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setEffectProperties

Set parameter values or keyframes on an applied effect or plugin in After Effects compositions by specifying composition, layer, effect, and property targets.

Instructions

Set parameter values or keyframes on an applied effect/plugin

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
compNameNoComposition name
layerNameNoLayer name
effectNameNoEffect name (e.g. "Gaussian Blur")
layerIndexNoLayer index
propertiesYesKey-value map of property names and target values (e.g. { "Blurriness": 25 } or with time: { "Blurriness": { time: 1.0, value: 25 } })
effectIndexNoEffect index on the layer

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 behavioral burden. It implies mutation and discloses the dual value/keyframe capability, but says nothing about required permissions, whether existing values are overwritten, or error behavior when the effect/layer is missing.

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

Conciseness4/5

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

A single front-loaded sentence with no wasted words. It is efficient, though its extreme brevity contributes to the missing guidance noted in other dimensions.

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?

For a 6-parameter mutation tool with no annotations and no output schema, one terse sentence is insufficient. It omits prerequisites, sibling disambiguation (setEffectPropertyKeyframe), and overwrite semantics that an agent needs to call it correctly.

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 all six parameters are already documented in the schema, including the key-value map format. The description adds no additional meaning about compName/layerName/effectIndex resolution or the properties map beyond what the schema states, so the baseline of 3 applies.

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?

States a specific verb (Set) and resource (parameter values or keyframes on an applied effect/plugin). However, it does not differentiate itself from the close sibling setEffectPropertyKeyframe, so an agent cannot tell from the description alone when this plural form is preferred over the singular keyframe tool.

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 gives no when-to-use guidance, no prerequisites (e.g. the effect must already be applied), and no routing to alternatives such as applyEffect or setEffectPropertyKeyframe. Usage is left entirely to inference.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.