humanizer_idle

THE RISK

High Risk

Why humanizer_idle needs a policy

This tool actively triggers browser/UI automation actions (mouse movement micro-jitter and scrolling), making it an Execute category tool. It simulates human-like behavior to avoid bot detection, which in a MITM proxy context could be used to manipulate automated browser sessions. Misuse could facilitate deceptive automation or fingerprint evasion, warranting medium severity.

From the tool's definition Simulate idle behavior with mouse micro-jitter and occasional micro-scrolls

Documented attack patterns abuse exactly the kind of access humanizer_idle gives an agent:

POLICY

How to control humanizer_idle

PolicyLayer is an MCP gateway — it sits between your AI agents and Proxy, and nothing reaches the server without passing your rules. This is the rule we recommend for humanizer_idle:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "humanizer_idle": {
      "limits": [
        {
          "counter": "humanizer_idle_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

humanizer_idle 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.

Create a free account and register Proxy — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

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All 89 Proxy tools →

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Go deeper

High-risk tools in Proxy → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Agent sandbox → Bounding what an agent can execute and where the boundary should sit.
Least privilege for MCP → Granting agents the minimum tool surface the task needs.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about humanizer_idle

What does the humanizer_idle tool do? +

Simulate idle behavior with mouse micro-jitter and occasional micro-scrolls. It is categorised as a Execute tool in the Proxy MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on humanizer_idle? +

Register the Proxy MCP server in PolicyLayer and add a rule for humanizer_idle: 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 Proxy. Nothing to install.

What risk level is humanizer_idle? +

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

Can I rate-limit humanizer_idle? +

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

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

humanizer_idle is provided by the Proxy MCP server (yfe404/proxy-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Proxy tool call.

Start from Proxy, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →