http_request · MCP Server Fly MCP: Risk & Policy

WHAT IT DOES

What http_request does on MCP Server Fly

AI agents invoke http_request to trigger actions in MCP Server Fly. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why http_request needs a policy

This tool makes arbitrary HTTP requests to any public URL. Depending on arguments, it could trigger GET, POST, PUT, DELETE, or other methods against any external service, including APIs that perform writes, deletes, or financial operations.

From the tool's definition Make an HTTP request to a public HTTP/HTTPS URL

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

http_request Rate-limited

http_request stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "http_request": {
      "limits": [
        {
          "counter": "http_request_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about http_request

What does the http_request tool do? +

Make an HTTP request to a public HTTP/HTTPS URL. It is categorised as a Execute tool in the MCP Server Fly MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on http_request? +

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

What risk level is http_request? +

http_request is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit http_request? +

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

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

http_request is provided by the MCP Server Fly MCP server (kushalkachari993-dev/mcp-server-fly). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.