Write and check SkillPact contracts (skill.contract.json) for Agent Skills with the skillpact CLI - draft a contract from a SKILL.md, validate it, run its conformance tests network-isolated, hash and sign every file, report the level L1 / L2 / L3, match it against a harness policy (allow / ask / deny) and compile that decision to Claude Code, Cursor, Codex or Gemini CLI settings or export it to HushSpec, Rego, APS or ACS. Use when the user wants a skill's permissions declared or reviewed before install, a contract drafted, validated, signed or migrated, a conformance level or badge, a policy check, or harness permission settings made from a policy. Python 3.11+; bubblewrap on Linux for L2 and L3. Not a runtime sandbox and not a malware scanner - L3 means these files, signed by a trusted author, passed their tests, not that the skill is safe.
Edit video and audio with local FFmpeg from natural-language requests: cut, trim, join, resize/reframe (9:16, 1:1), speed change, captions and subtitles (SRT/ASS, animated, karaoke), logos and text overlays, lower-thirds and titles, silence removal, multicam and external-mic sync, loudness normalisation, HDR/Dolby Vision to SDR, LUTs, background music with ducking, platform exports (YouTube, Reels, TikTok, X), compliance checks, scene detection and highlight reels, contact sheets to inspect results, and whole-edit project files. Use this skill whenever the user mentions a video or audio file (mp4, mov, mkv, wav, m4a), footage, a clip, captions, subtitles, a reel or short, YouTube/Instagram/TikTok delivery, LUFS, sync, transcoding, ffmpeg, or asks to make something "60 seconds", "vertical", "louder", "captioned" — even when they do not say "edit". Python 3.9 standard library only, no cloud, no API keys.
