Errors reached people as raw tool output: "Unsupported URL: https://...%D0%B0%D1%83..." says nothing to whoever pasted a link. The common cases now map to plain descriptions with the next step where there is one (age gate and bot checks point at YTDLP_COOKIES, a stale extractor at updating yt-dlp), URLs are decoded, and anything unrecognised still falls through verbatim. The panel's prefix hint is gone now that the source picker does the same job visibly; prefixes keep working and stay documented for chat. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>