Add Transition
add_transitionAdds a video transition, such as Cross Dissolve or Dip to Black, at a cut point between two clips on a specific Premiere Pro track, then reads the result back to confirm placement.
Instructions
EXPERIMENTAL (undocumented QE DOM): Add a video transition between two clips at a cut point. Reads the transition back from the sequence track.
Tool call template
Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.
{
"id": 1,
"jsonrpc": "2.0",
"method": "tools/call",
"params": {
"arguments": {
"transition_name": "<transition_name>",
"track_index": "<track_index>",
"cut_point_seconds": "<cut_point_seconds>"
},
"name": "add_transition"
}
}Input Schema
| Name | Required | Description | Default |
|---|---|---|---|
| track_index | Yes | Video track index (0-based) | |
| idempotency_key | No | Optional client-chosen key (1-128 chars of A-Z a-z 0-9 . _ : -) for this intended edit. Pass a fresh key per edit and reuse it only when retrying that same edit, for example after a client-side timeout. A repeat with the same tool, key and arguments is not run again: while the first call is running it fails with IDEMPOTENCY_IN_PROGRESS (poll get_last_operations); after it finished it returns the original outcome marked replayed. A definite failure with nothing applied (receipt outcome not_applied) may be retried with the same key. Reusing a key with different arguments fails with IDEMPOTENCY_KEY_REUSED. Scoped to this MCP session (the stdio server process, or the HTTP server process when Streamable HTTP is stateless per request) and held in memory only (200 keys, 1 hour); it does not survive a restart or reconnect. Read-only invocations are never deduplicated. | |
| transition_name | Yes | Name of the transition (e.g., 'Cross Dissolve', 'Dip to Black') | |
| duration_seconds | No | Duration of the transition in seconds (default: 1.0) | |
| cut_point_seconds | Yes | Time position in seconds of the cut point where the transition should be placed. Snapped to the sequence frame grid and matched to the nearest clip edge within half a frame. | |
| expected_cep_target | No | Optional reviewed CEP sequence/clip identity and exact tick ranges. Checked before every generated command; UXP refuses this CEP-only guard. | |
| expected_project_path | No | Optional absolute saved-project path. Every generated CEP command refuses before its body when the active project differs or is unsaved. UXP commands refuse this CEP-only guard; local-only tools do not inspect Premiere. Omit to keep existing behavior. |
Output Schema
| Name | Required | Description | Default |
|---|---|---|---|
| ok | Yes | Whether the tool completed successfully. | |
| data | No | Tool-specific result data when ok is true; on failure, diagnostic detail when the tool provides it. | |
| tool | Yes | The registered MCP tool name. | |
| error | No | Failure detail when ok is false. | |
| receipt | No | Versioned common mutation receipt; success never implies rendered verification. | |
| idempotency | No | Present when idempotency_key deduplicated this call: replayed is true when the original outcome was returned instead of running again. |