tengu_propose_skills
A Claude Code feature flag, read out of the shipped bundle. It was in the build from v2.1.212 and was gone by v2.1.251.
An env var turns on the tool that proposes new skills; otherwise it stays off in this build.
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.233.
In the changelogs
3Releases whose published page names tengu_propose_skills.
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v2.1.290
More usage events and two hosting environment variables are now recognised
Claude Code's lists of allowed usage events and host environment variables gain entries about MCP, skills and hosted setups
gate cited by this entry
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v2.1.251
Skill proposals no longer behind a remote flag
Skill proposals no longer need a server flag; two environment variables now decide.
gate cited by this entry, found in this entry's text
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v2.1.233
CLAUDE_CODE_SKILL_PROPOSALSturns on the skill-proposal toolAn env var turns on the tool that proposes new skills; otherwise it stays off in this build.
gate cited by this entry, found in this entry's text
Gate readings
2| Release | Resolved | This account | Anonymous | Compiled default |
|---|---|---|---|---|
| v2.1.251 | Not enough to say | no value returned | no value returned | not a boolean we can read |
| v2.1.233 read on another version | Not enough to say | no value returned | no value returned | off |
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.
First cited
1The earliest release whose published evidence quoted tengu_propose_skills was v2.1.251, 28 Aug 2026. That is the oldest release this project wrote about it, so it is a floor on the name's age and not the release that introduced it. It is not a presence reading: which builds carried the name is the table below.
Presence across releases
2Build by build
85One row per release since the first build this name was read out of. Absent means the build was read and the name was not in it, never mined means no bundle for that release was ever archived, and a declared type or a default is only ever what that release's own bundle stated.
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.