proxy_start_server · Web Proxy MCP Server MCP: Risk & Policy

WHAT IT DOES

What proxy_start_server does on Web Proxy MCP Server

AI agents invoke proxy_start_server to trigger actions in Web Proxy MCP Server. 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 proxy_start_server needs a policy

Starting a proxy server triggers external operations (network binding, service initialization, traffic interception) whose effects depend on configuration arguments. SSL bumping capability means the tool can decrypt and inspect HTTPS traffic, affecting network behavior.

From the tool's definition Tool name 'proxy_start_server' and description 'Start the proxy server with optional SSL bumping' indicate the tool launches and activates a network service with the capability to intercept encrypted traffic ('SSL bumping').

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

proxy_start_server Rate-limited

proxy_start_server 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": {
    "proxy_start_server": {
      "limits": [
        {
          "counter": "proxy_start_server_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 Web Proxy MCP Server, so you can run agents against it safely.

FAQ

Questions about proxy_start_server

What does the proxy_start_server tool do? +

Start the proxy server with optional SSL bumping. It is categorised as a Execute tool in the Web Proxy MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on proxy_start_server? +

Register the Web Proxy MCP Server MCP server in PolicyLayer and add a rule for proxy_start_server: 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 Web Proxy MCP Server. Nothing to install.

What risk level is proxy_start_server? +

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

Can I rate-limit proxy_start_server? +

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

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

proxy_start_server is provided by the Web Proxy MCP Server MCP server (mako10k/mcp-web-proxy). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.