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Sweep 10 Nov 2026 · 02:18Z Build v2.1.322 539 read Stable v2.1.311 Latest v2.1.322 Next v2.1.322 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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Claude Code v2.1.277 ·

Skills and commands are now marked as builtin to resolve name collisions

Claude Code's own bundled skills and commands are now flagged so name clashes with user or plugin ones resolve predictably

Group of 2 Under the hood Internal Changes
JSON All of v2.1.277
Under the hoodTier: how much it should matter to you
2Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
Slash CommandsArea: what it touches
Internal ChangesKind: in v2.1.277,
Internal ChangesSection of the release

What

  • The reload_skills response the CLI sends now includes a builtin: true field on each skill entry whose resolved name matches one of Claude Code's own bundled skills.
  • The schema describing an available skill or command gained an optional builtin boolean, true only for Claude Code's own built-in commands, used to decide which command a bare /name invocation runs when a user, project, plugin, and MCP command all share the same name.

Why

This removes ambiguity when a skill or command name collides with one of Claude Code's own: it's now possible to tell that a /name invocation is running the built-in version rather than a same-named user, project, plugin, or MCP one.

Read from
Names in the bundlebuiltin
Since it was published

The entry above is what we published on the day. These lines were added later, as Anthropic's own pages caught up, and they sit beside the original rather than replacing it.

Added since A small documentation edit on Built-in browser and Claude in Chrome touched a line naming builtin after this was published. [`builtinBrowserDefaultDomainPolicy`](/docs/third-party/claude-desktop/configuration#builtinbrowserdefaultdomainpolicy) decides whether Claude can open every site except the ones you block, or only the sites you allow. Under either value, … third-party/claude-desktop/browser see the edit
Confirmed since Anthropic's documentation has since written up builtin, on Telemetry and egress. | Web Fetch domain check in [Code](/docs/third-party/claude-desktop/code) sessions | The hostname of each page Claude Code fetches, sent to `api.anthropic.com` before the fetch. See [Web Fetch](/docs/third-party/claude-desktop/web-tools#we… third-party/claude-desktop/telemetry see the edit
How sure we are
One source agreesOne thing we can check says the same as this entry.
Anthropic's documentation agreesAnthropic's documentation has since written up builtin, on Telemetry and egress.

See this entry in the whole of v2.1.277 →

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