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What rhino_mesh_box does on Rhino
AI agents use rhino_mesh_box 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_mesh_box is rated Medium
This tool creates new 3D mesh geometry in Rhino, which is a reversible write operation. While the geometric object can be deleted later, the tool itself performs creation/modification of the CAD model state. It does not execute arbitrary code, delete data irreversibly, or move money, so Write is the appropriate category.
From the tool's definition Tool name 'rhino_mesh_box' and description 'Add a quad mesh box with the given subdivisions' indicate creation of geometric data in Rhino. The verb 'Add' explicitly denotes a write operation that creates new geometry.
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The rule that runs rhino_mesh_box 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_mesh_box, this is the rule to start with:
rhino_mesh_box 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_mesh_box call is checked against it from then on.
Questions about rhino_mesh_box
Add a quad mesh box with the given subdivisions. 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_mesh_box: 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_mesh_box 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_mesh_box 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_mesh_box. 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_mesh_box 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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