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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_agent_list_attach

A Claude Code feature flag, read out of the shipped bundle. It was in the build from v2.1.138 and was gone by v2.1.178.

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 — —
2.1.178 – 2.1.243 59 releases not in the build — —
2.1.138 – 2.1.177 36 releases in the build — bool:false

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

ReleaseResolvedThis accountAnonymousCompiled default
v2.1.178 read on another version Off in both readings off off not a boolean we can read
v2.1.84 read on another version Off in both readings off off no gate table built for this version

Two arms, because they disagree: this account is the one account this site reads and anonymous is a baseline with no identity attached. A reading says nothing about your account, and off cannot rule out a rollout both readings sit outside of. What these readings can and cannot show.

Changelog entries naming it

  1. v2.1.178

    gate cited by this entry

  2. v2.1.84Agent List in System Messages [Gradual Rollout]

    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_agent, up to twelve of them.

tengu_agent_hooks_origin_untrustedAgents in untrusted folders can no longer define inline MCP servers; trust the project to allow it. never mined tengu_agent_proxy_download_queueDownload backlog on the agent proxy is now reported as a telemetry event. never mined tengu_agent_tool_selectedSDK result messages now include a summary of the subagents your session started. never mined tengu_agent_worktree_cwd_escape_blockedAgent commands now have a concrete worktree boundary, so escapes get blocked with a clearer log line. 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.