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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 v2.1.225

Experiment-exposure telemetry gains variation_key and stops padding empty strings

Under the hood
Useful1 Signal0
Telemetry

Experiment tracking records which variation you got and omits blank optional fields.

What

Experiment events now record which variation was seen, and absent optional fields are omitted rather than sent as empty strings.

Details
  • Adds a variation_key field to the experiment event schema.
  • user_attributes and experiment_metadata default to undefined instead of "".
  • The same treatment applies to the generic event's process and additional_metadata fields.
Evidence

variation_key

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

See this entry in the whole of v2.1.225 →