rig-mcp

Model Context Protocol bridge for rig-compose tool registries, backed by the official rmcp SDK.

Install

[dependencies]
rig-compose = "0.1"
rig-mcp     = "0.1"

What you get

• McpTransport — trait abstracting client transports.
• LoopbackTransport — in-process round-trip against a local ToolRegistry. Useful for tests and embedding.
• StdioTransport::spawn / StdioClient — newline-framed JSON-RPC over a child process's stdio.
• serve_stdio() — exposes any ToolRegistry as an MCP server endpoint.
• McpTool — adapts a transport into a rig_compose::Tool, so the same skill chain works against local and remote tools indistinguishably.

All spec-level concerns (JSON-RPC framing, capability handshakes, protocol-version negotiation) are delegated to rmcp; this crate keeps the adapter surface small.

Rust version

The crate targets Rust 1.88 (edition 2024). MSRV bumps follow the Rig contributing policy and ship as a feat!: change.

License

Dual-licensed under either of:

• MIT license (LICENSE-MIT or https://opensource.org/licenses/MIT)
• Apache License, Version 2.0 (LICENSE-APACHE or https://www.apache.org/licenses/LICENSE-2.0)

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual-licensed as above, without any additional terms or conditions.