arca-mcp

MCP server for ARCA (Agencia de Recaudacion y Control Aduanero) - provides tools via stdio transport.

Installation

bun install

Related MCP server: keycae-mcp

Usage

# Start the server
bun run start

# Type check (no emission due to noEmit: true in tsconfig)
bun tsc

Environment Variables

Required for AFIP authentication (WS-AAA):

• ARCA_WSAA_CERT: Certificate file (default: ghf.crt)

• ARCA_WSAA_PRIVATE_KEY: Private key file (default: ghf.key)

• ARCA_WSAA_PASSWORD: Private key password (default: empty)

• ARCA_TEST_MODE: Set to false for production; any other value (or unset) uses homologation

• ARCA_FETCH_LIMIT: SOAP retry attempts (default: 3)

Certificate and key files are expected in the current directory (or currentDir tool parameter).

Important Notes

• CUIT format: All tools require CUIT in XX-XXXXXXXX-X format (validated via Zod)

• WSDL caching: WSDL files are downloaded to ./{service}_{env}.wsdl (e.g., wsfe_test.wsdl) and reused for 1 year

• OpenSSL required: The signTra function uses openssl cms for signing; ensure OpenSSL is installed and in PATH

• SOAP services: Communicates with AFIP's WS-FE (electronic invoicing) and WSAA (authentication) services

• Temp files: Creates TRA_*.xml and TA_*.xml files in the directory specified by currentDir (default: ./)

• TypeScript: Strict type checking enabled; moduleResolution: bundler (Bun-specific)

Project Structure

src/
├── main.ts           # Entry point
├── tool.ts           # MCP tool definitions (AFIP service wrappers)
├── arcaService.ts    # SOAP client implementation
└── interface.ts      # Unused (empty)

Development Notes

• No test framework configured; manual testing via MCP tools recommended

• No lint/formatter config in repo (though .gitignore references ESLint/Prettier)

• Uses Bun's built-in test runner? Not configured

• WSDL downloads occur on first use or when cached file >1 year old

License

MIT