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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_speculation_overlay

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.

What it is

Five more leftover diagnostic probes were deleted, with no change to what you see.

Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.221.

Presence across releases

The 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.

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

  1. v2.1.221Five dead-code probes removed

    Five more leftover diagnostic probes were deleted, with no change to what you see.

    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_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_daemon_origin_autoNo description from anybody. 2.1.208 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

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.