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Sweep 22 Oct 2026 · 04:32Z Build v2.1.308 527 read Stable v2.1.308 Latest v2.1.308 Next v2.1.308 Feeds RSS JSON llms.txt llms-full.txt Unofficial
HomeReleasesv2.1.219entry #9

Claude Code v2.1.219 ·

Skill usage stats surface expanded

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

Nothing to try yet Notable In Development
JSON All of v2.1.219
Nothing to try yetTier: how much it should matter to you
3Useful: my rating, 1 to 5
4Signal: worth watching, 1 to 5
PluginsArea: what it touches
In DevelopmentKind: in v2.1.219,
What probably matters to youSection of the release

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

Read from
Names in the bundle/skill-doctor/pluginCLAUDE_CODE_LANTERN_PRISM
Feature flag
tengu_lantern_prism Off by default, switched on for this account

The shipped code defaults this off, and the flag server returned on for the one account this site reads on this version. That is the reading that makes the entry above worth a second look, and it still says nothing about your account.

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

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

What has happened since
Flag reading moved The flag server now returns on for tengu_lantern_prism, read as this account. A reading is one sample. Claude Code evaluates its flags remotely, so no client sees the targeting rule behind a value and this says nothing about your account.
Flag reading moved The flag server now returns off for tengu_lantern_prism, read as this account. A reading is one sample. Claude Code evaluates its flags remotely, so no client sees the targeting rule behind a value and this says nothing about your account.
Flag reading moved The flag server now returns on for tengu_lantern_prism, read as this account. A reading is one sample. Claude Code evaluates its flags remotely, so no client sees the targeting rule behind a value and this says nothing about your account.
Flag reading moved The flag server now returns nothing at all, having stopped carrying it for tengu_lantern_prism, read as this account. A reading is one sample. Claude Code evaluates its flags remotely, so no client sees the targeting rule behind a value and this says nothing about your account.

See this across every release →

See this entry in the whole of v2.1.219 →

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