a second API call. The simulated timeout becomes unknown and stays visible for review. Do not build yet: Do not start portable delivery and clean-start proof until these checks pass. ### Phase 5 · Portable delivery and clean-start proof Build: Finish the Buffer replacement with a documented first-run path and a recoverable export. - Document prerequisites, every configuration variable, data locations and the three domain workflows: Account preflight and composer; Timezone slots; Publish and reconcile. Include the exclusions, actual costs and source check date 2026-09-05. Commands shown earlier that reference project files are files the builder must implement before running them. - Use sqlite3.Connection.backup for the database in DATA_DIR and pause writers while taking the matching attachment snapshot. Keep schema version, hashes and a manifest for buffer. Restore into a separate empty directory or isolated deployment, with all outbound actions and schedules disabled. Recreate this proof: Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Compare ids/counts and open the result before recording the restore date. Never test a restore over the only live copy. - Use a new folder and only README instructions to reach the fixture outcome. Install from requirements.txt, initialize storage, run the tests and exercise the UI at 375px and 1280px; use keyboard-only controls and inspect browser errors. Record exactly what passed; do not mark unrun checks complete. Commands, after creating the named files: `python -m pip install -r requirements.txt`; `python -m unittest discover -s test`. - Trap: Export without an import or restore rehearsal is not verified portability. Done when: A new folder reaches the documented fixture outcome using only README instructions. A backup restored in isolation preserves the proof data and can be opened. Do not build yet: Do not start operate and share with access controls until these checks pass. ### Phase 6 · Operate and share with access controls (product-builder only) Build: Product-builder only: make a text-only Mastodon posting queue with visible uncertain outcomes operable for its stated audience before allowing remote access. - Add owner/member/viewer authorization as appropriate, password hashes through Werkzeug, expiring server-side sessions, CSRF and login rate limits. Add users, sessions and audit schema migrations plus an owner-init command prompting securely for its password. Enforce ownership on every private read/write/download and fail closed when product setup is incomplete. Existing learner or admin identities must use this same boundary. - Serve app:app with Waitress on loopback behind Caddy HTTPS. Configure trusted proxy headers narrowly, Secure/HttpOnly/SameSite cookies, upload limits, request ids and structured logs without private content. Run background jobs as a separate supervised process when the domain workflow requires them. Commands, after creating the named files: `waitress-serve --listen=127.0.0.1:5000 app:app`. - Add a scheduled encrypted off-host backup using this procedure: Use sqlite3.Connection.backup for the database in DATA_DIR and pause writers while taking the matching attachment snapshot. Keep schema version, hashes and a manifest for buffer. Monitor health, disk space, failed jobs and backup age. Stop the service to test an alert; rehearse recovery with outbound effects disabled and record recovery time. Rotate any exposed credentials and require reconciliation before resuming queues. - Trap: Product mode is additional engineering, not a switch that makes a local prototype production-ready. Done when: An unauthenticated visitor cannot read private records, download private files or mutate the admin surface. A viewer cannot mutate data by making a direct request, and guessed ids cannot cross ownership boundaries. Stopping the service triggers the configured alert and the latest off-host backup restores the fixture in isolation. Do not build yet: Do not add new providers or vendor-scale features until the release gates are recorded. ### Out of scope (and why) - An idempotency key is not a permanent exactly-once guarantee; do not blindly retry after long outages. - This is a text-only Mastodon posting queue with visible uncertain outcomes; full Buffer feature parity, vendor hosting and support are not included. - multi-network API maintenance: retain the paid product if this capability is essential; it is outside this bounded build. - post previews: retain the paid product if this capability is essential; it is outside this bounded build. - analytics: retain the paid product if this capability is essential; it is outside this bounded build. - approvals: retain the paid product if this capability is essential; it is outside this bounded build. - mobile apps: retain the paid product if this capability is essential; it is outside this bounded build. - team queues: retain the paid product if this capability is essential; it is outside this bounded build. - platform policy changes: retain the paid product if this capability is essential; it is outside this bounded build. ### README must contain - Exact install, configure, initialize, start, test and recovery commands for a clean folder. - The schema, fixture, acceptance results, private data locations and export format. - Every prerequisite and secret source, actual running costs and deliberately excluded capabilities. - An honest distinction between tests actually run and checks still awaiting real credentials or deployment. - Dependency documentation reviewed 2026-09-05: https://flask.palletsprojects.com/en/stable/installation/ ; https://docs.python.org/3/library/sqlite3.html ; https://flask-wtf.readthedocs.io/en/1.2.x/csrf/ ; https://docs.pylonsproject.org/projects/waitress/en/stable/usage.html ; https://docs.joinmastodon.org/methods/statuses/ ; https://docs.joinmastodon.org/client/token/. Recheck before upgrading; freeze the versions actually tested.
