Issues

• Invalid UTF-8 in MCP-Protocol-Version, Mcp-Method or Mcp-Name gives 500 instead of 400

  bug
  modelcontextprotocol/ruby-sdk#663 · Filter by author atesgoral opened on Nov 6, 2026

• Client::Stdio passes the whole parent environment to the server process

  bug
  modelcontextprotocol/ruby-sdk#662 · Filter by author atesgoral opened on Nov 6, 2026

• Elicitation results are not checked against requested_schema, but the docs say they match it

  bug
  modelcontextprotocol/ruby-sdk#661 · Filter by author atesgoral opened on Nov 6, 2026

• HTTP client sends handler exception messages back to the server

  bug
  modelcontextprotocol/ruby-sdk#660 · Filter by author atesgoral opened on Nov 6, 2026

• JWTVerifier answers 500 instead of 401 for a PS256 token when it verifies with an EC key (jwt < 3.3.0)

  bug
  modelcontextprotocol/ruby-sdk#659 · Filter by author atesgoral opened on Nov 6, 2026

• logging/setLevel from one session changes the log level of other sessions

  bug
  modelcontextprotocol/ruby-sdk#658 · Filter by author atesgoral opened on Nov 6, 2026

• Concurrent requests overwrite each other's instrumentation data

  bug
  modelcontextprotocol/ruby-sdk#657 · Filter by author atesgoral opened on Nov 6, 2026

• Support modelcontextprotocol/experimental-ext-triggers-events

  enhancement
  modelcontextprotocol/ruby-sdk#594 · Filter by author dwery opened on Oct 11, 2026
  

• SEP-2663: Tasks Extension

  enhancement
  modelcontextprotocol/ruby-sdk#391 · Filter by author localden opened on Jun 6, 2026