# AGENTS.md - AI Coding Agent Guidelines

Guidelines for AI agents working in this Bun monorepo.

## Product Vision

> **Kairos 是一个人生操作系统（Personal Life OS）。所有开发决策必须服务于这个愿景。**

Kairos 将个人生活的每一个维度 —— 财务、订阅、健康、资产、决策 —— 整合进一个统一的、自托管的平台。

### 设计信条

1. **数据主权** —— 自托管、本地优先。用户数据不离开用户的机器，除非用户自己决定。
2. **关联即洞察** —— 孤立数据是噪音，关联数据是洞察。所有模块共享统一数据层。
3. **可扩展基座** —— 架构必须支持模块的独立扩展和自定义。

### Agent 决策指南

- **这是否让用户更完整地掌控自己的数据？** 如果否，重新考虑。
- **这个模块的数据是否可以被其他模块关联使用？** 如果不能，说明数据模型设计有问题。
- **这个功能是否可以在完全离线/自托管环境下工作？** 如果不能，必须提供无外部依赖的替代方案。
- **新增的功能是否通过 ORPC 契约暴露？** Web 和 CLI 必须能同等访问所有能力。

## Project Overview

> **This project uses [Bun](https://bun.sh) exclusively as both the JavaScript runtime and package manager. Do NOT use Node.js / npm / yarn / pnpm. Always prefer `bun run <script>` over `bun <script>` to avoid conflicts with Bun built-in subcommands. Never use `npm`, `npx`, or `node`.**

- **Monorepo**: Bun workspaces + Turborepo orchestration
- **Runtime**: Bun (see `mise.toml` for version) — **NOT Node.js**
- **Package Manager**: Bun — **NOT npm / yarn / pnpm**
- **Apps**: `apps/server` — TanStack Start fullstack web app (see `apps/server/AGENTS.md`)
- **Packages**: `packages/tsconfig` — shared TS configs

## Build / Lint / Test Commands

```bash
# Root (via Turbo)
bun run dev              # Start all apps in dev mode
bun run build            # Build all apps
bun run compile          # Compile server to standalone binary
bun run fix              # Lint + format (Biome auto-fix)
bun run typecheck        # TypeScript check across monorepo

# Database (in apps/server) — ALWAYS use migration workflow, never db:push
bun run db:auth          # Regenerate Better Auth schema (after upgrading better-auth)
bun run db:generate      # Generate migrations from schema changes
bun run db:migrate       # Run pending migrations
bun run db:studio        # Open Drizzle Studio

# Server CLI (in apps/server)
bun run cli auth reset-password   # Reset owner password

# Testing (not yet configured)
bun test path/to/test.ts # Run single test file
```

## Code Style (TypeScript)

### Formatting (Biome)
- **Indent**: 2 spaces | **Line width**: 120 | **Line endings**: LF
- **Quotes**: Single `'` | **Semicolons**: Omit (ASI)
- **Arrow parentheses**: Always `(x) => x`

### Imports
Biome auto-organizes. Order: 1) External packages → 2) Internal `@/*` aliases → 3) Type imports (`import type { ... }`)

### TypeScript Strictness
- `strict: true`, `noUncheckedIndexedAccess: true`, `verbatimModuleSyntax: true`
- Use `@/*` path aliases (maps to `src/*`)

### Naming Conventions
| Type | Convention | Example |
|------|------------|---------|
| Files (utils) | kebab-case | `auth-utils.ts` |
| Files (components) | PascalCase | `UserProfile.tsx` |
| Components | PascalCase arrow | `const Button = () => {}` |
| Functions | camelCase | `getUserById` |
| Constants | UPPER_SNAKE | `MAX_RETRIES` |
| Types/Interfaces | PascalCase | `UserProfile` |
| Drizzle tables | camelCase, no suffix | `user`, `category` (NOT `userTable`) |

### React Patterns
- Components: arrow functions (enforced by Biome)
- Data fetching: `useSuspenseQuery(orpc.feature.list.queryOptions())`
- Let React Compiler handle memoization (no manual `useMemo`/`useCallback`)

### Error Handling
- Use `try-catch` for async operations; throw descriptive errors
- ORPC: Use `ORPCError` with proper codes (`NOT_FOUND`, `UNAUTHORIZED`, `INTERNAL_SERVER_ERROR`)
- Never use empty catch blocks

## Database (Drizzle ORM + postgres-js)

- **ORM**: Drizzle ORM `0.45.x` (stable)
- **Driver**: `drizzle-orm/postgres-js` (NOT `bun-sql`)
- **Validation**: `drizzle-zod` (separate package, NOT `drizzle-orm/zod`)
- **Relations**: Defined via `relations()` from `drizzle-orm` — callback syntax
- **Query style**: `db.query.tableName.findMany({ where: (t, { eq }) => eq(t.col, val), orderBy: (t, { asc }) => asc(t.col) })`
- **Auth schema**: Generated by Better Auth CLI (`bun run db:auth`), **never hand-edit**
- **Schema re-export**: `db/schema/index.ts` selectively exports tables only (not relations) from auth schema
- **Migration workflow**: Always `db:generate` → `db:migrate`. **Never** use `db:push`.

## Environment Variables

- Use `@t3-oss/env-core` with Zod validation in `src/env.ts`
- Server vars: no prefix | Client vars: `VITE_` prefix required
- Never commit `.env` files

## Dependency Management

- All versions centralized in root `package.json` `catalog` field
- Workspace packages use `"catalog:"` — never hardcode versions
- Internal packages use `"workspace:*"` references

## Development Principles

1. **No backward compatibility** — Always use the latest API and patterns. Never keep deprecated code paths.
2. **Always sync documentation** — When code changes, immediately update `AGENTS.md` and related docs.
3. **Forward-only migration** — When upgrading dependencies, fully adopt the new API.

## Critical Rules

**DO:**
- Run `bun run fix` before committing
- Use `@/*` path aliases (not relative imports)
- Include `createdAt`/`updatedAt` on all tables
- Use `catalog:` for dependency versions

**DON'T:**
- Use `npm`, `npx`, `node`, `yarn`, `pnpm` — always use `bun` / `bunx`
- Edit `src/routeTree.gen.ts` (auto-generated)
- Use `as any`, `@ts-ignore`, `@ts-expect-error`
- Commit `.env` files
- Use empty catch blocks `catch(e) {}`
- Hardcode dependency versions in workspace packages
- Leave docs out of sync with code changes

## Directory Structure

```
.
├── apps/
│   └── server/              # TanStack Start fullstack app (see apps/server/AGENTS.md)
├── packages/
│   └── tsconfig/            # Shared TS configs
├── biome.json               # Linting/formatting config
├── turbo.json               # Turbo task orchestration
└── package.json             # Workspace root + dependency catalog
```

## See Also

- `apps/server/AGENTS.md` — Detailed server app architecture, ORPC patterns, UI conventions