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Valmera — AI Video Editor

by io.valmera
OverviewDiscussionsAdmin

Set overlay motion

set_overlay_motion
Idempotent

Sets scalar or element-local keyframe curves for an existing overlay's position, scale, rotation and opacity. Keyframe time zero is the overlay's start. Full-frame covers and tracked screen takeovers have separate geometry constraints.

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": {
      "id": "<id>",
      "motion": "<motion>",
      "project_id": "<project_id>"
    },
    "name": "set_overlay_motion"
  }
}

Input Schema

NameRequiredDescriptionDefault
idYes
motionYesElement-local visual-overlay curves. t is seconds from the overlay's own start; x/y and scale are frame fractions, rotation is degrees, opacity is 0..1.
project_idYesExplicit project identifier for this request. The connection's navigation pointer does not select the target.
motion_motifNoActive Blueprint motion motif id this event executes; never 'hold'.

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changed
    • changedInput schema / properties / project_id / description
      Previous value: -"Required immutable scope for this call. Copy the id from list_projects/open_project/project_state; the active-project pointer is never used to guess."New value: +"Explicit project identifier for this request. The connection's navigation pointer does not select the target."
  2. Changed5 schema fields changed
    • changedInput schema / properties / motion / properties / opacity / anyOf
      Previous value: -[
-  {
-    "type": "number"
-  },
-  {
-    "items": {
-      "properties": {
-        "ease": {
-          "enum": [
-            "linear",
-            "in",
-            "out",
-            "in_out",
-            "hold"
-          ],
-          "type": "string"
-        },
-        "t": {
-          "type": "number"
-        },
-        "v": {
-          "type": "number"
-        }
-      },
-      "required": [
-        "t",
-        "v"
-      ],
-      "type": "object"
-    },
-    "minItems": 1,
-    "type": "array"
-  }
-]New value: +[
+  {
+    "type": "number"
+  },
+  {
+    "items": {
+      "properties": {
+        "ease": {
+          "enum": [
+            "linear",
+            "in",
+            "out",
+            "in_out",
+            "hold"
+          ],
+          "type": "string"
+        },
+        "t": {
+          "minimum": 0,
+          "type": "number"
+        },
+        "v": {
+          "type": "number"
+        }
+      },
+      "required": [
+        "t",
+        "v"
+      ],
+      "type": "object"
+    },
+    "maxItems": 24,
+    "minItems": 1,
+    "type": "array"
+  }
+]
    • changedInput schema / properties / motion / properties / rotation / anyOf
      Previous value: -[
-  {
-    "type": "number"
-  },
-  {
-    "items": {
-      "properties": {
-        "ease": {
-          "enum": [
-            "linear",
-            "in",
-            "out",
-            "in_out",
-            "hold"
-          ],
-          "type": "string"
-        },
-        "t": {
-          "type": "number"
-        },
-        "v": {
-          "type": "number"
-        }
-      },
-      "required": [
-        "t",
-        "v"
-      ],
-      "type": "object"
-    },
-    "minItems": 1,
-    "type": "array"
-  }
-]New value: +[
+  {
+    "type": "number"
+  },
+  {
+    "items": {
+      "properties": {
+        "ease": {
+          "enum": [
+            "linear",
+            "in",
+            "out",
+            "in_out",
+            "hold"
+          ],
+          "type": "string"
+        },
+        "t": {
+          "minimum": 0,
+          "type": "number"
+        },
+        "v": {
+          "type": "number"
+        }
+      },
+      "required": [
+        "t",
+        "v"
+      ],
+      "type": "object"
+    },
+    "maxItems": 24,
+    "minItems": 1,
+    "type": "array"
+  }
+]
    • changedInput schema / properties / motion / properties / scale / anyOf
      Previous value: -[
-  {
-    "type": "number"
-  },
-  {
-    "items": {
-      "properties": {
-        "ease": {
-          "enum": [
-            "linear",
-            "in",
-            "out",
-            "in_out",
-            "hold"
-          ],
-          "type": "string"
-        },
-        "t": {
-          "type": "number"
-        },
-        "v": {
-          "type": "number"
-        }
-      },
-      "required": [
-        "t",
-        "v"
-      ],
-      "type": "object"
-    },
-    "minItems": 1,
-    "type": "array"
-  }
-]New value: +[
+  {
+    "type": "number"
+  },
+  {
+    "items": {
+      "properties": {
+        "ease": {
+          "enum": [
+            "linear",
+            "in",
+            "out",
+            "in_out",
+            "hold"
+          ],
+          "type": "string"
+        },
+        "t": {
+          "minimum": 0,
+          "type": "number"
+        },
+        "v": {
+          "type": "number"
+        }
+      },
+      "required": [
+        "t",
+        "v"
+      ],
+      "type": "object"
+    },
+    "maxItems": 24,
+    "minItems": 1,
+    "type": "array"
+  }
+]
    • changedInput schema / properties / motion / properties / x / anyOf
      Previous value: -[
-  {
-    "type": "number"
-  },
-  {
-    "items": {
-      "properties": {
-        "ease": {
-          "enum": [
-            "linear",
-            "in",
-            "out",
-            "in_out",
-            "hold"
-          ],
-          "type": "string"
-        },
-        "t": {
-          "type": "number"
-        },
-        "v": {
-          "type": "number"
-        }
-      },
-      "required": [
-        "t",
-        "v"
-      ],
-      "type": "object"
-    },
-    "minItems": 1,
-    "type": "array"
-  }
-]New value: +[
+  {
+    "type": "number"
+  },
+  {
+    "items": {
+      "properties": {
+        "ease": {
+          "enum": [
+            "linear",
+            "in",
+            "out",
+            "in_out",
+            "hold"
+          ],
+          "type": "string"
+        },
+        "t": {
+          "minimum": 0,
+          "type": "number"
+        },
+        "v": {
+          "type": "number"
+        }
+      },
+      "required": [
+        "t",
+        "v"
+      ],
+      "type": "object"
+    },
+    "maxItems": 24,
+    "minItems": 1,
+    "type": "array"
+  }
+]
    • changedInput schema / properties / motion / properties / y / anyOf
      Previous value: -[
-  {
-    "type": "number"
-  },
-  {
-    "items": {
-      "properties": {
-        "ease": {
-          "enum": [
-            "linear",
-            "in",
-            "out",
-            "in_out",
-            "hold"
-          ],
-          "type": "string"
-        },
-        "t": {
-          "type": "number"
-        },
-        "v": {
-          "type": "number"
-        }
-      },
-      "required": [
-        "t",
-        "v"
-      ],
-      "type": "object"
-    },
-    "minItems": 1,
-    "type": "array"
-  }
-]New value: +[
+  {
+    "type": "number"
+  },
+  {
+    "items": {
+      "properties": {
+        "ease": {
+          "enum": [
+            "linear",
+            "in",
+            "out",
+            "in_out",
+            "hold"
+          ],
+          "type": "string"
+        },
+        "t": {
+          "minimum": 0,
+          "type": "number"
+        },
+        "v": {
+          "type": "number"
+        }
+      },
+      "required": [
+        "t",
+        "v"
+      ],
+      "type": "object"
+    },
+    "maxItems": 24,
+    "minItems": 1,
+    "type": "array"
+  }
+]
  3. First observed

