Changelog

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)
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)

1.7.0 - 2026-05-13

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)

1.6.0 - 2026-05-01

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)

1.5.0 - 2026-04-16

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)

1.4.0 - 2026-04-09

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)

1.3.0 - 2026-03-24

Added

(transport) add Unix domain socket client for streamable HTTP (#749)
(auth) implement SEP-2207 OIDC-flavored refresh token guidance (#676)
add configuration for transparent session re-init (#760)
add local feature for !Send tool handler support (#740)

Fixed

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

Other

fix all clippy warnings across workspace (#746)

1.2.0 - 2026-03-11

Added

add missing constructors for non-exhaustive model types (#739)
include granted scopes in OAuth refresh token request (#731)

Fixed

handle ping requests sent before initialize handshake (#745)
allow deserializing notifications without params field (#729)

Other

(deps) update jsonwebtoken requirement from 9 to 10 (#737)

1.1.1 - 2026-03-09

Fixed

accept logging/setLevel and ping before initialized notification (#730)

1.1.0 - 2026-03-04

Added

implement OAuth 2.0 Client Credentials flow (#707)

Other

add McpMux to Built with rmcp section (#717)

1.0.0 - 2026-03-03

Fixed

(auth) pass WWW-Authenticate scopes to DCR registration request (#705)
api ergonomics follow-up (#720)
(streamable-http) map stale session 401 to status-aware error (#709)

1.0.0-alpha - 2026-03-03

Added

docs update (#718)
(auth) [breaking] support returning extra fields from token exchange (#700)

Fixed

downgrade logging of message to TRACE to avoid spamming logs (#699)

Other

add #[non_exhaustive] and mutation methods to improve compatibility (#715)

0.17.0 - 2026-02-27

Added

(streamable-http) add json_response option for stateless server mode (#683)
mcp sdk conformance (#687)
add default value support to string, number, and integer schemas (#686)
add trait-based tool declaration (#677)
send and validate MCP-Protocol-Version header (#675)

Fixed

improve error logging and remove token secret from logs (#685)
refresh token expiry (#680)
gate optional dependencies behind feature flags (#672)
allow empty content in CallToolResult (#681)
(schema) remove AddNullable from draft2020_12 settings (#664)

Other

add prose documentation for core features to meet conformance (#702)
Fix/sse channel replacement conflict (#682)
document session management for streamable HTTP transport (#674)

0.16.0 - 2026-02-17

Added

add support for custom HTTP headers in StreamableHttpClient (#655)
(auth) add token_endpoint_auth_method to OAuthClientConfig (#648)

Fixed

remove unnecessary doc-cfg (#661)
duplicate meta serialization (#662)
sort list_all() output in ToolRouter and PromptRouter for deterministic ordering (#665)
align task response types with MCP spec (#658)

Other

upgrade reqwest to 0.13.2 (#669)
include LICENSE in final crate tarball (#657)
(deps) update rand requirement from 0.9 to 0.10 (#650)
remove unused axum dependency from server-side-http feature (#642)
11-25-2025 compliant Auth (#651)
add rudof-mcp to MCP servers list (#645)

0.15.0 - 2026-02-10

Added

(elicitation) add support URL elicitation. SEP-1036 (#605)
enforce SEP-1577 MUST requirements for sampling with tools (#646)
add native-tls as an optional TLS backend (#631)
(capabilities) add extensions field for SEP-1724 (#643)

Fixed

(tasks) avoid dropping completed task results during collection (#639)
(auth) oauth metadata discovery (#641)
compilation with --no-default-features (#593)
(tasks) expose execution.taskSupport on tools (#635)
(tasks) correct enum variant ordering for deserialization (#634)

Other

Add optional description field to Implementation struct (#649)
Implement SEP-1577: Sampling With Tools (#628)

0.14.0 - 2026-01-23

Fixed

(tasks) #626 model task capabilities correctly (#627)
don't treat non-success HTTP codes as transport errors (#618)

Other

show README content on docs.rs (#583)
added hyper-mcp to the list of built with rmcp (#621)
Implement SEP-1319: Decouple Request Payload from RPC Methods (#617)

0.13.0 - 2026-01-15

Added

provide blanket implementations for ClientHandler and ServerHandler traits (#609)
(service) add close() method for graceful connection shutdown (#588)
(auth) add StateStore trait for pluggable OAuth state storage (#614)
(elicitation) implement SEP-1330 Elicitation Enum Schema Improvements (#539)
(task) add task support (SEP-1686) (#536)

Fixed

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

Other

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

0.12.0 - 2025-12-18

Added

add support for custom requests (#590)
add support for custom server notifications (#580)

Fixed

update process-wrap to v9.0 (#586)
(oauth) rfc8414 should judement the response_types (#485)

Other

Add SEP-991 (CIMD) support for URL-based client IDs (#570)
merge cached_schema_for_type into schema_for_type (#581)
Add NexusCore MCP to project list (#573)

0.11.0 - 2025-12-08

Added

(meta) add _meta field to prompts, resources and paginated result (#558)
[breaking] remove SSE transport support (#562)

Fixed

(streamable-http) gracefully shutdown while client connected (#494)

Other

Implements outputSchema validation (#566)
add video-transcriber-mcp-rs to projects built with rmcp (#565)

0.10.0 - 2025-12-01

Added

add support for custom client notifications (#556)

Other

replace paste with pastey for macros feature (#564)

0.9.1 - 2025-11-24

Added

(streamable-http) support both SSE and JSON response formats (#540)

Fixed

don't block on creating the SSE stream (#553)
(shemars) use JSON Schema 2020-12 as Default Dialect (#549)
(oauth) let OAuth discovery skip to next well-known URL candidate on JSON parse error. (#545)

