set_active_scene

Set the active scene by name.

SERVERBlender SOURCEsandraschi/blender-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/sandraschi-blender-mcp/set-active-scene.md

WHAT IT DOES

What set_active_scene does on Blender

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

RISK

Why set_active_scene is rated Medium

This tool modifies Blender's state by changing which scene is currently active. It's a reversible write operation (you can switch back to another scene), but misuse by an AI agent could cause confusion or unintended context switches in an ongoing 3D project.

From the tool's definition Set the active scene by name

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs set_active_scene safely

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

set_active_scene Rate-limited

set_active_scene 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": {
    "set_active_scene": {
      "limits": [
        {
          "counter": "set_active_scene_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 Blender, apply this rule, and every set_active_scene call is checked against it from then on.

FAQ

Questions about set_active_scene

What does the set_active_scene tool do? +

Set the active scene by name. It is categorised as a Write tool in the Blender MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on set_active_scene? +

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

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

Can I rate-limit set_active_scene? +

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

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

set_active_scene 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.

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