agent_wait_for_stop · Frx Director MCP: Risk & Policy

WHAT IT DOES

What agent_wait_for_stop does on Frx Director

AI agents invoke agent_wait_for_stop to trigger actions in Frx Director. 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 agent_wait_for_stop needs a policy

This tool synchronizes with and manages the execution state of a worker agent driving firefox-reverse browser operations. While it does not directly execute code or modify data itself, it blocks and controls the flow of agent execution—orchestrating when operations proceed, which is characteristic of Execute tools.

From the tool's definition Tool description indicates blocking polling that waits for worker to settle (reach a phase gate). The Chinese text '阻塞轮询直到 worker 这一轮 settled(阶段门到了)' translates to 'blocking poll until worker this round settled (phase gate reached)'.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

agent_wait_for_stop Rate-limited

agent_wait_for_stop 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": {
    "agent_wait_for_stop": {
      "limits": [
        {
          "counter": "agent_wait_for_stop_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 Frx Director, so you can run agents against it safely.

FAQ

Questions about agent_wait_for_stop

What does the agent_wait_for_stop tool do? +

阻塞轮询直到 worker 这一轮 settled(阶段门到了)。这是. It is categorised as a Execute tool in the Frx Director MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on agent_wait_for_stop? +

Register the Frx Director MCP server in PolicyLayer and add a rule for agent_wait_for_stop: 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 Frx Director. Nothing to install.

What risk level is agent_wait_for_stop? +

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

Can I rate-limit agent_wait_for_stop? +

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

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

agent_wait_for_stop is provided by the Frx Director MCP server (whitenightshadow/frx-director-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.