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Add audio clip

add_audio

Add an audio file (music or voiceover) to a CapCut draft at a specific timeline position with optional duration, source start, and volume settings.

Instructions

Adds an audio file (music, voiceover) to a draft audio track.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
pathYesAbsolute path to the audio file (supports ~).
draftYesTarget draft name.
volumeNoClip volume, 0..2. Default 1.
atSecondsNoTimeline position in seconds. Defaults to the end of the track.
durationSecondsNoClip length in seconds. Defaults to the full audio.
sourceStartSecondsNoWhere the clip starts inside the source audio. Default 0.
Behavior2/5

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

No annotations provided; description lacks details on side effects (e.g., replaces or appends? requires existing draft?), authorization needs, or error behavior.

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?

Single sentence, 13 words, front-loaded and to the point.

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?

No output schema, no annotations, and description is too brief for a 6-parameter tool; lacks info on return values, error conditions, and usage context.

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% so parameters are already described; description adds no extra semantic context beyond the schema.

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?

Description clearly states verb 'adds' and resource 'audio file (music, voiceover) to a draft audio track', distinguishing it from siblings like add_image, add_text, add_video.

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 versus alternatives, no prerequisites or exclusions mentioned.

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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