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blender_materials

Manage PBR materials in Blender: create fabric, metal, wood, glass, ceramic; assign to objects; or use presets.

Instructions

Create and manage PBR materials in Blender.

Supports multiple operations through the operation parameter:

  • create_fabric: Create fabric material (velvet, silk, cotton, linen, etc.)

  • create_metal: Create metal material (gold, silver, brass, copper, etc.)

  • create_wood: Create wood material (oak, pine, mahogany, walnut, etc.)

  • create_glass: Create glass material (clear, tinted, frosted, stained)

  • create_ceramic: Create ceramic material (porcelain, ceramic, terra_cotta)

  • assign_to_object: Assign existing material to object

  • create_from_preset: Create material from predefined preset

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
operationNoMaterial operation typecreate_fabric
nameNoName for the new materialMaterial
fabric_typeNoType of fabric (velvet, silk, cotton, linen, brocade, satin, wool)velvet
velvet_softnessNoSoftness for velvet materials (0-1)
silk_sheenNoSheen intensity for silk materials (0-1)
weave_scaleNoScale of weave pattern (0.1-10.0)
sub_surfaceNoSubsurface scattering amount (0-1)
normal_strengthNoNormal map intensity (0-1)
metal_typeNoType of metal (gold, silver, brass, copper, iron, aluminum)gold
metallicNoMetallic property (0-1)
anisotropyNoSurface anisotropy for brushed effects (0-1)
wood_typeNoType of wood (oak, pine, mahogany, walnut, cherry, beech)oak
grain_scaleNoScale of wood grain pattern (0.1-5.0)
glass_typeNoType of glass (clear, tinted, frosted, stained)clear
transmissionNoLight transmission amount (0-1)
iorNoIndex of refraction (1.0-2.5)
ceramic_typeNoType of ceramic (porcelain, ceramic, terra_cotta)porcelain
glossinessNoSurface glossiness (0-1)
base_colorNoBase color as RGB values (0-1)
roughnessNoSurface roughness (0-1)
object_nameNoName of object for assignment
material_nameNoName of material for assignment
preset_nameNoName of material preset to use

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior2/5

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

No annotations are provided, so the description must disclose behavioral traits. It describes operations but does not mention side effects (e.g., modifying existing materials), error conditions, or whether operations are idempotent. The lack of behavioral context leaves the agent uncertain.

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 extremely concise: two sentences plus a bullet list. It is front-loaded with the core purpose, and each line adds distinct value. No unnecessary words.

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 23 parameters and multiple operations, yet the description only lists them without details on interactions, return values, or constraints. While an output schema exists, the description could still better contextualize the complexity. Adequate but not thorough.

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 100%, so baseline is 3. The description does not add parameter-specific details beyond the schema; it only groups operations. It meets the baseline but does not exceed it.

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 it creates and manages PBR materials in Blender, listing seven specific operations. While it doesn't explicitly differentiate from sibling tools like blender_materials_baking or blender_textures, the focus on material creation and assignment is unambiguous.

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 lists operations but provides no guidance on when to use this tool versus alternatives, nor any prerequisites or conditions for using specific operations. For example, assign_to_object implies an existing object, but no such hint is given.

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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