get-custom-api

THE RISK

Low Risk

Why get-custom-api needs a policy

This tool retrieves a single Custom API definition by name. It performs a lookup/query operation with no data modification, side effects, or external execution. It falls clearly into the Read category as a metadata retrieval operation.

From the tool's definition Tool name is 'get-custom-api' and description states 'Get a single Custom API definition by unique name'. The verb 'Get' and the retrieval-only nature confirm this is a read operation that queries metadata without modification or side effects.

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

POLICY

How to control get-custom-api

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-api:

policy.json

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

get-custom-api 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-api

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

Get a single Custom API definition by unique name. 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-api? +

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

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

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

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

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

get-custom-api 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 →