step_out · JS Reverse MCP: Risk & Policy

WHAT IT DOES

What step_out does on JS Reverse MCP

AI agents invoke step_out to trigger actions in JS Reverse MCP. 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 step_out needs a policy

This tool controls browser debugger execution flow by stepping out of the current function. It triggers an external operation (debugger state change) in a live browser debugging session, which fits the Execute category. Misuse could alter program flow during sensitive reverse engineering or debugging sessions.

From the tool's definition Steps out of the current function, continuing until the function returns. Use this to quickly exit a function.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

step_out Rate-limited

step_out 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": {
    "step_out": {
      "limits": [
        {
          "counter": "step_out_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 JS Reverse MCP, so you can run agents against it safely.

FAQ

Questions about step_out

What does the step_out tool do? +

Steps out of the current function, continuing until the function returns. Use this to quickly exit a function. It is categorised as a Execute tool in the JS Reverse MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on step_out? +

Register the JS Reverse MCP server in PolicyLayer and add a rule for step_out: 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 JS Reverse MCP. Nothing to install.

What risk level is step_out? +

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

Can I rate-limit step_out? +

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

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

step_out is provided by the JS Reverse MCP server (noone-hub/jsreverser-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.