LeanrIQ

Create an advertiser-aware pre-roll or CTV video composition with varied executable scene layouts and channel constraints. It never claims an MP4 master or traffic-ready asset before Studio has rendered and certified one.

build_videoad

Idempotent

Create an advertiser-aware pre-roll or CTV video composition with varied executable scene layouts and channel constraints. It never claims an MP4 master or traffic-ready asset before Studio has rendered and certified one.. Classification: creates billable AI usage. Execution: durable. Task support: optional. Mutation modes: validate_only, preview_only, execute. Partial failure policy: completed_items_not_rolled_back. The returned JSON is internal application state for LeanrIQ and ChatGPT orchestration. Use assistantSummary first when responding to the user. Never display raw JSON, data, or meta unless the user explicitly asks for raw JSON. Mention IDs only when useful for follow-up or debugging. Prefer concise, human language, highlight the most useful insight, and suggest the next best LeanrIQ action. If idempotencyKey is omitted on a mutation, the MCP layer derives a deterministic retry key from the tool and business arguments so an accidental identical replay cannot create duplicate work. For a mutation when more than one seat is authorised, seatId or seatName must be supplied on that exact tool call; a remembered or previously selected seat is not sufficient for a write.

Input Schema

Name	Required	Default
`cta`	No
`offer`	No
`seatId`	No
`channel`	Yes
`product`	No
`campaign`	No
`headline`	No
`seatName`	No
`accountId`	No
`objective`	Yes
`requestId`	No
`skippable`	No
`subtitles`	No
`advertiser`	No
`campaignId`	No
`copyPolicy`	No
`advertiserId`	No
`sourceLocale`	No
`targetMarket`	No
`contentLocale`	No
`editorContext`	No
`marketContext`	No
`targetMarkets`	No
`contentLocales`	No
`idempotencyKey`	No
`sourceAssetIds`	No
`sourceShotMaps`	No
`supportingCopy`	No
`composeInStudio`	No
`contractVersion`	No	build-videoad-v1
`durationSeconds`	No
`shotPlanRequired`	No
`studioCreativeId`	No
`lockedSourceChoices`	No
`approvedCopyVariants`	No
`defaultContentLocale`	No
`sourceFrameImageUrls`	No
`designEvidenceContext`	No
`marketLanguageProfile`	No
`resolvedContentLocale`	No
`voiceoverInstructions`	No
`languageVariantGroupId`	No
`requestedOutputLocales`	No
`supportedContentLocales`	No
`expectedCreativeVersionId`	No

Output Schema

Name	Required	Description	Default
`data`	Yes
`meta`	Yes
`error`	No
`status`	Yes
`assistantSummary`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

Changed6 schema fields changedOct 19, 2026

addedInput schema / properties / approvedCopyVariants

Added value: +{
+  "items": {
+    "additionalProperties": false,
+    "properties": {
+      "body": {
+        "type": "string"
+      },
+      "claimReferences": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "cta": {
+        "type": "string"
+      },
+      "eyebrow": {
+        "type": "string"
+      },
+      "headline": {
+        "type": "string"
+      },
+      "id": {
+        "type": "string"
+      },
+      "legal": {
+        "type": "string"
+      },
+      "proof": {
+        "type": "string"
+      }
+    },
+    "type": "object"
+  },
+  "maxItems": 3,
+  "type": "array"
+}

addedInput schema / properties / copyPolicy

Added value: +{
+  "additionalProperties": false,
+  "properties": {
+    "editableRoles": {
+      "items": {
+        "enum": [
+          "headline",
+          "body",
+          "cta",
+          "legal",
+          "eyebrow",
+          "proof"
+        ],
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "lockedRoles": {
+      "items": {
+        "enum": [
+          "headline",
+          "body",
+          "cta",
+          "legal",
+          "eyebrow",
+          "proof"
+        ],
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "requiredRoles": {
+      "items": {
+        "enum": [
+          "headline",
+          "body",
+          "cta",
+          "legal",
+          "eyebrow",
+          "proof"
+        ],
+        "type": "string"
+      },
+      "type": "array"
+    }
+  },
+  "type": "object"
+}

