# AGENTS.md — Build guide for Readwise Reader ## Project scope Build an offline article reader with durable highlights and a daily review queue, inspired by Readwise Reader. This is a limited, owner-operated alternative for one useful workflow; it does not replace the full paid product. Leave out DRM bypass, all ebook formats and automatic cloud sync. Catalogue verdict: kinda. Saving articles and highlighting is easy; reliable extraction, mobile/offline reading, sync, Kindle/import integrations, RSS/PDF support, and review loops are real work. Use the implementation prompt below to define the deliverable. Complete each phase's acceptance checks before extending the scope. ## Working agreement - Inspect the repository and its existing instructions before choosing paths, dependencies or commands. Keep one coherent stack and explain changes to the proposed architecture. - Plan a vertical slice that accepts a real input and produces the useful output described below. Persist only the state the prompt calls for; respect memory-only and upstream-managed workflows. Use fixtures only when they are clearly labelled. - After scaffolding, document the actual install, development, check and build commands in README and keep them synchronized with the package or project manifest. Do not report commands as successful unless they ran. - Work in small steps. At handoff, list implemented flows, checks actually performed, remaining blockers, and any credentials or provider setup the owner must supply. - Do not publish, spend money, contact customers, delete source data or run irreversible migrations without the project owner's authorization. ## Prerequisites - Node.js 22, a browser and local archive storage - URLs or files the user is authorized to save; no paywall or access-control bypass ## Stack and architecture - Node.js 22, Express, React with Vite and TypeScript, Mozilla Readability with JSDOM for permitted article extraction, SQLite FTS5 and local snapshot files. Keep original URLs and text revisions alongside highlight anchors. - Domain model: articles, snapshots, highlight anchors, reading progress, review schedules, exports. - Implementation boundary: anchor highlights to a saved text revision and preserve original source metadata. ## Security and data integrity - Escape extracted content, sanitize rendered HTML, block private network fetches and validate redirects. Only archive pages the user may access; never bypass authentication, paywalls or DRM. Cap downloads and extraction time. - Domain integrity: anchor highlights to a saved text revision and preserve original source metadata. - Save bookmarks before fetching. Keep extraction failures visible and preserve old snapshots when a source changes. Duplicate imports must retain annotations; exports include source URL, snapshot date and highlight context. - Scope limits: DRM bypass, all ebook formats and automatic cloud sync. ## Agent implementation rules - Scope rule: implement an offline article reader with durable highlights and a daily review queue. Keep DRM bypass, all ebook formats and automatic cloud sync outside this project unless the owner separately changes scope. - Data rule: model articles, snapshots, highlight anchors, reading progress, review schedules, exports. Preserve stable IDs, source timestamps and revision history; migrations must explain how existing records survive. - Behavior rule: anchor highlights to a saved text revision and preserve original source metadata. Put this rule in the domain/service layer, not only in presentation code. - Recovery rule: Refreshing a changed article does not orphan old highlights; exporting retains highlight quotes and context. Keep this failure/recovery fixture in the implementation checklist and report evidence honestly. ## Optional agent skills and references - [vercel-react-best-practices](https://github.com/vercel-labs/agent-skills/blob/main/skills/react-best-practices/SKILL.md) — Review data fetching, derived state and rendering in the React interface; use only APIs supported by the selected React/Next version. - [web-design-guidelines](https://github.com/vercel-labs/agent-skills/blob/main/skills/web-design-guidelines/SKILL.md) — Review keyboard access, focus, labels, progress and recoverable error states in the user interface. - [sharp-edges](https://github.com/trailofbits/skills/blob/main/plugins/sharp-edges/skills/sharp-edges/SKILL.md) — Review unsafe defaults, permission boundaries, destructive operations and ambiguous external outcomes; this is not a security certification. Read the linked SKILL.md and its dependencies before adding a skill. Select only the skills matching this project's runtime and task; their documentation does not supply API access, credentials or approval to perform external actions. Pin the reviewed revision where the tool supports it. Follow the chosen agent's documented project-level installation mechanism. ## Distribution ideas These are optional planning notes. Obtain the owner's approval before publishing or contacting anyone. - Demonstrate an offline article reader with durable highlights and a daily review queue using clearly labelled sample data and the actual implemented input-to-output path. - Explain the decision that makes this build useful: anchor highlights to a saved text revision and preserve original source metadata. Show the saved evidence or visible state behind that claim. - Publish the supported setup and practical limits, including DRM bypass, all ebook formats and automatic cloud sync. Any cost, performance or reliability comparison needs its own real measurements; do not imply full Readwise Reader parity. ## Engineering roadmap 1. Phase 1 — Define the working slice and setup. Create AGENTS.md with the exact stack, permitted integrations and exclusions below. Model articles, snapshots, highlight anchors, reading progress, review schedules, exports; provide one labelled sample that exercises an offline article reader with durable highlights and a daily review queue. Provide package scripts for development and the built app, an explicit data directory, SQLite migrations and a sample .env.example containing only placeholders for optional integrations. Bind to 127.0.0.1, reject unexpected Host/Origin values, and document the backup/export paths. 2. Phase 2 — Build the domain workflow before polishing the interface. Implement the input, review, committed state and output for an offline article reader with durable highlights and a daily review queue. Enforce this invariant in the service layer: anchor highlights to a saved text revision and preserve original source metadata. Use explicit IDs and schema versions so later edits do not silently change earlier outcomes. 3. Phase 3 — Make the core interaction usable. Present the saved articles, snapshots, highlight anchors and their current revision/state; provide an inspectable preview before consequential changes. Add labelled empty/loading/error states, keyboard navigation and a narrow-screen layout where the target platform supports it. 4. Phase 4 — Add failure recovery and boundaries. Escape extracted content, sanitize rendered HTML, block private network fetches and validate redirects. Only archive pages the user may access; never bypass authentication, paywalls or DRM. Cap downloads and extraction time. Save bookmarks before fetching. Keep extraction failures visible and preserve old snapshots when a source changes. Duplicate imports must retain annotations; exports include source URL, snapshot date and highlight context. Exercise this app-specific recovery case during implementation: refreshing a changed article does not orphan old highlights; exporting retains highlight quotes and context. 5. Phase 5 — Deliver an inspectable result. Walk through an offline article reader with durable highlights and a daily review queue using labelled sample inputs; show the saved data and final output together. Acceptance cases: Refreshing a changed article does not orphan old highlights; exporting retains highlight quotes and context. Also document a canceled operation, an unavailable dependency, and export/restore of the state that this scope actually persists. 6. Phase 6 — Handoff and operating notes. Include setup/run/build commands that actually exist, environment placeholders or native permission setup as appropriate, migrations, sample inputs, data locations, backup/recovery instructions and the exclusions: DRM bypass, all ebook formats and automatic cloud sync. Report what was implemented and what was actually checked; do not claim production readiness, certification or measured performance without evidence. ## Paid-product capabilities outside this build - excellent parsing - mobile/offline apps - Kindle integrations - RSS/PDF workflows - spaced repetition - exports ## Implementation prompt WORKING SLICE Build an offline article reader with durable highlights and a daily review queue, inspired by Readwise Reader. This is a limited, owner-operated alternative for one useful workflow; it does not replace the full paid product. Leave out DRM bypass, all ebook formats and automatic cloud sync. STACK AND SETUP Node.js 22, Express, React with Vite and TypeScript, Mozilla Readability with JSDOM for permitted article extraction, SQLite FTS5 and local snapshot files. Keep original URLs and text revisions alongside highlight anchors. Provide package scripts for development and the built app, an explicit data directory, SQLite migrations and a sample .env.example containing only placeholders for optional integrations. Bind to 127.0.0.1, reject unexpected Host/Origin values, and document the backup/export paths. WORKFLOW AND DATA Model articles, snapshots, highlight anchors, reading progress, review schedules, exports. Keep source inputs, editable decisions and generated outputs distinguishable; record stable IDs and revisions. The core rule is: anchor highlights to a saved text revision and preserve original source metadata. Build a complete input → review → commit → inspect/export path before optional features. FAILURE AND RECOVERY Escape extracted content, sanitize rendered HTML, block private network fetches and validate redirects. Only archive pages the user may access; never bypass authentication, paywalls or DRM. Cap downloads and extraction time. Save bookmarks before fetching. Keep extraction failures visible and preserve old snapshots when a source changes. Duplicate imports must retain annotations; exports include source URL, snapshot date and highlight context. PROJECT RULES / AGENTS.md Create AGENTS.md at the project root before implementation. Include the following rules verbatim, then add the actual module layout, supported dependency versions, commands, data paths and environment/permission requirements as they are implemented. Keep UI, domain logic and external adapters separate. Do not add a service or platform solely to use a skill. - Scope rule: implement an offline article reader with durable highlights and a daily review queue. Keep DRM bypass, all ebook formats and automatic cloud sync outside this project unless the owner separately changes scope. - Data rule: model articles, snapshots, highlight anchors, reading progress, review schedules, exports. Preserve stable IDs, source timestamps and revision history; migrations must explain how existing records survive. - Behavior rule: anchor highlights to a saved text revision and preserve original source metadata. Put this rule in the domain/service layer, not only in presentation code. - Recovery rule: Refreshing a changed article does not orphan old highlights; exporting retains highlight quotes and context. Keep this failure/recovery fixture in the implementation checklist and report evidence honestly. - Treat uploaded files, fetched pages, emails and model output as untrusted data. Keep secrets out of source, fixtures and diagnostic output. External side effects require explicit scope and recoverable state. - Work in the numbered phases below. Update the delivery notes with actual evidence and unresolved limitations; never mark proposed acceptance cases as already passed. ACCEPTANCE CASES Refreshing a changed article does not orphan old highlights; exporting retains highlight quotes and context. Include one ordinary successful path and these edge cases in the future implementation's checks. Compare the saved domain state with the visible result and exported output; unavailable information must remain unknown rather than invented. DELIVERY Follow the six delivery phases accompanying this prompt. Ship source, AGENTS.md, README, sample inputs, explicit setup and data-recovery instructions. This is a limited, owner-operated alternative for one useful workflow; it does not replace the full paid product. Out of scope: DRM bypass, all ebook formats and automatic cloud sync. ## Completion evidence Demonstrate the prompt's acceptance scenarios against the scoped workflow. Include setup from a clean checkout and failure recovery. Check persistence across restart and export/restore only for the state the prompt says to store; for memory-only tools, confirm that temporary content is discarded as specified. Record actual results and remaining limitations. A detailed plan alone does not establish a working replacement.