rmcp-v1.8.0

Warning

⚠️ Breaking Changes

Despite being a minor version bump, this release contains a source-breaking API change (it should have been 2.0.0). If you depend on rmcp = "1.7", Cargo will resolve to 1.8.0 automatically and your build may fail. Pin to =1.7.x if you are not ready to migrate.

Peer::peer_info() return type changed (#862):

- pub fn peer_info(&self) -> Option<&R::PeerInfo>
+ pub fn peer_info(&self) -> Option<Arc<R::PeerInfo>>

This was needed so peer info can be re-set on a duplicate initialize (it now lives behind an RwLock), which is why a borrow can no longer be returned.

Migration: field access still works through Arc's Deref. If you need the old &InitializeResult (e.g. you bound the type explicitly), use .as_deref():

// Before (1.7.x): info is &InitializeResult
let info: Option<&InitializeResult> = client.peer_info();

// After (1.8.0): info is Arc<InitializeResult>
let info: Option<Arc<InitializeResult>> = client.peer_info();

// To recover the old reference type:
let info: Option<&InitializeResult> = client.peer_info().as_deref();

Added

• standardize resource-not-found error code (SEP-2164) (#899)
• validate OAuth authorization response issuer (#896)
• specify OIDC application_type during dynamic client registration (SEP-837) (#883)
• deprecate roots, sampling, and logging (SEP-2577) (#884)

Fixed

• (auth) preserve configured reqwest client (#917)
• (auth) align OAuth metadata discovery ordering (#887)
• align progress timeout token (#909)
• (elicitation) preserve enumNames through ElicitationSchema serde round-trip (#905)
• return tool errors for invalid arguments (#894)
• (auth) apply offline_access to reauth paths (#897)
• update peer info on duplicate initialize (#862) — ⚠️ breaking: changes the Peer::peer_info() signature, see Breaking Changes above
• strip and validate tool outputSchema and inputSchema (#860)
• remove unnecessary fields from tools' inputSchema (#856)
• reject init header/body version mismatch (#853)
• align protocol version negotiation (#855)
• accept 200 with empty body in response to notifications in addition to 202 (#849)

Other

• Allow custom HTTP clients for OAuth (#908)
• Add progress-aware request timeout reset (#858)
• (server) document Err vs Ok(CallToolResult::error) visibility contract on ServerHandler::call_tool (#854)
• refine mcpmate listing copy (#885)
• added jilebi-mcp to the list of built with rmcp (#861)

rmcp-macros-v1.8.0

Added

• deprecate roots, sampling, and logging (SEP-2577) (#884)

Fixed

• strip and validate tool outputSchema and inputSchema (#860)
• remove unnecessary fields from tools' inputSchema (#856)

Other

• refine mcpmate listing copy (#885)
• added jilebi-mcp to the list of built with rmcp (#861)

rmcp-v1.7.0

Added

• add task-based stdio examples (#839)

Fixed

• (rmcp) flatten Resource variant of PromptMessageContent (#843)
• reply -32700 on stdio parse errors instead of closing (#833)

Other

• (rmcp) remove dependency on chrono default features (#829)
• Fix/issue 817 idle timeout log level (#824)

rmcp-macros-v1.7.0

Added

• add task-based stdio examples (#839)

rmcp-v1.6.0

Added

• (http) log Host/Origin rejections (#826)
• (http) add Origin header validation (#823)
• (router) support runtime disabling of tools (#809)
• optional session store (resumabillity support) (#775)

Fixed

• add init_timeout for streamable-http sessions (#811)
• (http) fall back to :authority for HTTP/2 (#827)
• (docs) use correct Parameters syntax in tool examples (#814)

Other

• add systemprompt-template to Built with rmcp (#820)

rmcp-macros-v1.6.0

Fixed

• (docs) use correct Parameters syntax in tool examples (#814)

Other

• add systemprompt-template to Built with rmcp (#820)

rmcp-v1.5.0

Added

• (transport) add constructors for non_exhaustive error types (#806)
• add 2025-11-25 protocol version support (#802)

Fixed

• treat resource metadata JSON parse failure as soft error (#810)
• include http_request_id in request-wise priming event IDs (#799)
• (http) drain SSE stream for connection reuse (#790)

Other

• (deps) update which requirement from 7 to 8 (#807)

rmcp-macros-v1.5.0

Fixed

• (macros) respect local feature in #[prompt] macro — omit + Send bound (#803)

rmcp-v1.4.0

Added

• add Default and constructors to ServerSseMessage (#794)
• add meta to elicitation results (#792)
• (macros) auto-generate get_info and default router (#785)
• (transport) add which_command for cross-platform executable resolution (#774)
• (auth) add StoredCredentials::new() constructor (#778)

Fixed

• (server) remove initialized notification gate to support Streamable HTTP (#788)
• default session keep_alive to 5 minutes (#780)
• (http) add host check (#764)
• exclude local feature from docs.rs build (#782)

Other

• update Rust toolchain to 1.92 (#797)
• unify IntoCallToolResult Result impls (#787)

rmcp-macros-v1.4.0

Added

• (macros) auto-generate get_info and default router (#785)