ARCHITECTURE.md
# Architecture · Buffer ## Stack | Part | Choice | Why | | --- | --- | --- | | Runtime | Python 3.12+ and Flask | A small local HTTP application with readable server-side handlers and no JavaScript build pipeline. | | Storage | SQLite through Python sqlite3 | Local ownership with explicit transactions and a portable backup path. | | Interface | Jinja HTML templates, CSS and vanilla JavaScript | Implement the specified screens directly with labelled controls and progressive enhancement. | | Verification | Python unittest and browser acceptance fixtures | Check invariants and the actual user workflow before the next phase. | ## Modules Each module has one owner concern and a documented way to replace it. | Module | Owns | How to replace it | | --- | --- | --- | | Data and identity | posts(id,text,scheduled_utc,timezone,state,revision); attempts(id,post_id,idempotency_key,started_at,outcome,remote_id,error); slots(id,weekday,local_time); account(id,instance_url) | Keep stable ids and a versioned repository interface; migrate storage behind it with a fixture round-trip. | | Account preflight and composer | Connect one user-owned Mastodon account with a narrowly scoped token kept on the backend; verify the account before scheduling. | Keep the acceptance contract: A revoked token fails preflight without modifying the queue. Replace only this module after replaying its fixture; preserve ids and existing records. | | Timezone slots | Create weekday/local-time slot rules and materialize upcoming slots into UTC with an explicit policy for missing or repeated DST times. | Keep the acceptance contract: Two posts fill successive free slots without sharing one slot. Replace only this module after replaying its fixture; preserve ids and existing records. | | Publish and reconcile | Use POST /api/v1/statuses with a stable Idempotency-Key per post, a lease and accepted/failed/unknown states. | Keep the acceptance contract: Replaying an acknowledged post never makes a second API call. Replace only this module after replaying its fixture; preserve ids and existing records. | | Operations | Use sqlite3.Connection.backup for the database in DATA_DIR and pause writers while taking the matching attachment snapshot. Keep schema version, hashes and a manifest for buffer. | Change host or backup destination only after an isolated restore and authorization check. | ## Configuration Every runtime setting is an environment variable documented in `.env.example`, validated at startup, with a safe local default wherever one exists. - `DATA_DIR` · required · A new private folder this application creates on first run; never serve it as static files. - `SECRET_KEY` · required, secret · Generate with python -c "import secrets; print(secrets.token_hex(32))" and save only in .env. - `APP_MODE` · required · Use indie for loopback-only personal work. Product mode must refuse to start until owner login and the deployment gates are configured. - `SITE_URL` · required · The origin used for local forms and links; replace with the chosen HTTPS origin in product mode. - `MASTODON_URL` · required · Your actual instance origin, validated and allowlisted by the owner. - `MASTODON_TOKEN` · required, secret · The access token created in your own instance Development settings. ## Production baseline - Security: least privilege, input validation at every boundary, secret redaction in logs, rate limits on abuse-prone paths, no invented security primitives. - Data: explicit schema and migrations, transactional writes where integrity matters, backup and restore procedures that have been exercised. - Integrations: adapters around third-party providers, idempotent webhook or job processing, bounded retries, timeouts. - Observability: structured logs with request or operation ids, an error-tracking hook, and health and readiness checks where a server exists. - Quality: unit tests for domain rules, integration tests at module boundaries, one end-to-end test of the critical path. ## Decision records For each dependency in the stack table, keep a short note: why it was chosen, its failure mode, and how it is replaced. Do not add infrastructure until a requirement in `PRODUCT.md` justifies it.