addedInput schema / properties / designEvidenceContext

Added value: +{
+  "properties": {
+    "brand": {
+      "properties": {
+        "constraints": {
+          "items": {
+            "type": "string"
+          },
+          "type": "array"
+        },
+        "name": {
+          "type": "string"
+        },
+        "tokens": {
+          "additionalProperties": {},
+          "propertyNames": {
+            "type": "string"
+          },
+          "type": "object"
+        },
+        "version": {
+          "anyOf": [
+            {
+              "anyOf": [
+                {
+                  "type": "string"
+                },
+                {
+                  "type": "number"
+                }
+              ]
+            },
+            {
+              "type": "null"
+            }
+          ]
+        }
+      },
+      "type": "object"
+    },
+    "campaign": {
+      "properties": {
+        "audience": {},
+        "objective": {},
+        "proposition": {}
+      },
+      "type": "object"
+    },
+    "copy": {
+      "properties": {
+        "approvedCopyVariants": {},
+        "body": {},
+        "claimReferences": {},
+        "claims": {},
+        "copyPolicy": {},
+        "cta": {},
+        "disclaimer": {},
+        "eyebrow": {},
+        "headline": {},
+        "legal": {},
+        "lockedTexts": {},
+        "mandatoryElements": {},
+        "supportingCopy": {}
+      },
+      "type": "object"
+    },
+    "craftPrecedents": {
+      "default": [],
+      "items": {
+        "additionalProperties": {},
+        "default": null,
+        "propertyNames": {
+          "type": "string"
+        },
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "facts": {
+      "default": [],
+      "items": {
+        "default": null,
+        "properties": {
+          "authority": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "capturedAt": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "evidenceId": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "extractedFacts": {
+            "items": {},
+            "type": "array"
+          },
+          "id": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "observedAt": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "publishedAt": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "sourceId": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "sourceRef": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "sourceType": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "sourceUrl": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "statement": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "summary": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "title": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "url": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          }
+        },
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "locale": {
+      "type": "string"
+    },
+    "opportunity": {
+      "anyOf": [
+        {
+          "properties": {
+            "audienceContext": {
+              "type": "string"
+            },
+            "evidenceIds": {
+              "items": {
+                "type": "string"
+              },
+              "type": "array"
+            },
+            "evidenceSupport": {
+              "items": {
+                "properties": {
+                  "evidenceId": {
+                    "type": "string"
+                  },
+                  "quote": {
+                    "type": "string"
+                  }
+                },
+                "required": [
+                  "evidenceId",
+                  "quote"
+                ],
+                "type": "object"
+              },
+              "type": "array"
+            },
+            "id": {
+              "type": "string"
+            },
+            "measurableHypothesis": {},
+            "messagingTerritory": {
+              "type": "string"
+            },
+            "objective": {
+              "type": "string"
+            },
+            "proposedMessage": {
+              "type": "string"
+            },
+            "reviewAt": {
+              "type": "string"
+            },
+            "supportingEvidenceIds": {
+              "items": {
+                "type": "string"
+              },
+              "type": "array"
+            },
+            "title": {
+              "type": "string"
+            },
+            "visualDirection": {
+              "type": "string"
+            },
+            "visualTerritory": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "id"
+          ],
+          "type": "object"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "schemaVersion": {
+      "const": "design-evidence-context-v1",
+      "type": "string"
+    },
+    "scope": {
+      "properties": {
+        "advertiserId": {
+          "type": "string"
+        },
+        "tenantId": {
+          "type": "string"
+        }
+      },
+      "type": "object"
+    }
+  },
+  "required": [
+    "schemaVersion"
+  ],
+  "type": "object"
+}

