AI agents use set_material to create or update resources in SketchupMCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your SketchupMCP environment.
Setting a material on a component is a reversible modification of model data. It changes the visual appearance and properties of a component but does not delete data, execute arbitrary code, or create financial obligations. This is a write operation in the Write category.
From the tool's definition Tool description states "Set material for a component" - this modifies component properties in the Sketchup model.
Documented attack patterns abuse exactly the kind of access set_material gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and SketchupMCP, and nothing reaches the server without passing your rules. This is the rule we recommend for set_material:
{
"version": "1",
"default": "deny",
"tools": {
"set_material": {
"limits": [
{
"counter": "set_material_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}set_material 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.
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Set material for a component. It is categorised as a Write tool in the SketchupMCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Sketchup MCP server in PolicyLayer and add a rule for set_material: 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 SketchupMCP. Nothing to install.
set_material 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 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. 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 is provided by the Sketchup MCP server (mhyrr/sketchup-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from SketchupMCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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10 SketchupMCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.