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Blender MCP Ultra

Blender MCP Ultra

by 3bdull4h2008
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Python
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add_particle_system

Create and configure a particle system on a target object, setting type, count, lifetime, and frame range for realistic effects.

Instructions

Add a particle system to an object.

Args: object_name: Target object. particle_type: EMITTER, HAIR, or STATIC_HAIR. count: Number of particles. lifetime: Particle lifetime in frames. frame_start: Start frame. frame_end: End frame.

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": {
      "object_name": "<object_name>"
    },
    "name": "add_particle_system"
  }
}

Input Schema

NameRequiredDescriptionDefault
countNo
lifetimeNo
frame_endNo
frame_startNo
object_nameYes
particle_typeNoEMITTER

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv3.0.0

TDQS

B3.1/5.0
Behavior2/5

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It does not mention side effects, whether existing particle systems are replaced or appended, object type requirements, or any limitations beyond the operation itself.

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 short, front-loaded with the main purpose, and uses a clean argument list with no filler. Every sentence and 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, the description still lacks important contextual details such as expected behavior on failure, whether multiple particle systems can be added to the same object, and what success looks like. Parameter semantics are covered, but broader call context is incomplete.

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

Parameters4/5

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

Schema description coverage is 0%, so the description must add parameter meaning, and it does: it explains 'particle_type' options, specifies frames for lifetime and frame range, and identifies the target object. This is helpful, though each parameter's explanation is brief and mostly restates the parameter name.

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 states a specific action and resource: 'Add a particle system to an object.' This clearly identifies the tool's core function, but it does not differentiate it from the sibling tool 'create_particle_field', so it does not fully earn 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?

There is no guidance about when to use this tool versus alternatives, no prerequisites, and no exclusion criteria. The description only states what the tool does, leaving the agent to infer appropriate usage.

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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