Under the hoodTier: how much it should matter to you
2Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
MCPArea: what it touches
ImprovementsKind: in v2.1.234,
ImprovementsSection of the release
What
When an MCP server sends neither a response nor progress before the idle timeout, the resulting error now carries mcpErrorSource: "downstream_unreachable", joining the existing "downstream_error" and "user_auth" sources. Both MCP client code paths are covered.
Evidence
mcpErrorSource: "downstream_unreachable"
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
