Question 1

How do I switch between different schema versions?

Accepted Answer

Enable the corresponding Cargo feature in your `Cargo.toml`. For example, `features = ["2025_06_18"]` uses the 2025-06-18 schema. Multiple versions can be enabled simultaneously; non-default versions are available under explicitly named modules (e.g., `rust_mcp_schema::mcp_2025_06_18`).

Question 2

Does this crate provide a full MCP server or client implementation?

Accepted Answer

No. This crate only implements the MCP schema (types, serialization, deserialization). For a high‑performance asynchronous toolkit to build servers and clients, see `rust-mcp-sdk`, which is built on top of this schema.

Question 3

What are the runtime requirements?

Accepted Answer

The crate relies on `serde` and `serde_json` for JSON serialization. No external runtime (e.g., Tokio) is required unless you add a transport layer. The schema itself is pure data structures.

Model Context Protocol (MCP) Schema For Rust MCP Server

What is the Model Context Protocol (MCP) Schema For Rust MCP Server?

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