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Blender Copilot MCP Server

by dwgx

sculpt_brush_stroke

Apply a programmed brush stroke to a mesh for sculpting using bmesh displacement. Choose from various brush types, define stroke points in world space, set strength and radius, and enable symmetry.

Instructions

Execute a programmatic sculpt brush stroke on a mesh.

Uses bmesh vertex displacement for precise, reproducible sculpting that doesn't depend on screen coordinates.

Args: mesh_name: Name of the mesh object. brush_type: Brush to use — DRAW, CLAY_STRIPS, SMOOTH, GRAB, INFLATE, CREASE, FLATTEN, PINCH, SNAKE_HOOK. strength: Brush strength 0.0-1.0. radius: Brush radius in Blender units (world space). stroke_points: JSON array of {"x","y","z"} world-space points defining the stroke path. Each point applies the brush effect. use_symmetry_x: Mirror across X axis (left/right). use_symmetry_y: Mirror across Y axis. use_symmetry_z: Mirror across Z axis.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
radiusNo
strengthNo
mesh_nameYes
brush_typeNoDRAW
stroke_pointsNo[]
use_symmetry_xNo
use_symmetry_yNo
use_symmetry_zNo
Behavior3/5

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

The description discloses the internal method (bmesh vertex displacement) and emphasizes precision and reproducibility, which adds value beyond the lack of annotations. However, it does not mention side effects on mesh attributes or undo behavior.

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 front-loaded with purpose, followed by a brief method note and a clean Google-style argument list. Every sentence serves a purpose with no redundancy.

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?

Given the 8 parameters and no output schema or annotations, the description covers all parameters and the core mechanism. Missing details like undoability or impact on mesh properties, but sufficient for a sculpting tool.

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?

With 0% schema coverage, the description fully compensates by explaining each parameter's type, format (e.g., JSON array for stroke_points), range (strength, radius), and enum values for brush_type, adding critical meaning the schema lacks.

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 clearly states the tool executes a programmatic sculpt brush stroke on a mesh using bmesh vertex displacement, distinguishing it from other sculpt tools that may depend on screen coordinates or have different methods.

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 explicit guidance on when to use this tool versus other sculpt siblings like sculpt_brush_full or sculpt_layer_workflow. The description implies programmatic usage but fails to compare or provide selection criteria.

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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