rhino_blend_surface_edges
Create a blend surface connecting two surface edges with continuity control.
This record as markdown: /tools/easehee-rhino-mcp/rhino-blend-surface-edges.md
What rhino_blend_surface_edges does on Rhino
AI agents use rhino_blend_surface_edges 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_blend_surface_edges is rated Medium
The tool creates or modifies geometry by blending surfaces, which is a Write operation—creating new geometry objects in the CAD model. While it modifies the design, it is reversible (can be undone in Rhino or deleted). Severity is medium because a misused blend operation could create unwanted geometry requiring rework, but causes no permanent damage or external side effects.
From the tool's definition Tool name 'rhino_blend_surface_edges' and description 'Create a blend surface' indicate the tool creates geometry by connecting surface edges. This is a reversible creation operation in Rhino, not destructive deletion or execution of arbitrary code.
Attacks that exploit this kind of access
The rule that runs rhino_blend_surface_edges 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_blend_surface_edges, this is the rule to start with:
rhino_blend_surface_edges 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_blend_surface_edges call is checked against it from then on.
Questions about rhino_blend_surface_edges
Create a blend surface connecting two surface edges with continuity control. 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_blend_surface_edges: 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_blend_surface_edges 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_blend_surface_edges 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_blend_surface_edges. 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_blend_surface_edges 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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