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Aseprite MCP Tools

Aseprite MCP Tools

by NosytLabs
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Python
Local

set_onion_skin

Configure onion skin settings to view past and future frames as overlays for animation assistance. Adjust opacity and number of frames displayed.

Instructions

Configure onion skin settings for Aseprite.

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": {
      "filename": "<filename>"
    },
    "name": "set_onion_skin"
  }
}

Input Schema

NameRequiredDescriptionDefault
afterNo
beforeNo
enabledNo
opacityNo
filenameYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

C2.4/5.0
Behavior2/5

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

With no annotations, the description bears full burden but only says 'Configure onion skin settings,' which omits behavioral details like whether it modifies live settings or requires a sprite to be open. No side effects or prerequisites are mentioned.

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 sentence, which is concise, but it underspecifies the tool's function given the number of parameters. It could be restructured to include key parameter details without being verbose.

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 5 parameters, no output schema, no annotations, and 0% schema coverage, the description is highly incomplete. It does not explain the return value, effect on the sprite, or any related concepts, making it insufficient for reliable tool selection and invocation.

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?

Schema description coverage is 0%, and the description adds no meaning beyond the parameter names from the schema. It does not explain what 'after', 'before', 'opacity' etc. do, leaving the agent without semantic guidance.

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 states the tool configures onion skin settings for Aseprite, using a specific verb and resource. It is distinct from sibling tools that deal with other settings.

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 is provided on when to use this tool versus alternatives like 'render_onion_skin' or other configuration tools. The context of onion skin settings is not explained.

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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