GET /sources lists the sources that are configured and whose API key works, each with its display name and the address templates of its movie and TV show pages. Every source has a health check that tests the key (TVDB asks for its languages, TMDB for its configuration) and describes the source; the results are remembered for five minutes if healthy and half a minute if not, so a fixed key shows up soon without asking the sources on every request. Nothing that could carry the key is logged. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>