Sweep 19 Sep 2026 · 02:36Z Build v2.1.278 500 read Stable v2.1.267 Latest v2.1.278 Next v2.1.278 Feeds RSS JSON llms.txt Unofficial
Claude Code v2.1.277 ·

PreToolUse hook warnings identify the tool generically, not by literal name

PreToolUse hook warnings now name tools generically instead of by their literal name

TierUnder the hoodhow much it should matter to you
Useful1my rating, 1 to 5
Signal1worth watching, 1 to 5
AreaHookswhat it touches
KindInternal Changesin v2.1.277,
Under the hood

PreToolUse hook warnings now name tools generically instead of by their literal name

What

PreToolUse hooks (which run before a tool call executes and can block it) can return permissionDecision=defer. Warnings shown when this happens in interactive mode, or when multiple tool calls are batched together, now identify the tool using a generic classifier rather than printing its raw name.

Why

This keeps the warning informative without exposing the literal tool name, consistent with similar changes to other tool-related log messages.

See this entry in the whole of v2.1.277 →