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Create composition

after_effects_create_composition

Create a new composition in an existing After Effects project, specifying dimensions, duration, frame rate, and background color. Optionally place it in a folder and open in the viewer.

Instructions

Create a composition in the current After Effects project and optionally place it in a project folder.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
nameYes
widthNo
heightNo
frame_rateNo
folder_nameNo
pixel_aspectNo
open_in_viewerNo
timeout_secondsNo
background_colorNo
duration_secondsNo
Behavior2/5

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

Annotations are minimal (readOnlyHint=false, destructiveHint=false) and the description adds no behavioral details beyond stating the action 'Create'. It does not mention side effects, resource limits, or behaviors like overwriting, which are important for a creation 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, concise sentence, but it lacks structure to aid scanning. While it is not verbose, it omits important details that could be better organized.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness1/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given 10 parameters, no output schema, and no explanation of return values or side effects, the description is far from complete. It fails to inform the agent about what the composition creation entails or what happens upon success/failure.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters1/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

With 0% schema description coverage, the description should compensate by explaining key parameters, but it only hints at 'folder_name' via 'optionally place it in a project folder'. All other parameters (width, height, frame_rate, etc.) are undocumented in the description.

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 verb 'Create' and the resource 'composition' in the context of a current After Effects project, which distinguishes it from sibling tools like after_effects_add_solid that add elements within a composition.

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 like after_effects_add_solid or after_effects_add_text, nor does it mention prerequisites or exclusions.

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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