blender_grease_pencil

THE RISK

Low Risk

Why blender_grease_pencil needs a policy

The description is empty and uninformative. The name suggests interaction with Blender's Grease Pencil system, which could involve reading, writing, or executing operations. Given the server context of AI-powered Blender control, it likely writes or modifies Grease Pencil strokes/objects, but without a description, confidence is low. Defaulting to Other with lowered confidence as per rules.

From the tool's definition Tool name 'blender_grease_pencil' and empty description provide no detail on what the tool does beyond referencing Blender's Grease Pencil feature (2D/3D drawing/annotation tool).

Documented attack patterns abuse exactly the kind of access blender_grease_pencil gives an agent:

POLICY

How to control blender_grease_pencil

PolicyLayer is an MCP gateway — it sits between your AI agents and Blender, and nothing reaches the server without passing your rules. This is the rule we recommend for blender_grease_pencil:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "blender_grease_pencil": {
      "limits": [
        {
          "counter": "blender_grease_pencil_rate",
          "window": "minute",
          "max": 60,
          "scope": "grant"
        }
      ]
    }
  }
}

blender_grease_pencil gets a rate cap, and everything else on the server is denied unless you say otherwise.

Create a free account and register Blender — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

SET A RULE FOR THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Tool risk categories → How PolicyLayer classifies MCP tools by what they can do.
MCP tool → What an MCP tool is and how clients discover and call it.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about blender_grease_pencil

What does the blender_grease_pencil tool do? +

blender_grease_pencil. It is categorised as a Other tool in the Blender MCP Server, which means it performs auxiliary operations.

How do I enforce a policy on blender_grease_pencil? +

Register the Blender MCP server in PolicyLayer and add a rule for blender_grease_pencil: 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 Blender. Nothing to install.

What risk level is blender_grease_pencil? +

blender_grease_pencil is a Other tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit blender_grease_pencil? +

Yes. Add a rate_limit block to the blender_grease_pencil 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 blender_grease_pencil completely? +

Set action: deny in the PolicyLayer policy for blender_grease_pencil. 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 blender_grease_pencil? +

blender_grease_pencil is provided by the Blender MCP server (sandraschi/blender-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Blender tool call.

Start from Blender, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →