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Sweep 28 Aug 2026 · 00:00Z Build v2.1.250 478 read Stable v2.1.236 Latest v2.1.250 Next v2.1.250 Feeds RSS JSON llms.txt

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.

Reference / Feature flags

tengu_tool_memory_cgroup

A Claude Code feature flag, read out of the shipped bundle. It has been in the build since v2.1.233, including the newest one read.

What it is

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.

Presence across releases

ReleasesReadingDeclared typeDefault
2.1.245 – 2.1.250 5 releases never mined — —
2.1.233 – 2.1.243 11 releases in the build — bool:false

A row reading never mined is a release with no archived bundle behind it. Nothing was read out of it, so nothing here says whether the name was in it. A declared type or a default is only ever what that release's own bundle stated.

Gate readings

ReleaseResolvedThis accountAnonymousCompiled default
v2.1.246 Off in both readings off off not a boolean we can read
v2.1.239 Off in both readings off off on
v2.1.233 read on another version Off in both readings off off on

Two arms, because they disagree: this account is the one account this site reads and anonymous is a baseline with no identity attached. A reading says nothing about your account, and off cannot rule out a rollout both readings sit outside of. What these readings can and cannot show.

Changelog entries naming it

  1. v2.1.246Per-class memory caps on spawned processes, wired through but off for everything except Bash

    Memory limits now reach npm, git, tmux, LSP, MCP and hooks, but everything except Bash is excluded.

    gate cited by this entry

  2. v2.1.246Tool 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

  3. v2.1.239Per-tool memory limits detect an outer cgroup already in place

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

    gate cited by this entry

  4. v2.1.233Bash 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

Documentation pages

None of Anthropic's documentation pages this site has a copy of carries this name.

Names beside it

Every feature flag in the inventory starting tengu_tool, up to twelve of them.

tengu_tool_cgroupOn Linux you can cap memory for shell commands so a runaway process cannot eat your machine. never mined tengu_tool_cgroup_exclude_classesMemory limits now reach npm, git, tmux, LSP, MCP and hooks, but everything except Bash is excluded. never mined tengu_tool_pearNo description from anybody. 2.1.138 tengu_tool_result_dedupNo description from anybody. never mined tengu_tool_result_persistenceNo description from anybody. never mined tengu_tool_search_mode_decisionNo description from anybody. never mined tengu_tool_search_unsupported_modelsNo description from anybody. 2.1.138 tengu_tool_use_diff_computedWriting over a very large file skips diff computation, so it no longer stalls. never mined tengu_tool_use_granted_in_configNo description from anybody. never mined tengu_tool_use_show_permission_requestNo description from anybody. never mined tengu_tool_use_tool_result_mismatch_errorError reports about mismatched tool calls now scrub odd identifiers instead of sending them raw. 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.