AGENTS.md
# Agent instructions · Buffer product build - Read `PRODUCT.md` and `ARCHITECTURE.md` before changing code. The stack is fixed: Python 3.12+ and Flask, SQLite through Python sqlite3, Jinja HTML templates, CSS and vanilla JavaScript, Python unittest and browser acceptance fixtures. - Implement milestone by milestone from `MILESTONES.md`; keep each change reviewable and leave the application runnable at every commit. - Treat authentication, payments, encryption, imports, webhooks and destructive actions as high-risk boundaries when present. - Never invent cryptography or silently weaken a requirement to make a check pass. - Put every external service behind an interface with a deterministic fake for tests. - Add migrations and rollback or recovery notes for every persistent data change. - Log useful operational context without credentials, tokens, passwords or personal data. - Update documentation and run every check before completing a milestone. ## Known traps - The Flask development server is for local development only. Loopback binding alone does not replace CSRF and origin validation. - Instances can differ; do not hardcode a universal character limit or API price. - A local time string alone cannot uniquely identify an instant around a clock change. - An idempotency key is not a permanent exactly-once guarantee; do not blindly retry after long outages. - Export without an import or restore rehearsal is not verified portability. - Product mode is additional engineering, not a switch that makes a local prototype production-ready.
MILESTONES.md
# Delivery milestones · Buffer Estimated effort: **multi-day** for the indie phases; the production-only milestones add the trust and operability layer. ## M1 · Local foundation and data contract Create the runnable local foundation for a text-only Mastodon posting queue with visible uncertain outcomes, including the real schema and acceptance fixture. ### Steps 1. Create and start the local application Run the venv command first, then stop and activate it before running the remaining commands. Use your OS instructions: Windows .venv\Scripts\activate.bat in cmd, or .venv\Scripts\Activate.ps1 in PowerShell; macOS/Linux source .venv/bin/activate. Then install the listed packages. Create app.py exposing app, load .env with python-dotenv, and add a /healthz route. Freeze tested dependency versions to requirements.txt. Create .env manually from .env.example; replace SECRET_KEY before launch. Files: `app.py`, `requirements.txt`, `.env.example`, `.gitignore` ```sh python -m venv .venv python -m pip install Flask Flask-WTF python-dotenv waitress tzdata python -m pip freeze > requirements.txt python -m flask --app app run --host 127.0.0.1 ``` 2. Implement storage and seed the named fixture For database-backed state create schema.sql and db.py using this model: posts(id,text,scheduled_utc,timezone,state,revision); attempts(id,post_id,idempotency_key,started_at,outcome,remote_id,error); slots(id,weekday,local_time); account(id,instance_url). Add the auxiliary relationships explicitly used in later phases; use stable ids, foreign keys, parameterized values and transactions. For canonical files use atomic replacement and hashes instead. Implement python manage.py init and python manage.py seed to create only synthetic data: Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Re-running init must not erase data. Files: `schema.sql`, `db.py`, `manage.py`, `fixtures/README.md` ```sh python manage.py init python manage.py seed ``` 3. Protect the local request boundary Install Flask-WTF CSRF protection for forms and same-origin fetches, validate Host and Origin against SITE_URL, bound inputs and escape output. Deliberately public intake endpoints get bounded validation and rate limits; signed provider webhooks use signature checks instead of browser CSRF tokens. All other admin routes stay local until product authentication exists. When a later phase tests viewer/member permissions, implement the users, hashed passwords, expiring server sessions and role checks in this foundation first; product mode must never use a fabricated identity from request input. Add error, empty, keyboard-focus and retry states now. Files: `app.py`, `templates/base.html`, `test/test_foundation.py` ### Done when - [ ] The documented start command serves /healthz and the initial screen at http://127.0.0.1:5000. - [ ] Restarting preserves the seeded records or canonical files; running init again deletes nothing. - [ ] A cross-origin state-changing request to an admin route is refused. ### Watch out - The Flask development server is for local development only. Loopback binding alone does not replace CSRF and origin validation. ## M2 · Account preflight and composer Account preflight and composer for Buffer: Connect one user-owned Mastodon account with a narrowly scoped token kept on the backend; verify the account before scheduling. ### Steps 1. Connect one user-owned Mastodon account with a narrowly scoped token kept on the backend; verify the account before scheduling. Connect one user-owned Mastodon account with a narrowly scoped token kept on the backend; verify the account before scheduling. Files: `features/account_preflight_and_composer.py`, `templates/account_preflight_and_composer.html` 2. Build a plain-text composer using the instance reported limits and a local validation error when text is too long. Build a plain-text composer using the instance reported limits and a local validation error when text is too long. Files: `features/account_preflight_and_composer.py` 3. Exercise the acceptance fixture Use Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Check: A revoked token fails preflight without modifying the queue. Then check: A draft remains editable and is not sent during account verification. Add a focused regression for the failure case under test/ using a temporary database or folder and fake external services; also perform the visible workflow in a browser. Files: `test/test_account_preflight_and_composer.py` ```sh python -m unittest discover -s test ``` ### Done when - [ ] A revoked token fails preflight without modifying the queue. - [ ] A draft remains editable and is not sent during account verification. ### Watch out - Instances can differ; do not hardcode a universal character limit or API price. ## M3 · Timezone slots Timezone slots for Buffer: Create weekday/local-time slot rules and materialize upcoming slots into UTC with an explicit policy for missing or repeated DST times. ### Steps 1. Create weekday/local-time slot rules and materialize upcoming slots into UTC with an explicit policy for missing or repeated DST times. Create weekday/local-time slot rules and materialize upcoming slots into UTC with an explicit policy for missing or repeated DST times. Files: `features/timezone_slots.py`, `templates/timezone_slots.html` 2. Support an exact scheduled time override and revision-safe rescheduling; show both local time and UTC in the queue. Support an exact scheduled time override and revision-safe rescheduling; show both local time and UTC in the queue. Files: `features/timezone_slots.py` 3. Exercise the acceptance fixture Use Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Check: Two posts fill successive free slots without sharing one slot. Then check: The DST fixture creates no duplicate occurrence and displays the chosen policy. Add a focused regression for the failure case under test/ using a temporary database or folder and fake external services; also perform the visible workflow in a browser. Files: `test/test_timezone_slots.py` ```sh python -m unittest discover -s test ``` ### Done when - [ ] Two posts fill successive free slots without sharing one slot. - [ ] The DST fixture creates no duplicate occurrence and displays the chosen policy. ### Watch out - A local time string alone cannot uniquely identify an instant around a clock change. ## M4 · Publish and reconcile Publish and reconcile for Buffer: Use POST /api/v1/statuses with a stable Idempotency-Key per post, a lease and accepted/failed/unknown states. ### Steps 1. Use POST /api/v1/statuses with a stable Idempotency-Key per post, a lease and accepted/failed/unknown states. Use POST /api/v1/statuses with a stable Idempotency-Key per post, a lease and accepted/failed/unknown states. Files: `features/publish_and_reconcile.py`, `templates/publish_and_reconcile.html` 2. Persist the returned remote id and link only after acknowledgement; bound retries and reconcile uncertain outcomes before a delayed replay. Persist the returned remote id and link only after acknowledgement; bound retries and reconcile uncertain outcomes before a delayed replay. Files: `features/publish_and_reconcile.py` 3. Exercise the acceptance fixture Use Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Check: Replaying an acknowledged post never makes a second API call. Then check: The simulated timeout becomes unknown and stays visible for review. Add a focused regression for the failure case under test/ using a temporary database or folder and fake external services; also perform the visible workflow in a browser. Files: `test/test_publish_and_reconcile.py` ```sh python -m unittest discover -s test ``` ### Done when - [ ] Replaying an acknowledged post never makes a second API call. - [ ] The simulated timeout becomes unknown and stays visible for review. ### Watch out - An idempotency key is not a permanent exactly-once guarantee; do not blindly retry after long outages. ## M5 · Portable delivery and clean-start proof Finish the Buffer replacement with a documented first-run path and a recoverable export. ### Steps 1. Write the user-facing runbook Document prerequisites, every configuration variable, data locations and the three domain workflows: Account preflight and composer; Timezone slots; Publish and reconcile. Include the exclusions, actual costs and source check date 2026-09-05. Commands shown earlier that reference project files are files the builder must implement before running them. Files: `README.md`, `.env.example` 2. Create and rehearse a recoverable backup Use sqlite3.Connection.backup for the database in DATA_DIR and pause writers while taking the matching attachment snapshot. Keep schema version, hashes and a manifest for buffer. Restore into a separate empty directory or isolated deployment, with all outbound actions and schedules disabled. Recreate this