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Filename Latest commit message Latest commit date
Dale Seo 0dea39d101
 fix!: preserve OAuth discovery transport errors (#1069) 
* fix(auth): preserve OAuth discovery transport errors

* refactor!: expose domain-specific boxed OAuth HTTP errors

Let custom OAuth HTTP clients preserve native error types and source chains
while keeping the type-erased boundary explicit in the public API.

BREAKING CHANGE: OAuthHttpClientError is now a boxed error alias; custom
clients should return native errors with .into() or box them directly.

---------

Co-authored-by: Theodore Ni <3806110+tjni@users.noreply.github.com>
2026-07-28 11:38:39 -04:00
..
src fix!: preserve OAuth discovery transport errors (#1069) 2026-07-28 11:38:39 -04:00
tests fix: gate client handler bounds for local (#1068) 2026-07-28 11:02:32 -04:00
build.rs chore: add pre-commit hook for conventional commit verification (#619) 2026-01-14 16:01:28 -05:00
Cargo.toml fix: gate client handler bounds for local (#1068) 2026-07-28 11:02:32 -04:00
CHANGELOG.md chore: release v3.0.0-beta.4 (#1061) 2026-07-28 10:32:31 -04:00
README.md docs: update for 2026-07-28 version (#1032) 2026-07-23 13:55:40 -04:00

README.md

rmcp

Crates.io Documentation

The official Rust SDK for the Model Context Protocol. Build MCP servers that expose tools, resources, and prompts to AI assistants — or build clients that connect to them.

For getting started, usage guides, and full MCP feature documentation (resources, prompts, sampling, roots, logging, completions, subscriptions, etc.), see the main README.

Feature Flags

Feature Description Default
server Server functionality and the tool system ✅
client Client functionality
macros #[tool] / #[prompt] macros (re-exports rmcp-macros) ✅
schemars JSON Schema generation for tool definitions
auth OAuth 2.0 authentication support
elicitation Elicitation support

Transport features

Feature Description
transport-io Server-side stdio transport
transport-child-process Client-side stdio transport (spawns a child process)
transport-async-rw Generic async read/write transport
transport-streamable-http-client Streamable HTTP client (transport-agnostic)
transport-streamable-http-client-reqwest Streamable HTTP client with default reqwest backend
transport-streamable-http-server Streamable HTTP server transport

TLS backend options (for HTTP transports)

Feature Description
reqwest Uses rustls — pure Rust TLS (recommended default)
reqwest-native-tls Uses platform-native TLS (OpenSSL / Secure Transport / SChannel)
reqwest-tls-no-provider Uses rustls without a default crypto provider (bring your own)

Transports

The transport layer is pluggable. Two built-in pairs cover the most common cases:

Client Server
stdio TokioChildProcess stdio
Streamable HTTP StreamableHttpClientTransport StreamableHttpService

Any type that implements the Transport trait can be used. The IntoTransport helper trait provides automatic conversions from:

  1. (Sink, Stream) or a combined Sink + Stream
  2. (AsyncRead, AsyncWrite) or a combined AsyncRead + AsyncWrite
  3. A Worker implementation
  4. A Transport implementation directly

License

This project is licensed under the terms specified in the repository's LICENSE file.