Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
Plugin EvalArea: what it touches
Internal ChangesKind: in v2.1.269,
Internal ChangesSection of the release
What
Claude Code's internal evaluation harness (the "eval" system used for testing) now has two specific errors for when a mock MCP server (a stand-in for a real MCP server, used in testing) can't be started:
MockWithholdPolicyError: thrown when an organization's allowedMcpServers/deniedMcpServers policy would block the empty withholding stand-in from starting
MockEnterpriseExclusiveError: thrown when a machine's managed-mcp.json file gives the organization exclusive control over MCP servers, meaning eval mocks can't run on that machine at all
Why
This makes eval failures caused by enterprise MCP policy restrictions clearer and easier to diagnose, instead of failing in a generic or confusing way.
