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VideoGen

by io.github.dg314
OverviewDiscussionsAdmin

Generate music

generate_music

Generate a music track from a text prompt. Typically takes 1–5 minutes depending on track length. Tell the user that wait up front.

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_music"
  }
}

Input Schema

NameRequiredDescriptionDefault
promptYesGenre, mood, instrumentation, and tempo.

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": {
-                  "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 / 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. First observed

TDQS

A3.8/5.0
Behavior4/5

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

Annotations already declare this is a mutating (readOnlyHint=false), non-idempotent, non-destructive, non-open-world operation, so the safety profile is covered. The description adds real behavioral value the annotations cannot carry: the expected 1–5 minute runtime and the instruction to set user expectations before calling. It stops short of noting that repeated calls yield different tracks or that the duration depends on requested track length, but the key operational trait is disclosed.

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?

Three short sentences with zero padding: purpose first, then latency expectation, then the required user-facing action. Every sentence earns its place and the most important information is front-loaded.

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

Completeness4/5

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

An output schema exists, so return-value explanation is correctly omitted, and the main open question for a slow generative call (how long to wait) is answered. Minor gaps remain around whether output length is controllable and what happens if the call fails midway, but the definition is sufficient to invoke the tool 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?

With a single required parameter at 100% schema description coverage ("Genre, mood, instrumentation, and tempo."), the schema already carries the parameter semantics fully. The description only echoes "text prompt" and adds nothing about prompt structure, length limits, or how prompt content influences duration, so it meets but does not exceed the baseline.

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

Purpose4/5

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

States a specific verb and resource ("Generate a music track") plus the input modality ("from a text prompt"), which clearly separates it from non-audio siblings such as generate_image or generate_video_clip. It does not, however, distinguish it from the closely related generate_sound_effect, which an agent would have to disambiguate on its own.

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

Usage Guidelines3/5

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

Usage is only implied by the nature of the tool; there is no explicit statement of when to prefer it over generate_sound_effect, text_to_speech, or voiceover_to_video. The description gives useful operational guidance about the wait, but no selection guidance relative to 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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