rmcp 3.2.0

Rust SDK for Model Context Protocol
Documentation 
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# Changelog

All notable changes to this project will be documented in this file.

The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).

## [Unreleased]

## [3.2.0](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v3.1.4...rmcp-v3.2.0) - 2026-08-31

### Added

- *(auth)* coordinate OAuth refreshes through credential stores ([#1232](https://github.com/modelcontextprotocol/rust-sdk/pull/1232))
- add request-state key rotation ([#1128](https://github.com/modelcontextprotocol/rust-sdk/pull/1128))

### Fixed

- keep initialize on legacy protocol versions ([#1228](https://github.com/modelcontextprotocol/rust-sdk/pull/1228))
- *(transport)* fall back after sessionless HTTP discover rejections ([#1211](https://github.com/modelcontextprotocol/rust-sdk/pull/1211))
- allow concurrent streamable http requests ([#1186](https://github.com/modelcontextprotocol/rust-sdk/pull/1186))

## [3.1.4](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v3.1.3...rmcp-v3.1.4) - 2026-08-18

### Fixed

- *(rmcp)* preserve elicitation requestedSchema $schema dialect ([#1176](https://github.com/modelcontextprotocol/rust-sdk/pull/1176))
- harden signing key handling ([#1166](https://github.com/modelcontextprotocol/rust-sdk/pull/1166))
- report pre-init metadata errors ([#1160](https://github.com/modelcontextprotocol/rust-sdk/pull/1160))

## [3.1.3](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v3.1.2...rmcp-v3.1.3) - 2026-08-17

### Fixed

- *(auth)* ignore query parameters when matching resources ([#1177](https://github.com/modelcontextprotocol/rust-sdk/pull/1177))
- *(auth)* retain state until issuer validation ([#1167](https://github.com/modelcontextprotocol/rust-sdk/pull/1167))
- *(model)* preserve elicitation property order metadata ([#1150](https://github.com/modelcontextprotocol/rust-sdk/pull/1150))
- time out auto discovery probe ([#1149](https://github.com/modelcontextprotocol/rust-sdk/pull/1149))
- *(client)* classify discover outcome at source, not at the error type ([#1133](https://github.com/modelcontextprotocol/rust-sdk/pull/1133))

### Other

- Fix typo in to_authorized_http_client doc comment ([#1158](https://github.com/modelcontextprotocol/rust-sdk/pull/1158))

## [3.1.2](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v3.1.1...rmcp-v3.1.2) - 2026-08-07

### Fixed

- *(auth)* map 401/403 challenges on the SSE GET stream ([#1152](https://github.com/modelcontextprotocol/rust-sdk/pull/1152))
- *(sse)* loop instead of recursing when skipping SSE events ([#1146](https://github.com/modelcontextprotocol/rust-sdk/pull/1146))
- *(auth)* preserve issuer trailing slash during discovery ([#1145](https://github.com/modelcontextprotocol/rust-sdk/pull/1145))

## [3.1.1](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v3.1.0...rmcp-v3.1.1) - 2026-08-05

### Fixed

- emit cache hints from handler macros ([#1120](https://github.com/modelcontextprotocol/rust-sdk/pull/1120))
- expose MRTR state to tool handlers ([#1104](https://github.com/modelcontextprotocol/rust-sdk/pull/1104))
- disambiguate input-required results ([#1103](https://github.com/modelcontextprotocol/rust-sdk/pull/1103))

### Other

- make async-trait optional ([#1119](https://github.com/modelcontextprotocol/rust-sdk/pull/1119))

## [3.1.0](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v3.0.1...rmcp-v3.1.0) - 2026-07-31

### Added

- classify authorization-required errors ([#1056](https://github.com/modelcontextprotocol/rust-sdk/pull/1056))
- add strict stateless protocol metadata validation ([#1091](https://github.com/modelcontextprotocol/rust-sdk/pull/1091))
- SEP-2260 stream-based enforcement of client receive-side request association ([#1055](https://github.com/modelcontextprotocol/rust-sdk/pull/1055))

### Fixed

- *(model)* decode metadata-bearing input-required results affecting mrtr ([#1097](https://github.com/modelcontextprotocol/rust-sdk/pull/1097))
- require metadata for modern HTTP requests ([#1089](https://github.com/modelcontextprotocol/rust-sdk/pull/1089))
- honor supported_protocol_versions when negotiating initialize ([#1093](https://github.com/modelcontextprotocol/rust-sdk/pull/1093))

### Other

- document the ping utility with examples ([#1106](https://github.com/modelcontextprotocol/rust-sdk/pull/1106))
- complete Tier 1 feature docs and finalize roadmap ([#1101](https://github.com/modelcontextprotocol/rust-sdk/pull/1101))
- *(conformance)* meeting requirements for tier 1 ([#1087](https://github.com/modelcontextprotocol/rust-sdk/pull/1087))

## [3.0.1](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v3.0.0...rmcp-v3.0.1) - 2026-07-29

### Fixed

- *(auth)* use discovered resource for token refresh ([#1084](https://github.com/modelcontextprotocol/rust-sdk/pull/1084))
- return header mismatch for missing protocol header ([#1083](https://github.com/modelcontextprotocol/rust-sdk/pull/1083))
- negotiate stateless initialize versions ([#1080](https://github.com/modelcontextprotocol/rust-sdk/pull/1080))
- stamp server info on graceful subscription results ([#1078](https://github.com/modelcontextprotocol/rust-sdk/pull/1078))

## [3.0.0](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v3.0.0-beta.5...rmcp-v3.0.0) - 2026-07-28

### Fixed

- recognize 2026 MCP methods ([#1076](https://github.com/modelcontextprotocol/rust-sdk/pull/1076))

## [3.0.0-beta.5](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v3.0.0-beta.4...rmcp-v3.0.0-beta.5) - 2026-07-28

### Fixed

- [**breaking**] remove server_info from DiscoverResult ([#1065](https://github.com/modelcontextprotocol/rust-sdk/pull/1065))
- preserve transient OAuth discovery HTTP errors ([#1071](https://github.com/modelcontextprotocol/rust-sdk/pull/1071))
- [**breaking**] preserve OAuth discovery transport errors ([#1069](https://github.com/modelcontextprotocol/rust-sdk/pull/1069))
- gate client handler bounds for local ([#1068](https://github.com/modelcontextprotocol/rust-sdk/pull/1068))

### Other

- prepare for stable 3.0 release ([#1073](https://github.com/modelcontextprotocol/rust-sdk/pull/1073))
- RFC 9728 resource is used instead of base url when possible ([#962](https://github.com/modelcontextprotocol/rust-sdk/pull/962))
- [**breaking**] remove deprecated v3 APIs ([#1066](https://github.com/modelcontextprotocol/rust-sdk/pull/1066))

## [3.0.0-beta.4](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v3.0.0-beta.3...rmcp-v3.0.0-beta.4) - 2026-07-28

### Fixed

- accept namespaced discovery server information ([#1044](https://github.com/modelcontextprotocol/rust-sdk/pull/1044))

### Other

- *(deps)* update base64 requirement from 0.22 to 0.23 ([#1059](https://github.com/modelcontextprotocol/rust-sdk/pull/1059))
- *(deps)* update jsonwebtoken requirement from 10 to 11 ([#1058](https://github.com/modelcontextprotocol/rust-sdk/pull/1058))

## [3.0.0-beta.3](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v3.0.0-beta.2...rmcp-v3.0.0-beta.3) - 2026-07-27

### Fixed

- [**breaking**] reject missing `issuer` in authorization server metadata by default ([#1054](https://github.com/modelcontextprotocol/rust-sdk/pull/1054))
- default to allowing missing `issuer` ([#1051](https://github.com/modelcontextprotocol/rust-sdk/pull/1051))

### Other

- make oauth discovery reactive ([#1052](https://github.com/modelcontextprotocol/rust-sdk/pull/1052))

## [3.0.0-beta.2](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v3.0.0-beta.1...rmcp-v3.0.0-beta.2) - 2026-07-24

### Added

- expose oauth discovery metadata source ([#1041](https://github.com/modelcontextprotocol/rust-sdk/pull/1041))

