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by p10q
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convert_keyframes_to_expression

Transform keyframed animation into expressions for Adobe After Effects, enabling dynamic control over layer properties without manual keyframing.

Instructions

Convert keyframed animation to an expression

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": {
      "compId": "<compId>",
      "layerIndex": "<layerIndex>",
      "propertyPath": "<propertyPath>"
    },
    "name": "convert_keyframes_to_expression"
  }
}

Input Schema

NameRequiredDescriptionDefault
compIdYesID of the composition
layerIndexYesIndex of the layer
propertyPathYesProperty path
expressionTypeNoType of expression to generate from keyframeslinear
customExpressionNoCustom expression template (for custom type)

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.0.0

TDQS

C2.9/5.0
Behavior2/5

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It states the conversion action but lacks critical details: whether this is a destructive operation (replacing keyframes with an expression), what permissions or prerequisites are needed, how errors are handled, or what the output looks like. For a tool that likely modifies animation data, this is a significant gap in transparency.

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 a single, clear sentence with zero wasted words. It's front-loaded with the core action ('convert') and immediately states the transformation ('keyframed animation to an expression'). There's no redundancy or unnecessary elaboration, making it highly efficient for an agent to parse.

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?

Given the complexity of converting animation data and the lack of annotations and output schema, the description is insufficient. It doesn't address behavioral aspects like side effects, error conditions, or output format, leaving the agent with incomplete context for safe and effective use. For a tool with 5 parameters and no structured safety hints, more guidance is needed.

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 100%, so the schema fully documents all 5 parameters. The description adds no additional meaning beyond the schema—it doesn't explain relationships between parameters (e.g., how 'expressionType' interacts with 'customExpression') or provide context for usage. This meets the baseline for high schema coverage but doesn't enhance understanding.

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 clearly states the action ('convert') and target ('keyframed animation to an expression'), making the purpose immediately understandable. It distinguishes itself from siblings like 'add_expression_control' or 'set_expression' by focusing on conversion from existing keyframes rather than creating or applying expressions directly. However, it doesn't specify the exact resource (e.g., 'property keyframes'), leaving some ambiguity.

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

Usage Guidelines2/5

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

The description provides no guidance on when to use this tool versus alternatives. With many sibling tools related to expressions and keyframes (e.g., 'set_expression', 'set_keyframe', 'add_loop_expression'), there's no indication of prerequisites, typical workflows, or scenarios where conversion is preferred over other methods. The agent must infer usage from the name alone.

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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