describeTool
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.
New model guidance tells Claude to learn connector tool argument and result shapes carefully before publishing a page that uses them
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.273.
In the changelogs
3Releases whose published page names describeTool.
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v2.1.318
Internal builds show local script tasks in the background task list
In internal builds only, the background task list can show local script tasks, with a matching list of allowed built-in tool names
found in this entry's text
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v2.1.273
New guidance text on learning connector-tool schemas before publishing
New model guidance tells Claude to learn connector tool argument and result shapes carefully before publishing a page that uses them
found in this entry's text
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v2.1.273
New MCP connector schema-reading guidance for Claude Docs/Artifacts
New guidance tells Claude to read MCP connector tool schemas rather than guess argument names or result shapes
named in this entry, found in this entry's text
First cited
1The earliest release whose published evidence quoted describeTool was v2.1.273, 15 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.
Presence across releases
0The 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.