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Sweep 09 Oct 2026 · 17:27Z Build v2.1.296 517 read Stable v2.1.287 Latest v2.1.296 Next v2.1.296 Feeds RSS JSON llms.txt llms-full.txt Unofficial
Home / Reference / Settings keys

builtinTools

setting never mined JSON

A Claude Code settings key, read out of the shipped bundle. No mined inventory carries it: everything below comes from what this site has written about it.

A builtinTools option is now passed on to the session along with the allowed and disallowed tool lists

Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.296.

First seen — never in a mined build
Last seen — never in a mined build
Builds0 / 139on this box, as of v2.1.296
Written about v2.1.296 first named in a changelog, 9 Oct 2026

In the changelogs

2

Releases whose published page names builtinTools.

  1. v2.1.296
    The builtinTools option now carries through to the session

    A builtinTools option is now passed on to the session along with the allowed and disallowed tool lists

    named in this entry, found in this entry's text

  2. v2.1.296
    set_model can now fail with a model_not_current reason

    set_model gains a model_not_current error reason, and cloud session creation no longer sends the builtinTools field

    found in this entry's text

First cited

3

The earliest release whose published evidence quoted builtinTools was v2.1.285, 29 Sep 2026. That is the oldest release this project wrote about it, so it is a floor on the name's age and not the release that introduced it. It is not a presence reading: which builds carried the name is the table below.

ReleaseDateThe span that was quoted
v2.1.28529 Sep 2026builtin_tools: e.builtinTools
v2.1.2969 Oct 2026builtinTools: s.builtinTools
v2.1.2969 Oct 2026builtin_tools_count: s.builtinTools?.length ?? 0

Presence across releases

0

The miner has never read a build containing this name. It is here because a changelog entry of ours names it, which is evidence that it existed and not evidence of which releases carried it. The inventory starts at v2.1.138 and everything older than that was never mined.

Read out of the published npm bundle release by release, and out of Anthropic's own documentation as this site captured it. Nothing on this page is a description anybody here wrote about what the settings key does. All settings keys.

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