unity_script_update

Update the contents of an existing C# script file.

SERVERUnity MCP Server SOURCEanklebreaker-studio/unity-mcp-server

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/anklebreaker-studio-unity-mcp-server/unity-script-update.md

WHAT IT DOES

What unity_script_update does on Unity MCP Server

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

RISK

Why unity_script_update is rated Medium

This tool modifies script files reversibly (existing C# scripts can be edited, versions controlled, or reverted). While it doesn't delete data, it can change critical game logic, asset references, and application behavior. The high severity reflects the potential for an AI agent to inadvertently corrupt game logic, break dependencies, or introduce security vulnerabilities in production code.

From the tool's definition Tool name 'unity_script_update' and description 'Update the contents of an existing C# script file' directly indicate modification of existing code files.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs unity_script_update safely

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

unity_script_update Rate-limited

unity_script_update 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": {
    "unity_script_update": {
      "limits": [
        {
          "counter": "unity_script_update_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 Unity MCP Server, apply this rule, and every unity_script_update call is checked against it from then on.

FAQ

Questions about unity_script_update

What does the unity_script_update tool do? +

Update the contents of an existing C# script file. It is categorised as a Write tool in the Unity MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on unity_script_update? +

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

What risk level is unity_script_update? +

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

Can I rate-limit unity_script_update? +

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

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

unity_script_update is provided by the Unity MCP Server MCP server (anklebreaker-studio/unity-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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