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Rohit Ghumare 82b04a31f5
feat: deprecate roots, sampling, and logging (SEP-2577) (#884) 
SEP-2577 deprecates the Roots, Sampling, and Logging features. The
deprecation is advisory: the features stay fully functional and there is
no wire-level change. Mark the corresponding Rust APIs as deprecated so
downstream users get compiler warnings and migration guidance.

- Forward attributes through the service `method!` macros and deprecate
  `Peer::create_message`, `Peer::list_roots`, `Peer::set_level`, and
  `Peer::notify_logging_message`.
- Forward per-field attributes through the capability `builder!` macro and
  deprecate the generated `enable_roots`, `enable_sampling`, and
  `enable_logging` builders, plus the hand-written
  `enable_roots_list_changed`, `enable_sampling_tools`, and
  `enable_sampling_context`.
- Document the deprecation on the capability types and fields, and in the
  README feature sections.
- Allow `deprecated` at the crate's own call sites so the build stays
  warning-clean, and refresh the message schema snapshots.
2026-06-04 08:43:39 -04:00
..
src feat: deprecate roots, sampling, and logging (SEP-2577) (#884) 2026-06-04 08:43:39 -04:00
tests feat: deprecate roots, sampling, and logging (SEP-2577) (#884) 2026-06-04 08:43:39 -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: reject init header/body version mismatch (#853) 2026-05-18 20:21:22 -04:00
CHANGELOG.md chore: release v1.6.1 (#831) 2026-05-13 09:36:22 -04:00
README.md feat: add local feature for !Send tool handler support (#740) 2026-03-11 17:22:56 -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.