run_reverse_agent · JS Reverse MCP: Risk & Policy

WHAT IT DOES

What run_reverse_agent does on JS Reverse MCP

AI agents invoke run_reverse_agent 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 run_reverse_agent needs a policy

This tool executes arbitrary reverse engineering operations autonomously in a loop until a stopping condition. While it doesn't directly delete data (not Destructive), it performs active operations that execute code and modify browser state through hook injection and script manipulation. The autonomous planning-and-execution loop amplifies risk if the agent is misdirected.

From the tool's definition Tool description states it 'repeatedly plans and executes the main reverse chain' and 'auto_rebuild_fix_loop' is listed as a sibling tool. The server context describes 'browser debugging', 'script analysis', 'automated hook injection', and 'network tracing'.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

run_reverse_agent Rate-limited

run_reverse_agent 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": {
    "run_reverse_agent": {
      "limits": [
        {
          "counter": "run_reverse_agent_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 run_reverse_agent

What does the run_reverse_agent tool do? +

One-shot reverse agent entry: repeatedly plans and executes the main reverse chain until blocked, stalled, or reaching the analysis checkpoint. 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 run_reverse_agent? +

Register the JS Reverse MCP server in PolicyLayer and add a rule for run_reverse_agent: 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 run_reverse_agent? +

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

Can I rate-limit run_reverse_agent? +

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

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

run_reverse_agent 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.