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Michael Bolin 83961e0299 feat: introduce mcp-types crate (#787 )

This adds our own `mcp-types` crate to our Cargo workspace. We vendor in
the
[`2025-03-26/schema.json`](https://github.com/modelcontextprotocol/modelcontextprotocol/blob/05f204513641c05bd78d056791af99c6c84520fa/schema/2025-03-26/schema.json)
from the MCP repo and introduce a `generate_mcp_types.py` script to
codegen the `lib.rs` from the JSON schema.

Test coverage is currently light, but I plan to refine things as we
start making use of this crate.

And yes, I am aware that
https://github.com/modelcontextprotocol/rust-sdk exists, though the
published https://crates.io/crates/rmcp appears to be a competing
effort. While things are up in the air, it seems better for us to
control our own version of this code.

Incidentally, Codex did a lot of the work for this PR. I told it to
never edit `lib.rs` directly and instead to update
`generate_mcp_types.py` and then re-run it to update `lib.rs`. It
followed these instructions and once things were working end-to-end, I
iteratively asked for changes to the tests until the API looked
reasonable (and the code worked). Codex was responsible for figuring out
what to do to `generate_mcp_types.py` to achieve the requested test/API
changes.

2025-05-02 13:33:14 -07:00

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mcp-types

Types for Model Context Protocol. Inspired by https://crates.io/crates/lsp-types.

As documented on https://modelcontextprotocol.io/specification/2025-03-26/basic:

TypeScript schema is the source of truth: https://github.com/modelcontextprotocol/modelcontextprotocol/blob/main/schema/2025-03-26/schema.ts
JSON schema is amenable to automated tooling: https://github.com/modelcontextprotocol/modelcontextprotocol/blob/main/schema/2025-03-26/schema.json

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mcp-types

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