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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.

← All of v2.1.219 Home All releases ←olderv2.1.218 v2.1.220newer→
Claude Code v2.1.219

Skill usage stats surface expanded

Not switched on
Useful3 Signal4
Plugins Notable

A skills stats tab can report unused skills, and /skill-doctor gains a version that works without an interactive UI.

The Stats tab and non-interactive /skill-doctor sit behind tengu_lantern_prism, fallback false, or CLAUDE_CODE_LANTERN_PRISM.

Feature flag
tengu_lantern_prism Off in both readings

The flag server returned off for the account this site reads and for the anonymous baseline. A reading of off cannot rule out a rollout these two readings sit outside of.

This account: off · anonymous baseline: off · compiled default in v2.1.219: on

These values were read against a different version of Claude Code, so treat them as the nearest reading available instead of one taken on this release.

Read once, for one account on one subscription tier, against v2.1.219. It isn't a statement about your account. What a flag value here can and cannot tell you

/skill-doctor/pluginCLAUDE_CODE_LANTERN_PRISM
What

The Stats tab in the /plugin dialog now receives the context it needs to report unused skills, and a non-interactive variant of /skill-doctor is registered.

Details
  • the tab is handed a getSkillStatsInputs callback supplying commands, MCP commands and clients, agent id, main-loop model and permission mode
  • rendering the tab without that callback throws "Stats tab rendered without getSkillStatsInputs"
  • a second /skill-doctor command variant is registered alongside the existing JSX one, marked supportsNonInteractive and dispatching after text
  • still behind tengu_lantern_prism (fallback false) or the CLAUDE_CODE_LANTERN_PRISM environment variable
Evidence

Show which loaded skills are unused and costing context

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.219 →