solve_captcha · Puppeteer Real Browser MCP: Risk & Policy

WHAT IT DOES

What solve_captcha does on Puppeteer Real Browser

AI agents invoke solve_captcha to trigger actions in Puppeteer Real Browser. 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 solve_captcha needs a policy

Solving CAPTCHAs involves executing automated browser actions to bypass security controls on external websites. This is an Execute-category action because it runs external operations (interacting with CAPTCHA challenge systems) whose effects depend on the current state of the browser and target site.

From the tool's definition 'Attempt to solve CAPTCHAs' — triggers automated browser interaction to bypass anti-bot mechanisms

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

solve_captcha Rate-limited

solve_captcha 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": {
    "solve_captcha": {
      "limits": [
        {
          "counter": "solve_captcha_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 Puppeteer Real Browser, so you can run agents against it safely.

FAQ

Questions about solve_captcha

What does the solve_captcha tool do? +

Attempt to solve CAPTCHAs (if supported). It is categorised as a Execute tool in the Puppeteer Real Browser MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on solve_captcha? +

Register the Puppeteer Real Browser MCP server in PolicyLayer and add a rule for solve_captcha: 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 Puppeteer Real Browser. Nothing to install.

What risk level is solve_captcha? +

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

Can I rate-limit solve_captcha? +

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

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

solve_captcha is provided by the Puppeteer Real Browser MCP server (puppeteer-real-browser-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.