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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_dead_probe_daemon_origin_auto

A Claude Code feature flag, read out of the shipped bundle. It was in the build from v2.1.208 and was gone by v2.1.221.

What it is

Nobody has written a line about this one. It is not in any of Anthropic's reference tables and no changelog entry here carries a description of it. It is in the build, which is the whole of what this page can claim.

Presence across releases

ReleasesReadingDeclared typeDefault
2.1.245 – 2.1.250 5 releases never mined — —
2.1.221 – 2.1.243 22 releases not in the build — —
2.1.208 – 2.1.220 13 releases in the build — object

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

No 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.

Changelog entries naming it

No changelog entry here has ever named it. That is a statement about what has been written, not about the name: it has been in the build since v2.1.208 without anybody writing a line about it.

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_dead_probe, up to twelve of them.

tengu_dead_probe_Temporary probes that checked whether old code paths still ran have been deleted; behaviour is unchanged. never mined tengu_dead_probe_adopt_ticks_tokenOne-off counters now show which old code paths are still being used, so they can be removed. never mined tengu_dead_probe_autoupdater_statusVery old config files with legacy updater values now migrate to an unknown install method. never mined tengu_dead_probe_bg_legacy_opEach older background-session operation reports once, showing which legacy paths are still used. never mined tengu_dead_probe_enable_auto_mode_flagFive more leftover diagnostic probes were deleted, with no change to what you see. never mined tengu_dead_probe_hook_updated_mcp_tool_outputFive more leftover diagnostic probes were deleted, with no change to what you see. never mined tengu_dead_probe_include_coauthored_byOne-off counters now show which old code paths are still being used, so they can be removed. never mined tengu_dead_probe_install_counts_cleanupFive more leftover diagnostic probes were deleted, with no change to what you see. never mined tengu_dead_probe_iterm2_crash_restoreTwo new counters cover swept placeholder bridge sessions and iTerm2 crash-restore probes. never mined tengu_dead_probe_mcp_subsec_timeoutMost of the one-shot probes checking whether old code paths still run were removed. never mined tengu_dead_probe_pinned_sidecarMost of the one-shot probes checking whether old code paths still run were removed. never mined tengu_dead_probe_plugin_toplevel_experimentalMost of the one-shot probes checking whether old code paths still run were removed. 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.