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rtx1025189518-source

After Effects MCP Server

test-animation

Test animation operations in After Effects by selecting keyframe or expression on a specified composition and layer.

Instructions

Test animation functionality in After Effects

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
compIndexYesComposition index (usually 1)
operationYesThe animation operation to test
layerIndexYesLayer index (usually 1)
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. It does not disclose whether the tool is read-only, modifies state, requires specific permissions, or has side effects. 'Test' could imply a dry run but is ambiguous.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness2/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Description is very short (5 words) but at the expense of necessary clarity. Every sentence should earn its place; here it fails to convey critical information.

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 no output schema, no annotations, and a generic description, the definition is incomplete. It does not explain what 'testing' entails, what the tool returns, or how to interpret results.

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 coverage is 100%, with each parameter having a description. The tool description adds no extra semantics, but the schema itself is clear. Baseline 3 is appropriate.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose2/5

Does the description clearly state what the tool does and how it differs from similar tools?

Description states 'Test animation functionality' but the verb 'test' is generic and does not specify what exactly it does (e.g., validate, dry-run, preview). It fails to distinguish from sibling tools like setLayerKeyframe and setLayerExpression which actually modify animation.

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?

No guidance on when to use this tool vs alternatives. Sibling tools exist for setting keyframes and expressions, but the description does not indicate under what circumstances 'test' is appropriate.

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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