Blockbench Modeling
Create and edit 3D models in Blockbench using MCP tools. Use when building geometry with cubes, creating meshes, placing spheres/cylinders, editing vertices, extruding faces, or organizing models with groups. Covers both cube-based Minecraft modeling and freeform mesh editing.
Specification
- Skill ID
- jasonjgardner/blockbench-mcp-project/blockbench-modeling
- Publisher
- jasonjgardner
- Repository
- blockbench-mcp-project
- Installs
- 0
- Files
- 1
- Synced
- Sep 23, 2026
How to use it
Open any RiverX project, open the Skills panel in the chat, and search for this identifier. The files are fetched from the source repository at install time.
jasonjgardner/blockbench-mcp-project/blockbench-modelingInstalls these files- SKILL.md
What this skill tells the agent
Blockbench Modeling
Build 3D models using cubes and meshes in Blockbench.
Available Tools
Cube Tools
| Tool | Purpose |
|---|---|
place_cube | Create cubes with position, size, texture |
modify_cube | Edit cube properties (position, rotation, UV, etc.) |
Mesh Tools
| Tool | Purpose |
|---|---|
place_mesh | Create mesh with vertices |
create_sphere | Create sphere mesh |
create_cylinder | Create cylinder mesh |
extrude_mesh | Extrude faces/edges/vertices |
subdivide_mesh | Add geometry detail |
select_mesh_elements | Select vertices/edges/faces |
move_mesh_vertices | Move selected vertices |
delete_mesh_elements | Remove geometry |
merge_mesh_vertices | Weld nearby vertices |
create_mesh_face | Create face from vertices |
knife_tool | Cut edges into faces |
Element Tools
| Tool | Purpose |
|---|---|
add_group | Create bone/group |
list_outline | View model hierarchy |
duplicate_element | Copy elements |
rename_element | Rename elements |
remove_element | Delete elements |
Cube Modeling
Place a Cube
place_cube: elements=[{
name: "body",
from: [-4, 0, -2],
to: [4, 12, 2]
}], faces=true # Auto UVPlace Multiple Cubes
place_cube: elements=[
{name: "head", from: [-4, 12, -4], to: [4, 20, 4]},
{name: "arm_left", from: [4, 4, -1], to: [6, 12, 1]},
{name: "arm_right", from: [-6, 4, -1], to: [-4, 12, 1]}
], group="body"Modify Cube
modify_cube: id="body", rotation=[0, 45, 0], origin=[0, 6, 0]Cube with Texture
place_cube: elements=[{name: "block", from: [0,0,0], to: [16,16,16]}],
texture="stone", faces=trueMesh Modeling
Create Sphere
create_sphere: elements=[{
name: "ball",
position: [0, 8, 0],
diameter: 16,
sides: 12
}]Create Cylinder
create_cylinder: elements=[{
name: "pillar",
position: [0, 0, 0],
diameter: 8,
height: 24,
sides: 12,
capped: true
}]Extrude Face
select_mesh_elements: mesh_id="pillar", mode="face", elements=["top_face"]
extrude_mesh: mesh_id="pillar", mode="faces", distance=4Subdivide for Detail
subdivide_mesh: mesh_id="sphere", cuts=2Move Vertices
select_mesh_elements: mesh_id="mesh1", mode="vertex", elements=["v1", "v2"]
move_mesh_vertices: offset=[0, 2, 0]Merge Close Vertices
merge_mesh_vertices: mesh_id="mesh1", threshold=0.1Knife Cut
knife_tool: mesh_id="cube_mesh", points=[
{position: [0, 8, -4]},
{position: [0, 8, 4]}
]Organization
Create Group Hierarchy
add_group: name="root", origin=[0, 0, 0], rotation=[0, 0, 0]
add_group: name="body", parent="root", origin=[0, 12, 0]
add_group: name="head", parent="body", origin=[0, 24, 0]Add Cubes to Groups
place_cube: elements=[{name: "torso", from: [-4, 12, -2], to: [4, 24, 2]}],
group="body"Duplicate Element
duplicate_element: id="arm_left", newName="arm_right", offset=[-8, 0, 0]View Hierarchy
list_outline # Returns all groups and elementsCommon Patterns
Minecraft Character
# Create hierarchy
add_group: name="root", origin=[0, 0, 0]
add_group: name="body", parent="root", origin=[0, 24, 0]
add_group: name="head", parent="body", origin=[0, 24, 0]
add_group: name="arm_left", parent="body", origin=[5, 22, 0]
add_group: name="arm_right", parent="body", origin=[-5, 22, 0]
add_group: name="leg_left", parent="root", origin=[2, 12, 0]
add_group: name="leg_right", parent="root", origin=[-2, 12, 0]
# Add geometry
place_cube: elements=[{name: "head", from: [-4, 24, -4], to: [4, 32, 4]}], group="head"
place_cube: elements=[{name: "body", from: [-4, 12, -2], to: [4, 24, 2]}], group="body"
place_cube: elements=[{name: "arm", from: [-1, 0, -1], to: [1, 10, 1]}], group="arm_left"
place_cube: elements=[{name: "arm", from: [-1, 0, -1], to: [1, 10, 1]}], group="arm_right"
place_cube: elements=[{name: "leg", from: [-2, 0, -2], to: [2, 12, 2]}], group="leg_left"
place_cube: elements=[{name: "leg", from: [-2, 0, -2], to: [2, 12, 2]}], group="leg_right"Smooth Organic Shape
create_sphere: elements=[{name: "base", position: [0, 8, 0], diameter: 16, sides: 16}]
subdivide_mesh: mesh_id="base", cuts=1
# Select and move vertices to shape
select_mesh_elements: mesh_id="base", mode="vertex"
move_mesh_vertices: offset=[0, 4, 0], vertices=["top_verts"]Tips
- Use
list_outlineto see current model structure - Set group origins at joint/pivot points for animation
- Use
faces=truefor auto UV mapping on cubes - Create bone hierarchy before adding geometry
- Use
duplicate_elementwith offset for symmetrical parts - Mesh editing is more flexible but cubes are simpler for Minecraft-style models
More from jasonjgardner
Use this skill in a project
Open any RiverX project, search the Skills panel for jasonjgardner/blockbench-mcp-project/blockbench-modeling, and install it in one click.
