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Streamable HTTP server accepts mismatched header/body protocol versions and negotiates 2024-11-05 on initialize

bugSomething is not workingSomething is not working

Status: Open.

#852 In modelcontextprotocol/rust-sdk;

· cclabadmin opened on May 16, 2026

Server accepts duplicate initialize after initialization, while Peer<RoleServer>::peer_info() remains unchanged

bugSomething is not workingSomething is not working

Status: Open.

#851 In modelcontextprotocol/rust-sdk;

· cclabadmin opened on May 15, 2026

Tool listing returns unnecessary fields

bugSomething is not workingSomething is not working

Status: Open.

#847 In modelcontextprotocol/rust-sdk;

· fpoli opened on May 13, 2026

RustSec advisory for GHSA-89vp-x53w-74fx?

Status: Open.

#846 In modelcontextprotocol/rust-sdk;

· hicksy opened on May 13, 2026

In stateless mode server response latest protocolVersion, not requested by clilent

bugSomething is not workingSomething is not working

Status: Open.

#841 In modelcontextprotocol/rust-sdk;

· pistata112 opened on May 9, 2026

Input validation errors returned as -32602 instead of isError (SEP-1303)

Status: Open.

#840 In modelcontextprotocol/rust-sdk;

· blackwell-systems opened on May 9, 2026

Clarify request-timeout semantics for progress notifications and long-running requests

Status: Open.

#834 In modelcontextprotocol/rust-sdk;

· ContextVM-org opened on May 5, 2026

More accessible auth error and avoid multiple types

enhancementNew feature or requestNew feature or request

Status: Open.

#795 In modelcontextprotocol/rust-sdk;

· thomasa88 opened on Apr 8, 2026

Support Oauth client secret

enhancementNew feature or requestNew feature or request

Status: Open.

#784 In modelcontextprotocol/rust-sdk;

· thomasa88 opened on Apr 1, 2026

Automatic repair invalid JSON formatted MCP messages generated by LLM

enhancementNew feature or requestNew feature or request

Status: Open.

#772 In modelcontextprotocol/rust-sdk;

· Evian-Zhang opened on Mar 23, 2026

StreamableHttpClientTransport hangs on call_tool when server uses json_response + stateless mode

Status: Open.

Bug

#754 In modelcontextprotocol/rust-sdk;

· EItanya opened on Mar 15, 2026

Conformance Testing

enhancementNew feature or requestNew feature or request

P1High: significant functionality gap or spec violationHigh: significant functionality gap or spec violation

Status: Open.

#684 In modelcontextprotocol/rust-sdk;

· alexhancock opened on Feb 24, 2026