reduce_vertex_valence · Blender MCP: Risk & Policy

WHAT IT DOES

What reduce_vertex_valence does on BlenderMCP

AI agents invoke reduce_vertex_valence to trigger actions in BlenderMCP. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why reduce_vertex_valence needs a policy

The tool name suggests it modifies vertex topology in a 3D mesh (reducing the number of edges connected to a vertex), which would be a write/execute operation within Blender. However, the description is empty, so confidence is low. Given the server's context of executing Python scripts and manipulating Blender objects, this is most likely an Execute-level operation that runs geometry processing operations.

From the tool's definition Tool name 'reduce_vertex_valence' and empty description. Server context involves Blender manipulation and Python script execution.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

reduce_vertex_valence Rate-limited

reduce_vertex_valence stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "reduce_vertex_valence": {
      "limits": [
        {
          "counter": "reduce_vertex_valence_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches BlenderMCP, so you can run agents against it safely.

FAQ

Questions about reduce_vertex_valence

What does the reduce_vertex_valence tool do? +

reduce_vertex_valence. It is categorised as a Execute tool in the BlenderMCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on reduce_vertex_valence? +

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

What risk level is reduce_vertex_valence? +

reduce_vertex_valence is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit reduce_vertex_valence? +

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

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

reduce_vertex_valence is provided by the Blender MCP server (shirshovdim/retopoflow_blender_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.