This record as markdown: /tools/hybridlabor-api-aos/rebuild-surface.md
What rebuild_surface does on Aos
AI agents use rebuild_surface to create or update resources in Aos, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Aos environment.
Why rebuild_surface is rated Medium
In Rhino, 'rebuild' operations reconstruct geometry with new control point counts/degrees, modifying existing surface data. This is a Write operation as it modifies geometry reversibly. However, the empty description lowers confidence significantly. Severity is medium given the blast radius of modifying 3D geometry in a design workflow.
From the tool's definition Tool name 'rebuild_surface' on a Rhino 3D MCP server; description is empty and uninformative.
Attacks that exploit this kind of access
The rule that runs rebuild_surface safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Aos, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For rebuild_surface, this is the rule to start with:
rebuild_surface 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 Aos, apply this rule, and every rebuild_surface call is checked against it from then on.
Questions about rebuild_surface
rebuild_surface is a write tool on the Aos MCP server. It is categorised as a Write tool in the Aos MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Aos MCP server in PolicyLayer and add a rule for rebuild_surface: 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 Aos. Nothing to install.
rebuild_surface 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 rebuild_surface 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 rebuild_surface. 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.
rebuild_surface is provided by the Aos MCP server (@hybridlabor-api/aos). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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