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Sweep 03 Nov 2026 · 22:27Z Build v2.1.318 536 read Stable v2.1.311 Latest v2.1.318 Next v2.1.318 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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Claude Code v2.1.317 ·

SDK tool results can say which built-in tool produced them

Tool results sent to SDK programs can now carry an optional field naming the built-in Claude Code tool that produced them

Under the hood Internal Changes
JSON All of v2.1.317
Under the hoodTier: how much it should matter to you
2Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
SDKArea: what it touches
Internal ChangesKind: in v2.1.317,
Internal ChangesSection of the release

Unclear Which built-in tools fill in this value is not stated, so an SDK program cannot yet rely on finding it for any given tool.

What

The SDK lets other programs run Claude Code and read what it does. Each tool result it sends them carries some display information. That information can now include an optional built_in_tool value. This value names the built-in Claude Code tool whose own completed run produced the result.

Why

A program built on the SDK can use this to react to the results of specific built-in tools.

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 doubtWhich built-in tools fill in this value is not stated, so an SDK program cannot yet rely on finding it for any given tool.

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