# Agent Guidelines — Mosaic Stack

## Required Load Order

1. `~/.config/mosaic/SOUL.md`
2. `~/.config/mosaic/STANDARDS.md`
3. `~/.config/mosaic/AGENTS.md`
4. `~/.config/mosaic/guides/E2E-DELIVERY.md`
5. `AGENTS.md` (this file)
6. Runtime-specific guide: `~/.config/mosaic/runtime/<runtime>/RUNTIME.md`

## Project Context

Mosaic Stack is a self-hosted, multi-user AI agent platform. TypeScript monorepo with NestJS gateway, Next.js web dashboard, Pi SDK agent runtime, and plugin architecture for Discord/Telegram.

## Package Map

| Package            | Purpose                         | Key Dependencies                 |
| ------------------ | ------------------------------- | -------------------------------- |
| `apps/gateway`     | NestJS API + WebSocket hub      | Fastify, Socket.IO, Pi SDK, OTEL |
| `apps/web`         | Next.js dashboard               | React 19, Tailwind               |
| `packages/types`   | Shared TypeScript contracts     | class-validator                  |
| `packages/db`      | Drizzle ORM schema + migrations | drizzle-orm, postgres            |
| `packages/auth`    | BetterAuth configuration        | better-auth, @mosaic/db          |
| `packages/brain`   | Data layer (PG-backed)          | @mosaic/db                       |
| `packages/queue`   | Valkey task queue + MCP         | ioredis                          |
| `packages/coord`   | Mission coordination            | @mosaic/queue                    |
| `packages/cli`     | Unified CLI + Pi TUI            | Ink, Pi SDK                      |
| `plugins/discord`  | Discord channel plugin          | discord.js                       |
| `plugins/telegram` | Telegram channel plugin         | Telegraf                         |

## Architecture Rules

1. Gateway is the single API surface — all clients connect through it
2. Pi SDK is ESM-only — gateway and CLI must use ESM
3. Socket.IO typed events defined in `@mosaic/types` enforce compile-time contracts
4. OTEL auto-instrumentation loads before NestJS bootstrap
5. BetterAuth manages auth tables; schema defined in `@mosaic/db`
6. Docker Compose provides PG (5433), Valkey (6380), OTEL Collector (4317/4318), Jaeger (16686)
7. Explicit `@Inject()` decorators required in NestJS (tsx/esbuild doesn't emit decorator metadata)

## Development Workflow

```bash
docker compose up -d          # Infrastructure
pnpm install                  # Dependencies
pnpm typecheck && pnpm lint && pnpm format:check  # Quality gates
```

## Repo-Specific Notes

- DTOs in `*.dto.ts` files at module boundaries
- ESM everywhere (`"type": "module"`, `.js` extensions in imports)
- NodeNext module resolution in all tsconfigs
- Scratchpads are mandatory for non-trivial tasks