MCP session expiry and auto-reconnect handling

Fixes on record

Merged to main. A stamp counts the issues a fix is linked to.

• #19380 fix(mcp): reconnect on terminated sessions

  merged to main

  files: tests/tools/test_mcp_tool_session_expired.py, tools/mcp_tool.py

  Show the diff

  • tests/tools/test_mcp_tool_session_expired.py

    @@ -46,6 +46,13 @@ def test_is_session_expired_detects_session_not_found():
         assert _is_session_expired_error(RuntimeError("Unknown session: abc123")) is True
     
     
    +def test_is_session_expired_detects_session_terminated():
    +    """Remote Playwright MCP reports transport loss as ``Session terminated``."""
    +    from tools.mcp_tool import _is_session_expired_error
    +
    +    assert _is_session_expired_error(RuntimeError("Session terminated")) is True
    +
    +
     def test_is_session_expired_is_case_insensitive():
         """Match uses lower-cased comparison so servers that emit the
         message in different cases (SDK formatter quirks) still trigger."""

  • tools/mcp_tool.py

    @@ -1667,6 +1667,7 @@ async def _recover():
         "session expired",
         "session not found",
         "unknown session",
    +    "session terminated",
     )