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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project Overview
+
+Copilot Auto-Responder — a Next.js 14 app (App Router) that provides automatic message responses for the Copilot messages app based on the Setting that the workspace users set. It runs as an embedded app within Copilot workspaces inside an iframe, allowing workspace internal users to configure auto-responses to client messages (always on, outside working hours, or off).
+
+When a message is sent to the Copilot messages app that falls in one of the auto-response settings, the webhook is triggered and the message is processed. The automatic message is then sent to the Copilot messages app via copilotApiUtils#sendMessage.
+
+## Commands
+
+```bash
+yarn dev              # Start dev server
+yarn build            # Build for production
+yarn lint:check       # ESLint check
+yarn lint:fix         # ESLint auto-fix
+yarn prettier:check   # Prettier check
+yarn prettier:fix     # Prettier auto-fix
+yarn db:migrate       # Run Prisma migrations (uses .env.development.local)
+yarn db:seed          # Seed/resolve initial migration
+```
+
+Vercel build runs `prisma generate && next build`. Husky pre-commit runs `lint-staged` (lint:fix + prettier:fix on staged `src/**/*.{ts,tsx}`).
+
+## Architecture
+
+### Data Flow
+
+1. **Settings UI** (`src/app/page.tsx` — server component) renders the `AutoResponder` client component with current settings. This is where settings can be configured.
+2. **Save** uses a server action that calls `SettingService.save()` to persist to PostgreSQL via Prisma
+3. **Webhook** (`POST /api/messages/webhook`) receives `message.sent` events from Copilot, validates HMAC signature, then `MessageService` decides whether to auto-respond based on the workspace's settings
+4. **Rate limiting**: at most one auto-response per hour per channel per client, tracked in the `Message` table
+
+### Key Services
+
+- **`SettingService`** (`src/app/api/settings/services/setting.service.ts`) — CRUD for workspace auto-responder settings (one Setting row per workspace)
+- **`MessageService`** (`src/app/api/messages/services/message.service.ts`) — webhook handler logic: checks setting type (ENABLED/DISABLED/OUTSIDE_WORKING_HOURS), rate-limits, and sends auto-responses
+- **`CopilotAPI`** (`src/utils/copilotApiUtils.ts`) — wrapper around `copilot-node-sdk` for workspace/client/user/message API calls. DO NOT USE copilot-node-sdk directly. This is where the auto-response is sent to the Copilot messages app.
+
+### Database (Prisma + PostgreSQL/Neon)
+
+Schema in `schema.prisma` (root). Two models:
+- **Setting** — one per workspace: type (ENABLED/DISABLED/OUTSIDE_WORKING_HOURS), timezone, workingHours (JSONB), message text, senderId. This is used to configure the automatic response settings.
+- **Message** — log of sent auto-responses, used for hourly rate-limiting per channel/client. This is used to track the auto-response rate-limiting.
+
+Prisma client is a singleton via `src/lib/db.ts`.
+
+### Working Hours Logic
+
+Uses `@js-joda/core` + `@js-joda/timezone` for timezone-aware day/time comparisons (`src/utils/common.ts:isWithinWorkingHours`). Working hours stored as array of `{weekday, startTime, endTime}` in JSONB.
+
+### API Routes
+
+- `POST /api/messages/webhook` — Copilot webhook receiver (signature-verified)
+- `GET /api/internal-users` — proxies internal user list from Copilot API
+- `GET /api/health-check` — Health endpoint
+
+### Frontend
+
+- `AutoResponder` component (`src/app/components/AutoResponder.tsx`) — main form using React Hook Form + Zod validation
+- UI: Tailwind CSS + MUI Select + Radix UI Select + react-timezone-select
+- Form validation: response 10–2000 chars, at least 1 day selected for outside-working-hours mode
+
+### Auth & Multi-tenancy
+
+Token-based via `?token=` query param from Copilot embedding. `CopilotAPI` uses both an API key (`COPILOT_API_KEY`) and the session token. Workspace ID from the token payload scopes all data.
+
+We can use `getTokenPayload` from CopilotAPI to get the payload encoded in token
+
+## Code Conventions
+
+- Path aliases: `@/` maps to `src/`
+- Prettier: single quotes, trailing commas, 125 char width
+- Zod schemas colocated with types in `src/types/` — all API responses validated at parse time
+- Environment config centralized in `src/config/app.ts`
+- SVGs imported as React components via `next-plugin-svgr`
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+AGENTS.md
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