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Generate motion graphic

generate_motion_graphic

Generate an animated motion graphic video from a text prompt. Best for precise text animations (typing effects, kinetic typography, lower thirds) that stock or generated footage can't express. Outputs a transparent WebM overlay by default; set transparentBackground to false for an opaque MP4. Optionally pass reference media file ids to display or animate. Typically takes 2–5 minutes because VideoGen writes animation code and then renders it; complex prompts can take longer. Tell the user that wait before starting and keep polling calmly — a healthy in-progress job is expected.

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": {
      "prompt": "<prompt>"
    },
    "name": "generate_motion_graphic"
  }
}

Input Schema

NameRequiredDescriptionDefault
promptYesDescription of the animated motion graphic.
fileIdsNoMedia to display or animate in the motion graphic. Use fileId values from upload_file, get_file, or list_files.
entityIdsNoActor, product, or visual-style references. Use entityId values from list_entities or create_entity, with reference files attached.
aspectRatioNoOutput aspect ratio as width:height units (not pixels). Example: { width: 16, height: 9 }.
subToolModesNoOptional per-capability controls for generated images, video clips, voiceover, and stock media. Omit to use AUTO for every capability.
durationSecondsNoRequested motion-graphic playback duration in seconds.
transparentBackgroundNoRender a transparent WebM for use as an overlay on other video or images. Defaults to true. Set to false for an opaque MP4.

Output Schema

NameRequiredDescriptionDefault
errorNoError details when status is failed; otherwise null.
statusNoJob status: pending, running, succeeded, failed, or cancelled.
resultsNoGenerated results with download URLs when succeeded.
toolTypeNoTool name (e.g. GENERATE_IMAGE).
attemptIndexNoCurrent or latest attempt index.
toolExecutionIdYesTool execution id (vg_tool_...).
progressPercentageNoCompletion progress 0-100 (present after polling).

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed33 schema fields changed
    • changedOutput schema / properties / error / anyOf
      Previous value: -[
      -  {
      -    "additionalProperties": {},
      -    "properties": {
      -      "code": {
      -        "anyOf": [
      -          {
      -            "type": "string"
      -          },
      -          {
      -            "type": "null"
      -          }
      -        ],
      -        "description": "Machine-readable error code."
      -      },
      -      "internalErrorCode": {
      -        "anyOf": [
      -          {
      -            "type": "string"
      -          },
      -          {
      -            "type": "null"
      -          }
      -        ],
      -        "description": "Opaque code for support."
      -      },
      -      "message": {
      -        "description": "Human-readable error description.",
      -        "type": "string"
      -      },
      -      "requirement": {
      -        "anyOf": [
      -          {
      -            "additionalProperties": {},
      -            "properties": {
      -              "details": {
      -                "additionalProperties": {
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      -                },
      -                "propertyNames": {
      -                  "type": "string"
      -                },
      -                "type": "object"
      -              },
      -              "type": {
      -                "description": "Requirement type (e.g. purchase_add_on).",
      -                "type": "string"
      -              }
      -            },
      -            "required": [
      -              "type"
      -            ],
      -            "type": "object"
      -          },
      -          {
      -            "type": "null"
      -          }
      -        ],
      -        "description": "What is needed to resolve the error, when applicable."
      -      }
      -    },
      -    "required": [
      -      "message"
      -    ],
      -    "type": "object"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]New value: +[
      +  {
      +    "additionalProperties": {},
      +    "properties": {
      +      "code": {
      +        "description": "Machine-readable error code.",
      +        "type": [
      +          "string",
      +          "null"
      +        ]
      +      },
      +      "internalErrorCode": {
      +        "description": "Opaque code for support.",
      +        "type": [
      +          "string",
      +          "null"
      +        ]
      +      },
      +      "message": {
      +        "description": "Human-readable error description.",
      +        "type": "string"
      +      },
      +      "requirement": {
      +        "anyOf": [
      +          {
      +            "additionalProperties": {},
      +            "properties": {
      +              "details": {
      +                "additionalProperties": {
      +                  "type": "string"
      +                },
      +                "propertyNames": {
      +                  "type": "string"
      +                },
      +                "type": "object"
      +              },
      +              "type": {
      +                "description": "Requirement type (e.g. purchase_add_on).",
      +                "type": "string"
      +              }
      +            },
      +            "required": [
      +              "type"
      +            ],
      +            "type": "object"
      +          },
      +          {
      +            "type": "null"
      +          }
      +        ],
      +        "description": "What is needed to resolve the error, when applicable."