TDQS

B3.4/5.0
Behavior3/5

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

Annotations already declare this is a non-destructive, idempotent, non-open-world mutation, so the safety profile is covered. The description adds the meaningful timing baseline (keyframe time zero = overlay start) and the caveat about different geometry constraints for covers/takeovers, but it does not say whether an existing curve set is replaced or merged, nor what happens on invalid overlay ids or excessive keyframe counts.

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?

Three short sentences, front-loaded with what is set and on what target, followed by the timing convention and the geometry caveat. No padding or redundant restatement of the title.

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?

Covers the core semantics of a 4-parameter nested mutation with no output schema, but leaves gaps an agent would care about: replace-vs-merge behavior on repeated calls, interaction with the optional motion_motif blueprint id, and the practical consequence of the covers/takeovers geometry restriction.

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

Parameters3/5

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

Schema description coverage is 75% and the nested motion object already documents units (frame fractions, degrees, 0..1, seconds from overlay start), so the schema does most of the work. The description's contribution is mainly restating the scalar-vs-keyframe duality and the time-zero convention, with no added detail on the motion_motif parameter or how partial motion objects combine with existing curves.

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?

Names a specific verb (sets) and resource (keyframe curves for an overlay's position, scale, rotation, opacity), and distinguishes the scalar form from the element-local keyframe form. It also signals that covers and tracked screen takeovers have separate geometry constraints, which helps separate this tool from related motion tools, though no sibling is named explicitly.

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?

"For an existing overlay" implies the overlay must already exist (i.e. add_overlay first), which is useful implicit routing. But there is no explicit when-to-use guidance versus set_text_motion, set_motion_graphic, or move_overlay, and no statement about what to do for full-frame covers or tracked takeovers beyond noting they differ.

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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