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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 v2.1.220

Classifier beta-rejection latch still keys off a null placeholder

Not switched on
Useful2 Signal3
Permissions Notable

The automatic retry that would drop a rejected classifier beta can never trigger in this build.

The drop-on-400 latch for the auto-mode classifier beta is keyed on a constant that is null, so the branch and its telemetry are unreachable.

What

The path that drops a classifier beta after an HTTP 400 followed by a successful bare retry is keyed on a beta constant that is null in both builds, so it never fires.

Details
  • The latch bails out early when the constant is null, and the constant is declared as null in 2.1.219 and 2.1.220 alike.
  • The newly-sent auto-mode-classifier beta therefore has no automatic drop-on-400 path in this build.
  • The telemetry it would emit, tengu_auto_mode_beta_latch and permission_auto_mode_classifier, is present but unreachable.
Evidence

tengu_auto_mode_beta_latch

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

See this entry in the whole of v2.1.220 →