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CI does not smoke-test client CLI path; everything-client drift on elicitation-sep1034-client-defaults and sse-retry

bugSomething isn't workingSomething isn't working

Status: Open.

#345 In modelcontextprotocol/conformance;

· canardleteer opened on Jun 17, 2026

http-custom-headers scenario puts x-mcp-header on type:"number" params (forbidden by SEP-2243)

Status: Open.

#344 In modelcontextprotocol/conformance;

· halter73 opened on Jun 17, 2026

dns-rebinding-protection client never sends notifications/initialized after a successful initialize (2025-11-25 path)

Status: Open.

#338 In modelcontextprotocol/conformance;

· tomtom215 opened on Jun 11, 2026

Add SEP-2567 (sessionless Streamable HTTP) conformance coverage

Status: Open.

#332 In modelcontextprotocol/conformance;

· felixweinberger opened on Jun 8, 2026

SEP-2243: ServerRejectsMissingMethodHeader contradicts TypeScript SDK behavior

Status: Open.

#323 In modelcontextprotocol/conformance;

· caomengxuan666 opened on May 29, 2026

caching scenario should use DRAFT-2026-v1

bugSomething isn't workingSomething isn't working

Status: Open.

#315 In modelcontextprotocol/conformance;

· Randgalt opened on May 24, 2026

server-stateless doesn't set mcp-method etc.

bugSomething isn't workingSomething isn't working

Status: Open.

#312 In modelcontextprotocol/conformance;

· Randgalt opened on May 23, 2026

SEP-2575: remaining conformance tests

Status: Open.

#296 In modelcontextprotocol/conformance;

· pcarleton opened on May 20, 2026

initialize scenario test server violates specification causing client failure

bugSomething isn't workingSomething isn't working

Status: Open.

#274 In modelcontextprotocol/conformance;

· kubinio123 opened on May 14, 2026

Add SEP-2575 conformance tests

Status: Open.

#266 In modelcontextprotocol/conformance;

· Yuan325 opened on May 12, 2026

Add SEP-2663 Tasks Extension conformance scenarios

Status: Open.

#261 In modelcontextprotocol/conformance;

· panyam opened on May 5, 2026

Add support for a stdio testing

enhancementNew feature or requestNew feature or request

Status: Open.

#258 In modelcontextprotocol/conformance;

· remyleone opened on Apr 29, 2026