You'll noticeTier: how much it should matter to you
2Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
SkillsArea: what it touches
New FeaturesKind: in v2.1.251,
New FeaturesSection of the release
What
The built-in skill for writing evals gained a required step telling authors to stub every MCP tool call an eval can make, so evals never reach real MCP services.
Details
each tool gets a mock file under mocks/<server>/<tool>.md
flows that make several calls can use a single _server.md agent mock with an abort_when: list
Evidence
Step 3a — Mock the MCP servers
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
