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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 v2.1.37

2 entries read diff v2.1.36 → v2.1.37 Markdown

This is a maintenance release with internal performance optimizations for Fast mode. There are no user-facing feature changes.

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Changesopen

Fast Mode Status Caching#

The fast mode status check now caches results for 30 seconds to reduce redundant API calls. When you rapidly toggle fast mode or navigate between sessions, the CLI will reuse recent status checks rather than querying the server each time.

Evidence

Prefetch debouncing with 30-second interval (search for "Skipping penguin mode prefetch, fetched recently")

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

Fast Mode Command Responsiveness#

The /fast command now includes a 300ms timeout for the status prefetch, ensuring the command remains responsive even when the API is slow.

Evidence

Timeout with telemetry tracking (search for "tengu_fast_mode_prefetch_timeout")

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

Verbatim
Official · Anthropic

Anthropic’s official release notes

Published verbatim by Anthropic for v2.1.37. Text is unmodified from the upstream changelog. Everything else on this page came out of the bundle instead, which is why the two lists don't match.

  • Fixed an issue where /fast was not immediately available after enabling /extra-usage
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System prompt

The system prompt was not captured for this release, so this page cannot say whether it moved.

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