Source Intelligence
Follow Discord

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 v2.1.76 Home All releases ←olderv2.1.75 v2.1.77newer→
Claude Code v2.1.76

Bundled Skill Reference Files

What

Built-in skills can now declare reference files that are extracted to a temporary directory at runtime, making them available for the skill prompt to reference.

Details
  • Skills define a files property in their registration, mapping relative paths to file content
  • Files are extracted to a per-skill directory inside the Claude Code data directory
  • Path traversal is blocked (bundled skill file path escapes skill dir: error)
  • Files are written with O_NOFOLLOW to prevent symlink attacks
  • The skill prompt is prefixed with Base directory for this skill: <path>
Evidence

Bundled skill file extraction (search for "Bundled skill reference files are allowed for reading", "Failed to extract bundled skill '")

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

See this entry in the whole of v2.1.76 →