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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.221

New MCP policy-predicate telemetry for allowedMcpServers matching

Under the hood
Useful2 Signal0
MCP

Claude now tracks whether your allowed-MCP-server rules could actually be evaluated.

allowedMcpServers
What

Matching a server against allowedMcpServers now reports, once per session, whether the predicate could be evaluated.

Details
  • A successful match reports "ok".
  • Unresolved variables in a policy command or URL report "missing_policy_var".
  • An unsafe URL expansion reports "unsafe_expansion".
  • All reported under the metric name mcp_policy_predicate.
Evidence

mcp_policy_predicate

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

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.221 →