### Fixed

- [**breaking**] omit resultType for legacy protocol sessions ([#1038](https://github.com/modelcontextprotocol/rust-sdk/pull/1038))

### Other

- declare and check MSRV ([#1034](https://github.com/modelcontextprotocol/rust-sdk/pull/1034))

## [3.0.0-beta.1](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v2.2.0...rmcp-v3.0.0-beta.1) - 2026-07-23

### Added

- route SEP-2260 associated server requests to the originating SSE stream ([#1029](https://github.com/modelcontextprotocol/rust-sdk/pull/1029))
- [**breaking**] add distributed SSE event store ([#1024](https://github.com/modelcontextprotocol/rust-sdk/pull/1024))
- add client-side TTL-honoring response cache (SEP-2549) ([#1025](https://github.com/modelcontextprotocol/rust-sdk/pull/1025))
- [**breaking**] Implement SEP-2663 Tasks Extension ([#1020](https://github.com/modelcontextprotocol/rust-sdk/pull/1020))
- add subscription listen streams (SEP-2575) ([#1000](https://github.com/modelcontextprotocol/rust-sdk/pull/1000))
- *(auth)* bind DCR client credentials to issuing authorization server (SEP-2352) ([#998](https://github.com/modelcontextprotocol/rust-sdk/pull/998))
- add modern client lifecycle modes (SEP-2575) ([#995](https://github.com/modelcontextprotocol/rust-sdk/pull/995))
- *(auth)* accumulate client-side scopes during step-up authorization ([#888](https://github.com/modelcontextprotocol/rust-sdk/pull/888))
- [**breaking**] add server discovery and negotiation (SEP-2575) ([#973](https://github.com/modelcontextprotocol/rust-sdk/pull/973))
- *(conformance)* add SEP-2243 header validation tool ([#997](https://github.com/modelcontextprotocol/rust-sdk/pull/997))
- [**breaking**] align metadata models with draft schema ([#993](https://github.com/modelcontextprotocol/rust-sdk/pull/993))
- [**breaking**] implement SEP-2549 cache hints ([#889](https://github.com/modelcontextprotocol/rust-sdk/pull/889))
- [**breaking**] add MRTR behavior support (SEP-2322) ([#929](https://github.com/modelcontextprotocol/rust-sdk/pull/929))
- [**breaking**] type Annotations.lastModified as a string ([#956](https://github.com/modelcontextprotocol/rust-sdk/pull/956))
- [**breaking**] add SEP-2243 HTTP standard headers ([#907](https://github.com/modelcontextprotocol/rust-sdk/pull/907))
- relax outputSchema to accept non-object JSON Schema types (SEP-2106) ([#895](https://github.com/modelcontextprotocol/rust-sdk/pull/895))
- [**breaking**] relax tool result structuredContent type (SEP-2106) ([#933](https://github.com/modelcontextprotocol/rust-sdk/pull/933))
- [**breaking**] add MRTR model types (SEP-2322) ([#915](https://github.com/modelcontextprotocol/rust-sdk/pull/915))

### Fixed

- reap completed response send tasks ([#1026](https://github.com/modelcontextprotocol/rust-sdk/pull/1026))
- accept stringified numeric response IDs ([#1021](https://github.com/modelcontextprotocol/rust-sdk/pull/1021))
- re-register after auth server change ([#1011](https://github.com/modelcontextprotocol/rust-sdk/pull/1011))
- .with_stateful_mode -> .with_legacy_session_mode ([#1015](https://github.com/modelcontextprotocol/rust-sdk/pull/1015))
- preserve negotiated progress responses ([#1005](https://github.com/modelcontextprotocol/rust-sdk/pull/1005))
- *(server)* serve draft-version requests statelessly per SEP-2567 ([#999](https://github.com/modelcontextprotocol/rust-sdk/pull/999))
- pass client header conformance ([#1012](https://github.com/modelcontextprotocol/rust-sdk/pull/1012))
- *(auth)* add an SDK path for pre-registered OAuth clients ([#994](https://github.com/modelcontextprotocol/rust-sdk/pull/994))
- *(transport)* cancel in-flight request on stateless streamable-HTTP client disconnect ([#857](https://github.com/modelcontextprotocol/rust-sdk/pull/857)) ([#967](https://github.com/modelcontextprotocol/rust-sdk/pull/967))
- *(auth)* distinguish rejected refresh tokens from transient failures ([#963](https://github.com/modelcontextprotocol/rust-sdk/pull/963))
- *(auth)* validate discovered metadata issuer ([#996](https://github.com/modelcontextprotocol/rust-sdk/pull/996))
- bound streamable HTTP memory usage ([#970](https://github.com/modelcontextprotocol/rust-sdk/pull/970))
- *(streamable-http)* preserve progress in JSON mode ([#990](https://github.com/modelcontextprotocol/rust-sdk/pull/990))
- specify compatible sse-stream version ([#968](https://github.com/modelcontextprotocol/rust-sdk/pull/968))
- flag schema derive on schemars feature ([#966](https://github.com/modelcontextprotocol/rust-sdk/pull/966))

### Other

- refactor OAuth client authorization api ([#1009](https://github.com/modelcontextprotocol/rust-sdk/pull/1009))
- update for 2026-07-28 version ([#1032](https://github.com/modelcontextprotocol/rust-sdk/pull/1032))
- *(deps)* update hmac requirement from 0.12 to 0.13 ([#988](https://github.com/modelcontextprotocol/rust-sdk/pull/988))
- serialize JavaScript dependency install ([#972](https://github.com/modelcontextprotocol/rust-sdk/pull/972))

### Changed

- **BREAKING**: rename `StreamableHttpServerConfig::stateful_mode` to `legacy_session_mode` (and the builder `with_stateful_mode` to `with_legacy_session_mode`) to clarify that the option only affects legacy protocol versions (`< 2026-07-28`); per SEP-2567 the `2026-07-28` draft version is always served statelessly ([#999](https://github.com/modelcontextprotocol/rust-sdk/pull/999))

### Fixed

- use the authorization server issuer as the default `private_key_jwt` audience

## [2.2.0](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v2.1.0...rmcp-v2.2.0) - 2026-07-08

### Added

- reject auth servers lacking S256 PKCE support ([#955](https://github.com/modelcontextprotocol/rust-sdk/pull/955))

### Fixed

- pass client conformance suite ([#960](https://github.com/modelcontextprotocol/rust-sdk/pull/960))
- don't respond to cancelled requests ([#957](https://github.com/modelcontextprotocol/rust-sdk/pull/957))
- fail orphaned streamable HTTP responses on reinit ([#914](https://github.com/modelcontextprotocol/rust-sdk/pull/914))
- address 2025-11-25 conformance audit findings ([#951](https://github.com/modelcontextprotocol/rust-sdk/pull/951))

## [2.1.0](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v2.0.0...rmcp-v2.1.0) - 2026-07-02

### Added

- add SEP-414 trace context meta accessors ([#910](https://github.com/modelcontextprotocol/rust-sdk/pull/910))
- add SEP-2575 meta helpers ([#942](https://github.com/modelcontextprotocol/rust-sdk/pull/942))

### Fixed

- *(transport)* make AsyncRwTransport::receive cancel-safe ([#941](https://github.com/modelcontextprotocol/rust-sdk/pull/941)) ([#947](https://github.com/modelcontextprotocol/rust-sdk/pull/947))
- *(auth)* preserve refresh_token when refresh response omits it ([#949](https://github.com/modelcontextprotocol/rust-sdk/pull/949))
- block redirect header leaks ([#936](https://github.com/modelcontextprotocol/rust-sdk/pull/936))
- don't respond to unparsable messages ([#940](https://github.com/modelcontextprotocol/rust-sdk/pull/940))
- negotiate protocol version in handler ([#930](https://github.com/modelcontextprotocol/rust-sdk/pull/930))

