MorphaReels

Shift group

shift_group

Destructive

MOVE a group and everything inside it along the timeline, keeping its internal timing intact — the 'slide this whole section later' operation. A plain group is a relative CONTAINER: it has no window of its own, so on the timeline it spans the hull of its contents, and moving it slides the whole subtree as one rigid body. start is the ABSOLUTE frame the group's window should end up at, not a delta, so calling it twice with the same value is a no-op. Descendants keep their spacing; the move stops when the earliest thing inside reaches frame 0. Welded caption lines are deliberately left behind (they follow their clip's speech, not this group), and an embedded morpha band moves as one unit. Fails when the group is empty or holds an always-present layer — there is no bounded window to move. To CLIP what is shown of a group rather than move it, use set_group_window; for a single layer use set_layer_block.

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": {
      "elementId": "<elementId>",
      "start": "<start>",
      "projectId": "<projectId>"
    },
    "name": "shift_group"
  }
}

Input Schema

Name	Required	Description
`start`	Yes	ABSOLUTE frame the group's window should start at after the move (0-indexed, 30 fps) — not an offset.
`elementId`	Yes	The group's id (group.<id> or the bare <id>).
`projectId`	Yes	Opaque project id (a v4 UUID, from list_projects/create_project). Selects which existing project this call mutates.

Output Schema

Name	Required	Description
`ok`	Yes	Whether the call succeeded.
`data`	No	The payload, shaped by the tool.
`note`	No	What to do next when not ready.
`error`	No	Why it failed.
`status`	No	For cache-backed readers: whether the answer was ready.
`editorUrl`	No	Opens this project in the editor.

Schema Changelog

Changes observed during successful MCP inspections.

Changed2 schema fields changedSep 17, 2026

removedInput schema / properties / anonymousToken

Removed value: -{
-  "description": "The token create_anonymous_account returned. This connection has no Morpha key, so every call carries it.",
-  "type": "string"
-}

changedInput schema / required

Previous value: -[
-  "elementId",
-  "start",
-  "projectId",
-  "anonymousToken"
-]New value: +[
+  "elementId",
+  "start",
+  "projectId"
+]

Changed1 schema field changedSep 15, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "description": "The result envelope every Morpha tool returns.",
+  "properties": {
+    "data": {
+      "description": "The payload, shaped by the tool.",
+      "type": [
+        "object",
+        "array",
+        "string",
+        "number",
+        "boolean",
+        "null"
+      ]
+    },
+    "editorUrl": {
+      "description": "Opens this project in the editor.",
+      "type": "string"
+    },
+    "error": {
+      "description": "Why it failed.",
+      "type": "string"
+    },
+    "note": {
+      "description": "What to do next when not ready.",
+      "type": "string"
+    },
+    "ok": {
+      "description": "Whether the call succeeded.",
+      "type": "boolean"
+    },
+    "status": {
+      "description": "For cache-backed readers: whether the answer was ready.",
+      "enum": [
+        "ready",
+        "not-ready"
+      ],
+      "type": "string"
+    }
+  },
+  "required": [
+    "ok"
+  ],
+  "type": "object"
+}

Changed2 schema fields changedSep 11, 2026

addedInput schema / properties / anonymousToken

Added value: +{
+  "description": "The token create_anonymous_account returned. This connection has no Morpha key, so every call carries it.",
+  "type": "string"
+}

changedInput schema / required

Previous value: -[
-  "elementId",
-  "start",
-  "projectId"
-]New value: +[
+  "elementId",
+  "start",
+  "projectId",
+  "anonymousToken"
+]

First observedSep 7, 2026

TDQS

A4.9/5.0

Behavior5/5

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

Beyond the destructiveHint annotation, the description discloses important behavioral traits: start is absolute and idempotent, descendants keep spacing, the move clamps at frame 0, welded caption lines are intentionally left behind, and embedded morpha bands move as a unit. These details materially help an agent predict side effects without running the operation.

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?

The description is dense but every sentence carries operational meaning, and the core purpose is front-loaded in the first clause. It uses clear formatting with emphatic terms and structured caveats, and while longer than average, the length is justified by the tool's non-obvious behavior.

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?

For a mutating tool with three required parameters, the description covers semantics, scope, edge cases, failure modes, and alternatives. It also references the output schema's existence indirectly by not needing to describe return values, and it leaves an agent with no material unknowns about how the operation behaves.

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

Parameters4/5

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

Schema description coverage is 100%, so the schema already explains start as an absolute frame and not an offset. The description adds further value by emphasizing idempotence ('calling it twice with the same value is a no-op') and clarifying that the group's window ends up at that absolute frame, which supplements the schema without redundancy.

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?

The description opens with a specific verb and resource: 'MOVE a group and everything inside it along the timeline, keeping its internal timing intact.' It clearly distinguishes the tool from related operations by naming set_group_window and set_layer_block as the clipping alternatives, so an agent can select it without ambiguity.

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?

The description explicitly states when this tool is appropriate ('slide this whole section later') and gives concrete when-not guidance: use set_group_window for clipping a group and set_layer_block for a single layer. It also documents failure conditions when the group is empty or contains an always-present layer, giving an agent clear criteria for invocation.

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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