      +      }
      +    },
      +    "required": [
      +      "message"
      +    ],
      +    "type": "object"
      +  },
      +  {
      +    "type": "null"
      +  }
      +]
    • removedOutput schema / properties / results / items / properties / downloadUrl / anyOf
      Removed value: -[
      -  {
      -    "type": "string"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]
    • addedOutput schema / properties / results / items / properties / downloadUrl / type
      Added value: +[
      +  "string",
      +  "null"
      +]
    • removedOutput schema / properties / results / items / properties / downloadUrlExpiresAt / anyOf
      Removed value: -[
      -  {
      -    "type": "number"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]
    • addedOutput schema / properties / results / items / properties / downloadUrlExpiresAt / type
      Added value: +[
      +  "number",
      +  "null"
      +]
    • removedOutput schema / properties / results / items / properties / file / properties / description / anyOf
      Removed value: -[
      -  {
      -    "type": "string"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]
    • addedOutput schema / properties / results / items / properties / file / properties / description / type
      Added value: +[
      +  "string",
      +  "null"
      +]
    • changedOutput schema / properties / results / items / properties / file / properties / downloadSource / anyOf
      Previous value: -[
      -  {
      -    "additionalProperties": {},
      -    "description": "A file rendition source (thumbnail, preview, download, …).",
      -    "properties": {
      -      "expiresAt": {
      -        "anyOf": [
      -          {
      -            "type": "number"
      -          },
      -          {
      -            "type": "null"
      -          }
      -        ],
      -        "description": "Unix expiry for url."
      -      },
      -      "fileBytes": {
      -        "anyOf": [
      -          {
      -            "type": "number"
      -          },
      -          {
      -            "type": "null"
      -          }
      -        ],
      -        "description": "Rendition size in bytes."
      -      },
      -      "height": {
      -        "anyOf": [
      -          {
      -            "type": "number"
      -          },
      -          {
      -            "type": "null"
      -          }
      -        ],
      -        "description": "Rendition height in pixels."
      -      },
      -      "status": {
      -        "description": "Rendition status.",
      -        "enum": [
      -          "pending",
      -          "ready",
      -          "failed",
      -          "skipped"
      -        ],
      -        "type": "string"
      -      },
      -      "url": {
      -        "anyOf": [
      -          {
      -            "type": "string"
      -          },
      -          {
      -            "type": "null"
      -          }
      -        ],
      -        "description": "Signed URL when status is ready."
      -      },
      -      "width": {
      -        "anyOf": [
      -          {
      -            "type": "number"
      -          },
      -          {
      -            "type": "null"
      -          }
      -        ],
      -        "description": "Rendition width in pixels."
