Blender MCP Server

Connect AI assistants like Claude, Codex, and Gemini to Blender.

What is This?

An MCP server that lets AI inspect your Blender scene, model, rig, animate, weight-paint, UV-unwrap, render, and export — all driven by ~270 direct-dispatch tools (no per-call Python compilation overhead). Forced auto-update keeps every machine on the same version.

Setup

1. Install the plugin + server

Windows — PowerShell:

iwr https://raw.githubusercontent.com/6xvl/blender-mcp/main/install.ps1 | iex

macOS / Linux — Bash:

curl -fsSL https://raw.githubusercontent.com/6xvl/blender-mcp/main/install.sh | bash

The installer drops the addon into Blender's addons folder, installs uv, runs uv tool install blender-mcp, and patches the installed server.py with this fork's expanded toolset.

2. Activate in Blender

• Edit → Preferences → Add-ons → search "Blender MCP" → tick it.
• Press N in the 3D viewport → BlenderMCP tab → Connect to Claude.

Status flips to "Running on port 9876". Blender side is done.

3. Connect your AI

Claude Code:

claude mcp add blender-mcp -- blender-mcp

Codex CLI:

codex mcp add blender-mcp -- blender-mcp

Gemini CLI:

gemini mcp add blender-mcp blender-mcp --trust

Verify by asking the assistant to call bm_ping. Expected response: {"ok": true, "scene": "Scene", "frame": 0}.

{
  "mcpServers": {
    "blender-mcp": {
      "command": "blender-mcp",
      "args": [],
      "env": {}
    }
  }
}

# 1. Install uv if missing
curl -LsSf https://astral.sh/uv/install.sh | sh        # macOS / Linux
iwr https://astral.sh/uv/install.ps1 | iex             # Windows PowerShell

# 2. Install the MCP server
uv tool install blender-mcp

# 3. Patch server.py with this fork's expanded toolset
#    Find the install dir:
uv tool dir
#    Then overwrite the file at: <UV_TOOL_DIR>/blender-mcp/lib/python*/site-packages/blender_mcp/server.py
curl -fsSL https://raw.githubusercontent.com/6xvl/blender-mcp/main/server/server.py \
  -o "<that-path>"

# 4. Drop the addon into Blender's addons folder
#    Win:   %APPDATA%\Blender Foundation\Blender\<ver>\scripts\addons\
#    mac:   ~/Library/Application Support/Blender/<ver>/scripts/addons/
#    linux: ~/.config/blender/<ver>/scripts/addons/
curl -fsSL https://raw.githubusercontent.com/6xvl/blender-mcp/main/addon/blender_mcp_addon.py \
  -o "<addons-dir>/blender_mcp_addon.py"

{
  "mcpServers": {
    "blender-mcp": {
      "command": "C:\\Users\\YOU\\.local\\bin\\blender-mcp.exe",
      "args": []
    }
  }
}

What Can You Do?

Ask things like: "List every armature and its bones", "Bend the elbow 90° on Forearm_R at frame 30", "Apply a 45° diagonal cut to Right_Arm and split weights between Bicep_R and Forearm_R", "Render the camera view at frame 20 to disk", "Export the rig and all animations as FBX for Roblox", "Label each side of this mesh with Top/Bottom/Front/Back/Left/Right textures".

Tool categories

| Category | Examples | |---|---| | Inspect | bm_list, bm_ping, bm_read_console, bm_inspect_modifier, bm_inspect_animation, bm_count_vgroup_weights | | Transform | bm_set_transform, bm_apply_transforms, bm_set_origin, bm_translate, bm_rotate, bm_scale | | Mesh edit | bm_rotate_verts, bm_translate_verts, bm_mirror_verts, bm_pca_align, bm_mesh_separate, bm_bisect_plane, bm_subdivide | | Rig + skin | bm_add_armature, bm_auto_weights, bm_smooth_weights, bm_weight_by_axis_split, bm_weight_by_plane_split, bm_paint_weight_to_bone | | Animate | bm_keyframe_bone, bm_keyframe_object, bm_set_frame, bm_push_to_nla, bm_keyframe_material_emission | | Materials / UV | bm_create_material, bm_label_faces_by_side, bm_color_faces_by_side, bm_uv_unwrap, bm_resize_texture | | Modifiers | bm_add_modifier, bm_apply_modifier, bm_add_armature_modifier, bm_add_softbody, bm_add_cloth, bm_add_fluid | | Export | bm_export_fbx, bm_export_format (OBJ/GLB/GLTF/DAE) | | Maintenance | bm_force_mode_set, bm_reload_addon |

Full tool catalog with signatures + docstrings: docs/tools_blender_mcp.md (auto-generated from server.py). Once connected, call bm_list for scene objects and ask your assistant for tool details.

Forced Auto-Update

Every Blender startup, the addon reads VERSION from this repo's main branch via raw URL. If different from local, both blender_mcp_addon.py and server.py are atomically replaced. No opt-out by default. Restart Blender to load the new code.

To disable on a machine:

# top of blender_mcp_addon.py
_BM_AUTOUPDATE_REPO = ""   # empty disables the probe

To publish an update from a fork:

# edit addon/blender_mcp_addon.py or server/server.py
echo "1.0.1" > VERSION
git add -A && git commit -m "feat: …" && git push
# next Blender startup on any installed machine pulls the new files

Troubleshooting

| Symptom | Fix | |---|---| | bm_ping returns "Could not connect to Blender" | N panel → BlenderMCP → Connect to Claude. Then /mcp reconnect on the client side. | | Tool returns {"error": "timeout", …} | A bpy op is blocking the main thread. Run bm_force_mode_set OBJECT and retry. If persistent, toggle the addon off+on. | | Tab missing in N panel | Window → Toggle System Console for tracebacks. Reload Scripts (F3 → "Reload Scripts"). | | bm_set_mode errors with "context is incorrect" | Use bm_force_mode_set — it overrides the VIEW_3D context. | | Auto-update didn't run | Network issue, _BM_AUTOUPDATE_REPO was emptied, or local VERSION already matches. Check bm_read_console mode=summary for autoupdate log lines. |

Local Development

D:\Projects\BlenderMCP\
├── addon\blender_mcp_addon.py    # Blender side (handlers + console tee + autoupdate)
├── server\server.py              # MCP server side (276 @mcp.tool)
├── sync.ps1                      # push source → live install paths + wipe pycache
├── install.ps1 / install.sh      # public one-shot installers
├── textures\sides\               # T/B/F/K/L/R label PNGs for bm_label_faces_by_side
├── VERSION                       # auto-update probe target
├── LICENSE
└── README.md

Workflow:

# 1. Edit either source file
# 2. Push to all live install paths + clear pycache
.\sync.ps1
# 3. Call the hot-reload MCP tool from your client — no UI toggle needed
bm_reload_addon
# 4. /mcp reconnect (socket restart)

Report Issues | MIT Licensed