mcp-arr AGENTS.md

AGENTS.md - mcp-arr

MCP server for the *arr media management suite (Sonarr, Radarr, Lidarr, Prowlarr).

Tech Stack

• Language: TypeScript
• Runtime: Node.js (ES modules)
• Protocol: Model Context Protocol (MCP)
• Build: TypeScript compiler (tsc)

Architecture

src/
├── index.ts          # Server entry point, tool registration
├── tools/            # Tool implementations by service
│   ├── sonarr.ts     # TV show management
│   ├── radarr.ts     # Movie management
│   ├── lidarr.ts     # Music management
│   └── prowlarr.ts   # Indexer management
└── types.ts          # Shared TypeScript types

Development Commands

# Build
npm run build

# Watch mode
npm run watch

# Test locally (requires env vars)
node dist/index.js

Environment Variables

Variable	Required	Description
SONARR_URL	For Sonarr	Base URL (e.g., http://localhost:8989)
SONARR_API_KEY	For Sonarr	API key from Sonarr settings
RADARR_URL	For Radarr	Base URL
RADARR_API_KEY	For Radarr	API key
LIDARR_URL	For Lidarr	Base URL
LIDARR_API_KEY	For Lidarr	API key
PROWLARR_URL	For Prowlarr	Base URL
PROWLARR_API_KEY	For Prowlarr	API key

Constraints

rules:
  - id: no-hardcoded-urls
    description: Never hardcode service URLs or API keys
    check: All service access via environment variables

  - id: consistent-tool-naming
    description: Tool names follow pattern {service}_{action}
    examples:
      - sonarr_get_series
      - radarr_search
      - lidarr_get_albums

  - id: error-handling
    description: All API calls must handle errors gracefully
    requirements:
      - Check for missing env vars before API call
      - Return meaningful error messages
      - Don't expose raw API errors to users

  - id: trash-guides-integration
    description: TRaSH Guides tools use embedded guide data
    note: Guide data fetched from trash-guides.info at runtime