addedInput schema / properties / lockedSourceChoices

Added value: +{
+  "items": {
+    "additionalProperties": false,
+    "properties": {
+      "assetId": {
+        "maxLength": 240,
+        "minLength": 1,
+        "type": "string"
+      },
+      "clipId": {
+        "maxLength": 240,
+        "minLength": 1,
+        "type": "string"
+      },
+      "digest": {
+        "pattern": "^sha256:[a-f0-9]{64}$",
+        "type": "string"
+      },
+      "origin": {
+        "const": "first_presented_frame",
+        "type": "string"
+      },
+      "range": {
+        "additionalProperties": false,
+        "properties": {
+          "in": {
+            "maximum": 9007199254740991,
+            "minimum": 0,
+            "type": "integer"
+          },
+          "out": {
+            "maximum": 9007199254740991,
+            "minimum": 0,
+            "type": "integer"
+          }
+        },
+        "required": [
+          "in",
+          "out"
+        ],
+        "type": "object"
+      },
+      "timebase": {
+        "additionalProperties": false,
+        "properties": {
+          "denominator": {
+            "exclusiveMinimum": 0,
+            "maximum": 1000000000,
+            "type": "integer"
+          },
+          "numerator": {
+            "exclusiveMinimum": 0,
+            "maximum": 1000000000,
+            "type": "integer"
+          }
+        },
+        "required": [
+          "numerator",
+          "denominator"
+        ],
+        "type": "object"
+      }
+    },
+    "required": [
+      "clipId",
+      "assetId",
+      "digest",
+      "timebase",
+      "origin",
+      "range"
+    ],
+    "type": "object"
+  },
+  "maxItems": 8,
+  "type": "array"
+}

addedInput schema / properties / shotPlanRequired
```
Added value: +{
+  "type": "boolean"
+}
```

