analyze_api_categories

THE RISK

Low Risk

Why analyze_api_categories needs a policy

This tool performs statistical or analytical queries on the APIs.guru directory to understand how APIs are distributed across categories. It retrieves and processes metadata only, with no capability to create, modify, delete, or execute external operations. The operation has no side effects and fits the Read category pattern of querying data for discovery and analysis purposes.

From the tool's definition Tool name 'analyze_api_categories' and description 'Analyze API distribution by categories' indicate a query/analysis operation that retrieves and categorizes existing API metadata from the directory.

Documented attack patterns abuse exactly the kind of access analyze_api_categories gives an agent:

POLICY

How to control analyze_api_categories

PolicyLayer is an MCP gateway — it sits between your AI agents and OpenAPI Directory MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for analyze_api_categories:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "analyze_api_categories": {}
  }
}

analyze_api_categories 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 OpenAPI Directory MCP Server — 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.
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 analyze_api_categories

What does the analyze_api_categories tool do? +

Analyze API distribution by categories. It is categorised as a Read tool in the OpenAPI Directory MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on analyze_api_categories? +

Register the OpenAPI Directory MCP Server MCP server in PolicyLayer and add a rule for analyze_api_categories: 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 OpenAPI Directory MCP Server. Nothing to install.

What risk level is analyze_api_categories? +

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

Can I rate-limit analyze_api_categories? +

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

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

analyze_api_categories is provided by the OpenAPI Directory MCP Server MCP server (rawveg/openapi-directory-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every OpenAPI Directory MCP Server tool call.

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

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