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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 v2.1.61

Built-in tools no longer deferred by default

What

Built-in tools marked as deferrable (e.g., Bash, Read, WebFetch, Task tools, etc.) are no longer automatically deferred based on usage frequency. Previously, if you hadn't used a tool recently (usage score below a threshold), it could be hidden and require discovery through the ToolSearch tool before use. Now all built-in tools are loaded and available immediately.

Details
  • The tengu_coral_whistle feature flag default was changed from enabled (!0) to disabled (!1) in the tool deferral check
  • MCP (Model Context Protocol) tools remain always deferred — they still require ToolSearch to discover and load
  • Tool usage tracking remains active (the usage recording path is unchanged), suggesting data is still being collected for future improvements
  • The server can still enable usage-based deferral via the feature flag if needed
Evidence

Tool deferral gate function WG() (search for "tengu_coral_whistle") — default changed from !0 to !1 at line ~246691

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

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.61 →