rhino_material_assign
Assign an existing material to one or more objects.
This record as markdown: /tools/easehee-rhino-mcp/rhino-material-assign.md
What rhino_material_assign does on Rhino
AI agents use rhino_material_assign to create or update resources in Rhino, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Rhino environment.
Why rhino_material_assign is rated Medium
This tool modifies the properties of Rhino objects by assigning materials to them. This is a Write operation because it creates or modifies data (object material assignments) in a reversible manner—materials can be unassigned or changed. It does not delete data (Destructive), execute arbitrary code (Execute), involve financial transactions (Financial), or merely read data (Read).
From the tool's definition Tool name 'rhino_material_assign' and description 'Assign an existing material to one or more objects' indicate modification of object properties in Rhino. Assignment of materials is a reversible change to object attributes.
Attacks that exploit this kind of access
The rule that runs rhino_material_assign safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Rhino, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For rhino_material_assign, this is the rule to start with:
rhino_material_assign 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 Rhino, apply this rule, and every rhino_material_assign call is checked against it from then on.
Questions about rhino_material_assign
Assign an existing material to one or more objects. It is categorised as a Write tool in the Rhino MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Rhino MCP server in PolicyLayer and add a rule for rhino_material_assign: 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 Rhino. Nothing to install.
rhino_material_assign 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 rhino_material_assign 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 rhino_material_assign. 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.
rhino_material_assign is provided by the Rhino MCP server (easehee/rhino-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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