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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_velvet_anchor

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

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

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. v2.1.92Rerun Command Aliases [In Development]

    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_velvet, up to twelve of them.

tengu_velvet_cascadeWhich models get the simple system prompt is now decided locally, not by remote config. 2.1.138 tengu_velvet_falcon_modelNo description from anybody. 2.1.163 tengu_velvet_hammerNo description from anybody. 2.1.166 tengu_velvet_harbor_owlA startup banner pitching Claude Enterprise to org admins exists but no one sees it by default. 2.1.238 tengu_velvet_ibisMAX_MCP_OUTPUT_TOKENS is still honoured first, but it's no longer sanity-checked as a number. 2.1.138 tengu_velvet_malletAn alternate prompt wording for two tools exists but stays off unless you set an environment variable. 2.1.166 tengu_velvet_mothNo description from anybody. 2.1.138 tengu_velvet_staticNo description from anybody. 2.1.138 tengu_velvet_tideWhich models get the simple system prompt is now decided locally, not by remote config. 2.1.210

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.