build_vrf_overlay

Create a LOCAL-scoped VRF bound to scope_id + device_function.

SERVERAPI-Central SOURCEsecure-ssid/centralmcp

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/secure-ssid-centralmcp/build-vrf-overlay.md

WHAT IT DOES

What build_vrf_overlay does on API-Central

AI agents use build_vrf_overlay to create or update resources in API-Central, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your API-Central environment.

RISK

Why build_vrf_overlay is rated Medium

The tool creates a new VRF (Virtual Routing and Forwarding) overlay configuration, which is a network write operation. It establishes new routing domains bound to specific scope and device function parameters. This is reversible (VRFs can be deleted), so it falls under Write rather than Destructive. Misuse could cause network segmentation issues or routing disruptions, hence medium severity.

From the tool's definition "Create a LOCAL-scoped VRF bound to scope_id + device_function" — 'Create' indicates a write/configuration action that creates a new VRF overlay resource

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs build_vrf_overlay safely

PolicyLayer is an MCP gateway: it sits between your AI agents and API-Central, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For build_vrf_overlay, this is the rule to start with:

build_vrf_overlay Rate-limited

build_vrf_overlay 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": {
    "build_vrf_overlay": {
      "limits": [
        {
          "counter": "build_vrf_overlay_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 API-Central, apply this rule, and every build_vrf_overlay call is checked against it from then on.

FAQ

Questions about build_vrf_overlay

What does the build_vrf_overlay tool do? +

Create a LOCAL-scoped VRF bound to scope_id + device_function. It is categorised as a Write tool in the API-Central MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on build_vrf_overlay? +

Register the API-Central MCP server in PolicyLayer and add a rule for build_vrf_overlay: 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 API-Central. Nothing to install.

What risk level is build_vrf_overlay? +

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

Can I rate-limit build_vrf_overlay? +

Yes. Add a rate_limit block to the build_vrf_overlay 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 build_vrf_overlay completely? +

Set action: deny in the PolicyLayer policy for build_vrf_overlay. 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 build_vrf_overlay? +

build_vrf_overlay is provided by the API-Central MCP server (secure-ssid/centralmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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