tengu_tool_cgroup
A Claude Code feature flag, read out of the shipped bundle. No mined inventory carries it: everything below comes from what this site has written about it.
On Linux you can cap memory for shell commands so a runaway process cannot eat your machine.
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.233.
In the changelogs
3Releases whose published page names tengu_tool_cgroup.
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v2.1.246
Late attach, release and OOM-kill accounting for capped processes
Capped processes can be attached late, released, and have their out-of-memory kills counted; still off.
gate cited by this entry, found in this entry's text
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v2.1.246
Tool memory cgroups reworked, still off unless turned on
Memory caps on processes Claude starts were rebuilt but stay off unless you set the limit variable.
gate cited by this entry, found in this entry's text
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v2.1.233
Bash and PowerShell tools can run under a memory limit on Linux
On Linux you can cap memory for shell commands so a runaway process cannot eat your machine.
gate cited by this entry, found in this entry's text
Gate readings
0No release here has a gate table behind it for this flag. Most published releases have none at all: the readings exist only for versions the pipeline captured flag state on.
First cited
1The earliest release whose published evidence quoted tengu_tool_cgroup was v2.1.233, 14 Aug 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 feature flag does. All feature flags.