      -      }
      -    },
      -    "required": [
      -      "status"
      -    ],
      -    "type": "object"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]New value: +[
      +  {
      +    "additionalProperties": {},
      +    "description": "A file rendition source (thumbnail, preview, download, …).",
      +    "properties": {
      +      "expiresAt": {
      +        "description": "Unix expiry for url.",
      +        "type": [
      +          "number",
      +          "null"
      +        ]
      +      },
      +      "fileBytes": {
      +        "description": "Rendition size in bytes.",
      +        "type": [
      +          "number",
      +          "null"
      +        ]
      +      },
      +      "height": {
      +        "description": "Rendition height in pixels.",
      +        "type": [
      +          "number",
      +          "null"
      +        ]
      +      },
      +      "status": {
      +        "description": "Rendition status.",
      +        "enum": [
      +          "pending",
      +          "ready",
      +          "failed",
      +          "skipped"
      +        ],
      +        "type": "string"
      +      },
      +      "url": {
      +        "description": "Signed URL when status is ready.",
      +        "type": [
      +          "string",
      +          "null"
      +        ]
      +      },
      +      "width": {
      +        "description": "Rendition width in pixels.",
      +        "type": [
      +          "number",
      +          "null"
      +        ]
      +      }
      +    },
      +    "required": [
      +      "status"
      +    ],
      +    "type": "object"
      +  },
      +  {
      +    "type": "null"
      +  }
      +]
    • removedOutput schema / properties / results / items / properties / file / properties / downloadUrl / anyOf
      Removed value: -[
      -  {
      -    "type": "string"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]
    • addedOutput schema / properties / results / items / properties / file / properties / downloadUrl / type
      Added value: +[
      +  "string",
      +  "null"
      +]
    • removedOutput schema / properties / results / items / properties / file / properties / downloadUrlExpiresAt / anyOf
      Removed value: -[
      -  {
      -    "type": "number"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]
    • addedOutput schema / properties / results / items / properties / file / properties / downloadUrlExpiresAt / type
      Added value: +[
      +  "number",
      +  "null"
      +]
    • removedOutput schema / properties / results / items / properties / file / properties / durationSeconds / anyOf
      Removed value: -[
      -  {
      -    "type": "number"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]
    • addedOutput schema / properties / results / items / properties / file / properties / durationSeconds / type
      Added value: +[
      +  "number",
      +  "null"
      +]
    • changedOutput schema / properties / results / items / properties / file / properties / hlsSource / anyOf
      Previous value: -[
      -  {
      -    "additionalProperties": {},
      -    "description": "A file rendition source (thumbnail, preview, download, …).",
      -    "properties": {
      -      "expiresAt": {
      -        "anyOf": [
      -          {
      -            "type": "number"
      -          },
      -          {
      -            "type": "null"
      -          }
      -        ],
      -        "description": "Unix expiry for url."
      -      },
      -      "fileBytes": {
      -        "anyOf": [
      -          {
      -            "type": "number"
      -          },
      -          {
      -            "type": "null"
      -          }
      -        ],
      -        "description": "Rendition size in bytes."
      -      },
      -      "height": {
      -        "anyOf": [
      -          {
      -            "type": "number"
      -          },
      -          {
      -            "type": "null"
      -          }
      -        ],
      -        "description": "Rendition height in pixels."
      -      },
      -      "status": {
      -        "description": "Rendition status.",
      -        "enum": [
      -          "pending",
      -          "ready",
      -          "failed",
      -          "skipped"
      -        ],
      -        "type": "string"
      -      },
      -      "url": {
      -        "anyOf": [
      -          {
      -            "type": "string"
      -          },
      -          {
      -            "type": "null"
      -          }
      -        ],
      -        "description": "Signed URL when status is ready."
      -      },
      -      "width": {
      -        "anyOf": [
      -          {
      -            "type": "number"
      -          },
      -          {
      -            "type": "null"
      -          }
      -        ],
      -        "description": "Rendition width in pixels."
      -      }
      -    },
      -    "required": [
      -      "status"
      -    ],
      -    "type": "object"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]New value: +[
      +  {
      +    "additionalProperties": {},
      +    "description": "A file rendition source (thumbnail, preview, download, …).",
      +    "properties": {
      +      "expiresAt": {
      +        "description": "Unix expiry for url.",
      +        "type": [
      +          "number",
      +          "null"
      +        ]
      +      },
      +      "fileBytes": {
      +        "description": "Rendition size in bytes.",
      +        "type": [
      +          "number",
      +          "null"
      +        ]
      +      },
      +      "height": {
      +        "description": "Rendition height in pixels.",
      +        "type": [
      +          "number",
      +          "null"
      +        ]
      +      },
      +      "status": {
      +        "description": "Rendition status.",
      +        "enum": [
      +          "pending",
      +          "ready",
      +          "failed",
      +          "skipped"
      +        ],
      +        "type": "string"
      +      },
      +      "url": {
      +        "description": "Signed URL when status is ready.",
      +        "type": [
      +          "string",
      +          "null"
      +        ]
      +      },
      +      "width": {
      +        "description": "Rendition width in pixels.",
      +        "type": [
      +          "number",
      +          "null"
      +        ]
      +      }
      +    },
      +    "required": [
      +      "status"
      +    ],
      +    "type": "object"
      +  },
      +  {
      +    "type": "null"
      +  }
      +]
    • changedOutput schema / properties / results / items / properties / file / properties / previewSource / anyOf
      Previous value: -[
      -  {
      -    "additionalProperties": {},
      -    "description": "A file rendition source (thumbnail, preview, download, …).",
      -    "properties": {
      -      "expiresAt": {
      -        "anyOf": [
      -          {
      -            "type": "number"
      -          },
      -          {
      -            "type": "null"
      -          }
      -        ],
      -        "description": "Unix expiry for url."
