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TheLlamainator

After Effects MCP Server

apply-effect

Apply any effect to a layer in an After Effects composition by specifying its name, match name, or preset path, and optionally set effect parameters.

Instructions

Apply an effect to a layer in After Effects

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
compIndexYes1-based index of the target composition in the project panel.
layerIndexYes1-based index of the target layer within the composition.
effectNoGeneric effect identifier. Can be either exact display name or matchName.
effectIdentifierNoAlias for effect. Can be either exact display name or matchName.
effectNameNoDisplay name of the effect to apply (e.g., 'Gaussian Blur').
effectMatchNameNoAfter Effects internal name for the effect (more reliable, e.g., 'ADBE Gaussian Blur 2').
effectCategoryNoOptional category for filtering effects.
presetPathNoOptional path to an effect preset file (.ffx).
effectSettingsNoOptional parameters for the effect (e.g., { 'Blurriness': 25 }).
Behavior2/5

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

With no annotations, the description carries full burden but only states the basic action. It does not disclose whether the effect is added or replaced, permission requirements, or side effects, which are critical for a mutating tool.

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

Conciseness3/5

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

The description is a single sentence, making it concise but lacking structure and detail. It front-loads the basic purpose but omits critical behavioral info, making it too brief to be optimally useful.

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 9 parameters and no output schema, the description is very incomplete. It fails to explain return values, error conditions, or how effects are applied, leaving significant gaps for the agent.

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?

The input schema has 100% description coverage, so the schema itself documents parameters well. The tool description adds no additional meaning beyond what is in the schema, earning a baseline score of 3.

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 (apply an effect) and the target (a layer in After Effects). However, it does not differentiate from sibling tools like 'add-any-effect' or 'apply-effect-template', which likely perform similar functions.

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 is provided on when to use this tool versus alternatives. There is no mention of use cases, prerequisites, or exclusions, leaving the agent without context for selection.

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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