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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 v2.1.224

Telemetry forwarding now strips identifying fields and caps MCP event volume

Under the hood
Useful2 Signal2
Telemetry

Internal metrics forwarding strips identifying fields, buckets tool names and caps per-server MCP volume.

What

The internal metrics forwarder, reached only on first-party accounts, now removes a list of potentially identifying fields before sending, collapses tool and feature names into generic buckets, and limits how often per-server MCP events can be sent.

Details
  • Deleted fields include the MCP server base URL and name, the MCP tool name, a hashed error message, and two hashed skill names.
  • Any tool name collapses to mcp when the event is flagged as MCP, where previously only names beginning with mcp__ were collapsed. Names beginning with skill__ become skill, and feature names beginning with tool_skill_ become tool_skill, except tool_skill_tool.
  • Five MCP events are capped at 10 forwards per 60 second window per server, tracked across at most 200 server keys, and the count suppressed since the last send rides along as droppedSinceLastForward.
Evidence

stripPiiFieldsForDatadog

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

See this entry in the whole of v2.1.224 →