AGENTS.md — AI Coding Agent Instructions

For: Claude Code, OpenAI Codex, Cursor, GitHub Copilot, Windsurf Cascade, and any AI coding agent. Repo: learning_ai_notes — NoteLett structured notes platform for humans and AI agents. See also: docs/PRD.md for full product spec, docs/ROADMAP.md for implementation plan.

1. Project Identity

Key	Value
Product	NoteLett
Product ID	`notelett`
Bundle ID (iOS)	`com.bytelyst.notelett`
Bundle ID (Android)	`com.notelett.app`
Domain	notelett.app
Repo	`learning_ai_notes`
Ecosystem	ByteLyst (shares platform-service with LysnrAI, MindLyst, ChronoMind, JarvisJr, NomGap, PeakPulse)

2. Repo Layout

learning_ai_notes/
├── backend/                          # Fastify 5 + TypeScript ESM backend (port 4016)
│   ├── src/
│   │   ├── lib/
│   │   │   ├── config.ts             # Zod-validated env config
│   │   │   ├── product-config.ts     # Product identity from shared/product.json
│   │   │   ├── auth.ts               # JWT extraction helper
│   │   │   ├── request-context.ts    # getUserId(req), getRequestProductId(req)
│   │   │   ├── cosmos-init.ts        # Cosmos container registration
│   │   │   ├── datastore.ts          # @bytelyst/datastore provider (Cosmos or memory)
│   │   │   ├── errors.ts             # Re-export from @bytelyst/errors
│   │   │   ├── llm.ts                # @bytelyst/llm lazy singleton
│   │   │   ├── copilot-transform.ts  # Copilot text transforms (shorten, expand, bulletize, etc.)
│   │   │   ├── embeddings.ts         # Embedding utilities (duplicate detection, related notes)
│   │   │   ├── feature-flags.ts      # 20 feature flags (core + Smart Actions)
│   │   │   ├── telemetry.ts          # Telemetry event buffer
│   │   │   └── field-encrypt.ts      # @bytelyst/field-encrypt singleton
│   │   ├── modules/
│   │   │   ├── notes/                # Note CRUD (types, repository, routes, test)
│   │   │   ├── workspaces/           # Workspace CRUD (types, repository, routes, test)
│   │   │   ├── note-relationships/   # Note linking (types, repository, routes, test)
│   │   │   ├── note-tasks/           # Task CRUD (types, repository, routes, test)
│   │   │   ├── note-artifacts/       # Artifact CRUD (types, repository, routes, test)
│   │   │   ├── note-agent-actions/   # Agent action audit trail + batch review (types, repository, routes, test)
│   │   │   ├── saved-views/          # Persisted saved views CRUD (types, repository, routes)
│   │   │   └── note-prompts/         # Smart Actions: prompt templates, runner, scheduler, webhooks
│   │   │       ├── types.ts           # PromptTemplateDoc, CRUD + Run schemas
│   │   │       ├── repository.ts      # Prompt template CRUD
│   │   │       ├── routes.ts          # Template CRUD + run + reading-time + suggest-tags + duplicates + links + compare + merge + URL extract + knowledge gaps
│   │   │       ├── runner.ts          # executePrompt() with retry + timeout
│   │   │       ├── scheduler.ts       # Cron schedules + webhook triggers + routes
│   │   │       └── seed.ts            # 20 built-in prompt templates
│   │   ├── mcp/
│   │   │   ├── note-tool-contracts.ts    # 8 MCP tool Zod schemas + definitions
│   │   │   ├── note-tools.ts             # 8 executable MCP tool implementations
│   │   │   ├── register-note-tools.ts    # Fastify plugin to register MCP tools
│   │   │   └── *.test.ts                 # MCP test files
│   │   └── server.ts                 # Fastify entrypoint (11 route modules + MCP + scheduler)
│   ├── package.json
│   └── tsconfig.json
│
├── web/                              # Next.js 16 + React 19 web app (App Router)
│   ├── src/
│   │   ├── app/
│   │   │   ├── page.tsx              # Landing page
│   │   │   ├── layout.tsx            # Root layout
│   │   │   └── (app)/               # Authenticated route group
│   │   │       ├── dashboard/        # Dashboard with metrics + recent notes
│   │   │       ├── workspaces/       # Workspace list + filters
│   │   │       ├── search/           # Search with saved queries
│   │   │       ├── reviews/          # Approval queue + agent timeline
│   │   │       └── notes/[noteId]/   # Note detail with editor
│   │   ├── components/               # React UI components
│   │   │   ├── Sidebar.tsx
│   │   │   ├── AppShell.tsx
│   │   │   ├── MetadataPanel.tsx
│   │   │   ├── LinkedNotesPanel.tsx
│   │   │   ├── AgentTimeline.tsx
│   │   │   ├── CreateNoteModal.tsx      # Create note modal (workspace, title, body, tags)
│   │   │   └── LinkNoteModal.tsx        # Link note relationship modal
│   │   └── lib/                      # Pure TS clients + config
│   │       ├── product-config.ts     # Product identity + API URLs
│   │       ├── api-helpers.ts        # Shared getAccessToken() + createNotesApiClient()
│   │       ├── auth.ts               # @bytelyst/react-auth provider
│   │       ├── notes-client.ts       # Notes API client (backend)
│   │       ├── review-client.ts      # Approval queue, timeline, batch review
│   │       ├── saved-views-client.ts # Saved views CRUD client
│   │       ├── platform.ts           # @bytelyst/platform-client
│   │       ├── telemetry.ts          # @bytelyst/telemetry-client
│   │       ├── diagnostics.ts        # @bytelyst/diagnostics-client
│   │       ├── feature-flags.ts      # @bytelyst/feature-flag-client
│   │       ├── kill-switch.ts        # @bytelyst/kill-switch-client
│   │       ├── extraction-client.ts  # Extraction-service task extraction
│   │       ├── blob-client.ts        # @bytelyst/blob-client wrapper
│   │       ├── use-keyboard-shortcuts.ts # Global keyboard shortcuts hook
│   │       ├── use-debounce.ts       # Debounce hook for search
│   │       └── types.ts              # Shared TypeScript interfaces
│   ├── package.json
│   └── tsconfig.json
│
├── mobile/                           # React Native + Expo companion app
│   ├── src/
│   │   ├── app/                      # Expo Router screens
│   │   │   ├── (tabs)/              # 4-tab navigator (home, inbox, capture, settings)
│   │   │   ├── note/[noteId].tsx    # Note detail
│   │   │   └── auth.tsx             # Auth screen
│   │   ├── api/                     # API clients
│   │   │   ├── config.ts            # Product identity + API URLs
│   │   │   ├── auth.ts              # @bytelyst/auth-client
│   │   │   ├── notes.ts             # Notes API client
│   │   │   └── note-agent-actions.ts # Agent actions API client
│   │   ├── lib/                     # Platform SDK wrappers
│   │   │   └── platform.ts         # Telemetry, feature flags, kill switch, blob client
│   │   ├── store/                   # Zustand stores
│   │   │   ├── auth-store.ts
│   │   │   ├── inbox-store.ts
│   │   │   ├── workspace-store.ts
│   │   │   ├── notes-store.ts
│   │   │   └── mmkv-storage.ts      # MMKV persistent storage
│   │   └── theme/                   # Design tokens
│   ├── app.json                     # Expo config
│   └── package.json
│
├── shared/
│   └── product.json                 # Canonical product identity
│
├── docs/
│   ├── PRD.md                       # Product requirements
│   ├── ROADMAP.md                   # Master execution tracker
│   ├── ARCHITECTURE_REVIEW_AND_REUSE_ROADMAP.md
│   └── roadmaps/                    # Per-workstream roadmaps
│       ├── 00_MASTER_EXECUTION_PLAN.md
│       ├── 01_FOUNDATIONS_AND_DECISIONS.md
│       ├── 02_BACKEND_ROADMAP.md
│       ├── 03_WEB_ROADMAP.md
│       └── 04_MOBILE_ROADMAP.md
│
├── backend/Dockerfile               # Multi-stage Docker build for backend
├── web/Dockerfile                   # Multi-stage Docker build for web
├── docker-compose.yml               # Backend (4016) + web (3000)
├── scripts/docker-prep.sh           # Pack @bytelyst/* tarballs for Docker
├── .github/workflows/ci.yml         # GitHub Actions CI (backend + web + mobile)
├── AGENTS.md                        # This file
└── README.md

3. Tech Stack

Layer	Technology
Backend	Fastify 5, TypeScript ESM, Zod, jose (JWT), @bytelyst/datastore (Cosmos or memory)
Web	Next.js 16 (App Router), React 19, TailwindCSS v4, Zustand, Vitest
Mobile	React Native (Expo), TypeScript, expo-router, Zustand, MMKV
Shared packages	`@bytelyst/fastify-core`, `@bytelyst/config`, `@bytelyst/cosmos`, `@bytelyst/errors`, `@bytelyst/datastore`, `@bytelyst/api-client`, `@bytelyst/react-auth`, `@bytelyst/auth-client`, `@bytelyst/telemetry-client`, `@bytelyst/diagnostics-client`, `@bytelyst/feature-flag-client`, `@bytelyst/kill-switch-client`, `@bytelyst/platform-client`, `@bytelyst/blob-client`
Design system	`@bytelyst/design-tokens` (CSS custom properties), `@bytelyst/ui` (shared React components)
Platform	platform-service (port 4003) for auth, flags, telemetry, billing, blob
Extraction	extraction-service (port 4005) for AI-powered task extraction
Database	Azure Cosmos DB via `@bytelyst/datastore` — `productId: "notelett"`
LLM	`@bytelyst/llm` (mock/openai/azure providers), retry + timeout hardening
Tests	Vitest — 192 backend tests (32 files), 45 web tests (11 files), 50 mobile tests (10 files), 9 Playwright E2E specs

4. Coding Conventions

MUST follow

Every Cosmos document MUST include a productId: "notelett" field
Backend modules follow types.ts → repository.ts → routes.ts pattern
All repositories use @bytelyst/datastore getCollection() — never direct Cosmos SDK calls
Web engine logic in web/src/lib/ — pure TS, no React imports
Web components in web/src/components/ — React UI only
Mobile API clients in mobile/src/api/ — pure TS
Theme tokens use --nl-* CSS custom properties (web) or NoteLettTheme (native)
Commit messages: type(scope): description — types: feat, fix, docs, refactor, test, chore
Use @bytelyst/ui components (Button, Card, Badge, Toast, etc.) — never build custom equivalents
All colors via --nl-* CSS custom properties from @bytelyst/design-tokens — never hardcode hex values
Every interactive element must have aria-label or visible text label

MUST NOT do

Never use console.log in production code — use req.log or app.log in Fastify
Never use any type — use Zod inference or explicit types
Never hardcode colors — use theme tokens
Never hardcode API URLs — use env vars or config
Never hardcode product ID — use PRODUCT_ID from product-config.ts
Never modify tests to make them pass — fix the actual code
Never delete existing comments or documentation unless explicitly asked
Never add emojis to code unless explicitly asked

5. Key Design Decisions

MCP Tool Architecture

8 MCP tools: list, get, search, create_draft, update, link_notes, extract_tasks, attach_artifact
Every write tool records an agent action audit trail
All tools enforce product scope and user authentication
Dry-run, idempotency key, and correlation ID support on all write tools

Datastore Abstraction

@bytelyst/datastore provides CosmosDatastoreProvider and MemoryDatastoreProvider
DB_PROVIDER env var controls which provider is used (default: cosmos, test: memory)
All 7 repositories use getCollection() — no direct Cosmos SDK calls

Agent Action Audit Trail

Every MCP tool write operation creates a NoteAgentActionDoc record
Actions track: actorId, actorType, toolName, actionType, state, reason, before/after summaries
Supports approval workflows: draft → proposed → approved/rejected → applied

Cosmos Containers

notes (partition: /workspaceId)
workspaces (partition: /userId)
note_relationships (partition: /workspaceId)
note_tasks (partition: /workspaceId)
note_artifacts (partition: /workspaceId)
note_agent_actions (partition: /workspaceId)
saved_views (partition: /userId)
note_prompts (partition: /userId)
note_prompt_schedules (partition: /userId)
note_prompt_webhooks (partition: /userId)

6. Build & Test Commands

# ── Backend ────────────────────────────────────────
pnpm --filter @notelett/backend run dev              # Dev server (port 4016)
pnpm --filter @notelett/backend run typecheck        # tsc --noEmit
pnpm --filter @notelett/backend run test             # backend Vitest tests

# ── Web ────────────────────────────────────────────
pnpm --filter @notelett/web run dev                # Dev server (port 3000)
pnpm --filter @notelett/web run build              # Production build
pnpm --filter @notelett/web run typecheck          # tsc --noEmit
pnpm --filter @notelett/web run test               # web Vitest tests

# ── Mobile ─────────────────────────────────────────
pnpm --filter @notelett/mobile run start           # Expo dev server
pnpm --filter @notelett/mobile run typecheck       # tsc --noEmit
pnpm --filter @notelett/mobile run test            # mobile tests

# ── Full verification ──────────────────────────────
pnpm run verify

7. Backend API Endpoints

Method	Path	Description
GET/POST	`/api/notes`	List / create notes
GET/PATCH	`/api/notes/:id`	Note CRUD
POST	`/api/notes/:id/archive`	Archive note
POST	`/api/notes/:id/restore`	Restore note
POST	`/api/notes/:id/summarize`	Summarize note via extraction-service
GET	`/api/notes/export`	Export notes (JSON or Markdown)
GET	`/api/notes/search`	Search notes
GET/POST	`/api/workspaces`	List / create workspaces
GET/PATCH	`/api/workspaces/:id`	Workspace CRUD
GET/POST	`/api/note-relationships`	List / create relationships
GET/POST	`/api/note-tasks`	List / create tasks
GET/PATCH	`/api/note-tasks/:id`	Task CRUD
GET/POST	`/api/note-artifacts`	List / create artifacts
PATCH	`/api/note-artifacts/:id`	Update artifact
GET/POST	`/api/note-agent-actions`	List / create agent actions
PATCH	`/api/note-agent-actions/:id`	Update agent action state
POST	`/api/note-agent-actions/batch-review`	Batch approve/reject (up to 50)
GET/POST	`/api/saved-views`	List / create saved views
GET/PATCH/DELETE	`/api/saved-views/:id`	Saved view CRUD
POST	`/api/notes/:id/copilot`	Copilot text transform (shorten, expand, bulletize, etc.)
POST	`/api/notes/:id/suggest-title`	AI-generated title suggestion
POST	`/api/notes/:id/suggest-tags`	AI-generated tag suggestions
POST	`/api/notes/:id/check-duplicates`	Duplicate/similar note detection
POST	`/api/notes/:id/suggest-links`	Related note suggestions
POST	`/api/notes/compare`	Compare 2-5 notes via LLM
POST	`/api/notes/merge`	Merge 2-10 notes via LLM
POST	`/api/notes/chat`	Workspace RAG chat
GET/POST	`/api/note-prompts`	List / create prompt templates
GET/PATCH/DELETE	`/api/note-prompts/:id`	Template CRUD
POST	`/api/note-prompts/run`	Run a prompt template against a note
POST	`/api/note-prompts/url-extract`	Extract + summarize URL content
GET/POST	`/api/prompt-schedules`	List / create scheduled actions
GET/PATCH/DELETE	`/api/prompt-schedules/:id`	Schedule CRUD
GET	`/api/prompt-schedules/diagnostics`	Scheduler health
GET/POST	`/api/prompt-webhooks`	List / create webhook triggers
GET/PATCH/DELETE	`/api/prompt-webhooks/:id`	Webhook CRUD
POST	`/api/prompt-webhooks/:id/trigger`	Manually trigger a webhook
POST	`/api/workspaces/:wsId/knowledge-gaps`	Knowledge gap detection
GET	`/api/notes/:id/reading-time`	Reading time estimate
GET	`/health`	Health check

8. MCP Tools

Tool Name	Description	Role
`notes.notes.list`	List notes in a workspace	viewer
`notes.notes.get`	Get a single note	viewer
`notes.notes.search`	Search notes with lexical query	viewer
`notes.notes.create_draft`	Create a note draft	admin
`notes.notes.update`	Update note title/body/status/tags	admin
`notes.relationships.link`	Create typed relationship between notes	admin
`notes.tasks.extract`	Extract tasks from note body	admin
`notes.artifacts.attach`	Attach artifact to a note	admin

Cross-Repo Automation

For periodic maintenance tasks that span all ByteLyst repos (test audits, coverage gaps, dependency checks, secret scans, typecheck sweeps), see the Coding Agent Automation Playbook:

../learning_ai_common_plat/docs/devops/CODING_AGENT_AUTOMATION_PLAYBOOK.md

Key tasks: workspace hygiene sweep, cross-repo test suite, backend/web coverage gap analysis, TypeScript typecheck sweep, dependency health check, secret scan, code quality audit, AGENTS.md consistency check.

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