AI agents use set_material_param 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 | Path to .tres material file |
param | string | Yes | Parameter name (e.g. "metallic", "roughness", "albedo_color") |
value | string | Yes | Parameter value (e.g. "0.5", "Color(1,0,0,1)") |
Parameters from the server's own tool schema.
This tool modifies material parameters in the Godot engine, which are reversible changes to game assets. It does not execute arbitrary code, delete data irreversibly, or create financial obligations. While it affects visual rendering, the change is non-destructive and can be undone or overwritten.
From the tool's definition Tool name 'set_material_param' combined with description 'Set a single material parameter' indicates modification of material properties. The verb 'set' and action of changing a parameter are characteristic of Write operations.
Risk signalsAccepts file system path (path)
Attacks that exploit this kind of access
Set a single material parameter. 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.
set_material_param accepts 3 parameters: path, param, value. Required: path, param, value. 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 set_material_param: 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.
set_material_param 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 set_material_param 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 set_material_param. 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.
set_material_param 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.
set_material_param is one line of Godot's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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