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http-custom-header-server-validation: no case sends an empty x-mcp-header value

Status: Open.

#519 In modelcontextprotocol/conformance;

· po-et opened on Sep 24, 2026

Cover optional extension capability preservation in legacy initialize handshakes

Status: Open.

#517 In modelcontextprotocol/conformance;

· sambhav opened on Sep 23, 2026

Server scenarios fail servers for capabilities they never declared

Status: Open.

#516 In modelcontextprotocol/conformance;

· sebastienrousseau opened on Sep 23, 2026

tools-call-simple-text passes when the tool does not exist

Status: Open.

#515 In modelcontextprotocol/conformance;

· sebastienrousseau opened on Sep 23, 2026

Surface reusable real-call collections alongside the conformance suite

Status: Open.

#514 In modelcontextprotocol/conformance;

· vijaydeepsinha opened on Sep 23, 2026

sep-2640.yaml is extracted at a pre-Final revision of the SEP

bugSomething isn't workingSomething isn't working

Status: Open.

#513 In modelcontextprotocol/conformance;

· panyam opened on Sep 22, 2026

alpha-12 please?

Status: Open.

#512 In modelcontextprotocol/conformance;

· Randgalt opened on Sep 22, 2026

Everything-server rejects valid _meta on stateful initialize

Status: Open.

#506 In modelcontextprotocol/conformance;

· lucarlig opened on Sep 18, 2026

request-state-complete accepts tool-error results and completions missing its documented state-ok marker

Status: Open.

#505 In modelcontextprotocol/conformance;

· YS-OH-CORE opened on Sep 15, 2026

Bound client-suite concurrency for timing-sensitive SSE checks

Status: Open.

#500 In modelcontextprotocol/conformance;

· CharlesMcMillan opened on Sep 9, 2026

Standardised test reporting

enhancementNew feature or requestNew feature or request

Status: Open.

#486 In modelcontextprotocol/conformance;

· ScottGuymer opened on Sep 3, 2026

tasks-lifecycle accepts completed status from its cancellable fixture

Status: Open.

#485 In modelcontextprotocol/conformance;

· 1fanwang opened on Sep 3, 2026