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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_api_query

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

Query and result telemetry now carry a proactivity level field from your session.

Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.233.

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. v2.1.233API telemetry records the proactivity level

    Query and result telemetry now carry a proactivity level field from your session.

    gate cited by this entry

  2. v2.1.233Proactivity level wired into API request telemetry but never set

    Request telemetry has a slot for a proactivity level, but it is always empty.

    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_api, up to twelve of them.

tengu_api_cache_breakpointsNo description from anybody. never mined tengu_api_no_response_timeoutHung requests are aborted when headers never arrive, and you can tune the window. never mined tengu_api_subagent_model_not_foundA subagent failing on a missing model now tells you exactly which model was sent. never mined tengu_api_successAPI success and error telemetry now includes your session's proactivity level. never mined tengu_api_unrecognized_modelYou get a one-time warning line if a query names a model Claude Code does not recognise. 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.