get-custom-apis

THE RISK

Low Risk

Why get-custom-apis needs a policy

This tool queries and lists Custom API definitions, performing a read-only operation that retrieves existing configuration data. No data is created, modified, deleted, or executed. The optional filtering parameter is a read operation qualifier, not a side-effect generator.

From the tool's definition Tool name 'get-custom-apis' and description 'List Custom API definitions in the PowerPlatform environment with optional filtering' indicates retrieval of metadata without modification.

Documented attack patterns abuse exactly the kind of access get-custom-apis gives an agent:

POLICY

How to control get-custom-apis

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 get-custom-apis:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "get-custom-apis": {}
  }
}

get-custom-apis is read-only, so it stays allowed — but 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.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about get-custom-apis

What does the get-custom-apis tool do? +

List Custom API definitions in the PowerPlatform environment with optional filtering. It is categorised as a Read tool in the PowerPlatform MCP MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get-custom-apis? +

Register the PowerPlatform MCP server in PolicyLayer and add a rule for get-custom-apis: 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 get-custom-apis? +

get-custom-apis is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit get-custom-apis? +

Yes. Add a rate_limit block to the get-custom-apis 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 get-custom-apis completely? +

Set action: deny in the PolicyLayer policy for get-custom-apis. 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 get-custom-apis? +

get-custom-apis 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 →