blender_compositor

THE RISK

Low Risk

Why blender_compositor needs a policy

The description is empty and the name alone ('blender_compositor') only suggests it relates to Blender's compositor (node-based post-processing). Without further detail, it could be Read (querying compositor settings), Write (modifying compositor nodes), or Execute (rendering).

From the tool's definition Tool name 'blender_compositor' and empty description provide no detail about what operations are performed.

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

POLICY

How to control blender_compositor

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_compositor:

policy.json

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

blender_compositor 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_compositor

What does the blender_compositor tool do? +

blender_compositor. 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_compositor? +

Register the Blender MCP server in PolicyLayer and add a rule for blender_compositor: 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_compositor? +

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

Can I rate-limit blender_compositor? +

Yes. Add a rate_limit block to the blender_compositor 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_compositor completely? +

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

blender_compositor 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 →