proof: Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Compare ids/counts and open the result before recording the restore date. Never test a restore over the only live copy. Files: `OPERATIONS.md`, `scripts/backup.py` 3. Reproduce the first-run experience Use a new folder and only README instructions to reach the fixture outcome. Install from requirements.txt, initialize storage, run the tests and exercise the UI at 375px and 1280px; use keyboard-only controls and inspect browser errors. Record exactly what passed; do not mark unrun checks complete. Files: `README.md`, `verification.md` ```sh python -m pip install -r requirements.txt python -m unittest discover -s test ``` ### Done when - [ ] A new folder reaches the documented fixture outcome using only README instructions. - [ ] A backup restored in isolation preserves the proof data and can be opened. ### Watch out - Export without an import or restore rehearsal is not verified portability. ## M6 · Operate and share with access controls (production only) Product-builder only: make a text-only Mastodon posting queue with visible uncertain outcomes operable for its stated audience before allowing remote access. ### Steps 1. Establish owner access before exposure Add owner/member/viewer authorization as appropriate, password hashes through Werkzeug, expiring server-side sessions, CSRF and login rate limits. Add users, sessions and audit schema migrations plus an owner-init command prompting securely for its password. Enforce ownership on every private read/write/download and fail closed when product setup is incomplete. Existing learner or admin identities must use this same boundary. Files: `ARCHITECTURE.md`, `OPERATIONS.md` 2. Deploy a monitored service Serve app:app with Waitress on loopback behind Caddy HTTPS. Configure trusted proxy headers narrowly, Secure/HttpOnly/SameSite cookies, upload limits, request ids and structured logs without private content. Run background jobs as a separate supervised process when the domain workflow requires them. Files: `Caddyfile`, `OPERATIONS.md` ```sh waitress-serve --listen=127.0.0.1:5000 app:app ``` 3. Rehearse loss and recovery Add a scheduled encrypted off-host backup using this procedure: Use sqlite3.Connection.backup for the database in DATA_DIR and pause writers while taking the matching attachment snapshot. Keep schema version, hashes and a manifest for buffer. Monitor health, disk space, failed jobs and backup age. Stop the service to test an alert; rehearse recovery with outbound effects disabled and record recovery time. Rotate any exposed credentials and require reconciliation before resuming queues. Files: `OPERATIONS.md`, `release-checklist.md` ### Done when - [ ] An unauthenticated visitor cannot read private records, download private files or mutate the admin surface. - [ ] A viewer cannot mutate data by making a direct request, and guessed ids cannot cross ownership boundaries. - [ ] Stopping the service triggers the configured alert and the latest off-host backup restores the fixture in isolation. ### Watch out - Product mode is additional engineering, not a switch that makes a local prototype production-ready.
OPERATIONS.md
# Operations · Buffer ## Backup Use sqlite3.Connection.backup for the database in DATA_DIR and pause writers while taking the matching attachment snapshot. Keep schema version, hashes and a manifest for buffer. ## Restore Restore into a separate empty directory or isolated deployment, with all outbound actions and schedules disabled. Recreate this proof: Two queued posts, a due post with a simulated timeout and a daylight-saving boundary slot. Compare ids/counts and open the result before recording the restore date. Never test a restore over the only live copy. Do a restore drill before the first real user, and write the date here when it passes. ## Monitoring Check HTTP availability, free disk, backup age and domain failures for Account preflight and composer, Timezone slots, Publish and reconcile. Alert without logging private payloads. ## Incident checklist Pause outbound jobs and public intake as appropriate, preserve redacted diagnostics, restore an isolated verified backup, rotate affected credentials and reconcile uncertain effects before reopening. 1. Contain the issue without destroying evidence or user data. 2. Record the timeline and affected scope. 3. Rotate exposed secrets and revoke compromised sessions or credentials. 4. Restore from a verified backup when needed. 5. Document the root cause, the remediation and the regression test. ## Release gate - [ ] A revoked token fails preflight without modifying the queue. - [ ] Two posts fill successive free slots without sharing one slot. - [ ] Replaying an acknowledged post never makes a second API call. - [ ] A private-data authorization check passes using a second identity. - [ ] An off-host restore drill has a date, observed result and recovery time in OPERATIONS.md. - [ ] README names the excluded vendor capabilities and actual provider/hosting costs. ## Launch constraint Do not market omitted Buffer capabilities as implemented. The non-goals in `PRODUCT.md` remain user-visible limitations until they are deliberately delivered.
