BlitzReels Video Editor

Migrate Legacy Carousel

carousels_migrate

DestructiveIdempotent

Rebuild a compile slot document from a legacy overlay carousel. Then patch slots like any compiled deck.

Input Schema

Name	Required	Description
`projectId`	Yes	UUID string.
`workspaceId`	No
`idempotencyKey`	Yes

Output Schema

Name	Required	Description	Default
`kit`	No
`name`	No
`frame`	No
`style`	No
`locale`	No
`slides`	No
`can_undo`	No
`platform`	No
`revision`	No
`warnings`	No
`templates`	No
`font_faces`	No
`project_id`	No
`next_actions`	No
`mutationReceipt`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed5 schema fields changedOct 18, 2026

addedOutput schema / properties / font_faces

Added value: +{
+  "items": {
+    "additionalProperties": false,
+    "properties": {
+      "family": {
+        "maxLength": 160,
+        "minLength": 1,
+        "type": "string"
+      },
+      "src": {
+        "maxLength": 4000,
+        "minLength": 1,
+        "type": "string"
+      },
+      "style": {
+        "enum": [
+          "normal",
+          "italic",
+          "oblique"
+        ],
+        "type": "string"
+      },
+      "unicodeRange": {
+        "maxLength": 8000,
+        "type": "string"
+      },
+      "weight": {
+        "maxLength": 32,
+        "minLength": 1,
+        "type": "string"
+      }
+    },
+    "required": [
+      "family",
+      "src",
+      "weight",
+      "style",
+      "unicodeRange"
+    ],
+    "type": "object"
+  },
+  "maxItems": 256,
+  "type": "array"
+}

addedOutput schema / properties / slides / items / properties / visual / properties / creative_artifact_id

Added value: +{
+  "format": "uuid",
+  "pattern": "^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|ffffffff-ffff-ffff-ffff-ffffffffffff)$",
+  "type": "string"
+}

addedOutput schema / properties / slides / items / properties / visual / properties / creative_source

Added value: +{
+  "additionalProperties": false,
+  "properties": {
+    "artifact_id": {
+      "format": "uuid",
+      "pattern": "^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|ffffffff-ffff-ffff-ffff-ffffffffffff)$",
+      "type": "string"
+    },
+    "composition_id": {
+      "minLength": 1,
+      "type": "string"
+    },
+    "controls": {
+      "anyOf": [
+        {
+          "additionalProperties": false,
+          "properties": {
+            "fields": {
+              "items": {
+                "oneOf": [
+                  {
+                    "additionalProperties": false,
+                    "properties": {
+                      "key": {
+                        "maxLength": 80,
+                        "minLength": 1,
+                        "pattern": "^[A-Za-z][A-Za-z0-9_]*$",
+                        "type": "string"
+                      },
+                      "label": {
+                        "maxLength": 120,
+                        "minLength": 1,
+                        "type": "string"
+                      },
+                      "maxLength": {
+                        "maximum": 10000,
+                        "minimum": 1,
+                        "type": "integer"
+                      },
+                      "type": {
+                        "const": "text",
+                        "type": "string"
+                      }
+                    },
+                    "required": [
+                      "key",
+                      "label",
+                      "type",
+                      "maxLength"
+                    ],
+                    "type": "object"
+                  },
+                  {
+                    "additionalProperties": false,
+                    "properties": {
+                      "key": {
+                        "maxLength": 80,
+                        "minLength": 1,
+                        "pattern": "^[A-Za-z][A-Za-z0-9_]*$",
+                        "type": "string"
+                      },
+                      "label": {
+                        "maxLength": 120,
+                        "minLength": 1,
+                        "type": "string"
+                      },
+                      "type": {
+                        "const": "color",
+                        "type": "string"
+                      }
+                    },
+                    "required": [
+                      "key",
+                      "label",
+                      "type"
+                    ],
+                    "type": "object"
+                  },
+                  {
+                    "additionalProperties": false,
+                    "properties": {
+                      "key": {
+                        "maxLength": 80,
+                        "minLength": 1,
+                        "pattern": "^[A-Za-z][A-Za-z0-9_]*$",
+                        "type": "string"
+                      },
+                      "label": {
+                        "maxLength": 120,
+                        "minLength": 1,
+                        "type": "string"
+                      },
+                      "type": {
+                        "const": "media",
+                        "type": "string"
+                      }
+                    },
+                    "required": [
+                      "key",
+                      "label",
+                      "type"
+                    ],
+                    "type": "object"
+                  },
+                  {
+                    "additionalProperties": false,
+                    "properties": {
+                      "key": {
+                        "maxLength": 80,
+                        "minLength": 1,
+                        "pattern": "^[A-Za-z][A-Za-z0-9_]*$",
+                        "type": "string"
+                      },
+                      "label": {
+                        "maxLength": 120,
+                        "minLength": 1,
+                        "type": "string"
+                      },
+                      "max": {
+                        "maximum": 10800,
+                        "type": "number"
+                      },
+                      "min": {
+                        "minimum": 0,
+                        "type": "number"
+                      },
+                      "step": {
+                        "exclusiveMinimum": 0,
+                        "type": "number"
+                      },
+                      "type": {
+                        "const": "timing",
+                        "type": "string"
+                      }
+                    },
+                    "required": [
+                      "key",
+                      "label",
+                      "type",
+                      "min",
+                      "max",
+                      "step"
+                    ],
+                    "type": "object"
+                  }
+                ]
+              },
+              "maxItems": 40,
+              "minItems": 1,
+              "type": "array"
+            },
+            "file": {
+              "format": "ends_with",
+              "maxLength": 180,
+              "minLength": 1,
+              "pattern": ".*\\.json$",
+              "type": "string"
+            }
+          },
+          "required": [
+            "file",
+            "fields"
+          ],
+          "type": "object"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "fps": {
+      "exclusiveMinimum": 0,
+      "type": "number"
+    },
+    "frame": {
+      "maximum": 9007199254740991,
+      "minimum": 0,
+      "type": "integer"
+    },
+    "frame_hash": {
+      "pattern": "^[a-f0-9]{64}$",
+      "type": "string"
+    },
+    "height": {
+      "exclusiveMinimum": 0,
+      "maximum": 9007199254740991,
+      "type": "integer"
+    },
+    "media_asset_id": {
+      "format": "uuid",
+      "pattern": "^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|ffffffff-ffff-ffff-ffff-ffffffffffff)$",
+      "type": "string"
+    },
+    "project_id": {
+      "format": "uuid",
+      "pattern": "^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|ffffffff-ffff-ffff-ffff-ffffffffffff)$",
+      "type": "string"
+    },
+    "runtime_identity": {
+      "minLength": 1,
+      "type": "string"
+    },
+    "source_hash": {
+      "pattern": "^[a-f0-9]{64}$",
+      "type": "string"
+    },
+    "source_revision": {
+      "exclusiveMinimum": 0,
+      "maximum": 9007199254740991,
+      "type": "integer"
+    },
+    "source_revision_id": {
+      "format": "uuid",
+      "pattern": "^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|ffffffff-ffff-ffff-ffff-ffffffffffff)$",
+      "type": "string"
+    },
+    "values": {
+      "additionalProperties": {
+        "anyOf": [
+          {
+            "maxLength": 10000,
+            "type": "string"
+          },
+          {
+            "type": "number"
+          }
+        ]
+      },
+      "propertyNames": {
+        "maxLength": 80,
+        "minLength": 1,
+        "pattern": "^[A-Za-z][A-Za-z0-9_]*$",
+        "type": "string"
+      },
+      "type": "object"
+    },
+    "width": {
+      "exclusiveMinimum": 0,
+      "maximum": 9007199254740991,
+      "type": "integer"
+    }
+  },
+  "required": [
+    "artifact_id",
+    "project_id",
+    "source_revision_id",
+    "source_revision",
+    "source_hash",
+    "runtime_identity",
+    "composition_id",
+    "frame",
+    "width",
+    "height",
+    "fps",
+    "frame_hash",
+    "media_asset_id",
+    "controls",
+    "values"
+  ],
+  "type": "object"
+}

