add_component · MCP For Unity MCP: Risk & Policy

WHAT IT DOES

What add_component does on MCP For Unity

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

WHY IT NEEDS A POLICY

Why add_component needs a policy

This tool creates or modifies GameObjects by attaching components (e.g., Rigidbody, BoxCollider), which is a reversible change to project data. It does not execute arbitrary code, delete irreversibly, or move money. The severity is medium because misuse could corrupt a game's structure or add unintended physics/collision behavior, but changes are recoverable via undo or deletion of the component.

From the tool's definition Tool description states 'Adds a component to a GameObject', which is a creation/modification operation that changes project state reversibly. The context confirms this is within Unity Editor manipulation where components can be added, modified, and removed.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_component Rate-limited

add_component 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_component": {
      "limits": [
        {
          "counter": "add_component_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 MCP For Unity, so you can run agents against it safely.

FAQ

Questions about add_component

What does the add_component tool do? +

Adds a component to a GameObject. (e.g. Rigidbody, BoxCollider). It is categorised as a Write tool in the MCP For Unity 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_component? +

Register the MCP For Unity MCP server in PolicyLayer and add a rule for add_component: 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 MCP For Unity. Nothing to install.

What risk level is add_component? +

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

Can I rate-limit add_component? +

Yes. Add a rate_limit block to the add_component 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_component completely? +

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

add_component is provided by the MCP For Unity MCP server (yunuscan/mcpforunity). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.