mittwald_app_open · Mittwald MCP Server MCP: Risk & Policy

WHAT IT DOES

What mittwald_app_open does on Mittwald MCP Server

AI agents invoke mittwald_app_open to trigger actions in Mittwald 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 mittwald_app_open needs a policy

This tool triggers an external browser action (opening a URL), which is an Execute-category operation. It doesn't read/write data or cause destructive changes, but it does invoke an external operation (browser navigation). The blast radius is low since opening a browser page is largely benign.

From the tool's definition Open an app installation in the browser

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

mittwald_app_open Rate-limited

mittwald_app_open 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": {
    "mittwald_app_open": {
      "limits": [
        {
          "counter": "mittwald_app_open_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 Mittwald MCP Server, so you can run agents against it safely.

FAQ

Questions about mittwald_app_open

What does the mittwald_app_open tool do? +

Open an app installation in the browser. It is categorised as a Execute tool in the Mittwald 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 mittwald_app_open? +

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

What risk level is mittwald_app_open? +

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

Can I rate-limit mittwald_app_open? +

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

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

mittwald_app_open is provided by the Mittwald MCP Server MCP server (mittwald/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.