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.
When a plugin dependency can't be resolved, the error message now includes a specific install command and marketplace information: not installed — run "claude plugin install <name>" instead of the previous generic "not found in any configured marketplace".
Evidence
Enhanced error message (search for "not installed — run")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.