## [2.0.0](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v1.8.0...rmcp-v2.0.0) - 2026-06-27

### Added

- [**breaking**] relax tool result structuredContent type ([#919](https://github.com/modelcontextprotocol/rust-sdk/pull/919))
- deprecate roots/sampling/logging types ([#923](https://github.com/modelcontextprotocol/rust-sdk/pull/923))
- [**breaking**] align model types with MCP 2025-11-25 spec ([#927](https://github.com/modelcontextprotocol/rust-sdk/pull/927))

### Fixed

- prevent OAuth resource spoofing ([#937](https://github.com/modelcontextprotocol/rust-sdk/pull/937))
- block oauth metadata ssrf ([#935](https://github.com/modelcontextprotocol/rust-sdk/pull/935))
- prevent streamable HTTP session leak ([#934](https://github.com/modelcontextprotocol/rust-sdk/pull/934))
- fill missing fully qualified syntax in prompt_handler macros ([#866](https://github.com/modelcontextprotocol/rust-sdk/pull/866))
- *(rmcp)* add Audio variant to PromptMessageContent ([#865](https://github.com/modelcontextprotocol/rust-sdk/pull/865))

### Other

- consolidate repeated rmcp tests ([#931](https://github.com/modelcontextprotocol/rust-sdk/pull/931))
- Revert "feat!: relax tool result structuredContent type ([#919](https://github.com/modelcontextprotocol/rust-sdk/pull/919))" ([#932](https://github.com/modelcontextprotocol/rust-sdk/pull/932))
- align README examples with v2 model API ([#928](https://github.com/modelcontextprotocol/rust-sdk/pull/928))

## [1.8.0](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v1.7.0...rmcp-v1.8.0) - 2026-06-22

### Added

- standardize resource-not-found error code (SEP-2164) ([#899](https://github.com/modelcontextprotocol/rust-sdk/pull/899))
- validate OAuth authorization response issuer ([#896](https://github.com/modelcontextprotocol/rust-sdk/pull/896))
- specify OIDC application_type during dynamic client registration (SEP-837) ([#883](https://github.com/modelcontextprotocol/rust-sdk/pull/883))
- deprecate roots, sampling, and logging (SEP-2577) ([#884](https://github.com/modelcontextprotocol/rust-sdk/pull/884))

### Fixed

- *(auth)* preserve configured reqwest client ([#917](https://github.com/modelcontextprotocol/rust-sdk/pull/917))
- *(auth)* align OAuth metadata discovery ordering ([#887](https://github.com/modelcontextprotocol/rust-sdk/pull/887))
- align progress timeout token ([#909](https://github.com/modelcontextprotocol/rust-sdk/pull/909))
- *(elicitation)* preserve enumNames through ElicitationSchema serde round-trip ([#905](https://github.com/modelcontextprotocol/rust-sdk/pull/905))
- return tool errors for invalid arguments ([#894](https://github.com/modelcontextprotocol/rust-sdk/pull/894))
- *(auth)* apply offline_access to reauth paths ([#897](https://github.com/modelcontextprotocol/rust-sdk/pull/897))
- update peer info on duplicate initialize ([#862](https://github.com/modelcontextprotocol/rust-sdk/pull/862))
- strip and validate tool outputSchema and inputSchema ([#860](https://github.com/modelcontextprotocol/rust-sdk/pull/860))
- remove unnecessary fields from tools' inputSchema ([#856](https://github.com/modelcontextprotocol/rust-sdk/pull/856))
- reject init header/body version mismatch ([#853](https://github.com/modelcontextprotocol/rust-sdk/pull/853))
- align protocol version negotiation ([#855](https://github.com/modelcontextprotocol/rust-sdk/pull/855))
- accept 200 with empty body in response to notifications in addition to 202 ([#849](https://github.com/modelcontextprotocol/rust-sdk/pull/849))

### Other

- Allow custom HTTP clients for OAuth ([#908](https://github.com/modelcontextprotocol/rust-sdk/pull/908))
- Add progress-aware request timeout reset ([#858](https://github.com/modelcontextprotocol/rust-sdk/pull/858))
- *(server)* document Err vs Ok(CallToolResult::error) visibility contract on ServerHandler::call_tool ([#854](https://github.com/modelcontextprotocol/rust-sdk/pull/854))
- refine mcpmate listing copy ([#885](https://github.com/modelcontextprotocol/rust-sdk/pull/885))
- added jilebi-mcp to the list of built with rmcp ([#861](https://github.com/modelcontextprotocol/rust-sdk/pull/861))

## [1.7.0](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v1.6.0...rmcp-v1.7.0) - 2026-05-13

### Added

- add task-based stdio examples ([#839](https://github.com/modelcontextprotocol/rust-sdk/pull/839))

### Fixed

- *(rmcp)* flatten Resource variant of PromptMessageContent ([#843](https://github.com/modelcontextprotocol/rust-sdk/pull/843))
- reply -32700 on stdio parse errors instead of closing ([#833](https://github.com/modelcontextprotocol/rust-sdk/pull/833))

### Other

- *(rmcp)* remove dependency on chrono default features ([#829](https://github.com/modelcontextprotocol/rust-sdk/pull/829))
- Fix/issue 817 idle timeout log level ([#824](https://github.com/modelcontextprotocol/rust-sdk/pull/824))

## [1.6.0](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v1.5.0...rmcp-v1.6.0) - 2026-05-01

### Added

- *(http)* log Host/Origin rejections ([#826](https://github.com/modelcontextprotocol/rust-sdk/pull/826))
- *(http)* add Origin header validation ([#823](https://github.com/modelcontextprotocol/rust-sdk/pull/823))
- *(router)* support runtime disabling of tools ([#809](https://github.com/modelcontextprotocol/rust-sdk/pull/809))
- optional session store (resumabillity support) ([#775](https://github.com/modelcontextprotocol/rust-sdk/pull/775))

### Fixed

- add init_timeout for streamable-http sessions ([#811](https://github.com/modelcontextprotocol/rust-sdk/pull/811))
- *(http)* fall back to :authority for HTTP/2 ([#827](https://github.com/modelcontextprotocol/rust-sdk/pull/827))
- *(docs)* use correct Parameters<T> syntax in tool examples ([#814](https://github.com/modelcontextprotocol/rust-sdk/pull/814))

### Other

- add systemprompt-template to Built with rmcp ([#820](https://github.com/modelcontextprotocol/rust-sdk/pull/820))

## [1.5.0](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v1.4.0...rmcp-v1.5.0) - 2026-04-16

### Added

- *(transport)* add constructors for non_exhaustive error types ([#806](https://github.com/modelcontextprotocol/rust-sdk/pull/806))
- add 2025-11-25 protocol version support ([#802](https://github.com/modelcontextprotocol/rust-sdk/pull/802))

### Fixed

- treat resource metadata JSON parse failure as soft error ([#810](https://github.com/modelcontextprotocol/rust-sdk/pull/810))
- include http_request_id in request-wise priming event IDs ([#799](https://github.com/modelcontextprotocol/rust-sdk/pull/799))
- *(http)* drain SSE stream for connection reuse ([#790](https://github.com/modelcontextprotocol/rust-sdk/pull/790))

### Other

- *(deps)* update which requirement from 7 to 8 ([#807](https://github.com/modelcontextprotocol/rust-sdk/pull/807))

## [1.4.0](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v1.3.0...rmcp-v1.4.0) - 2026-04-09

### Added

- add Default and constructors to ServerSseMessage ([#794](https://github.com/modelcontextprotocol/rust-sdk/pull/794))
- add meta to elicitation results ([#792](https://github.com/modelcontextprotocol/rust-sdk/pull/792))
- *(macros)* auto-generate get_info and default router ([#785](https://github.com/modelcontextprotocol/rust-sdk/pull/785))
- *(transport)* add which_command for cross-platform executable resolution ([#774](https://github.com/modelcontextprotocol/rust-sdk/pull/774))
- *(auth)* add StoredCredentials::new() constructor ([#778](https://github.com/modelcontextprotocol/rust-sdk/pull/778))

