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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

"Dead probe" telemetry removed across several code paths

Under the hood
Useful1 Signal0
Telemetry

Temporary probes that checked whether old code paths still ran have been deleted; behaviour is unchanged.

What

One-shot instrumentation that existed only to check whether legacy code paths were still reachable has been deleted.

Details
  • Removes the preserved-segment probes at sites chain_relink, tail_pick, walk_resolve and sdk_ingest.
  • Removes the DISABLE_BUG_COMMAND probes and the TaskOutput legacy-parameter probe.
  • Surrounding logic is unchanged, including segment resolution and the disabling of /feedback; only the reporting is gone.
  • Grep confirms only two tengu_dead_probe_* events survive in this build.
Evidence

tengu_dead_probe_preserved_segment

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

See this entry in the whole of v2.1.221 →