set_material_instance_texture
Set a texture parameter on a material instance.
This record as markdown: /tools/jjpxdev-unreal-mcp/set-material-instance-texture.md
What set_material_instance_texture does on Unreal
AI agents use set_material_instance_texture to create or update resources in Unreal, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Unreal environment.
| Parameter | Type | Required | Description |
|---|---|---|---|
texture_path | string | Yes | Texture asset path |
instance_path | string | Yes | Material instance asset path |
parameter_name | string | Yes | Texture parameter name |
Parameters from the server's own tool schema.
Why set_material_instance_texture is rated Medium
This tool modifies material instance parameters by setting texture values. It creates or updates asset configuration in a reversible manner (the texture parameter can be changed again or reverted), making it a Write operation rather than Destructive. The severity is medium because misuse could alter visual rendering or corrupt asset state, but the change is not permanent and can be undone.
From the tool's definition Tool name 'set_material_instance_texture' and description 'Set a texture parameter on a material instance' indicate modification of material properties. This is a reversible change to an asset parameter.
Attacks that exploit this kind of access
The rule that runs set_material_instance_texture safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Unreal, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For set_material_instance_texture, this is the rule to start with:
set_material_instance_texture 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 Unreal, apply this rule, and every set_material_instance_texture call is checked against it from then on.
Questions about set_material_instance_texture
Set a texture parameter on a material instance. It is categorised as a Write tool in the Unreal MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
set_material_instance_texture accepts 3 parameters: texture_path, instance_path, parameter_name. Required: texture_path, instance_path, parameter_name. The full parameter table on this page comes from the server's own tool schema.
Register the Unreal MCP server in PolicyLayer and add a rule for set_material_instance_texture: 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 Unreal. Nothing to install.
set_material_instance_texture 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_instance_texture 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_instance_texture. 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_instance_texture is provided by the Unreal MCP server (@jjpxdev/unreal-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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