Cut Agent Skill

Cut Agent workflow

1. Call cut_get_project before modifying an existing project. It returns only a compact overview, resource counts, the current internal edit revision, and availableReads; retain that revision as an optimistic-concurrency token, not as a user-visible saved version.
2. Disclose details progressively. Use cut_list_tracks for structure, cut_list_clips for bounded filtered pages, cut_get_clip for one exact clip, cut_list_media_assets/cut_get_media_asset for safe media metadata, and cut_list_project_resources for one paged collection of jobs, versions, exports, caption drafts, proposals, or logs. Pass expectedRevision from cut_get_project and refresh the overview on conflict.
3. Never request, reconstruct, or replace the complete project IR through Agent tools. Use narrow mutations or cut_apply_batch; the full document is reserved for the Workbench host path.
4. Import media with cut_import_media; pass a runtime workspace path or portable file reference, never base64.
5. For a simple explicit edit, use the narrow atomic tool and include baseRevision plus a concise changeSummary.
6. For a complex, destructive, or goal-level rough cut, search exact evidence with cut_search_media_segments, inspect it with cut_get_media_segment, and create cut_create_edit_proposal. Every proposal item must cite evidence.
7. Let the user review the proposal diff, risk, evidence, and preview in Workbench. Use cut_update_edit_proposal only for explicit item decisions, and cut_apply_edit_proposal only after approval with exact project and proposal revisions.
8. Never silently apply, rebase, or recreate a stale/rejected proposal. Use cut_revert_edit_proposal only after an explicit undo request and only at the exact applied project revision. Never bypass proposal review with a whole-document replacement.
9. Use cut_update_project_settings for project width, height, fps, or background. Keep its default preserve policy unless the user explicitly asks to reframe the composition with contain, cover, or stretch.
10. Read source orientation only from media codedWidth, codedHeight, displayWidth, displayHeight, and rotationDegrees. A clip transform.rotation is an intentional composition edit, not source metadata; never clear or invert it merely because the project dimensions changed.
11. On an internal edit-revision conflict, reload; never overwrite a dirty Workbench copy. Repeated saves of unchanged document data do not advance the edit revision, and non-timeline operations such as transcription, task polling, and caption-draft editing do not create project versions.
12. Create an immutable milestone only when the user explicitly requests one with cut_finalize_version; ordinary edits never create version snapshots automatically.
13. For smart speech cleanup, transcribe the source and run visible Workbench media analysis first. Call cut_create_speech_cleanup_proposal with an explicit mode (conservative, balanced, or aggressive) and only the requested categories: long pauses, filler words, repeated phrases, word-level stutters, or exact manualSegmentIds selected from the transcript. The tool maps source evidence to the current timeline and proposes end-to-start ripple_delete_ranges so picture and sound stay synchronized. Show the typed speech_cleanup proposal, category counts, estimated removed duration, evidence, and preview; apply it only after approval. Retain the exact applied ranges.
14. When calling cut_start_transcription, choose mode: platform only when the current Xpert Speech-to-Text provider is configured and the media can use that provider. Choose mode: sandbox_whisper for a durable offline background job that reads the Workspace Reference in Sandbox Browser with the bundled multilingual Q4 Whisper Tiny model. Use language: zh when Chinese is known, language: en when English is known, or language: und for automatic detection. Browser-local Whisper remains a user-triggered Workbench action and is not a backend tool mode. Poll cut_get_analysis_job and do not create captions until transcription succeeds.
15. Add a title cover with cut_add_cover only after speech cleanup. It inserts full-canvas color/title tracks, shifts the program later, and increases project duration. Retain its duration as the caption timeline offset.
16. After cleanup and cover insertion, create captions with cut_create_caption_draft, passing the exact applied cleanup ranges as timelineCuts and the cover duration as timelineOffsetSeconds. This retimes transcript cues to the final program timeline.
17. To translate captions, read the complete source draft, translate every cue without changing meaning or timing, and call cut_create_translated_caption_draft with one entry for every source captionId. A caption draft's sourceRevision is provenance and does not make it stale after unrelated project edits. For simultaneous bilingual or multilingual burned-in tracks, call cut_commit_caption_drafts once with 1–4 approved drafts so all tracks are written atomically.
18. Use the Workbench browser export for an immediate one-off render and whenever referenced media exceeds the Sandbox Job input limit of 350 MiB. The Workbench disables Headless MP4 and explains this fallback before submission. For durable, background, multi-size, templated, or localized-media output whose referenced media stays within that limit, call cut_start_headless_export at the exact current baseRevision. Submit at most five variants; template values replace {{variable}} in text clips, and mediaAssetMap explicitly maps a source asset UUID to another compatible imported project asset UUID. Every media clip must refer to an imported mediaAssetId.
19. Poll each returned job with cut_get_analysis_job. Do not claim the MP4 is saved until status is succeeded and resultExportId is present. Use cut_cancel_analysis_job for explicit cancellation; retry failures by their machine-readable failureCode rather than changing the project snapshot.
20. Record import, validation, media-load, save, or export failures with cut_report_failure.

The project document is versioned schema 1. Time values are seconds. Clips may not extend beyond the project duration. split.at is absolute project time; trim and move times are also absolute project time.