select_by_criteria · Blender MCP: Risk & Policy

WHAT IT DOES

What select_by_criteria does on BlenderMCP

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

WHY IT NEEDS A POLICY

Why select_by_criteria needs a policy

With no description available, classification is based solely on the tool name. 'Select by criteria' in Blender context typically modifies the selection state of objects/elements in the scene, which is a reversible write-like operation (changing selection state). It does not appear to delete, execute code, or involve financial transactions. Confidence is low due to the empty description.

From the tool's definition Tool name 'select_by_criteria' and empty description. Name suggests selecting objects based on criteria within Blender.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

select_by_criteria Rate-limited

select_by_criteria 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": {
    "select_by_criteria": {
      "limits": [
        {
          "counter": "select_by_criteria_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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 select_by_criteria

What does the select_by_criteria tool do? +

select_by_criteria. It is categorised as a Write tool in the BlenderMCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on select_by_criteria? +

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

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

Can I rate-limit select_by_criteria? +

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

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

select_by_criteria 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.