mesh_set_surface_material

Assign a Material (res:// path) to a MeshInstance3D (undoable). Default surface -1 sets

SERVERGodot Breakpoint SOURCEjlivingston-Cipher/godot-breakpoint-mcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/godot-breakpoint-mcp/mesh-set-surface-material.md

WHAT IT DOES

What mesh_set_surface_material does on Godot Breakpoint

AI agents use mesh_set_surface_material to create or update resources in Godot Breakpoint, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Godot Breakpoint environment.

RISK

Why mesh_set_surface_material is rated Medium

This tool modifies existing game object properties (material assignment) without deleting or permanently destroying data. The explicit note that it is "undoable" confirms the action is reversible, placing it in the Write category rather than Destructive.

From the tool's definition Tool description states "Assign a Material (res:// path) to a MeshInstance3D (undoable)". The verb "Assign" combined with "(undoable)" indicates a reversible modification of material properties on a 3D mesh object.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs mesh_set_surface_material safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Godot Breakpoint, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For mesh_set_surface_material, this is the rule to start with:

mesh_set_surface_material Rate-limited

mesh_set_surface_material stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "mesh_set_surface_material": {
      "limits": [
        {
          "counter": "mesh_set_surface_material_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Godot Breakpoint, apply this rule, and every mesh_set_surface_material call is checked against it from then on.

FAQ

Questions about mesh_set_surface_material

What does the mesh_set_surface_material tool do? +

Assign a Material (res:// path) to a MeshInstance3D (undoable). Default surface -1 sets. It is categorised as a Write tool in the Godot Breakpoint MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on mesh_set_surface_material? +

Register the Godot Breakpoint MCP server in PolicyLayer and add a rule for mesh_set_surface_material: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Godot Breakpoint. Nothing to install.

What risk level is mesh_set_surface_material? +

mesh_set_surface_material is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit mesh_set_surface_material? +

Yes. Add a rate_limit block to the mesh_set_surface_material rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block mesh_set_surface_material completely? +

Set action: deny in the PolicyLayer policy for mesh_set_surface_material. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides mesh_set_surface_material? +

mesh_set_surface_material is provided by the Godot Breakpoint MCP server (jlivingston-Cipher/godot-breakpoint-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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