      -      },
      -      "fileBytes": {
      -        "anyOf": [
      -          {
      -            "type": "number"
      -          },
      -          {
      -            "type": "null"
      -          }
      -        ],
      -        "description": "Rendition size in bytes."
      -      },
      -      "height": {
      -        "anyOf": [
      -          {
      -            "type": "number"
      -          },
      -          {
      -            "type": "null"
      -          }
      -        ],
      -        "description": "Rendition height in pixels."
      -      },
      -      "status": {
      -        "description": "Rendition status.",
      -        "enum": [
      -          "pending",
      -          "ready",
      -          "failed",
      -          "skipped"
      -        ],
      -        "type": "string"
      -      },
      -      "url": {
      -        "anyOf": [
      -          {
      -            "type": "string"
      -          },
      -          {
      -            "type": "null"
      -          }
      -        ],
      -        "description": "Signed URL when status is ready."
      -      },
      -      "width": {
      -        "anyOf": [
      -          {
      -            "type": "number"
      -          },
      -          {
      -            "type": "null"
      -          }
      -        ],
      -        "description": "Rendition width in pixels."
      -      }
      -    },
      -    "required": [
      -      "status"
      -    ],
      -    "type": "object"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]New value: +[
      +  {
      +    "additionalProperties": {},
      +    "description": "A file rendition source (thumbnail, preview, download, …).",
      +    "properties": {
      +      "expiresAt": {
      +        "description": "Unix expiry for url.",
      +        "type": [
      +          "number",
      +          "null"
      +        ]
      +      },
      +      "fileBytes": {
      +        "description": "Rendition size in bytes.",
      +        "type": [
      +          "number",
      +          "null"
      +        ]
      +      },
      +      "height": {
      +        "description": "Rendition height in pixels.",
      +        "type": [
      +          "number",
      +          "null"
      +        ]
      +      },
      +      "status": {
      +        "description": "Rendition status.",
      +        "enum": [
      +          "pending",
      +          "ready",
      +          "failed",
      +          "skipped"
      +        ],
      +        "type": "string"
      +      },
      +      "url": {
      +        "description": "Signed URL when status is ready.",
      +        "type": [
      +          "string",
      +          "null"
      +        ]
      +      },
      +      "width": {
      +        "description": "Rendition width in pixels.",
      +        "type": [
      +          "number",
      +          "null"
      +        ]
      +      }
      +    },
      +    "required": [
      +      "status"
      +    ],
      +    "type": "object"
      +  },
      +  {
      +    "type": "null"
      +  }
      +]
    • removedOutput schema / properties / results / items / properties / file / properties / publicHlsUrl / anyOf
      Removed value: -[
      -  {
      -    "type": "string"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]
    • addedOutput schema / properties / results / items / properties / file / properties / publicHlsUrl / type
      Added value: +[
      +  "string",
      +  "null"
      +]
    • removedOutput schema / properties / results / items / properties / file / properties / publicPlaybackId / anyOf
      Removed value: -[
      -  {
      -    "type": "string"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]
    • addedOutput schema / properties / results / items / properties / file / properties / publicPlaybackId / type
      Added value: +[
      +  "string",
      +  "null"
      +]
    • changedOutput schema / properties / results / items / properties / file / properties / thumbnailSource / anyOf
      Previous value: -[
      -  {
      -    "additionalProperties": {},
      -    "description": "A file rendition source (thumbnail, preview, download, …).",
      -    "properties": {
      -      "expiresAt": {
      -        "anyOf": [
      -          {
      -            "type": "number"
      -          },
      -          {
      -            "type": "null"
      -          }
      -        ],
      -        "description": "Unix expiry for url."
