Fast Gateway Protocol (FGP)

10-30ms response times for AI agent tool calls.

FGP is an open protocol for building low-latency daemon services that AI agents can call efficiently. Unlike stdio-based protocols that spawn a new process per invocation, FGP uses persistent UNIX sockets with NDJSON framing.

Why FGP?

Aspect	MCP (stdio)	FGP (socket)
Latency	200-500ms	10-30ms
State	Stateless	Stateful
Auth	Per-call	Shared store
Batching	None	bundle method

Quick Example

Request:

{"id":"1","v":1,"method":"gmail.list","params":{"limit":5}}

Response:

{"id":"1","ok":true,"result":{"emails":[...]},"meta":{"server_ms":12}}

Specification

See FGP-PROTOCOL.md for the complete specification.

SDKs

Language	Package	Status
Rust	fgp-daemon	Coming soon
Python	fgp-daemon-py	Coming soon
Node.js	fgp-daemon-node	Planned

Directory Structure

FGP services install to ~/.fgp/:

~/.fgp/
├── config.json              # Global configuration
├── services/                # Installed services
│   ├── gmail/
│   │   ├── manifest.json
│   │   └── daemon.sock
│   └── github/
│       ├── manifest.json
│       └── daemon.sock
├── auth/                    # Shared authentication
│   ├── google/
│   └── github/
└── logs/                    # Service logs

Required Methods

Every FGP daemon must implement:

• health - Returns status, pid, version, uptime
• stop - Graceful shutdown
• methods - Lists available methods

License

MIT