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Arkeonix CapCut MCP

Arkeonix CapCut MCP

by daviilpzDev
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capcut_sync_to_beats

Align CapCut timeline cuts or zoom pulses to music beat timestamps. Provide beat markers and choose accent_cut or accent_zoom to sync edits precisely.

Instructions

Synchronize timeline edits (cuts or punchy zoom pulses) to music beat markers.

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": {
      "draft": "<draft>",
      "beatTimestamps": "<beatTimestamps>"
    },
    "name": "capcut_sync_to_beats"
  }
}

Input Schema

NameRequiredDescriptionDefault
draftYes
actionNoaction on beat (default: "accent_zoom")
zoomScaleNoscale factor for zoom pulse (default: 1.08)
beatTimestampsYeslist of musical beat timestamps in seconds

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

B3.4/5.0
Behavior2/5

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

There are no annotations, so the description carries the full burden of behavioral disclosure. It mentions what the tool does on a high level but does not reveal whether the operation is destructive, whether it modifies existing cuts/zooms, how it affects the draft, or what the resulting timeline state looks like.

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 sentence with no filler, and it front-loads the core operation before specifying the relevant edit types. Every phrase earns its place.

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?

With no annotations and no output schema, a richer description is needed. The current text explains the basic action but omits side effects, preconditions, return value, and failure behavior, which is important for a timeline-mutating tool.

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 description coverage is 75%, so the schema covers most parameters. The description adds semantic meaning by linking 'cuts' to the action enum and 'punchy zoom pulses' to zoomScale, and 'beat markers' to beatTimestamps. However, it does not clarify the purpose of the 'draft' parameter, which remains undocumented in 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?

The description uses a specific action verb ('Synchronize'), identifies the resource ('timeline edits'), and clarifies the exact modalities ('cuts or punchy zoom pulses') and the target ('music beat markers'). This clearly differentiates it from sibling tools like align_linked_segments or auto_jumpcut.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description implies when to use the tool: when the user wants timeline edits aligned to musical beats. However, it provides no explicit guidance on when not to use it or how it compares to similar automated editing tools such as capcut_auto_jumpcut or capcut_auto_duck_bgm.

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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