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MoviePy MCP Server

MoviePy MCP Server

by vive1101011
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Python
Local

attach_audio

Attach an audio clip to a video, either replacing its existing audio or mixing both tracks.

Instructions

Set or mix an audio track onto a video clip.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "video_clip_id": "<video_clip_id>",
      "audio_clip_id": "<audio_clip_id>"
    },
    "name": "attach_audio"
  }
}

Input Schema

NameRequiredDescriptionDefault
audio_clip_idYesThe audio clip to attach.
video_clip_idYesThe video to receive audio.
mix_with_existingNoIf True and the video already has audio, mix both; if False, replace the existing track.

Output Schema

NameRequiredDescriptionDefault

No arguments

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

B3.1/5.0
Behavior2/5

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It only states the basic operation without revealing side effects such as whether existing audio is replaced by default, whether the clip is modified in place, or any permission requirements. The parameter description for mix_with_existing covers some behavior, but the main description is insufficient.

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, focused sentence with no redundant information. It is front-loaded with the action and object, making it easy to scan and efficient.

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

Completeness3/5

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

The tool has an output schema and complete parameter definitions, which reduces the burden on the description. However, the description still lacks side-effect disclosure and usage context. Given the schema richness, the description is minimally adequate but not comprehensive.

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 provides 100% parameter coverage with clear descriptions for each parameter (audio_clip_id, video_clip_id, mix_with_existing). The tool description adds no additional meaning beyond summarizing the action, so the baseline score of 3 is appropriate.

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?

The description clearly identifies the action (set or mix) and the resources (audio track onto video clip), making it easy to understand. However, it does not explicitly differentiate from sibling tools like overlay_clip or set_volume, so it falls short of a 5.

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. It does not mention prerequisites, exclusions, or cases where another sibling (e.g., remove_audio) would be more appropriate.

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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