(2026-10-10, found installing the plugin on a fresh machine)
The README's install line, claude plugin marketplace add https://tangled.org/permadeath.com/didbot-claude, fails with "Invalid marketplace schema from URL: : Invalid input": without a .git suffix, Claude Code fetches the URL as a marketplace JSON file and gets Tangled's HTML page. https://tangled.org/permadeath.com/didbot-claude.git clones and installs correctly. The same applies to vibescrobble.com's plugin.