addedInput schema / properties / sourceShotMaps

Added value: +{
+  "items": {
+    "additionalProperties": false,
+    "properties": {
+      "assetId": {
+        "maxLength": 240,
+        "minLength": 1,
+        "type": "string"
+      },
+      "assetVersion": {
+        "maxLength": 240,
+        "minLength": 1,
+        "type": "string"
+      },
+      "audio": {
+        "additionalProperties": false,
+        "properties": {
+          "channels": {
+            "maximum": 9007199254740991,
+            "minimum": 0,
+            "type": "integer"
+          },
+          "codec": {
+            "anyOf": [
+              {
+                "maxLength": 80,
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "music": {
+            "const": "unknown",
+            "type": "string"
+          },
+          "present": {
+            "type": "boolean"
+          },
+          "sampleRate": {
+            "maximum": 9007199254740991,
+            "minimum": 0,
+            "type": "integer"
+          },
+          "speech": {
+            "const": "unknown",
+            "type": "string"
+          }
+        },
+        "required": [
+          "present",
+          "codec",
+          "channels",
+          "sampleRate",
+          "speech",
+          "music"
+        ],
+        "type": "object"
+      },
+      "coverage": {
+        "additionalProperties": false,
+        "properties": {
+          "boundaryToleranceTicks": {
+            "maximum": 9007199254740991,
+            "minimum": 0,
+            "type": "integer"
+          },
+          "complete": {
+            "type": "boolean"
+          },
+          "in": {
+            "maximum": 9007199254740991,
+            "minimum": 0,
+            "type": "integer"
+          },
+          "method": {
+            "enum": [
+              "sampled_scene_change",
+              "continuous_source"
+            ],
+            "type": "string"
+          },
+          "out": {
+            "maximum": 9007199254740991,
+            "minimum": 0,
+            "type": "integer"
+          }
+        },
+        "required": [
+          "in",
+          "out",
+          "complete",
+          "boundaryToleranceTicks",
+          "method"
+        ],
+        "type": "object"
+      },
+      "digest": {
+        "pattern": "^sha256:[a-f0-9]{64}$",
+        "type": "string"
+      },
+      "durationTicks": {
+        "maximum": 9007199254740991,
+        "minimum": 0,
+        "type": "integer"
+      },
+      "frameAccurate": {
+        "type": "boolean"
+      },
+      "frames": {
+        "items": {
+          "additionalProperties": false,
+          "properties": {
+            "digest": {
+              "pattern": "^sha256:[a-f0-9]{64}$",
+              "type": "string"
+            },
+            "id": {
+              "maxLength": 240,
+              "minLength": 1,
+              "type": "string"
+            },
+            "tick": {
+              "maximum": 9007199254740991,
+              "minimum": 0,
+              "type": "integer"
+            },
+            "url": {
+              "anyOf": [
+                {
+                  "maxLength": 4000,
+                  "type": "string"
+                },
+                {
+                  "type": "null"
+                }
+              ]
+            }
+          },
+          "required": [
+            "id",
+            "tick",
+            "digest",
+            "url"
+          ],
+          "type": "object"
+        },
+        "maxItems": 3,
+        "type": "array"
+      },
+      "origin": {
+        "const": "first_presented_frame",
+        "type": "string"
+      },
+      "schemaVersion": {
+        "const": "video-shot-map-v1",
+        "type": "string"
+      },
+      "scope": {
+        "additionalProperties": false,
+        "properties": {
+          "advertiserId": {
+            "maxLength": 240,
+            "minLength": 1,
+            "type": "string"
+          },
+          "channel": {
+            "enum": [
+              "video_preroll",
+              "video_ctv"
+            ],
+            "type": "string"
+          },
+          "locale": {
+            "maxLength": 240,
+            "minLength": 1,
+            "type": "string"
+          },
+          "seatId": {
+            "maxLength": 240,
+            "minLength": 1,
+            "type": "string"
+          }
+        },
+        "required": [
+          "seatId",
+          "advertiserId",
+          "locale",
+          "channel"
+        ],
+        "type": "object"
+      },
+      "shots": {
+        "items": {
+          "additionalProperties": false,
+          "properties": {
+            "copyRegions": {
+              "items": {
+                "additionalProperties": false,
+                "properties": {
+                  "height": {
+                    "exclusiveMinimum": 0,
+                    "maximum": 1,
+                    "type": "number"
+                  },
+                  "width": {
+                    "exclusiveMinimum": 0,
+                    "maximum": 1,
+                    "type": "number"
+                  },
+                  "x": {
+                    "maximum": 1,
+                    "minimum": 0,
+                    "type": "number"
+                  },
+                  "y": {
+                    "maximum": 1,
+                    "minimum": 0,
+                    "type": "number"
+                  }
+                },
+                "required": [
+                  "x",
+                  "y",
+                  "width",
+                  "height"
+                ],
+                "type": "object"
+              },
+              "maxItems": 4,
+              "type": "array"
+            },
+            "id": {
+              "maxLength": 240,
+              "minLength": 1,
+              "type": "string"
+            },
+            "motion": {
+              "additionalProperties": false,
+              "properties": {
+                "camera": {
+                  "const": "unknown",
+                  "type": "string"
+                },
+                "sampledChange": {
+                  "enum": [
+                    "unknown",
+                    "cut_detected"
+                  ],
+                  "type": "string"
+                },
+                "subject": {
+                  "const": "unknown",
+                  "type": "string"
+                }
+              },
+              "required": [
+                "camera",
+                "subject",
+                "sampledChange"
+              ],
+              "type": "object"
+            },
+            "products": {
+              "items": {
+                "maxLength": 160,
+                "type": "string"
+              },
+              "maxItems": 8,
+              "type": "array"
+            },
+            "range": {
+              "additionalProperties": false,
+              "properties": {
+                "in": {
+                  "maximum": 9007199254740991,
+                  "minimum": 0,
+                  "type": "integer"
+                },
+                "out": {
+                  "maximum": 9007199254740991,
+                  "minimum": 0,
+                  "type": "integer"
+                }
+              },
+              "required": [
+                "in",
+                "out"
+              ],
+              "type": "object"
+            },
+            "representativeFrameIds": {
+              "items": {
+                "maxLength": 240,
+                "minLength": 1,
+                "type": "string"
+              },
+              "maxItems": 3,
+              "type": "array"
+            },
+            "semanticEvidence": {
+              "enum": [
+                "unknown",
+                "digest_bound_analysis"
+              ],
+              "type": "string"
+            },
+            "subjects": {
+              "items": {
+                "maxLength": 160,
+                "type": "string"
+              },
+              "maxItems": 8,
+              "type": "array"
+            }
+          },
+          "required": [
+            "id",
+            "range",
+            "representativeFrameIds",
+            "subjects",
+            "products",
+            "copyRegions",
+            "semanticEvidence",
+            "motion"
+          ],
+          "type": "object"
+        },
+        "maxItems": 16,
+        "minItems": 1,
+        "type": "array"
+      },
+      "timebase": {
+        "additionalProperties": false,
+        "properties": {
+          "denominator": {
+            "exclusiveMinimum": 0,
+            "maximum": 1000000000,
+            "type": "integer"
+          },
+          "numerator": {
+            "exclusiveMinimum": 0,
+            "maximum": 1000000000,
+            "type": "integer"
+          }
+        },
+        "required": [
+          "numerator",
+          "denominator"
+        ],
+        "type": "object"
+      }
+    },
+    "required": [
+      "schemaVersion",
+      "scope",
+      "assetId",
+      "digest",
+      "assetVersion",
+      "timebase",
+      "origin",
+      "durationTicks",
+      "frameAccurate",
+      "coverage",
+      "frames",
+      "shots",
+      "audio"
+    ],
+    "type": "object"
+  },
+  "maxItems": 3,
+  "type": "array"
+}