.env.example
# Copy to .env and fill in. Never commit .env; this file documents it. # Required. A new private folder this application creates on first run; never serve it as static files. DATA_DIR=./data/buffer # Required · secret. Generate with python -c "import secrets; print(secrets.token_hex(32))" and save only in .env. SECRET_KEY=replace-with-a-random-secret # Required. Use indie for loopback-only personal work. Product mode must refuse to start until owner login and the deployment gates are configured. APP_MODE=indie # Required. The origin used for local forms and links; replace with the chosen HTTPS origin in product mode. SITE_URL=http://127.0.0.1:5000 # Required. Your actual instance origin, validated and allowlisted by the owner. MASTODON_URL=https://your-instance.example # Required · secret. The access token created in your own instance Development settings. MASTODON_TOKEN=replace-with-scoped-token
$ choose a build depth, inspect the files, then open the complete pack in your agent
They pay because social APIs break and scheduling must be reliable.
xmulti-network API maintenance
xpost previews
xanalytics
xapprovals
xmobile apps
xteam queues
xplatform policy changes
share on X ↗"I just replaced Buffer ($6/mo) with one prompt"
Don't feel like building it? These folks already made it free.
PostizThe broadest open scheduler here; free means running PostgreSQL, Redis, Temporal and your own platform credentials.open source↗
Mixpost LiteA polished single-user scheduler with queues and basic analytics; the serious team features live in the paid edition.open source↗
BrightBean StudioA startlingly complete free scheduler: approvals, inbox, analytics, clients, API and MCP, with someone else running the servers.open source↗all 8 free alternatives to Buffer →· no votes, no pay-to-list · just what's real
Buffer pricing
| plan | monthly | annual (per mo) | what you get |
|---|---|---|---|
| free | $0/workspace | $0/workspace | 3 channels; 10 scheduled posts/channel; 100 ideas; 1 user; 1 API key; 3,000 API requests/month; 5 AI reply suggestions/week; 1 saved reply; 30-day analytics history. |
| essentials | $6/workspace | $5/workspace | Per connected channel; up to 5,000 queued posts/channel under fair use; 1 user; 3 API keys; 7,500 API requests/month. |
| team | $12/workspace | $10/workspace | Per connected channel; up to 5,000 queued posts/channel under fair use; unlimited users; 5 API keys; 15,000 API requests/month. |
free tier3 channels; 10 scheduled posts/channel; 100 ideas; 1 user; 1 API key; 3,000 API requests/month; 5 AI reply suggestions/week; 1 saved reply; 30-day analytics history
billingmonthly + annual (2 months free); 14-day no-card trial, then auto-downgrades to Free if not upgraded
hidden costsPricing is per connected channel, and a Start Page counts as a channel. Volume discounts begin after 10 channels, but the full current discount schedule is not publicly itemized.
verified 2026-08-14 · source ↗
Vibecode Buffer
Kinda. The core of Buffer is buildable in a weekend with the prompt on this page, but there are real gaps: multi-network API maintenance, post previews. Read the honest list above before committing.
How much does Buffer cost?
Buffer costs about $6/month (Essentials, checked 2026-07-30), which is $72 per year.
What do I lose by replacing Buffer?
Honestly: multi-network API maintenance; post previews; analytics; approvals; mobile apps; team queues; platform policy changes. If any of those are load-bearing for you, keep paying.
Is there an open-source alternative to Buffer?
Yes: Postiz (The broadest open scheduler here; free means running PostgreSQL, Redis, Temporal and your own platform credentials.) Mixpost Lite (A polished single-user scheduler with queues and basic analytics; the serious team features live in the paid edition.) BrightBean Studio (A startlingly complete free scheduler: approvals, inbox, analytics, clients, API and MCP, with someone else running the servers.) All 8 curated free alternatives are at vibecodeit.com/buffer/alternatives. The prompt is for when you want it exactly your way.