### Fixed

- *(server)* remove initialized notification gate to support Streamable HTTP ([#788](https://github.com/modelcontextprotocol/rust-sdk/pull/788))
- default session keep_alive to 5 minutes ([#780](https://github.com/modelcontextprotocol/rust-sdk/pull/780))
- *(http)* add host check ([#764](https://github.com/modelcontextprotocol/rust-sdk/pull/764))
- exclude local feature from docs.rs build ([#782](https://github.com/modelcontextprotocol/rust-sdk/pull/782))

### Other

- update Rust toolchain to 1.92 ([#797](https://github.com/modelcontextprotocol/rust-sdk/pull/797))
- unify IntoCallToolResult Result impls ([#787](https://github.com/modelcontextprotocol/rust-sdk/pull/787))

## [1.3.0](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v1.2.0...rmcp-v1.3.0) - 2026-03-24

### Added

- *(transport)* add Unix domain socket client for streamable HTTP ([#749](https://github.com/modelcontextprotocol/rust-sdk/pull/749))
- *(auth)* implement SEP-2207 OIDC-flavored refresh token guidance ([#676](https://github.com/modelcontextprotocol/rust-sdk/pull/676))
- add configuration for transparent session re-init ([#760](https://github.com/modelcontextprotocol/rust-sdk/pull/760))
- add local feature for !Send tool handler support ([#740](https://github.com/modelcontextprotocol/rust-sdk/pull/740))

### Fixed

- prevent CallToolResult and GetTaskPayloadResult from shadowing CustomResult in untagged enums ([#771](https://github.com/modelcontextprotocol/rust-sdk/pull/771))
- drain in-flight responses on stdin EOF ([#759](https://github.com/modelcontextprotocol/rust-sdk/pull/759))
- remove default type param from StreamableHttpService ([#758](https://github.com/modelcontextprotocol/rust-sdk/pull/758))
- use cfg-gated Send+Sync supertraits to avoid semver break ([#757](https://github.com/modelcontextprotocol/rust-sdk/pull/757))
- *(rmcp)* surface JSON-RPC error bodies on HTTP 4xx responses ([#748](https://github.com/modelcontextprotocol/rust-sdk/pull/748))
- default CallToolResult content to empty vec on missing field ([#752](https://github.com/modelcontextprotocol/rust-sdk/pull/752))
- *(auth)* redact secrets in Debug output for StoredCredentials and StoredAuthorizationState ([#744](https://github.com/modelcontextprotocol/rust-sdk/pull/744))

### Other

- fix all clippy warnings across workspace ([#746](https://github.com/modelcontextprotocol/rust-sdk/pull/746))

## [1.2.0](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v1.1.1...rmcp-v1.2.0) - 2026-03-11

### Added

- add missing constructors for non-exhaustive model types ([#739](https://github.com/modelcontextprotocol/rust-sdk/pull/739))
- include granted scopes in OAuth refresh token request ([#731](https://github.com/modelcontextprotocol/rust-sdk/pull/731))

### Fixed

- handle ping requests sent before initialize handshake ([#745](https://github.com/modelcontextprotocol/rust-sdk/pull/745))
- allow deserializing notifications without params field ([#729](https://github.com/modelcontextprotocol/rust-sdk/pull/729))

### Other

- *(deps)* update jsonwebtoken requirement from 9 to 10 ([#737](https://github.com/modelcontextprotocol/rust-sdk/pull/737))

## [1.1.1](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v1.1.0...rmcp-v1.1.1) - 2026-03-09

### Fixed

- accept logging/setLevel and ping before initialized notification ([#730](https://github.com/modelcontextprotocol/rust-sdk/pull/730))

## [1.1.0](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v1.0.0...rmcp-v1.1.0) - 2026-03-04

### Added

- implement OAuth 2.0 Client Credentials flow ([#707](https://github.com/modelcontextprotocol/rust-sdk/pull/707))

### Other

- add McpMux to Built with rmcp section ([#717](https://github.com/modelcontextprotocol/rust-sdk/pull/717))

## [1.0.0](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v1.0.0-alpha...rmcp-v1.0.0) - 2026-03-03

### Fixed

- *(auth)* pass WWW-Authenticate scopes to DCR registration request ([#705](https://github.com/modelcontextprotocol/rust-sdk/pull/705))
- api ergonomics follow-up ([#720](https://github.com/modelcontextprotocol/rust-sdk/pull/720))
- *(streamable-http)* map stale session 401 to status-aware error ([#709](https://github.com/modelcontextprotocol/rust-sdk/pull/709))

## [1.0.0-alpha](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v0.17.0...rmcp-v1.0.0-alpha) - 2026-03-03

### Added

- docs update ([#718](https://github.com/modelcontextprotocol/rust-sdk/pull/718))
- *(auth)* [**breaking**] support returning extra fields from token exchange ([#700](https://github.com/modelcontextprotocol/rust-sdk/pull/700))

### Fixed

- downgrade logging of message to `TRACE` to avoid spamming logs ([#699](https://github.com/modelcontextprotocol/rust-sdk/pull/699))

### Other

- add #[non_exhaustive] and mutation methods to improve compatibility ([#715](https://github.com/modelcontextprotocol/rust-sdk/pull/715))

## [0.17.0](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v0.16.0...rmcp-v0.17.0) - 2026-02-27

### Added

- *(streamable-http)* add json_response option for stateless server mode ([#683](https://github.com/modelcontextprotocol/rust-sdk/pull/683))
- mcp sdk conformance ([#687](https://github.com/modelcontextprotocol/rust-sdk/pull/687))
- add default value support to string, number, and integer schemas ([#686](https://github.com/modelcontextprotocol/rust-sdk/pull/686))
- add trait-based tool declaration ([#677](https://github.com/modelcontextprotocol/rust-sdk/pull/677))
- send and validate MCP-Protocol-Version header ([#675](https://github.com/modelcontextprotocol/rust-sdk/pull/675))

### Fixed

- improve error logging and remove token secret from logs ([#685](https://github.com/modelcontextprotocol/rust-sdk/pull/685))
- refresh token expiry ([#680](https://github.com/modelcontextprotocol/rust-sdk/pull/680))
- gate optional dependencies behind feature flags ([#672](https://github.com/modelcontextprotocol/rust-sdk/pull/672))
- allow empty content in CallToolResult ([#681](https://github.com/modelcontextprotocol/rust-sdk/pull/681))
- *(schema)* remove AddNullable from draft2020_12 settings ([#664](https://github.com/modelcontextprotocol/rust-sdk/pull/664))

### Other

- add prose documentation for core features to meet conformance ([#702](https://github.com/modelcontextprotocol/rust-sdk/pull/702))
- Fix/sse channel replacement conflict ([#682](https://github.com/modelcontextprotocol/rust-sdk/pull/682))
- document session management for streamable HTTP transport ([#674](https://github.com/modelcontextprotocol/rust-sdk/pull/674))

## [0.16.0](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v0.15.0...rmcp-v0.16.0) - 2026-02-17

### Added

- add support for custom HTTP headers in StreamableHttpClient ([#655](https://github.com/modelcontextprotocol/rust-sdk/pull/655))
- *(auth)* add token_endpoint_auth_method to OAuthClientConfig ([#648](https://github.com/modelcontextprotocol/rust-sdk/pull/648))

### Fixed

- remove unnecessary doc-cfg ([#661](https://github.com/modelcontextprotocol/rust-sdk/pull/661))
- duplicate meta serialization ([#662](https://github.com/modelcontextprotocol/rust-sdk/pull/662))
- sort list_all() output in ToolRouter and PromptRouter for deterministic ordering ([#665](https://github.com/modelcontextprotocol/rust-sdk/pull/665))
- align task response types with MCP spec ([#658](https://github.com/modelcontextprotocol/rust-sdk/pull/658))

