patch_surface

A write tool on the Aos MCP server.

SERVERAos SOURCE@hybridlabor-api/aos

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/hybridlabor-api-aos/patch-surface.md

WHAT IT DOES

What patch_surface does on Aos

AI agents use patch_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.

RISK

Why patch_surface is rated Medium

patch_surface creates or modifies surface geometry in Rhino, a reversible operation consistent with the Write category. While the empty description lowers confidence, the sibling tools and server's stated purpose (create geometry) strongly suggest this performs geometric creation/editing rather than destructive deletion.

From the tool's definition Tool name 'patch_surface' on a server that 'create geometry, run booleans, drive Grasshopper' and 'execute arbitrary Python scripts' in Rhino 8. Sibling tools include geometric operations like 'boolean_difference', 'boolean_union', 'apply_transform'.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs patch_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 patch_surface, this is the rule to start with:

patch_surface Rate-limited

patch_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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "patch_surface": {
      "limits": [
        {
          "counter": "patch_surface_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Aos, apply this rule, and every patch_surface call is checked against it from then on.

FAQ

Questions about patch_surface

What does the patch_surface tool do? +

patch_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.

How do I enforce a policy on patch_surface? +

Register the Aos MCP server in PolicyLayer and add a rule for patch_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.

What risk level is patch_surface? +

patch_surface is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit patch_surface? +

Yes. Add a rate_limit block to the patch_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.

How do I block patch_surface completely? +

Set action: deny in the PolicyLayer policy for patch_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.

What MCP server provides patch_surface? +

patch_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.

KEEP EXPLORING

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