KillShell
A Claude Code tool, read out of the shipped bundle. No mined inventory carries it: everything below comes from what this site has written about it.
Tools now declare a backgrounding policy; most tools opt out of running in the background
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.277.
In the changelogs
5Releases whose published page names KillShell.
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v2.1.277
New per-tool "backgrounding" policy field, most tools opt out
Tools now declare a backgrounding policy; most tools opt out of running in the background
found in this entry's text
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v2.1.19
TaskStop Replaces KillShell
found in this entry's text
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v2.0.56
KillShell Tool
found in this entry's text
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v1.0.119
Code Quality Enhancements
found in this entry's text
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v1.0.60
Major Features
found in this entry's text
First cited
1The earliest release whose published evidence quoted KillShell was v2.1.19, 23 Jan 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
2Build by build
265One row per release since the first build this name was read out of. Absent means the build was read and the name was not in it, never mined means no bundle for that release was ever archived, and a declared type or a default is only ever what that release's own bundle stated.
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 tool does. All tools.