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.
The internal metrics feature appears to be prepared for future use but is currently disabled (the uB6() function returns false). When enabled, this feature will provide Anthropic with anonymous usage metrics to help improve Claude Code.