tengu_tool_cpu_by_phase
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.
Remote sessions now report per-phase CPU usage split between CLI and tool subprocesses.
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.261.
In the changelogs
4Releases whose published page names tengu_tool_cpu_by_phase.
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v2.1.273
Per-tool CPU accounting now split by phase via a dedicated file
Claude Code now tracks CPU usage per phase for individual shell tool calls
gate cited by this entry, found in this entry's text
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v2.1.269
bg_tasks_report_running telemetry field now normalized, default-on
The bg_tasks_report_running telemetry field now defaults to on instead of logging a raw, possibly blank value
gate cited by this entry, found in this entry's text
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v2.1.265
cgroup CPU accounting rewritten to read cpuacct.usage directly, adds shell CPU tracking
CPU telemetry now reads cgroup usage from a fixed path and adds a new shell CPU time metric
gate cited by this entry, found in this entry's text
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v2.1.261
New per-phase CPU telemetry, gated behind CLAUDE_CODE_REMOTE
Remote sessions now report per-phase CPU usage split between CLI and tool subprocesses.
named in this entry, found in this entry's text, gate cited by this entry
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
2The earliest release whose published evidence quoted tengu_tool_cpu_by_phase was v2.1.261, 4 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 feature flag does. All feature flags.