      -      },
      -      "fileBytes": {
      -        "anyOf": [
      -          {
      -            "type": "number"
      -          },
      -          {
      -            "type": "null"
      -          }
      -        ],
      -        "description": "Rendition size in bytes."
      -      },
      -      "height": {
      -        "anyOf": [
      -          {
      -            "type": "number"
      -          },
      -          {
      -            "type": "null"
      -          }
      -        ],
      -        "description": "Rendition height in pixels."
      -      },
      -      "status": {
      -        "description": "Rendition status.",
      -        "enum": [
      -          "pending",
      -          "ready",
      -          "failed",
      -          "skipped"
      -        ],
      -        "type": "string"
      -      },
      -      "url": {
      -        "anyOf": [
      -          {
      -            "type": "string"
      -          },
      -          {
      -            "type": "null"
      -          }
      -        ],
      -        "description": "Signed URL when status is ready."
      -      },
      -      "width": {
      -        "anyOf": [
      -          {
      -            "type": "number"
      -          },
      -          {
      -            "type": "null"
      -          }
      -        ],
      -        "description": "Rendition width in pixels."
      -      }
      -    },
      -    "required": [
      -      "status"
      -    ],
      -    "type": "object"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]New value: +[
      +  {
      +    "additionalProperties": {},
      +    "description": "A file rendition source (thumbnail, preview, download, …).",
      +    "properties": {
      +      "expiresAt": {
      +        "description": "Unix expiry for url.",
      +        "type": [
      +          "number",
      +          "null"
      +        ]
      +      },
      +      "fileBytes": {
      +        "description": "Rendition size in bytes.",
      +        "type": [
      +          "number",
      +          "null"
      +        ]
      +      },
      +      "height": {
      +        "description": "Rendition height in pixels.",
      +        "type": [
      +          "number",
      +          "null"
      +        ]
      +      },
      +      "status": {
      +        "description": "Rendition status.",
      +        "enum": [
      +          "pending",
      +          "ready",
      +          "failed",
      +          "skipped"
      +        ],
      +        "type": "string"
      +      },
      +      "url": {
      +        "description": "Signed URL when status is ready.",
      +        "type": [
      +          "string",
      +          "null"
      +        ]
      +      },
      +      "width": {
      +        "description": "Rendition width in pixels.",
      +        "type": [
      +          "number",
      +          "null"
      +        ]
      +      }
      +    },
      +    "required": [
      +      "status"
      +    ],
      +    "type": "object"
      +  },
      +  {
      +    "type": "null"
      +  }
      +]
    • removedOutput schema / properties / results / items / properties / file / properties / thumbnailUrl / anyOf
      Removed value: -[
      -  {
      -    "type": "string"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]
    • addedOutput schema / properties / results / items / properties / file / properties / thumbnailUrl / type
      Added value: +[
      +  "string",
      +  "null"
      +]
    • removedOutput schema / properties / results / items / properties / file / properties / thumbnailUrlExpiresAt / anyOf
      Removed value: -[
      -  {
      -    "type": "number"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]
    • addedOutput schema / properties / results / items / properties / file / properties / thumbnailUrlExpiresAt / type
      Added value: +[
      +  "number",
      +  "null"
      +]
    • removedOutput schema / properties / results / items / properties / file / properties / transcriptText / anyOf
      Removed value: -[
      -  {
      -    "type": "string"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]
    • addedOutput schema / properties / results / items / properties / file / properties / transcriptText / type
      Added value: +[
      +  "string",
      +  "null"
      +]
    • removedOutput schema / properties / results / items / properties / file / properties / type / anyOf
      Removed value: -[
      -  {
      -    "type": "string"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]
    • addedOutput schema / properties / results / items / properties / file / properties / type / type
      Added value: +[
      +  "string",
      +  "null"
      +]
    • removedOutput schema / properties / results / items / properties / thumbnailUrl / anyOf
      Removed value: -[
      -  {
      -    "type": "string"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]
    • addedOutput schema / properties / results / items / properties / thumbnailUrl / type
      Added value: +[
      +  "string",
      +  "null"
      +]
    • removedOutput schema / properties / results / items / properties / thumbnailUrlExpiresAt / anyOf
      Removed value: -[
      -  {
      -    "type": "number"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]
    • addedOutput schema / properties / results / items / properties / thumbnailUrlExpiresAt / type
      Added value: +[
      +  "number",
      +  "null"
      +]
  2. Changed7 schema fields changed
    • addedInput schema / properties / durationSeconds / description
      Added value: +"Requested motion-graphic playback duration in seconds."
