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Sweep 22 Sep 2026 · 17:19Z Build v2.1.280 501 read Stable v2.1.267 Latest v2.1.280 Next v2.1.280 Feeds RSS JSON llms.txt Unofficial
Claude Code v2.1.265 ·

Built-in tool classification gets a special-case exception for one built-in name

One built-in tool now gets a special-case exception in the built-in vs MCP classification logic

TierUnder the hoodhow much it should matter to you
Useful1my rating, 1 to 5
Signal0worth watching, 1 to 5
AreaTooling Architecturewhat it touches
KindInternal Changesin v2.1.265,
Under the hood

One built-in tool now gets a special-case exception in the built-in vs MCP classification logic

What

The internal logic that classifies a tool as MCP (Model Context Protocol), built-in, or undefined now takes an extra input and adds a special case: if a tool's name matches one particular built-in tool and none of the extra input matches a specific identifier, it's classified as "built-in" even in a situation where it would otherwise have failed the general built-in check.

Why

This fixes a case where that particular tool could be misclassified, ensuring it's consistently recognized as a built-in tool.

How sure we are
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubtThe finding doesn't say which specific tool this exception applies to.

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