add_to_collection

Add an object to a collection.

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/add-to-collection.md

WHAT IT DOES

What add_to_collection does on Blender

AI agents use add_to_collection 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 add_to_collection is rated Medium

Adding an object to a collection modifies scene structure but is fully reversible (the object can be removed from the collection). It does not execute external code, delete data, or have financial consequences. This is a standard Write operation that creates or modifies data in a reversible manner.

From the tool's definition Tool performs 'Add an object to a collection' which creates a new organizational relationship in Blender's scene hierarchy. This is a reversible modification operation that does not delete, execute arbitrary code, or cause financial impact.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs add_to_collection 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 add_to_collection, this is the rule to start with:

add_to_collection Rate-limited

add_to_collection 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": {
    "add_to_collection": {
      "limits": [
        {
          "counter": "add_to_collection_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 add_to_collection call is checked against it from then on.

FAQ

Questions about add_to_collection

What does the add_to_collection tool do? +

Add an object to a collection. 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 add_to_collection? +

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

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

Can I rate-limit add_to_collection? +

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

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

add_to_collection 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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