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Add configuration to enable/disable "transparent session re-init on HTTP 404"

enhancementNew feature or requestNew feature or request

Status: Open.

#755 In modelcontextprotocol/rust-sdk;

· glicht opened on Mar 15, 2026

StreamableHttpClientTransport hangs on call_tool when server uses json_response + stateless mode

Status: Open.

#754 In modelcontextprotocol/rust-sdk;

· EItanya opened on Mar 15, 2026

stdio server drops in-flight tool responses when stdin closes

Status: Open.

#753 In modelcontextprotocol/rust-sdk;

· coryvirok opened on Mar 15, 2026

reqwest streamable HTTP client drops JSON-RPC error bodies on HTTP 4xx into TransportSend

bugSomething is not workingSomething is not working

Status: Open.

#724 In modelcontextprotocol/rust-sdk;

· adam-r-kowalski opened on Mar 4, 2026

Reduce boilerplate: derive/default ServerHandler for simple tool servers

enhancementNew feature or requestNew feature or request

Status: Open.

#711 In modelcontextprotocol/rust-sdk;

· sco3 opened on Mar 1, 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

Implement SEP-990: Enterprise Managed Authorization (Extension)

enhancementNew feature or requestNew feature or request

P2Medium: important but non-blocking improvementMedium: important but non-blocking improvement

T-securitySecurity-related changesSecurity-related changes

Status: Open.

#531 In modelcontextprotocol/rust-sdk;

· felixweinberger opened on Nov 7, 2025

Implement SEP-1649: MCP Server Cards (.well-known Discovery)

enhancementNew feature or requestNew feature or request

P3Low: nice-to-have, long-term, or exploratoryLow: nice-to-have, long-term, or exploratory

T-transportTransport layer changesTransport layer changes

Status: Open.

#527 In modelcontextprotocol/rust-sdk;

· felixweinberger opened on Nov 7, 2025

Implement SEP-1442: Make MCP Stateless

enhancementNew feature or requestNew feature or request

P2Medium: important but non-blocking improvementMedium: important but non-blocking improvement

T-coreCore library changesCore library changes

Status: Open.

#526 In modelcontextprotocol/rust-sdk;

· felixweinberger opened on Nov 7, 2025

Custom disabling of specific tools

enhancementNew feature or requestNew feature or request

P2Medium: important but non-blocking improvementMedium: important but non-blocking improvement

T-macrosMacro changesMacro changes

Status: Open.

#477 In modelcontextprotocol/rust-sdk;

· bogzbonny opened on Oct 7, 2025

The abstract method uses which under the hood.

bugSomething is not workingSomething is not working

needs reproBug report that needs a minimal reproduction caseBug report that needs a minimal reproduction case

P2Medium: important but non-blocking improvementMedium: important but non-blocking improvement

T-transportTransport layer changesTransport layer changes

Status: Open.

#456 In modelcontextprotocol/rust-sdk;

· AdsQnn opened on Sep 25, 2025

Discussion: Moving the type definitions into its own crate

enhancementNew feature or requestNew feature or request

P2Medium: important but non-blocking improvementMedium: important but non-blocking improvement

T-modelModel/data structure changesModel/data structure changes

Status: Open.

#449 In modelcontextprotocol/rust-sdk;

· AhegaoBurger opened on Sep 22, 2025