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set-effect-keyframe

Set a keyframe for an effect property in After Effects. Specify composition, layer, effect, property path, value, and time, with optional graph interpolation and easy-ease controls.

Instructions

Set an effect property keyframe with optional graph interpolation and easy-ease controls.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
valueNoValue to set at the keyframe time.
compIndexYes1-based index of the target composition in the project panel.
effectNameNoDisplay name of the effect to target.
layerIndexYes1-based index of the target layer within the composition.
effectIndexNo1-based index of the effect in the layer's Effects group.
propertyNameNoFallback target property name or matchName.
propertyPathNoPath from effect root to target property, e.g. ['Compositing Options', 'Effect Opacity'] or [3, 1].
keyframeIndexNoOptional keyframe index to edit graph/value directly without resolving by time.
propertyIndexNoFallback target property index under the effect root.
timeInSecondsNoTime of the keyframe in seconds.
effectMatchNameNoInternal matchName of the effect to target.
keyframeOptionsNoOptional graph/easing controls for the created keyframe.
Behavior2/5

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

The description does not disclose key behavioral traits such as whether existing keyframes are overwritten, what happens if the property cannot be keyframed, or any permission requirements. Since no annotations are provided, the description carries the full burden, which it fails to meet.

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, front-loaded sentence that immediately conveys the tool's purpose and optional capabilities. No extraneous information, earning its place efficiently.

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 tool's complexity (12 parameters, nested keyframeOptions object, no output schema), the description is too sparse. It lacks information about typical use cases, side effects, or result expectations, leaving 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% coverage, describing all 12 parameters in detail. The description adds minimal value beyond summarizing the keyframeOptions feature. Baseline score of 3 is appropriate as schema does the heavy lifting.

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 clearly states the tool's action ('Set an effect property keyframe') and specifies optional features ('graph interpolation and easy-ease controls'). This verb+resource combination effectively distinguishes it from sibling tools like setLayerKeyframe and set-effect-property.

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 explicit guidance on when to use this tool versus alternatives (e.g., set-layer-keyframe) or when not to use it. The context is implied by the phrasing 'effect property keyframe' but lacks direct comparison or exclusion criteria.

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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