write_script · Godot MCP Unified MCP: Risk & Policy

WHAT IT DOES

What write_script does on Godot MCP Unified

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

WHY IT NEEDS A POLICY

Why write_script needs a policy

This tool creates or modifies GDScript files, which are executable code files in Godot. While the action itself is reversible (files can be edited or deleted), the severity is elevated to 'high' because injected or malicious scripts could compromise game logic, steal data, or introduce vulnerabilities when executed by the engine.

From the tool's definition Tool name is 'write_script' and description explicitly states 'Create or update a GDScript (.gd) file'. The verb 'write' combined with 'create or update' clearly indicates reversible data modification.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

write_script Rate-limited

write_script 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": {
    "write_script": {
      "limits": [
        {
          "counter": "write_script_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 Godot MCP Unified, so you can run agents against it safely.

FAQ

Questions about write_script

What does the write_script tool do? +

Create or update a GDScript (.gd) file. It is categorised as a Write tool in the Godot MCP Unified MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on write_script? +

Register the Godot MCP Unified MCP server in PolicyLayer and add a rule for write_script: 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 Godot MCP Unified. Nothing to install.

What risk level is write_script? +

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

Can I rate-limit write_script? +

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

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

write_script is provided by the Godot MCP Unified MCP server (pierrealexandreguillemin-a11y/godot-mcp-unified). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.