### Other

- upgrade reqwest to 0.13.2 ([#669](https://github.com/modelcontextprotocol/rust-sdk/pull/669))
- include LICENSE in final crate tarball ([#657](https://github.com/modelcontextprotocol/rust-sdk/pull/657))
- *(deps)* update rand requirement from 0.9 to 0.10 ([#650](https://github.com/modelcontextprotocol/rust-sdk/pull/650))
- remove unused axum dependency from server-side-http feature ([#642](https://github.com/modelcontextprotocol/rust-sdk/pull/642))
- 11-25-2025 compliant Auth ([#651](https://github.com/modelcontextprotocol/rust-sdk/pull/651))
- add rudof-mcp to MCP servers list ([#645](https://github.com/modelcontextprotocol/rust-sdk/pull/645))

## [0.15.0](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v0.14.0...rmcp-v0.15.0) - 2026-02-10

### Added

- *(elicitation)* add support URL elicitation. SEP-1036 ([#605](https://github.com/modelcontextprotocol/rust-sdk/pull/605))
- enforce SEP-1577 MUST requirements for sampling with tools ([#646](https://github.com/modelcontextprotocol/rust-sdk/pull/646))
- add native-tls as an optional TLS backend ([#631](https://github.com/modelcontextprotocol/rust-sdk/pull/631))
- *(capabilities)* add extensions field for SEP-1724 ([#643](https://github.com/modelcontextprotocol/rust-sdk/pull/643))

### Fixed

- *(tasks)* avoid dropping completed task results during collection ([#639](https://github.com/modelcontextprotocol/rust-sdk/pull/639))
- *(auth)* oauth metadata discovery ([#641](https://github.com/modelcontextprotocol/rust-sdk/pull/641))
- compilation with --no-default-features ([#593](https://github.com/modelcontextprotocol/rust-sdk/pull/593))
- *(tasks)* expose `execution.taskSupport` on tools ([#635](https://github.com/modelcontextprotocol/rust-sdk/pull/635))
- *(tasks)* correct enum variant ordering for deserialization ([#634](https://github.com/modelcontextprotocol/rust-sdk/pull/634))

### Other

- Add optional description field to Implementation struct ([#649](https://github.com/modelcontextprotocol/rust-sdk/pull/649))
- Implement SEP-1577: Sampling With Tools ([#628](https://github.com/modelcontextprotocol/rust-sdk/pull/628))

## [0.14.0](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v0.13.0...rmcp-v0.14.0) - 2026-01-23

### Fixed

- *(tasks)* #626 model task capabilities correctly ([#627](https://github.com/modelcontextprotocol/rust-sdk/pull/627))
- don't treat non-success HTTP codes as transport errors ([#618](https://github.com/modelcontextprotocol/rust-sdk/pull/618))

### Other

- show README content on docs.rs ([#583](https://github.com/modelcontextprotocol/rust-sdk/pull/583))
- added hyper-mcp to the list of built with rmcp ([#621](https://github.com/modelcontextprotocol/rust-sdk/pull/621))
- Implement SEP-1319: Decouple Request Payload from RPC Methods ([#617](https://github.com/modelcontextprotocol/rust-sdk/pull/617))

## [0.13.0](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v0.12.0...rmcp-v0.13.0) - 2026-01-15

### Added

- provide blanket implementations for ClientHandler and ServerHandler traits ([#609](https://github.com/modelcontextprotocol/rust-sdk/pull/609))
- *(service)* add close() method for graceful connection shutdown ([#588](https://github.com/modelcontextprotocol/rust-sdk/pull/588))
- *(auth)* add StateStore trait for pluggable OAuth state storage ([#614](https://github.com/modelcontextprotocol/rust-sdk/pull/614))
- *(elicitation)* implement SEP-1330 Elicitation Enum Schema Improvements ([#539](https://github.com/modelcontextprotocol/rust-sdk/pull/539))
- *(task)* add task support (SEP-1686) ([#536](https://github.com/modelcontextprotocol/rust-sdk/pull/536))

### Fixed

- use the json rpc error from the initialize response and bubble it up to the client ([#569](https://github.com/modelcontextprotocol/rust-sdk/pull/569))
- *(build)* fix build of the project when no features are selected ([#606](https://github.com/modelcontextprotocol/rust-sdk/pull/606))
- use Semaphore instead of Notify in OneshotTransport to prevent race condition ([#611](https://github.com/modelcontextprotocol/rust-sdk/pull/611))
- add OpenID Connect discovery support per spec-2025-11-25 4.3 ([#598](https://github.com/modelcontextprotocol/rust-sdk/pull/598))
- only try to refresh access tokens if we have a refresh token or an expiry time ([#594](https://github.com/modelcontextprotocol/rust-sdk/pull/594))
- *(docs)* add spreadsheet-mcp to Built with rmcp ([#582](https://github.com/modelcontextprotocol/rust-sdk/pull/582))

### Other

- *(elicitation)* improve enum schema builder, small changes of elicitation builder ([#608](https://github.com/modelcontextprotocol/rust-sdk/pull/608))
- add pre-commit hook for conventional commit verification ([#619](https://github.com/modelcontextprotocol/rust-sdk/pull/619))
- clean up optional dependencies ([#546](https://github.com/modelcontextprotocol/rust-sdk/pull/546))
- re-export ServerSseMessage from session module ([#612](https://github.com/modelcontextprotocol/rust-sdk/pull/612))
- Implement SEP-1699: Support SSE Polling via Server-Side Disconnect ([#604](https://github.com/modelcontextprotocol/rust-sdk/pull/604))
- update README external links ([#603](https://github.com/modelcontextprotocol/rust-sdk/pull/603))
- clarity and formatting ([#602](https://github.com/modelcontextprotocol/rust-sdk/pull/602))
- Add optional icons field to RawResourceTemplate ([#589](https://github.com/modelcontextprotocol/rust-sdk/pull/589))

## [0.12.0](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v0.11.0...rmcp-v0.12.0) - 2025-12-18

### Added

- add support for custom requests ([#590](https://github.com/modelcontextprotocol/rust-sdk/pull/590))
- add support for custom server notifications ([#580](https://github.com/modelcontextprotocol/rust-sdk/pull/580))

### Fixed

- update process-wrap to v9.0 ([#586](https://github.com/modelcontextprotocol/rust-sdk/pull/586))
- *(oauth)* rfc8414 should judement the response_types ([#485](https://github.com/modelcontextprotocol/rust-sdk/pull/485))

### Other

- Add SEP-991 (CIMD) support for URL-based client IDs ([#570](https://github.com/modelcontextprotocol/rust-sdk/pull/570))
- merge cached_schema_for_type into schema_for_type ([#581](https://github.com/modelcontextprotocol/rust-sdk/pull/581))
- Add NexusCore MCP to project list ([#573](https://github.com/modelcontextprotocol/rust-sdk/pull/573))

## [0.11.0](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v0.10.0...rmcp-v0.11.0) - 2025-12-08

### Added

- *(meta)* add _meta field to prompts, resources and paginated result ([#558](https://github.com/modelcontextprotocol/rust-sdk/pull/558))
- [**breaking**] remove SSE transport support ([#562](https://github.com/modelcontextprotocol/rust-sdk/pull/562))

### Fixed

- *(streamable-http)* gracefully shutdown while client connected ([#494](https://github.com/modelcontextprotocol/rust-sdk/pull/494))

### Other

- Implements outputSchema validation ([#566](https://github.com/modelcontextprotocol/rust-sdk/pull/566))
- add video-transcriber-mcp-rs to projects built with rmcp ([#565](https://github.com/modelcontextprotocol/rust-sdk/pull/565))

## [0.10.0](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v0.9.1...rmcp-v0.10.0) - 2025-12-01

### Added

- add support for custom client notifications ([#556](https://github.com/modelcontextprotocol/rust-sdk/pull/556))

### Other

- replace paste with pastey for macros feature ([#564](https://github.com/modelcontextprotocol/rust-sdk/pull/564))

## [0.9.1](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v0.9.0...rmcp-v0.9.1) - 2025-11-24

### Added

- *(streamable-http)* support both SSE and JSON response formats ([#540](https://github.com/modelcontextprotocol/rust-sdk/pull/540))

