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 v2.1.77 Home All releases olderv2.1.76 v2.1.78newer
Claude Code v2.1.77

Model Capabilities Caching

What

Model capability definitions are now cached locally in a model-capabilities.json file, reducing redundant fetches.

Details
  • Capabilities are written to disk and reused across sessions
  • Cache-change detection skips unnecessary writes: "[modelCapabilities] cache unchanged, skipping write"
  • Graceful fallback on fetch failure: "[modelCapabilities] fetch failed:"
Evidence

Cache file handling (search for "model-capabilities.json")

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

See this entry in the whole of v2.1.77 →