// SCAN REPORT

Open Brush MCP Server

52 tools. 48 can modify or destroy data without limits.

3 destructive tools with no built-in limits. Policy required.

Last updated: 4 Jul 2026

48 can modify or destroy data

4 read-only

52 tools total

Community server · catalogue entry verified 04/07/2026

How to control Open Brush MCP Server ↓

TOOL MAP

What Open Brush MCP Server exposes to your agents

Read (4) Write / Execute (45) Destructive / Financial (3)

Running more than one server? Check your whole stack →

MOST DANGEROUS TOOLS

Critical Risk

The most dangerous Open Brush MCP Server tools

Destructive · High model_delete The tool permanently removes a 3D model from the Open Brush project. Destructive · Medium selection_delete The tool performs an irreversible delete operation on selected content within Open Brush. Destructive · High save_overwrite Overwriting a save file is an irreversible operation: once the previous save is replaced, it cannot be recovered. Execute · Medium model_scale This tool executes a transformation command in Open Brush that changes the visual/geometric state of a 3D model.

48 of Open Brush MCP Server's 52 tools can modify, destroy, or commit something on every call — and an agent calls them with no built-in limits.

POLICY

How to control Open Brush MCP Server

PolicyLayer is an MCP gateway — it sits between your AI agents and Open Brush MCP Server, and nothing reaches the server without passing your rules. These are the rules we recommend:

Deny destructive operations

{
  "model_delete": {
    "deny_if": [
      {
        "conditions": [],
        "on_deny": "Blocked by default. Requires approval."
      }
    ]
  }
}

Destructive tools should never be available to autonomous agents without human approval.

Rate limit write operations

{
  "brush_add_size": {
    "limits": [
      {
        "counter": "brush_add_size_per_hour",
        "window": "hour",
        "max": 30,
        "scope": "grant"
      }
    ]
  }
}

Prevents bulk unintended modifications from agents caught in loops.

Cap read operations

{
  "brush_translate": {
    "limits": [
      {
        "counter": "brush_translate_per_minute",
        "window": "minute",
        "max": 60,
        "scope": "grant"
      }
    ]
  }
}

Controls API costs and prevents retry loops from exhausting upstream rate limits.

Create a free account and register Open Brush MCP Server — nothing to install.
Add these rules — paste them, or build them visually. Tune the limits to your setup.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

ENFORCE POLICY ON OPEN BRUSH →

Instant setup, no code required.

FULL CATALOGUE

All 52 Open Brush MCP Server tools

DESTRUCTIVE 3 tools

Destructive model_delete Deletes a 3D model by index Destructive save_overwrite Saves the scene by overwriting the last save Destructive selection_delete Deletes current selection

EXECUTE 9 tools

Execute brush_draw Draws a straight line of specified length Execute brush_turn Turns brush relatively Execute camera_translate Moves camera relatively Execute camera_turn Turns camera relatively Execute draw_path Draws a path at the current brush position using comma-separated XYZ triplets (e.g. [0,0,0],[0,1,0]), not an S Execute draw_paths Draws a series of paths at the current brush position Execute draw_polygon Draws a polygon at the current brush position Execute model_scale Sets a 3D model's scale Execute new_scene Creates a new empty scene

WRITE 36 tools

Write brush_add_size Modifies brush size by an amount Write brush_move Moves brush to absolute position Write brush_set_path_smoothing Sets brush path smoothing (0-1, default 0.1) Write brush_set_size Sets brush size Write brush_set_type Change brush type Write camera_move Moves camera to absolute position Write camera_rotate Sets camera rotation Write color_add_hsv Adds values to current color (HSV) Write color_add_rgb Adds values to current color (RGB) Write color_set_hsv Sets color in HSV (0-1) Write color_set_html Sets color with HTML/CSS value Write color_set_rgb Sets color in RGB (0-1) Write draw_stroke Draws an exact stroke with orientation and pressure Write guide_add Adds a guide to the scene Write guide_position Moves a guide to given coordinates Write guide_scale Sets non-uniform scale of a guide Write layer_create Creates a new layer Write layer_hide Hides a layer Write layer_set Sets active layer Write layer_show Shows a layer Write model_icosa_import Imports a model from Icosa Gallery Write model_import Imports a 3D model from Media Library/Models Write model_position Moves a 3D model to given coordinates Write model_rotation Sets a 3D model's rotation Write model_select Selects a 3D model by index Write model_web_import Imports a 3D model from URL or local file Write redo Redoes last undone action Write save_as Saves the scene with a new name Write save_new Saves the scene in a new slot Write selection_duplicate Duplicates current selection Write selection_invert Inverts selection Write selection_select_all Selects all strokes Write spectator_move Moves spectator camera Write symmetry_mode Sets symmetry mode Write symmetry_position Moves symmetry widget Write undo Undoes last action

READ 4 tools

Read brush_translate Moves brush relatively Read load_named Loads a sketch by name from user folder Read load_user Loads a sketch from user folder by index Read show_help Shows API help

EXPLORE

Related servers

Other MCP servers with similar tools — same risk classification, starter policies for each.

FAQ

Questions about Open Brush MCP Server

Can an AI agent delete data through the Open Brush MCP Server MCP server? +

Yes. The Open Brush MCP Server server exposes 3 destructive tools including model_delete, save_overwrite, selection_delete. These permanently remove resources with no undo. PolicyLayer blocks destructive tools by default so they never reach the upstream server.

How do I prevent bulk modifications through Open Brush MCP Server? +

The Open Brush MCP Server server has 36 write tools including brush_add_size, brush_move, brush_set_path_smoothing. Set a rate limit in your policy -- for example, 10 calls per hour prevents an agent from making more than 10 modifications per hour. PolicyLayer enforces this at the gateway, before calls reach Open Brush MCP Server.

How many tools does the Open Brush MCP Server MCP server expose? +

52 tools across 4 categories: Destructive, Execute, Read, Write. 4 are read-only. 48 can modify, create, or delete data.

How do I enforce a policy on Open Brush MCP Server? +

Register the Open Brush MCP Server MCP server in PolicyLayer, apply the suggested rules above (adjust the limits to your use case), and point your AI client at the PolicyLayer proxy URL instead of the server directly. Your agents keep the same tools; PolicyLayer evaluates every call against policy before it executes. Nothing to install, live in minutes.

Enforce policy on every Open Brush MCP Server tool call.

Deterministic rules across all 52 Open Brush MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.

ENFORCE POLICY ON OPEN BRUSH →

Instant setup, no code required.

52 Open Brush MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.