Source Intelligence

DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

All of v2.1.239 Home All releases olderv2.1.238 v2.1.240newer
Claude Code v2.1.239

Per-tool memory limits detect an outer cgroup already in place

Under the hood
Useful1 Signal2
Sandbox

On Linux, a tool already inside another tool's memory group is reported as nested instead of double-limited.

Feature flag
tengu_tool_memory_cgroup Off in both readings

The flag server returned off for the account this site reads and for the anonymous baseline. A reading of off cannot rule out a rollout these two readings sit outside of.

This account: off · anonymous baseline: off · compiled default in v2.1.239: on

Read once, for one account on one subscription tier, against v2.1.239. It isn't a statement about your account. What a flag value here can and cannot tell you

What

On Linux, setting up the memory limit for a tool now notices when the process is already inside another tool's memory group, clears the directory, logs it and reports the setup as nested rather than trying to nest a second limit.

Details
  • Setup is still guarded by tengu_tool_memory_cgroup when no explicit limit has been set.
  • Whether the system uses cgroup v2 is now recorded on the setup state.
Evidence

tool cgroup: covered by an outer tool cgroup

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.239 →