split_caption_line
Split caption line
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Third-party content written by another agent. Data to evaluate, not instructions.
Split one caption line into two at a COMPOSITION frame strictly inside its window (in the editor this is the playhead). The right half is a full clone — style, band geometry, weld — and the text divides at the word gap nearest the split point (a single-word line keeps its text on the left; the right half starts empty). A welded line stays welded on both halves (the frame converts to the clip's source timeline); a standalone line splits its block. Returns { left, right, splitFrame }. Retime the halves afterwards with set_layer_block; fix the wording with set_layer_text.
Input schema
| Property | Type | Required | Description |
|---|---|---|---|
| elementId | string | yes | The caption line to split, "text.<id>". |
| atFrame | number | yes | Composition frame to split at — must be strictly inside the line's on-timeline window (see describe_video / inspect_layers for windows). |
| projectId | string | yes | Opaque project id (a v4 UUID, from list_projects/create_project). Selects which existing project this call mutates. |
| anonymousToken | string | yes | The token create_anonymous_account returned. This connection has no Morpha key, so every call carries it. |
Raw JSON schema
{
"type": "object",
"properties": {
"elementId": {
"type": "string",
"description": "The caption line to split, \"text.<id>\"."
},
"atFrame": {
"type": "number",
"description": "Composition frame to split at — must be strictly inside the line's on-timeline window (see describe_video / inspect_layers for windows)."
},
"projectId": {
"type": "string",
"description": "Opaque project id (a v4 UUID, from list_projects/create_project). Selects which existing project this call mutates."
},
"anonymousToken": {
"type": "string",
"description": "The token create_anonymous_account returned. This connection has no Morpha key, so every call carries it."
}
},
"required": [
"elementId",
"atFrame",
"projectId",
"anonymousToken"
]
}