create-custom-api-response-property

THE RISK

Medium Risk

Why create-custom-api-response-property needs a policy

Creating a response property modifies the Custom API's configuration reversibly—the property can be updated or removed later. While this affects system behavior and metadata, it does not execute arbitrary code, delete data, or move money. Write is the appropriate category.

From the tool's definition The tool name contains 'create' and the description states it will 'Create a response property for a Custom API'. This is a write operation that adds a new property definition to an existing Custom API resource.

Documented attack patterns abuse exactly the kind of access create-custom-api-response-property gives an agent:

POLICY

How to control create-custom-api-response-property

PolicyLayer is an MCP gateway — it sits between your AI agents and PowerPlatform MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for create-custom-api-response-property:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "create-custom-api-response-property": {
      "limits": [
        {
          "counter": "create-custom-api-response-property_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

create-custom-api-response-property 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.

Create a free account and register PowerPlatform MCP — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about create-custom-api-response-property

What does the create-custom-api-response-property tool do? +

Create a response property for a Custom API. It is categorised as a Write tool in the PowerPlatform MCP 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-custom-api-response-property? +

Register the PowerPlatform MCP server in PolicyLayer and add a rule for create-custom-api-response-property: 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 PowerPlatform MCP. Nothing to install.

What risk level is create-custom-api-response-property? +

create-custom-api-response-property is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit create-custom-api-response-property? +

Yes. Add a rate_limit block to the create-custom-api-response-property 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-custom-api-response-property completely? +

Set action: deny in the PolicyLayer policy for create-custom-api-response-property. 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-custom-api-response-property? +

create-custom-api-response-property is provided by the PowerPlatform MCP server (michsob/powerplatform-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every PowerPlatform MCP tool call.

Start from PowerPlatform MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →