Follow Discord
Sweep 22 Oct 2026 · 04:32Z Build v2.1.308 527 read Stable v2.1.308 Latest v2.1.308 Next v2.1.308 Feeds RSS JSON llms.txt llms-full.txt Unofficial

Claude Code v2.1.242 ·

Eval graders can inspect calls made to mock tools

Eval graders can inspect the calls that hit mock tools during a run.

You'll notice No documentation found New Features
JSON All of v2.1.242
You'll noticeTier: how much it should matter to you
1Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
ElsewhereArea: what it touches
New FeaturesKind: in v2.1.242,
New FeaturesSection of the release
What

A grader can now check the tool calls that hit mock stand-ins during an eval run. If no mocks applied, the grader gets an explicit reason instead of empty data. The note about plugins in an eval directory was also tightened.

Details
  • Requires --mocks; without it, or when no mocks/ directory applies to the case, the grader is told mock stand-ins were not active in that run.
  • The eval directory note now always says the plugin is not loaded unless you name its directory, and states that naming a directory counts as consent to load it.
  • Resolving a suite path also records the directory that consent was granted for.
Evidence

no mock stand-ins were active in this run (--mocks off, or no mocks/ directory applies to this case)

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Read from
Names in the bundle--mocks
Since it was published

The entry above is what we published on the day. These lines were added later, as Anthropic's own pages caught up, and they sit beside the original rather than replacing it.

Confirmed since Anthropic's documentation has since written up --mocks, on Plugins reference. | `--mocks <mode>` | `record` or `off`. See [Mock MCP servers](/docs/en/plugin-evals#mock-mcp-servers) | `record` | plugins-reference see the edit
How sure we are
Two sources agreeTwo things we can check say the same as this entry.
Anthropic's documentation agreesAnthropic's documentation has since written up --mocks, on Plugins reference.
The name it cites is new in this buildNew in this build: --mocks

See this entry in the whole of v2.1.242 →

Feedback