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Morpha

by ai.morphareels
OverviewDiscussionsAdmin

Set layer visible

set_layer_visible
Destructive

Show or hide a layer instantly by writing a single opacity keyframe (1 or 0) at frame 0.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
visibleYes
elementIdYes
projectIdYesOpaque project id (a v4 UUID, from list_projects/create_project). Selects which existing project this call mutates.

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
okYesWhether the call succeeded.
dataNoThe payload, shaped by the tool.
noteNoWhat to do next when not ready.
errorNoWhy it failed.
statusNoFor cache-backed readers: whether the answer was ready.
editorUrlNoOpens this project in the editor.

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed2 schema fields changed
    • 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",
-  "visible",
-  "projectId",
-  "anonymousToken"
-]New value: +[
+  "elementId",
+  "visible",
+  "projectId"
+]
  2. Changed1 schema field changed
    • 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"
+}
  3. Changed2 schema fields changed
    • 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",
-  "visible",
-  "projectId"
-]New value: +[
+  "elementId",
+  "visible",
+  "projectId",
+  "anonymousToken"
+]
  4. First observed

TDQS

A4.2/5.0
Behavior4/5

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

Annotations already declare destructiveHint=true and readOnlyHint=false, so the agent knows this mutates state. The description adds valuable behavioral context: it writes a keyframe at frame 0, meaning it affects the animation timeline and is not just a transient UI state. It also implies the layer's opacity is permanently set to 1 or 0 at frame 0, which could affect subsequent keyframes. This goes beyond the annotations.

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?

One sentence, front-loaded with the action and mechanism. Every word earns its place. The key behavioral detail (single keyframe at frame 0) is included without bloat.

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?

The tool has an output schema (not shown) and only 3 simple parameters. The description explains the core behavior and the key side effect (keyframe at frame 0). It doesn't mention whether this overwrites existing opacity keyframes or how it interacts with animated opacity, but for a simple boolean toggle, the description is largely complete. The destructiveHint annotation covers the mutation warning.

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 only 33% (only projectId is described). The description adds meaning for the 'visible' parameter (1 or 0) but doesn't explain elementId beyond its name. However, elementId is a common pattern across sibling tools and its meaning is inferable. The description partially compensates for the schema gap but doesn't fully document all parameters.

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 states a specific verb ('Show or hide'), a resource ('a layer'), and the mechanism ('writing a single opacity keyframe (1 or 0) at frame 0'). This clearly distinguishes it from sibling tools like remove_layer, fade_layer, and set_layer_transition, which have different purposes.

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

Usage Guidelines4/5

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

The description implies the use case: instantly toggling layer visibility without animation. It doesn't explicitly name alternatives like fade_layer for animated visibility, but the mechanism ('instantly', 'single keyframe') makes the contrast clear. It lacks explicit when-not-to-use guidance, but the context is sufficient for an agent to select it correctly.

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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