### Fixed

- don't block on creating the SSE stream ([#553](https://github.com/modelcontextprotocol/rust-sdk/pull/553))
- *(shemars)* use JSON Schema 2020-12 as Default Dialect ([#549](https://github.com/modelcontextprotocol/rust-sdk/pull/549))
- *(oauth)* let OAuth discovery skip to next well-known URL candidate on JSON parse error. ([#545](https://github.com/modelcontextprotocol/rust-sdk/pull/545))

### Other

- Implementation of SEP-986: Specify Format for Tool Names ([#551](https://github.com/modelcontextprotocol/rust-sdk/pull/551))

## [0.9.0](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v0.8.5...rmcp-v0.9.0) - 2025-11-17

### Added

- *(auth)* implement CredentialStore trait ([#542](https://github.com/modelcontextprotocol/rust-sdk/pull/542))
- *(tool)* add _meta to tool definitions ([#534](https://github.com/modelcontextprotocol/rust-sdk/pull/534))

## [0.8.5](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v0.8.4...rmcp-v0.8.5) - 2025-11-05

### Fixed

- *(oauth)* respect oauth-protected-resource discovery ([#511](https://github.com/modelcontextprotocol/rust-sdk/pull/511))

## [0.8.4](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v0.8.3...rmcp-v0.8.4) - 2025-11-04

### Fixed

- *(oauth)* fix oauth credential refresh ([#509](https://github.com/modelcontextprotocol/rust-sdk/pull/509))
- do not manually construct fallback authorization metadata ([#507](https://github.com/modelcontextprotocol/rust-sdk/pull/507))
- *(doc)* add stakpak-agent to Built with rmcp section ([#500](https://github.com/modelcontextprotocol/rust-sdk/pull/500))

## [0.8.3](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v0.8.2...rmcp-v0.8.3) - 2025-10-22

### Fixed

- accept 204 in addition to 202 on initialize ([#497](https://github.com/modelcontextprotocol/rust-sdk/pull/497))

## [0.8.2](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v0.8.1...rmcp-v0.8.2) - 2025-10-21

### Added

- add type-safe elicitation schema support ([#465](https://github.com/modelcontextprotocol/rust-sdk/pull/465)) ([#466](https://github.com/modelcontextprotocol/rust-sdk/pull/466))
- *(SEP-973)* following change Icon.sizes from string to string array ([#479](https://github.com/modelcontextprotocol/rust-sdk/pull/479))

### Fixed

- *(oauth)* three oauth discovery and registration issues ([#489](https://github.com/modelcontextprotocol/rust-sdk/pull/489))
- *(oauth)* dynamic client registration should be optional ([#463](https://github.com/modelcontextprotocol/rust-sdk/pull/463))
- *(sse-client)* consume control frames; refresh message endpoint ([#448](https://github.com/modelcontextprotocol/rust-sdk/pull/448))

### Other

- Streamable HTTP: drain SSE frames until the initialize response, ignoring early notifications to prevent handshake timeouts ([#467](https://github.com/modelcontextprotocol/rust-sdk/pull/467))
- bump crate version in README.md ([#471](https://github.com/modelcontextprotocol/rust-sdk/pull/471))

## [0.8.1](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v0.8.0...rmcp-v0.8.1) - 2025-10-07

### Fixed

- *(oauth)* pass bearer token to all streamable http requests ([#476](https://github.com/modelcontextprotocol/rust-sdk/pull/476))
- fix spellcheck on intentional typo in CHANGELOG ([#470](https://github.com/modelcontextprotocol/rust-sdk/pull/470))

## [0.8.0](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v0.7.0...rmcp-v0.8.0) - 2025-10-04

### Added

- allow clients to override client_name ([#469](https://github.com/modelcontextprotocol/rust-sdk/pull/469))

### Fixed

- *(oauth)* support suffixed and prefixed well-known paths ([#459](https://github.com/modelcontextprotocol/rust-sdk/pull/459))
- generate default schema for tools with no params ([#446](https://github.com/modelcontextprotocol/rust-sdk/pull/446))

### Other

- bump to rust 1.90.0 ([#453](https://github.com/modelcontextprotocol/rust-sdk/pull/453))

## [0.7.0](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v0.6.4...rmcp-v0.7.0) - 2025-09-24

### Fixed

- return auth errors ([#451](https://github.com/modelcontextprotocol/rust-sdk/pull/451))
- *(oauth)* do not treat empty secret as valid for public clients ([#443](https://github.com/modelcontextprotocol/rust-sdk/pull/443))
- *(clippy)* add doc comment for generated tool attr fn ([#439](https://github.com/modelcontextprotocol/rust-sdk/pull/439))
- *(oauth)* require CSRF token as part of the OAuth authorization flow. ([#435](https://github.com/modelcontextprotocol/rust-sdk/pull/435))

### Other

- *(root)* Add Terminator to Built with rmcp section ([#437](https://github.com/modelcontextprotocol/rust-sdk/pull/437))
- Non-empty paths in OAuth2 Authorization Server Metadata URLs ([#441](https://github.com/modelcontextprotocol/rust-sdk/pull/441))

## [0.6.4](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v0.6.3...rmcp-v0.6.4) - 2025-09-11

### Added

- *(SEP-973)* add support for icons and websiteUrl across relevant types ([#432](https://github.com/modelcontextprotocol/rust-sdk/pull/432))
- implement context-aware completion (MCP 2025-06-18) ([#396](https://github.com/modelcontextprotocol/rust-sdk/pull/396))
- add `title` field for data types ([#410](https://github.com/modelcontextprotocol/rust-sdk/pull/410))

### Fixed

- crates/rmcp/src/handler/client/progress.rs XXXXXX -> dispatcher ([#429](https://github.com/modelcontextprotocol/rust-sdk/pull/429))
- build issue due to missing struct field ([#427](https://github.com/modelcontextprotocol/rust-sdk/pull/427))
- generate simple {} schema for tools with no parameters ([#425](https://github.com/modelcontextprotocol/rust-sdk/pull/425))

### Other

- Skip notification in initialization handshake ([#421](https://github.com/modelcontextprotocol/rust-sdk/pull/421))
- add nvim-mcp project built by rmcp ([#422](https://github.com/modelcontextprotocol/rust-sdk/pull/422))

## [0.6.3](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v0.6.2...rmcp-v0.6.3) - 2025-09-04

### Fixed

- change JSON-RPC request ID type from u32 to i64 ([#416](https://github.com/modelcontextprotocol/rust-sdk/pull/416))

## [0.6.2](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v0.6.1...rmcp-v0.6.2) - 2025-09-04

### Added

- *(rmcp)* add optional _meta to CallToolResult, EmbeddedResource, and ResourceContents ([#386](https://github.com/modelcontextprotocol/rust-sdk/pull/386))

### Fixed

- resolve compatibility issues with servers sending LSP notifications ([#413](https://github.com/modelcontextprotocol/rust-sdk/pull/413))
- remove batched json rpc  support ([#408](https://github.com/modelcontextprotocol/rust-sdk/pull/408))
- transport-streamable-http-server depends on transport-worker ([#405](https://github.com/modelcontextprotocol/rust-sdk/pull/405))
- *(typo)* correct typo in error message for transport cancellation and field. ([#404](https://github.com/modelcontextprotocol/rust-sdk/pull/404))

### Other

- Spec conformance: meta support and spec updates ([#415](https://github.com/modelcontextprotocol/rust-sdk/pull/415))
- add the rmcp-openapi and rmcp-actix-web related projects ([#406](https://github.com/modelcontextprotocol/rust-sdk/pull/406))

## [0.6.1](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v0.6.0...rmcp-v0.6.1) - 2025-08-29

### Added

- *(rmcp)* add authorization header support for the streamable http client ([#390](https://github.com/modelcontextprotocol/rust-sdk/pull/390))
- *(model)* add helpers to build enum from concrete values ([#393](https://github.com/modelcontextprotocol/rust-sdk/pull/393))
- *(model)* expose client method name ([#391](https://github.com/modelcontextprotocol/rust-sdk/pull/391))
- add resource_link support to tools and prompts ([#381](https://github.com/modelcontextprotocol/rust-sdk/pull/381))
- Add prompt support ([#351](https://github.com/modelcontextprotocol/rust-sdk/pull/351))
- include reqwest in transport-streamble-http-client feature ([#376](https://github.com/modelcontextprotocol/rust-sdk/pull/376))

