VideoGen

Export project

export_project

Use when the user wants to download or deliver a finished VideoGen video as an MP4. Export the existing editable project; this does not publish to social media or an ad account. Wait for pending generation or remix work before exporting. Returns exportId on hosted clients; poll get_project_export with the same projectId for status, progress, errors, and downloadUrl when ready. Local calls wait for an export snapshot. Exports often take a few minutes; explain that wait before starting.

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": {
      "projectId": "<projectId>"
    },
    "name": "export_project"
  }
}

Input Schema

Name	Required	Description	Default
`quality`	No	MP4 resolution tier by shortest edge: STANDARD is 720p, HIGH and FULL_HIGH are 1080p, and ULTRA_HIGH is 2160p. Omit for FULL_HIGH.
`projectId`	Yes	Editable project to render. Use projectId from a workflow result, list_projects, or get_project.

Output Schema

Name	Required	Description
`file`	No	Hydrated export file metadata.
`error`	No	Error details when status is failed; otherwise null.
`status`	No	Job status: pending, running, succeeded, failed, or cancelled.
`exportId`	Yes	Export id (vg_expo_...).
`projectId`	No	Exported project id (present after polling).
`downloadUrl`	No	Signed MP4 download URL when succeeded; otherwise null.
`attemptIndex`	No	Current or latest attempt index.
`exportFileId`	No	Exported MP4 file id when succeeded.
`thumbnailUrl`	No	Signed thumbnail URL when ready.
`progressPercentage`	No	Completion progress 0-100 (present after polling).
`downloadUrlExpiresAt`	No	Unix expiry for downloadUrl.
`thumbnailUrlExpiresAt`	No	Unix expiry for thumbnailUrl.

Schema Changelog

Changes observed during successful MCP inspections.

Changed12 schema fields changedNov 4, 2026

removedOutput schema / properties / downloadUrl / anyOf

Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]

addedOutput schema / properties / downloadUrl / type
```
Added value: +[
+  "string",
+  "null"
+]
```

removedOutput schema / properties / downloadUrlExpiresAt / anyOf

Removed value: -[
-  {
-    "type": "number"
-  },
-  {
-    "type": "null"
-  }
-]

addedOutput schema / properties / downloadUrlExpiresAt / type
```
Added value: +[
+  "number",
+  "null"
+]
```

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": {
-                  "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"
-  }
-]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 / exportFileId / anyOf

Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]

addedOutput schema / properties / exportFileId / type
```
Added value: +[
+  "string",
+  "null"
+]
```

changedOutput schema / properties / file / anyOf

Previous value: -[
-  {
-    "additionalProperties": {},
-    "description": "File metadata with signed URLs when hydrated.",
-    "properties": {
-      "description": {
-        "anyOf": [
-          {
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "description": "File description when analyzed."
-      },
-      "displayName": {
-        "description": "Display name for the file.",
-        "type": "string"
-      },
-      "downloadSource": {
-        "anyOf": [
-          {
-            "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"
-          }
-        ]
-      },
-      "downloadUrl": {
-        "anyOf": [
-          {
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "description": "Signed download URL when ready."
-      },
-      "downloadUrlExpiresAt": {
-        "anyOf": [
-          {
-            "type": "number"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "description": "Unix expiry for downloadUrl."
-      },
-      "durationSeconds": {
-        "anyOf": [
-          {
-            "type": "number"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "description": "Duration in seconds for video/audio; null for images."
-      },
-      "fileId": {
-        "description": "File id (vg_file_...).",
-        "type": "string"
-      },
-      "hlsSource": {
-        "anyOf": [
-          {
-            "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"
-          }
-        ]
-      },
-      "isPublicPreviewEnabled": {
-        "type": "boolean"
-      },
-      "previewSource": {
-        "anyOf": [
-          {
-            "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"
-          }
-        ]
-      },
-      "publicHlsUrl": {
-        "anyOf": [
-          {
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "publicPlaybackId": {
-        "anyOf": [
-          {
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "scope": {
-        "description": "File scope.",
-        "enum": [
-          "GLOBAL",
-          "PROJECT",
-          "EXPORT",
-          "TEMPORARY",
-          "ENTITY"
-        ],
-        "type": "string"
-      },
-      "sourceToolExecutionId": {
-        "type": "string"
-      },
-      "sourceToolType": {
-        "type": "string"
-      },
-      "thumbnailSource": {
-        "anyOf": [
-          {
-            "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"
-          }
-        ]
-      },
-      "thumbnailUrl": {
-        "anyOf": [
-          {
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "description": "Signed thumbnail URL when available."
-      },
-      "thumbnailUrlExpiresAt": {
-        "anyOf": [
-          {
-            "type": "number"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "description": "Unix expiry for thumbnailUrl."
-      },
-      "transcriptText": {
-        "anyOf": [
-          {
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "description": "Plain transcript text when available."
-      },
-      "type": {
-        "anyOf": [
-          {
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "description": "File type once processing has determined it."
-      }
-    },
-    "required": [
-      "fileId"
-    ],
-    "type": "object"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "additionalProperties": {},
+    "description": "File metadata with signed URLs when hydrated.",
+    "properties": {
+      "description": {
+        "description": "File description when analyzed.",
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "displayName": {
+        "description": "Display name for the file.",
+        "type": "string"
+      },
+      "downloadSource": {
+        "anyOf": [
+          {
+            "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"
+          }
+        ]
+      },
+      "downloadUrl": {
+        "description": "Signed download URL when ready.",
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "downloadUrlExpiresAt": {
+        "description": "Unix expiry for downloadUrl.",
+        "type": [
+          "number",
+          "null"
+        ]
+      },
+      "durationSeconds": {
+        "description": "Duration in seconds for video/audio; null for images.",
+        "type": [
+          "number",
+          "null"
+        ]
+      },
+      "fileId": {
+        "description": "File id (vg_file_...).",
+        "type": "string"
+      },
+      "hlsSource": {
+        "anyOf": [
+          {
+            "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"
+          }
+        ]
+      },
+      "isPublicPreviewEnabled": {
+        "type": "boolean"
+      },
+      "previewSource": {
+        "anyOf": [
+          {
+            "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"
+          }
+        ]
+      },
+      "publicHlsUrl": {
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "publicPlaybackId": {
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "scope": {
+        "description": "File scope.",
+        "enum": [
+          "GLOBAL",
+          "PROJECT",
+          "EXPORT",
+          "TEMPORARY",
+          "ENTITY"
+        ],
+        "type": "string"
+      },
+      "sourceToolExecutionId": {
+        "type": "string"
+      },
+      "sourceToolType": {
+        "type": "string"
+      },
+      "thumbnailSource": {
+        "anyOf": [
+          {
+            "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"
+          }
+        ]
+      },
+      "thumbnailUrl": {
+        "description": "Signed thumbnail URL when available.",
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "thumbnailUrlExpiresAt": {
+        "description": "Unix expiry for thumbnailUrl.",
+        "type": [
+          "number",
+          "null"
+        ]
+      },
+      "transcriptText": {
+        "description": "Plain transcript text when available.",
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "type": {
+        "description": "File type once processing has determined it.",
+        "type": [
+          "string",
+          "null"
+        ]
+      }
+    },
+    "required": [
+      "fileId"
+    ],
+    "type": "object"
+  },
+  {
+    "type": "null"
+  }
+]