Changed1 schema field changedOct 14, 2026

addedInput schema / properties / editorContext

Added value: +{
+  "additionalProperties": {},
+  "propertyNames": {
+    "type": "string"
+  },
+  "type": "object"
+}

Changed14 schema fields changedOct 13, 2026

addedInput schema / properties / contentLocale
```
Added value: +{
+  "type": "string"
+}
```

addedInput schema / properties / contentLocales

Added value: +{
+  "items": {
+    "type": "string"
+  },
+  "maxItems": 20,
+  "type": "array"
+}

addedInput schema / properties / defaultContentLocale
```
Added value: +{
+  "type": "string"
+}
```

addedInput schema / properties / languageVariantGroupId

Added value: +{
+  "maxLength": 160,
+  "minLength": 1,
+  "type": "string"
+}

addedInput schema / properties / marketContext

Added value: +{
+  "properties": {
+    "currency": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "targetMarket": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "targetMarkets": {
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "timeZone": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    }
+  },
+  "type": "object"
+}

addedInput schema / properties / marketLanguageProfile

Added value: +{
+  "additionalProperties": {},
+  "propertyNames": {
+    "type": "string"
+  },
+  "type": "object"
+}

addedInput schema / properties / requestedOutputLocales

Added value: +{
+  "items": {
+    "type": "string"
+  },
+  "maxItems": 20,
+  "type": "array"
+}

addedInput schema / properties / resolvedContentLocale
```
Added value: +{
+  "type": "string"
+}
```
addedInput schema / properties / sourceLocale
```
Added value: +{
+  "type": "string"
+}
```

addedInput schema / properties / subtitles

Added value: +{
+  "items": {
+    "additionalProperties": false,
+    "properties": {
+      "contentLocale": {
+        "enum": [
+          "en-GB",
+          "zh-HK",
+          "fr-FR",
+          "de-DE",
+          "es-ES"
+        ],
+        "type": "string"
+      },
+      "endSeconds": {
+        "exclusiveMinimum": 0,
+        "type": "number"
+      },
+      "id": {
+        "maxLength": 240,
+        "minLength": 1,
+        "type": "string"
+      },
+      "startSeconds": {
+        "minimum": 0,
+        "type": "number"
+      },
+      "text": {
+        "maxLength": 2000,
+        "minLength": 1,
+        "type": "string"
+      }
+    },
+    "required": [
+      "startSeconds",
+      "endSeconds",
+      "text"
+    ],
+    "type": "object"
+  },
+  "maxItems": 256,
+  "type": "array"
+}

