Issues

• Follow-up to #454: validate --timeout before running scenarios

  modelcontextprotocol/conformance#539 · Filter by author yannvr opened on Oct 1, 2026

• everything-server: implement the tasks extension (io.modelcontextprotocol/tasks)

  modelcontextprotocol/conformance#536 · Filter by author dhruvtv opened on Sep 29, 2026

• dns-rebinding-protection: check Host and Origin validation separately

  enhancement
  modelcontextprotocol/conformance#535 · Filter by author ninadphalak opened on Sep 28, 2026

• everything-server: subscriptions/listen responds with newline-delimited JSON, not SSE

  modelcontextprotocol/conformance#531 · Filter by author dhruvtv opened on Sep 27, 2026
  1

• server-stateless: 500 ms whole-request deadline in no-log-without-loglevel reports slow servers as failures

  modelcontextprotocol/conformance#530 · Filter by author birbprophet opened on Sep 25, 2026

• server: sessions of failed scenarios are never closed (close() skipped on the error path)

  modelcontextprotocol/conformance#526 · Filter by author joshscott13 opened on Sep 25, 2026

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

  modelcontextprotocol/conformance#519 · Filter by author po-et opened on Sep 24, 2026

• Cover optional extension capability preservation in legacy initialize handshakes

  modelcontextprotocol/conformance#517 · Filter by author sambhav opened on Sep 23, 2026

• Server scenarios fail servers for capabilities they never declared

  modelcontextprotocol/conformance#516 · Filter by author sebastienrousseau opened on Sep 23, 2026

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

  modelcontextprotocol/conformance#515 · Filter by author sebastienrousseau opened on Sep 23, 2026
  1

• Surface reusable real-call collections alongside the conformance suite

  modelcontextprotocol/conformance#514 · Filter by author vijaydeepsinha opened on Sep 23, 2026

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

  bug
  modelcontextprotocol/conformance#513 · Filter by author panyam opened on Sep 22, 2026

• alpha-12 please?

  modelcontextprotocol/conformance#512 · Filter by author Randgalt opened on Sep 22, 2026
  1

• Everything-server rejects valid _meta on stateful initialize

  modelcontextprotocol/conformance#506 · Filter by author lucarlig opened on Sep 18, 2026
  1

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

  modelcontextprotocol/conformance#505 · Filter by author YS-OH-CORE opened on Sep 15, 2026
  1

• Bound client-suite concurrency for timing-sensitive SSE checks

  modelcontextprotocol/conformance#500 · Filter by author CharlesMcMillan opened on Sep 9, 2026

• Standardised test reporting

  enhancement
  modelcontextprotocol/conformance#486 · Filter by author ScottGuymer opened on Sep 3, 2026
  1

• tasks-lifecycle accepts completed status from its cancellable fixture

  modelcontextprotocol/conformance#485 · Filter by author 1fanwang opened on Sep 3, 2026

• feat(tier-check): support configurable label taxonomy and aliases for Tier 1 repo checks

  enhancement
  modelcontextprotocol/conformance#482 · Filter by author anubhav756 opened on Sep 1, 2026

• Add server conformance for SEP-2350 scope challenges

  modelcontextprotocol/conformance#480 · Filter by author SamMorrowDrums opened on Aug 31, 2026

• Optional Tool Outcome Attestation (TOA) verify gate for MCP CI / promote / register

  modelcontextprotocol/conformance#478 · Filter by author AgentStatus-Dev opened on Aug 30, 2026

• sep-2322 absent-resultType probe is an invalid stimulus on the 2026-07-28 wire it negotiates

  modelcontextprotocol/conformance#475 · Filter by author JosephDoUrden opened on Aug 30, 2026
  1

• Add initial conformance tests for Resource AS of EMA

  enhancement
  modelcontextprotocol/conformance#470 · Filter by author tnorimat opened on Aug 28, 2026
  3

  

• Shift config of "known-sdks.ts" to SDK-side config file

  enhancement
  modelcontextprotocol/conformance#460 · Filter by author chr-hertel opened on Aug 17, 2026

• tier-check spec-tracking does not detect SDK releases published shortly before the spec release

  modelcontextprotocol/conformance#459 · Filter by author maxisbey opened on Aug 17, 2026