removedOutput schema / properties / thumbnailUrl / anyOf

Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]

addedOutput schema / properties / thumbnailUrl / type
```
Added value: +[
+  "string",
+  "null"
+]
```

removedOutput schema / properties / thumbnailUrlExpiresAt / anyOf

Removed value: -[
-  {
-    "type": "number"
-  },
-  {
-    "type": "null"
-  }
-]

addedOutput schema / properties / thumbnailUrlExpiresAt / type
```
Added value: +[
+  "number",
+  "null"
+]
```

Changed2 schema fields changedOct 16, 2026

changedInput schema / properties / projectId / description

Previous value: -"Project id to export."New value: +"Editable project to render. Use projectId from a workflow result, list_projects, or get_project."

changedInput schema / properties / quality / description

Previous value: -"Export quality. Omit for the default."New value: +"MP4 resolution tier by shortest edge: STANDARD is 720p, HIGH and FULL_HIGH are 1080p, and ULTRA_HIGH is 2160p. Omit for FULL_HIGH."

First observedOct 9, 2026

TDQS

A4.7/5.0

Behavior5/5

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

Annotations only declare it as a non-read-only, non-idempotent, non-destructive operation; the description adds real behavior: hosted calls return exportId while local calls block for a snapshot, and exports take minutes. It also tells the agent to set expectations with the user about the wait, which no structured field conveys.

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

Conciseness5/5

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

Six short sentences, each carrying distinct information: trigger, exclusion, prerequisite, return behavior, polling instruction, and timing expectation. The usage trigger is front-loaded before the operational detail, with no filler or repetition.

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?

Even though an output schema exists, the description still covers the async lifecycle (exportId, polling target, downloadUrl availability), the local synchronous variant, and the expected duration. For a long-running export tool, that is everything an agent needs to invoke it and set user expectations correctly.

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 coverage is 100%, including a fully documented quality enum with resolution tiers, so the baseline is 3. The description only adds that the same projectId is reused when polling get_project_export and implies it must reference an existing editable project; it says nothing about quality selection beyond what the schema already gives.

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 — export the existing editable project to MP4 — and explicitly rules out publishing to social media or an ad account, which separates it from distribution-oriented siblings. An agent can tell this apart from generate_* / remix_project tools without opening a schema.

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

Usage Guidelines5/5

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

Opens with an explicit trigger ('Use when the user wants to download or deliver a finished VideoGen video as an MP4'), states a negative case ('does not publish...'), and gives a prerequisite ('Wait for pending generation or remix work before exporting'). It also names the follow-up tool (get_project_export with the same projectId) for the async path.

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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