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Sweep 22 Oct 2026 · 04:32Z Build v2.1.308 527 read Stable v2.1.308 Latest v2.1.308 Next v2.1.309 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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Claude Code v2.1.274 ·

Fast mode gating and per-session opt-in logic reworked

Claude Code reworked how fast mode ('penguin mode') decides organization eligibility and per-session opt-in

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Unclear Whether tengu_penguins_off is enabled is unread and not established by this finding.

What

The logic controlling fast mode (internally called "penguin mode") was changed in a few ways:

  • Organization-status handling for fast mode is now split depending on whether the session is an SDK-style context, using new helper logic.
  • A per-session opt-in check gained a sessionOnly parameter.
  • A new auto-trigger prefetches the organization's fast-mode status whenever settings show fastMode=true but the org status is still pending or assumed disabled.
  • Separately, the policy override gate for fast mode now applies whenever policySettings.fastMode === false, even if the caller did not explicitly request fast mode for that request; previously this override only took effect when fast mode had already been requested.

Why

These changes make fast-mode eligibility checks more consistent across SDK and non-SDK contexts and ensure an organization policy that disables fast mode is enforced even when a particular request didn't ask for fast mode, closing a gap where the override could be skipped.

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