Source Intelligence

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

/plugin gained a Stats tab and /skill-doctor moved into it

Not switched on
Useful4 Signal4
Plugins Notable not in their notes

A Stats tab in /plugin shows skill usage and context costs, with /skill-doctor redirecting there.

/plugin stats and the relocated /skill-doctor are built but sit behind CLAUDE_CODE_LANTERN_PRISM, off by default.

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

/plugin stats/skill-doctorCLAUDE_CODE_LANTERN_PRISM
What

The plugin UI has a new stats view showing skill usage and context costs, and /skill-doctor now redirects there.

Details
  • New "stats" view and a tab titled "Stats"; both /plugin stats and the marketplace argument parser route to it, with help line " /plugin stats - Show skill usage and context costs".
  • A notice tells users "/skill-doctor moved — skill usage and context costs now live in this Stats tab."
  • /skill-doctor is registered as two variants, an immediate local-jsx one that renders the view and the existing local one that produces plain text in non-interactive mode, both described as "Show which loaded skills are unused and costing context".
  • skill-doctor was added to the command log-level map as "info".
  • Gated on tengu_lantern_prism (fallback false) or the CLAUDE_CODE_LANTERN_PRISM env var; the skill-doctor registration now sits on the same gate as the Stats tab.
Evidence

/skill-doctor moved \u2014 skill usage and context costs now live in this Stats tab., skill usage and context costs now live in this Stats tab.

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 →