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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 v2.1.219

Dev and engine build versions collapsed before telemetry

Under the hood
Useful1 Signal0
Telemetry

Internal build versions get trimmed before metrics are sent, so daily builds report one value.

What

A version field matching a dev or engine build pattern has its .tNNN.shaXXXX suffix stripped before the metric is emitted, leaving x.y.z-dev.YYYYMMDD.

Details
  • Runs alongside the existing metric normalisations that collapse mcp__* tool names to mcp and unknown model names to other.
  • The effect is lower per-build cardinality, since every dev or engine build of the same day now reports one value rather than one per commit.
  • Not gated; applies to all builds that emit metrics.
Evidence

(?:dev|engine)

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

See this entry in the whole of v2.1.219 →