Other

Implementation of SEP-986: Specify Format for Tool Names (#551)

0.9.0 - 2025-11-17

Added

(auth) implement CredentialStore trait (#542)
(tool) add _meta to tool definitions (#534)

0.8.5 - 2025-11-05

Fixed

(oauth) respect oauth-protected-resource discovery (#511)

0.8.4 - 2025-11-04

Fixed

(oauth) fix oauth credential refresh (#509)
do not manually construct fallback authorization metadata (#507)
(doc) add stakpak-agent to Built with rmcp section (#500)

0.8.3 - 2025-10-22

Fixed

accept 204 in addition to 202 on initialize (#497)

0.8.2 - 2025-10-21

Added

add type-safe elicitation schema support (#465) (#466)
(SEP-973) following change Icon.sizes from string to string array (#479)

Fixed

(oauth) three oauth discovery and registration issues (#489)
(oauth) dynamic client registration should be optional (#463)
(sse-client) consume control frames; refresh message endpoint (#448)

Other

Streamable HTTP: drain SSE frames until the initialize response, ignoring early notifications to prevent handshake timeouts (#467)
bump crate version in README.md (#471)

0.8.1 - 2025-10-07

Fixed

(oauth) pass bearer token to all streamable http requests (#476)
fix spellcheck on intentional typo in CHANGELOG (#470)

0.8.0 - 2025-10-04

Added

allow clients to override client_name (#469)

Fixed

(oauth) support suffixed and prefixed well-known paths (#459)
generate default schema for tools with no params (#446)

Other

bump to rust 1.90.0 (#453)

0.7.0 - 2025-09-24

Fixed

return auth errors (#451)
(oauth) do not treat empty secret as valid for public clients (#443)
(clippy) add doc comment for generated tool attr fn (#439)
(oauth) require CSRF token as part of the OAuth authorization flow. (#435)

Other

(root) Add Terminator to Built with rmcp section (#437)
Non-empty paths in OAuth2 Authorization Server Metadata URLs (#441)

0.6.4 - 2025-09-11

Added

(SEP-973) add support for icons and websiteUrl across relevant types (#432)
implement context-aware completion (MCP 2025-06-18) (#396)
add title field for data types (#410)

Fixed

crates/rmcp/src/handler/client/progress.rs XXXXXX -> dispatcher (#429)
build issue due to missing struct field (#427)
generate simple {} schema for tools with no parameters (#425)

Other

Skip notification in initialization handshake (#421)
add nvim-mcp project built by rmcp (#422)

0.6.3 - 2025-09-04

Fixed

change JSON-RPC request ID type from u32 to i64 (#416)

0.6.2 - 2025-09-04

Added

(rmcp) add optional _meta to CallToolResult, EmbeddedResource, and ResourceContents (#386)

Fixed

resolve compatibility issues with servers sending LSP notifications (#413)
remove batched json rpc support (#408)
transport-streamable-http-server depends on transport-worker (#405)
(typo) correct typo in error message for transport cancellation and field. (#404)

Other

Spec conformance: meta support and spec updates (#415)
add the rmcp-openapi and rmcp-actix-web related projects (#406)

0.6.1 - 2025-08-29

Added

(rmcp) add authorization header support for the streamable http client (#390)
(model) add helpers to build enum from concrete values (#393)
(model) expose client method name (#391)
add resource_link support to tools and prompts (#381)
Add prompt support (#351)
include reqwest in transport-streamble-http-client feature (#376)

Fixed

(auth) url parse is not correct (#402)
(readme) missing use declarations, more accurate server instructions (#399)
enhance transport graceful shutdown with proper writer closure (#392)

Other

simplify remove_route method signature (#401)

0.6.0 - 2025-08-19

Added

Add MCP Elicitation support (#332)
keep internal error in worker's quit reason (#372)

Fixed

match shape of the calltoolresult schema (#377)
make stdio shutdown more graceful (#364)
(tool) remove unnecessary schema validation (#375)
(rmcp) return serialized json with structured content (#368)

Other

add related project rustfs-mcp (#378)
(streamable) add document for extracting http info (#373)

0.5.0 - 2025-08-07

Fixed

correct numeric types in progress notifications (#361)

0.4.1 - 2025-08-07

Fixed

(rmcp) allow both content and structured content (#359)

0.4.0 - 2025-08-05

Added

[breaking] Add support for Tool.outputSchema and CallToolResult.structuredContent (#316)

Fixed

don't wrap errors in streamable http auth client (#353)
(prompt) remove unused code (#343)

0.3.2 - 2025-07-30

Fixed

(capabilities) do not serialize None as null for list_changed (#341)
(Transport) close oneshot transport on error (#340)
(oauth) expose OAuthTokenResponse publicly (#335)

0.3.1 - 2025-07-29

Fixed

use mimeType instead of mime_type for MCP specification compliance (#339)
return a 405 for GET and DELETE if stateful_mode=false (#331)
propagate tracing spans when spawning new tokio tasks (#334)
Explicitly added client_id as an extra parameter causes bad token requests (#322)

Other

Fix formatting in crate descriptions in README.md (#333)

0.3.0 - 2025-07-15

Added

unified error type (#308)
(transport) add builder & expose child stderr (#305)

Other

(deps) update schemars requirement from 0.8 to 1.0 (#258)
(rmcp) bump rmcp-macros version to match (#311)
fix packages used for server example (#309)

0.2.1 - 2025-07-03

Other

(docs) Minor README updates (#301)

0.2.0 - 2025-07-02

Added

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

Fixed

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

Other

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