stealth_set_user_agent

Set User-Agent and fingerprint.

SERVERJshookmcp SOURCE@jshookmcp/jshook

High RISK CLASS

Category Execute

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-vmoranv-jshookmcp/stealth-set-user-agent.md

WHAT IT DOES

What stealth_set_user_agent does on Jshookmcp

AI agents invoke stealth_set_user_agent to trigger actions in Jshookmcp. 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.

RISK

Why stealth_set_user_agent is rated High

Modifies browser identity/fingerprint, enabling deceptive or evasive browser automation behavior.

From the tool's definition Set User-Agent and fingerprint

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs stealth_set_user_agent safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Jshookmcp, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For stealth_set_user_agent, this is the rule to start with:

stealth_set_user_agent Rate-limited

stealth_set_user_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": {
    "stealth_set_user_agent": {
      "limits": [
        {
          "counter": "stealth_set_user_agent_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Jshookmcp, apply this rule, and every stealth_set_user_agent call is checked against it from then on.

FAQ

Questions about stealth_set_user_agent

What does the stealth_set_user_agent tool do? +

Set User-Agent and fingerprint. It is categorised as a Execute tool in the Jshookmcp MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on stealth_set_user_agent? +

Register the Jshook MCP server in PolicyLayer and add a rule for stealth_set_user_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 Jshookmcp. Nothing to install.

What risk level is stealth_set_user_agent? +

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

Can I rate-limit stealth_set_user_agent? +

Yes. Add a rate_limit block to the stealth_set_user_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 stealth_set_user_agent completely? +

Set action: deny in the PolicyLayer policy for stealth_set_user_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 stealth_set_user_agent? +

stealth_set_user_agent is provided by the Jshook MCP server (@jshookmcp/jshook). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

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