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blender-mcp

blender-mcp

by Vertiiii
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Python
Local

set_texture

Apply a downloaded Polyhaven texture to an object by specifying the object name and texture ID.

Instructions

Apply a previously downloaded Polyhaven texture to an object.

Parameters:

  • object_name: Name of the object to apply the texture to

  • texture_id: ID of the Polyhaven texture to apply (must be downloaded first)

Returns a message indicating success or failure.

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>",
      "texture_id": "<texture_id>"
    },
    "name": "set_texture"
  }
}

Input Schema

NameRequiredDescriptionDefault
texture_idYes
object_nameYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

A4.3/5.0
Behavior3/5

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

With no annotations, the description must carry the behavioral burden. It discloses the prerequisite of a prior download and states that the tool returns a success/failure message. However, it does not explain what happens on failure, whether existing textures are replaced, or whether the object must exist, leaving moderate behavioral gaps.

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 compact, front-loaded with the main purpose, and structured cleanly into purpose, parameters, and return behavior. There is no filler or redundant content beyond what is needed given the 0% schema coverage.

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

Completeness4/5

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

For a simple two-string-parameter tool, the description covers the essential inputs, the prerequisite, and the return behavior. It could be slightly more complete by noting that the object must exist or that the operation may overwrite the object's current texture, but the core invocation context is present.

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

Parameters5/5

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

Schema description coverage is 0%, so the description must fully define the parameters. It does exactly that: object_name is the target object and texture_id is the already-downloaded Polyhaven texture ID. This adds the necessary meaning that the bare schema property names omit.

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 starts with a specific verb-plus-resource statement: 'Apply a previously downloaded Polyhaven texture to an object.' The 'previously downloaded' qualifier clearly distinguishes this from the sibling download_polyhaven_asset and makes the scope of the tool immediately clear.

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

Usage Guidelines4/5

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

The description gives a clear usage condition: the texture 'must be downloaded first.' This implies the correct sequence with download_polyhaven_asset, but it does not explicitly name that sibling or state when not to use this tool, so it falls just short of full alternative routing guidance.

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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