agent_set_mode · Frx Director MCP: Risk & Policy

WHAT IT DOES

What agent_set_mode does on Frx Director

AI agents use agent_set_mode to create or update resources in Frx Director — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Frx Director environment.

WHY IT NEEDS A POLICY

Why agent_set_mode needs a policy

The tool appears to change/set a mode for an agent session, which is a configuration modification. This is reversible (modes can be switched back), placing it in Write. Description is very brief and in Chinese, lowering confidence. Severity is medium as changing agent operating mode could affect behavior of the browser reverse-engineering agent.

From the tool's definition Tool name 'agent_set_mode' and description '切会话模式' (which translates to 'switch session mode')

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

agent_set_mode Rate-limited

agent_set_mode stays usable, but capped — an agent stuck in a loop can't make hundreds of changes 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_set_mode": {
      "limits": [
        {
          "counter": "agent_set_mode_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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_set_mode

What does the agent_set_mode tool do? +

切会话模式:. It is categorised as a Write tool in the Frx Director MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on agent_set_mode? +

Register the Frx Director MCP server in PolicyLayer and add a rule for agent_set_mode: 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_set_mode? +

agent_set_mode is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit agent_set_mode? +

Yes. Add a rate_limit block to the agent_set_mode 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_set_mode completely? +

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

agent_set_mode 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.