### Fixed

- *(auth)* url parse is not correct ([#402](https://github.com/modelcontextprotocol/rust-sdk/pull/402))
- *(readme)* missing use declarations, more accurate server instructions ([#399](https://github.com/modelcontextprotocol/rust-sdk/pull/399))
- enhance transport graceful shutdown with proper writer closure ([#392](https://github.com/modelcontextprotocol/rust-sdk/pull/392))

### Other

- simplify remove_route method signature ([#401](https://github.com/modelcontextprotocol/rust-sdk/pull/401))

## [0.6.0](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v0.5.0...rmcp-v0.6.0) - 2025-08-19

### Added

- Add MCP Elicitation support ([#332](https://github.com/modelcontextprotocol/rust-sdk/pull/332))
- keep internal error in worker's quit reason ([#372](https://github.com/modelcontextprotocol/rust-sdk/pull/372))

### Fixed

- match shape of the calltoolresult schema ([#377](https://github.com/modelcontextprotocol/rust-sdk/pull/377))
- make stdio shutdown more graceful ([#364](https://github.com/modelcontextprotocol/rust-sdk/pull/364))
- *(tool)* remove unnecessary schema validation ([#375](https://github.com/modelcontextprotocol/rust-sdk/pull/375))
- *(rmcp)* return serialized json with structured content ([#368](https://github.com/modelcontextprotocol/rust-sdk/pull/368))

### Other

- add related project rustfs-mcp ([#378](https://github.com/modelcontextprotocol/rust-sdk/pull/378))
- *(streamable)* add document for extracting http info ([#373](https://github.com/modelcontextprotocol/rust-sdk/pull/373))

## [0.5.0](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v0.4.1...rmcp-v0.5.0) - 2025-08-07

### Fixed

- correct numeric types in progress notifications ([#361](https://github.com/modelcontextprotocol/rust-sdk/pull/361))

## [0.4.1](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v0.4.0...rmcp-v0.4.1) - 2025-08-07

### Fixed

- *(rmcp)* allow both content and structured content ([#359](https://github.com/modelcontextprotocol/rust-sdk/pull/359))

## [0.4.0](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v0.3.2...rmcp-v0.4.0) - 2025-08-05

### Added

- [**breaking**] Add support for `Tool.outputSchema` and `CallToolResult.structuredContent` ([#316](https://github.com/modelcontextprotocol/rust-sdk/pull/316))

### Fixed

- don't wrap errors in streamable http auth client ([#353](https://github.com/modelcontextprotocol/rust-sdk/pull/353))
- *(prompt)* remove unused code ([#343](https://github.com/modelcontextprotocol/rust-sdk/pull/343))

## [0.3.2](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v0.3.1...rmcp-v0.3.2) - 2025-07-30

### Fixed

- *(capabilities)* do not serialize None as null for `list_changed` ([#341](https://github.com/modelcontextprotocol/rust-sdk/pull/341))
- *(Transport)* close oneshot transport on error ([#340](https://github.com/modelcontextprotocol/rust-sdk/pull/340))
- *(oauth)* expose OAuthTokenResponse publicly ([#335](https://github.com/modelcontextprotocol/rust-sdk/pull/335))

## [0.3.1](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v0.3.0...rmcp-v0.3.1) - 2025-07-29

### Fixed

- use mimeType instead of mime_type for MCP specification compliance ([#339](https://github.com/modelcontextprotocol/rust-sdk/pull/339))
- return a 405 for GET and DELETE if stateful_mode=false ([#331](https://github.com/modelcontextprotocol/rust-sdk/pull/331))
- propagate tracing spans when spawning new tokio tasks ([#334](https://github.com/modelcontextprotocol/rust-sdk/pull/334))
- Explicitly added client_id as an extra parameter causes bad token requests ([#322](https://github.com/modelcontextprotocol/rust-sdk/pull/322))

### Other

- Fix formatting in crate descriptions in README.md ([#333](https://github.com/modelcontextprotocol/rust-sdk/pull/333))

## [0.3.0](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v0.2.1...rmcp-v0.3.0) - 2025-07-15

### Added

- unified error type ([#308](https://github.com/modelcontextprotocol/rust-sdk/pull/308))
- *(transport)* add builder & expose child stderr ([#305](https://github.com/modelcontextprotocol/rust-sdk/pull/305))

### Other

- *(deps)* update schemars requirement from 0.8 to 1.0 ([#258](https://github.com/modelcontextprotocol/rust-sdk/pull/258))
- *(rmcp)* bump rmcp-macros version to match ([#311](https://github.com/modelcontextprotocol/rust-sdk/pull/311))
- fix packages used for server example ([#309](https://github.com/modelcontextprotocol/rust-sdk/pull/309))

## [0.2.1](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v0.2.0...rmcp-v0.2.1) - 2025-07-03

### Other

- *(docs)* Minor README updates ([#301](https://github.com/modelcontextprotocol/rust-sdk/pull/301))

## [0.2.0](https://github.com/modelcontextprotocol/rust-sdk/compare/rmcp-v0.1.5...rmcp-v0.2.0) - 2025-07-02

### Added

- mark boxed http body as sync ([#291](https://github.com/modelcontextprotocol/rust-sdk/pull/291))
- add progress notification handling and related structures ([#282](https://github.com/modelcontextprotocol/rust-sdk/pull/282))
- allow failable service creation in streamable HTTP tower service ([#244](https://github.com/modelcontextprotocol/rust-sdk/pull/244))
- provide more context information ([#236](https://github.com/modelcontextprotocol/rust-sdk/pull/236))
- stateless mode of streamable http client ([#233](https://github.com/modelcontextprotocol/rust-sdk/pull/233))
- add cancellation_token method to `RunningService` ([#218](https://github.com/modelcontextprotocol/rust-sdk/pull/218))
- better http server support ([#199](https://github.com/modelcontextprotocol/rust-sdk/pull/199))
- throw initialize error detail ([#192](https://github.com/modelcontextprotocol/rust-sdk/pull/192))
- sse client optionally skip the endpoint event ([#187](https://github.com/modelcontextprotocol/rust-sdk/pull/187))
- *(server)* add annotation to tool macro ([#184](https://github.com/modelcontextprotocol/rust-sdk/pull/184))
- *(model)* add json schema generation support for all model types ([#176](https://github.com/modelcontextprotocol/rust-sdk/pull/176))
- *(openapi)* add OpenAPI v3 compatibility and test for nullable field schema workaround ([#135](https://github.com/modelcontextprotocol/rust-sdk/pull/135)) ([#137](https://github.com/modelcontextprotocol/rust-sdk/pull/137))
- *(extension)* extract http request part into rmcp extension ([#163](https://github.com/modelcontextprotocol/rust-sdk/pull/163))
- *(transport)* support streamable http server ([#152](https://github.com/modelcontextprotocol/rust-sdk/pull/152))
- *(oauth)* fixes + cache client credentials ([#157](https://github.com/modelcontextprotocol/rust-sdk/pull/157))
- allow use of reqwest without ring provider ([#155](https://github.com/modelcontextprotocol/rust-sdk/pull/155))
- extensions to context ([#102](https://github.com/modelcontextprotocol/rust-sdk/pull/102))
- revision-2025-03-26 without streamable http ([#84](https://github.com/modelcontextprotocol/rust-sdk/pull/84))
- *(tool)* allow tool call return a serializable value in json format ([#75](https://github.com/modelcontextprotocol/rust-sdk/pull/75)) ([#78](https://github.com/modelcontextprotocol/rust-sdk/pull/78))
- Sse server auto ping ([#74](https://github.com/modelcontextprotocol/rust-sdk/pull/74))
- *(transport)* Sse client transport trait ([#67](https://github.com/modelcontextprotocol/rust-sdk/pull/67))

