ReddRadar
Agent skill
blender-mcp
Control Blender directly from Hermes via socket connection to the blender-mcp addon. Create 3D objects, materials, animations, and run arbitrary Blender Python (bpy) code. Use when user wants to create or modify anything in Blender.
Install this agent skill to your Project
npx add-skill https://github.com/NousResearch/hermes-agent/tree/main/optional-skills/creative/blender-mcp
SKILL.md
Blender MCP
Control a running Blender instance from Hermes via socket on TCP port 9876.
Setup (one-time)
1. Install the Blender addon
curl -sL https://raw.githubusercontent.com/ahujasid/blender-mcp/main/addon.py -o ~/Desktop/blender_mcp_addon.py
In Blender: Edit > Preferences > Add-ons > Install > select blender_mcp_addon.py Enable "Interface: Blender MCP"
2. Start the socket server in Blender
Press N in Blender viewport to open sidebar. Find "BlenderMCP" tab and click "Start Server".
3. Verify connection
nc -z -w2 localhost 9876 && echo "OPEN" || echo "CLOSED"
Protocol
Plain UTF-8 JSON over TCP -- no length prefix.
Send: {"type": "", "params": {}} Receive: {"status": "success", "result": } {"status": "error", "message": ""}
Available Commands
| type | params | description |
|---|---|---|
| execute_code | code (str) | Run arbitrary bpy Python code |
| get_scene_info | (none) | List all objects in scene |
| get_object_info | object_name (str) | Details on a specific object |
| get_viewport_screenshot | (none) | Screenshot of current viewport |
Python Helper
Use this inside execute_code tool calls:
import socket, json
def blender_exec(code: str, host="localhost", port=9876, timeout=15):
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((host, port))
s.settimeout(timeout)
payload = json.dumps({"type": "execute_code", "params": {"code": code}})
s.sendall(payload.encode("utf-8"))
buf = b""
while True:
try:
chunk = s.recv(4096)
if not chunk:
break
buf += chunk
try:
json.loads(buf.decode("utf-8"))
break
except json.JSONDecodeError:
continue
except socket.timeout:
break
s.close()
return json.loads(buf.decode("utf-8"))
Common bpy Patterns
Clear scene
bpy.ops.object.select_all(action='SELECT')
bpy.ops.object.delete()
Add mesh objects
bpy.ops.mesh.primitive_uv_sphere_add(radius=1, location=(0, 0, 0))
bpy.ops.mesh.primitive_cube_add(size=2, location=(3, 0, 0))
bpy.ops.mesh.primitive_cylinder_add(radius=0.5, depth=2, location=(-3, 0, 0))
Create and assign material
mat = bpy.data.materials.new(name="MyMat")
mat.use_nodes = True
bsdf = mat.node_tree.nodes.get("Principled BSDF")
bsdf.inputs["Base Color"].default_value = (R, G, B, 1.0)
bsdf.inputs["Roughness"].default_value = 0.3
bsdf.inputs["Metallic"].default_value = 0.0
obj.data.materials.append(mat)
Keyframe animation
obj.location = (0, 0, 0)
obj.keyframe_insert(data_path="location", frame=1)
obj.location = (0, 0, 3)
obj.keyframe_insert(data_path="location", frame=60)
Render to file
bpy.context.scene.render.filepath = "/tmp/render.png"
bpy.context.scene.render.engine = 'CYCLES'
bpy.ops.render.render(write_still=True)
Pitfalls
- Must check socket is open before running (nc -z localhost 9876)
- Addon server must be started inside Blender each session (N-panel > BlenderMCP > Connect)
- Break complex scenes into multiple smaller execute_code calls to avoid timeouts
- Render output path must be absolute (/tmp/...) not relative
- shade_smooth() requires object to be selected and in object mode
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