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change_speed

Adjust a clip's playback speed in a Final Cut Pro XML timeline using a speed multiplier for slow motion or fast motion effects, with optional pitch preservation.

Instructions

Change clip playback speed (slow motion or speed up)

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
filepathYes
clip_idYes
speedYesSpeed multiplier (0.5 = half, 2.0 = double)
preserve_pitchNo
output_pathNo
Behavior2/5

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

With no annotations provided, the description bears the full burden of disclosing behavioral traits, but it only states the basic action without mentioning side effects, permissions, or whether the operation is destructive, leaving significant gaps.

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?

The description is extremely concise at one sentence, which is efficient and front-loaded with the action. However, it could slightly expand on parameter context without being wasteful.

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 has 5 parameters, no output schema, and many siblings, the description is insufficiently complete. It does not explain return values, prerequisites, or how this tool relates to sibling speed-related operations.

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

Parameters2/5

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

Schema description coverage is low at 20% (only 'speed' has a description). The tool description does not explain the purpose or expected values for 'filepath', 'clip_id', 'preserve_pitch', and 'output_path', which the agent needs to use the tool correctly.

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 ('change') and resource ('clip playback speed'), and it distinguishes itself from sibling tools by specifying the unique function of speed adjustment, which no other sibling tool explicitly does.

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, such as when to use speed adjustment vs. other clip modifications, and lacks exclusions or context for decision-making.

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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