### Fixed

- let users decide what to wrap in child process command ([#279](https://github.com/modelcontextprotocol/rust-sdk/pull/279))
- cancellable initialization process ([#280](https://github.com/modelcontextprotocol/rust-sdk/pull/280))
- inject part into extension when handing init req ([#275](https://github.com/modelcontextprotocol/rust-sdk/pull/275))
- streamable http server close request channel on response([#266](https://github.com/modelcontextprotocol/rust-sdk/pull/266)) ([#270](https://github.com/modelcontextprotocol/rust-sdk/pull/270))
- streamable http client close on response ([#268](https://github.com/modelcontextprotocol/rust-sdk/pull/268))
- expose TokioChildWrapper::id() in TokioChildProcess and TokioChildProcessOut ([#254](https://github.com/modelcontextprotocol/rust-sdk/pull/254))
- add compatibility handling for non-standard notifications in async_rw ([#247](https://github.com/modelcontextprotocol/rust-sdk/pull/247))
- allow SSE server router to be nested ([#240](https://github.com/modelcontextprotocol/rust-sdk/pull/240))
- error for status in post method of streamable http client ([#238](https://github.com/modelcontextprotocol/rust-sdk/pull/238))
- disable wasmbind in chrono for wasm32-unknown-unknown ([#234](https://github.com/modelcontextprotocol/rust-sdk/pull/234))
- *(examples)* add clients in examples's readme ([#225](https://github.com/modelcontextprotocol/rust-sdk/pull/225))
- generic ServerHandler ([#223](https://github.com/modelcontextprotocol/rust-sdk/pull/223))
- comment error ([#215](https://github.com/modelcontextprotocol/rust-sdk/pull/215))
- resolve the server 406 error in API calls ([#203](https://github.com/modelcontextprotocol/rust-sdk/pull/203))
- sse endpoint build follow js's `new URL(url, base)` ([#197](https://github.com/modelcontextprotocol/rust-sdk/pull/197))
- more friendly interface to get service error ([#190](https://github.com/modelcontextprotocol/rust-sdk/pull/190))
- cleanup zombie processes for child process client ([#156](https://github.com/modelcontextprotocol/rust-sdk/pull/156))
- *(schemar)* use self-defined settings ([#180](https://github.com/modelcontextprotocol/rust-sdk/pull/180))
- *(transport-sse-server)* cleanup on connection drop ([#165](https://github.com/modelcontextprotocol/rust-sdk/pull/165))
- *(test)* skip serialize tool's annotation if empty ([#160](https://github.com/modelcontextprotocol/rust-sdk/pull/160))
- fix resource leak ([#136](https://github.com/modelcontextprotocol/rust-sdk/pull/136))
- *(handler)* do call handler methods when initialize server ([#118](https://github.com/modelcontextprotocol/rust-sdk/pull/118))
- *(server)* schemars compilation errors ([#104](https://github.com/modelcontextprotocol/rust-sdk/pull/104))
- *(test)* fix test introduced by #97 ([#101](https://github.com/modelcontextprotocol/rust-sdk/pull/101))
- *(macro)* add generics marco types support ([#98](https://github.com/modelcontextprotocol/rust-sdk/pull/98))
- *(typo)* nit language corrections ([#90](https://github.com/modelcontextprotocol/rust-sdk/pull/90))
- *(typo)* s/marcos/macros/ ([#85](https://github.com/modelcontextprotocol/rust-sdk/pull/85))
- *(client)* add error enum while deal client info ([#76](https://github.com/modelcontextprotocol/rust-sdk/pull/76))
- *(notification)* fix wrongly error report in notification ([#70](https://github.com/modelcontextprotocol/rust-sdk/pull/70))
- *(test)* fix tool deserialization error ([#68](https://github.com/modelcontextprotocol/rust-sdk/pull/68))
- *(server)* add error enum while deal server info ([#51](https://github.com/modelcontextprotocol/rust-sdk/pull/51))

### Other

- add simpling example and test ([#289](https://github.com/modelcontextprotocol/rust-sdk/pull/289))
- add update for test_message_schema ([#286](https://github.com/modelcontextprotocol/rust-sdk/pull/286))
- add notion clear in model.rs ([#284](https://github.com/modelcontextprotocol/rust-sdk/pull/284))
- cov settings, and fix several building warnings ([#281](https://github.com/modelcontextprotocol/rust-sdk/pull/281))
- refactor tool macros and router implementation ([#261](https://github.com/modelcontextprotocol/rust-sdk/pull/261))
- fix regression in URL joining ([#265](https://github.com/modelcontextprotocol/rust-sdk/pull/265))
- remove erroneous definitions_path  ([#264](https://github.com/modelcontextprotocol/rust-sdk/pull/264))
- allow using a TokioCommandWrap for TokioChildProcess::new closes #243 ([#245](https://github.com/modelcontextprotocol/rust-sdk/pull/245))
- Fix typo ([#249](https://github.com/modelcontextprotocol/rust-sdk/pull/249))
- provide http server as tower service ([#228](https://github.com/modelcontextprotocol/rust-sdk/pull/228))
- *(deps)* update sse-stream requirement from 0.1.4 to 0.2.0 ([#230](https://github.com/modelcontextprotocol/rust-sdk/pull/230))
- Server info is only retrieved once during initialization ([#214](https://github.com/modelcontextprotocol/rust-sdk/pull/214))
- *(deps)* update base64 requirement from 0.21 to 0.22 ([#209](https://github.com/modelcontextprotocol/rust-sdk/pull/209))
- revert badge ([#202](https://github.com/modelcontextprotocol/rust-sdk/pull/202))
- use hierarchical readme for publishing ([#198](https://github.com/modelcontextprotocol/rust-sdk/pull/198))
- Ci/coverage badge ([#191](https://github.com/modelcontextprotocol/rust-sdk/pull/191))
- fix error introduced by merge, and reorganize feature ([#185](https://github.com/modelcontextprotocol/rust-sdk/pull/185))
- Transport trait and worker transport, and streamable http client with those new features. ([#167](https://github.com/modelcontextprotocol/rust-sdk/pull/167))
- add oauth2 support ([#130](https://github.com/modelcontextprotocol/rust-sdk/pull/130))
- remove un-used tower.rs ([#125](https://github.com/modelcontextprotocol/rust-sdk/pull/125))
- update calculator example description ([#115](https://github.com/modelcontextprotocol/rust-sdk/pull/115))
- fix the url ([#120](https://github.com/modelcontextprotocol/rust-sdk/pull/120))
- add a simple chat client for example ([#119](https://github.com/modelcontextprotocol/rust-sdk/pull/119))
- add an overview to `rmcp/src/lib.rs` ([#116](https://github.com/modelcontextprotocol/rust-sdk/pull/116))
- *(context)* test context request handling and refactor for reusable client-server tests ([#97](https://github.com/modelcontextprotocol/rust-sdk/pull/97))
- *(logging)* Add tests for logging  ([#96](https://github.com/modelcontextprotocol/rust-sdk/pull/96))
- Adopt Devcontainer for Development Environment ([#81](https://github.com/modelcontextprotocol/rust-sdk/pull/81))
- fix typos ([#79](https://github.com/modelcontextprotocol/rust-sdk/pull/79))
- format and fix typo ([#72](https://github.com/modelcontextprotocol/rust-sdk/pull/72))
- add documentation generation job ([#59](https://github.com/modelcontextprotocol/rust-sdk/pull/59))
- add test with js server ([#65](https://github.com/modelcontextprotocol/rust-sdk/pull/65))
- fmt the project ([#54](https://github.com/modelcontextprotocol/rust-sdk/pull/54))
- *(sse_server)* separate router and server startup ([#52](https://github.com/modelcontextprotocol/rust-sdk/pull/52))
- fix broken link ([#53](https://github.com/modelcontextprotocol/rust-sdk/pull/53))
- fix the branch name for git dependency ([#46](https://github.com/modelcontextprotocol/rust-sdk/pull/46))
- Move whole rmcp crate to official rust sdk ([#44](https://github.com/modelcontextprotocol/rust-sdk/pull/44))
- Initial commit