This record as markdown: /tools/yanhuifair-godot-mcp/create-gdextension.md
What create_gdextension does on Godot
AI agents use create_gdextension to create or update resources in Godot, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Godot environment.
| Parameter | Type | Required | Description |
|---|---|---|---|
path | string | Yes | Output path for new .gdextension (e.g. "addons/myext/myext.gdextension") |
entry_symbol | object | — | Entry symbol (init function name) |
library_path | object | — | Path to the compiled library (e.g. "res://addons/myext/bin/libmyext.linux.debug.x86_64.so") |
Parameters from the server's own tool schema.
Why create_gdextension is rated Medium
Creates a new Godot extension configuration file; reversible modification but enables external code execution in Godot.
From the tool's definition Create a .gdextension config file.
Risk signalsAccepts file system path (path)
Attacks that exploit this kind of access
The rule that runs create_gdextension safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Godot, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For create_gdextension, this is the rule to start with:
create_gdextension 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.
The button opens the PolicyLayer dashboard: create your workspace, connect Godot, apply this rule, and every create_gdextension call is checked against it from then on.
Questions about create_gdextension
Create a .gdextension config file. It is categorised as a Write tool in the Godot MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
create_gdextension accepts 3 parameters: path, entry_symbol, library_path. Required: path. The full parameter table on this page comes from the server's own tool schema.
Register the Godot MCP server in PolicyLayer and add a rule for create_gdextension: 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. Nothing to install.
create_gdextension is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the create_gdextension 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.
Set action: deny in the PolicyLayer policy for create_gdextension. 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.
create_gdextension is provided by the Godot MCP server (@yanhuifair/godot-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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