addedInput schema / properties / supportedContentLocales

Added value: +{
+  "items": {
+    "type": "string"
+  },
+  "maxItems": 20,
+  "type": "array"
+}

addedInput schema / properties / targetMarket

Added value: +{
+  "maxLength": 160,
+  "minLength": 1,
+  "type": "string"
+}

addedInput schema / properties / targetMarkets

Added value: +{
+  "items": {
+    "maxLength": 160,
+    "minLength": 1,
+    "type": "string"
+  },
+  "maxItems": 50,
+  "type": "array"
+}

addedInput schema / properties / voiceoverInstructions

Added value: +{
+  "maxLength": 2000,
+  "minLength": 1,
+  "type": "string"
+}

Changed3 schema fields changedOct 6, 2026

addedInput schema / properties / advertiser

Added value: +{
+  "additionalProperties": {},
+  "propertyNames": {
+    "type": "string"
+  },
+  "type": "object"
+}

addedInput schema / properties / campaign

Added value: +{
+  "additionalProperties": {},
+  "propertyNames": {
+    "type": "string"
+  },
+  "type": "object"
+}

addedInput schema / properties / sourceFrameImageUrls

Added value: +{
+  "items": {
+    "maxLength": 4000,
+    "type": "string"
+  },
+  "maxItems": 3,
+  "type": "array"
+}

AddedOct 5, 2026

TDQS

B3.3/5.0

Behavior4/5

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

Beyond the annotations (readOnlyHint=false, destructiveHint=false, idempotentHint=true, openWorldHint=false), the description discloses several traits the annotations do not: it creates billable AI usage, execution is durable, mutation modes, the partial-failure policy (completed_items_not_rolled_back), deterministic idempotency-key derivation, and the seat-provision requirement on mutations. These are meaningful additions, though the 'never claims an MP4 master before Studio certifies' statement is somewhat promotional.

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

Conciseness3/5

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

The purpose is front-loaded, but the opening sentence is copied verbatim from the title (including a duplicated period) and several trailing sentences are generic orchestration boilerplate about assistantSummary and not displaying raw JSON that are not specific to this tool. The mutation/seat notes do earn their place; the response-format boilerplate does not.

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

Completeness3/5

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

For a high-complexity mutation tool with an output schema present, the description covers lifecycle and safety behaviors (modes, partial failure, idempotency, seat requirement) reasonably well. It does not help an agent choose this tool over its video-adjacent siblings, and it leaves 43 of 45 parameters unexplained, which is a notable gap given the schema's richness.

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

Parameters2/5

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

With 45 parameters at 0% schema description coverage, the description must carry the burden, and it explains only a few: seatId/seatName, idempotencyKey, and the channel distinction (pre-roll vs CTV). The vast majority of parameters (sourceShotMaps, lockedSourceChoices, designEvidenceContext, copyPolicy, etc.) get no semantic explanation anywhere.

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?

The name and opening sentence give a specific verb+resource ('Create an advertiser-aware pre-roll or CTV video composition'), which cleanly separates it from build_dooh and the generic build_ad sibling. It lacks an explicit 'unlike build_ad, this one is video-only' statement, so sibling differentiation is inferred rather than stated.

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?

There is no explicit when-to-use / when-not-to-use guidance relative to build_ad, leanriq_build_ad, or build_campaign_creative_set. It does state mutation modes (validate_only, preview_only, execute) and a prerequisite that seatId/seatName must be supplied on write calls with multiple authorised seats, which is partial usage guidance.

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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