create_role · HAP MCP Server MCP: Risk & Policy

WHAT IT DOES

What create_role does on HAP MCP Server

AI agents use create_role to create or update resources in HAP MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your HAP MCP Server environment.

WHY IT NEEDS A POLICY

Why create_role needs a policy

Creating a role modifies the application's access control structure and can affect permissions, but it is reversible (the role can be deleted via the sibling tool 'delete_role'). This is a Write operation rather than Execute, as it does not run arbitrary code or trigger complex external operations.

From the tool's definition Tool name 'create_role' and description 'Create a new role in the application' indicate a create operation that adds new data (a role) to the system.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_role Rate-limited

create_role 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": {
    "create_role": {
      "limits": [
        {
          "counter": "create_role_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches HAP MCP Server, so you can run agents against it safely.

FAQ

Questions about create_role

What does the create_role tool do? +

Create a new role in the application. It is categorised as a Write tool in the HAP MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on create_role? +

Register the HAP MCP Server MCP server in PolicyLayer and add a rule for create_role: 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 HAP MCP Server. Nothing to install.

What risk level is create_role? +

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

Can I rate-limit create_role? +

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

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

create_role is provided by the HAP MCP Server MCP server (mingdaocloud/hap-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.