    • changedInput schema / properties / entityIds / description
      Previous value: -"Optional actor, product, or visual-style entity ids (vg_enti_...)."New value: +"Actor, product, or visual-style references. Use entityId values from list_entities or create_entity, with reference files attached."
    • changedInput schema / properties / fileIds / description
      Previous value: -"Optional reference media file ids."New value: +"Media to display or animate in the motion graphic. Use fileId values from upload_file, get_file, or list_files."
    • changedInput schema / properties / subToolModes / properties / generateImages / description
      Previous value: -"AUTO uses the capability when the plan allows it. ENABLED requires it. DISABLED turns it off."New value: +"Control image generation within the motion graphic: AUTO lets the plan decide, ENABLED requires use, and DISABLED prevents use."
    • changedInput schema / properties / subToolModes / properties / generateVideoClips / description
      Previous value: -"AUTO uses the capability when the plan allows it. ENABLED requires it. DISABLED turns it off."New value: +"Control video-clip generation within the motion graphic: AUTO lets the plan decide, ENABLED requires use, and DISABLED prevents use."
    • changedInput schema / properties / subToolModes / properties / generateVoiceover / description
      Previous value: -"AUTO uses the capability when the plan allows it. ENABLED requires it. DISABLED turns it off."New value: +"Control voiceover synthesis within the motion graphic: AUTO lets the plan decide, ENABLED requires use, and DISABLED prevents use."
    • changedInput schema / properties / subToolModes / properties / searchStockMedia / description
      Previous value: -"AUTO uses the capability when the plan allows it. ENABLED requires it. DISABLED turns it off."New value: +"Control stock-media search within the motion graphic: AUTO lets the plan decide, ENABLED requires use, and DISABLED prevents use."
  3. First observed

TDQS

A4.4/5.0
Behavior5/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations only say this is a non-read-only, non-destructive, non-idempotent mutation. The description goes well beyond them: default output is a transparent WebM, transparentBackground=false yields opaque MP4, reference media can be displayed or animated, and the job takes 2–5 minutes because animation code is written then rendered. The explicit instruction that a long-running in-progress job is healthy is exactly the kind of context an agent needs to avoid retrying or cancelling prematurely.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Front-loaded with purpose and differentiator in the first two sentences, then output format, latency, and polling guidance in descending order of importance. Every sentence carries information, though 'keep polling calmly' and the re-explanation of the transparent default are slightly conversational relative to the schema's own wording.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a 7-parameter asynchronous generation tool with an output schema, the description covers what an agent cannot infer: expected latency, why it is slow, the output container/tranparency default, and the async polling posture. Return values are handled by the output schema, so nothing material is missing.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so every parameter including the nested subToolModes enums and aspectRatio units is already documented. The description adds only light framing — reference media 'to display or animate' and the transparent-vs-opaque output tradeoff — which largely restates what the schema says. Baseline 3 applies when the schema carries the burden.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb and resource (generate an animated motion graphic video from a text prompt) and then narrows the niche: precise text animations like typing effects, kinetic typography, lower thirds. That contrast against 'stock or generated footage' tells an agent how this differs from generate_video_clip or prompt_to_video_clip without opening their schemas.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Gives a clear selection rule (use this when footage can't express the concept) and operational guidance for the wait-and-poll cycle after the call. It does not name the specific sibling tools an agent should pick instead when footage is the right answer, so the routing is by use-case description rather than explicit alternatives.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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