addedOutput schema / properties / slides / items / properties / visual / properties / crop

Added value: +{
+  "additionalProperties": false,
+  "properties": {
+    "height": {
+      "exclusiveMinimum": 0,
+      "maximum": 1,
+      "type": "number"
+    },
+    "left": {
+      "maximum": 1,
+      "minimum": 0,
+      "type": "number"
+    },
+    "top": {
+      "maximum": 1,
+      "minimum": 0,
+      "type": "number"
+    },
+    "width": {
+      "exclusiveMinimum": 0,
+      "maximum": 1,
+      "type": "number"
+    }
+  },
+  "required": [
+    "left",
+    "top",
+    "width",
+    "height"
+  ],
+  "type": "object"
+}

changedOutput schema / properties / slides / items / properties / visual / properties / kind / enum

Previous value: -[
-  "media_asset",
-  "generate",
-  "solid",
-  "gradient",
-  "html",
-  "template"
-]New value: +[
+  "creative_source",
+  "media_asset",
+  "generate",
+  "solid",
+  "gradient",
+  "html",
+  "template"
+]

AddedSep 17, 2026

TDQS

B3.1/5.0

Behavior3/5

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

Annotations already declare destructiveHint=true and idempotentHint=true, so the safety profile is largely covered. The description adds the behavioral context that the result is a normal compiled deck and can subsequently be patched, but it never says what gets destroyed or replaced (the existing document? the legacy carousel?), which matters for a destructive operation.

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?

Two tight sentences with no filler, and the core action is front-loaded. It is arguably under-specified rather than over-long, so conciseness itself is good.

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

Completeness2/5

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

For a destructive, jargon-heavy migration tool, the description leaves out when to use it versus carousels_compile, what happens to the legacy source after migration, and any meaning for the required idempotencyKey. The output schema covers return values, but the operational context is thin.

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?

Schema description coverage is only 33% – only projectId has even a minimal 'UUID string.' note, while idempotencyKey and workspaceId are undocumented in both schema and description. The description contributes nothing about parameters, so it fails to compensate for the coverage gap.

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 description names a specific verb and resource: rebuilding a 'compile slot document' from a 'legacy overlay carousel'. That is more than a restatement of the name 'carousels_migrate', but it never differentiates itself from close siblings such as carousels_compile or carousels_get, and the internal jargon ('compile slot document') is undefined.

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?

'Then patch slots like any compiled deck' implies a downstream workflow (the output behaves like a compiled deck and can be patched), which is useful implied usage. However, it never states when to choose migration over carousels_compile or carousels_apply_template, nor any precondition such as 'only for legacy overlay carousels'.

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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