puppeteer_set_cookies

THE RISK

Medium Risk

Why puppeteer_set_cookies needs a policy

Setting cookies is a write operation that modifies browser state reversibly. Cookies can be overwritten or cleared, making this Write rather than Destructive. Severity is medium because malicious cookie injection could enable session hijacking, credential theft, or manipulation of web application behavior, though the impact depends on the target application and cookie values used.

From the tool's definition Tool name: 'puppeteer_set_cookies' — operates on browser cookies via Puppeteer; description: 'Set cookies for the current page' indicates modification of browser state.

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

POLICY

How to control puppeteer_set_cookies

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

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "puppeteer_set_cookies": {
      "limits": [
        {
          "counter": "puppeteer_set_cookies_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

puppeteer_set_cookies 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.

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

LIMIT THIS TOOL →

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EXPLORE

Related tools and policies

More Claude TypeScript MCP Servers tools

Destructive delete_file Delete a file. This operation cannot be undone. Only works within allowed directories. Destructive delete_release Delete a release Execute puppeteer_clear_input Clear an input field Execute batch_operations Execute multiple file operations efficiently. Supports transactional mode (rollback on err Execute puppeteer_emulate_device Emulate a specific device Execute puppeteer_evaluate Execute JavaScript in the browser console Execute puppeteer_evaluate_in_frame Execute JavaScript in a specific frame Execute puppeteer_navigate Navigate to a URL

All 84 Claude TypeScript MCP Servers tools →

Write tools on other servers

M-Team MCP Server download_torrent YouTube MCP Server generate_video_title Android Forensics ADB MCP Server combine_reports 0xarchive web3_signup

Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about puppeteer_set_cookies

What does the puppeteer_set_cookies tool do? +

Set cookies for the current page. It is categorised as a Write tool in the Claude TypeScript MCP Servers MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on puppeteer_set_cookies? +

Register the Claude TypeScript MCP Servers MCP server in PolicyLayer and add a rule for puppeteer_set_cookies: 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 Claude TypeScript MCP Servers. Nothing to install.

What risk level is puppeteer_set_cookies? +

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

Can I rate-limit puppeteer_set_cookies? +

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

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

puppeteer_set_cookies is provided by the Claude TypeScript MCP Servers MCP server (ukkz/claude-ts-mcps). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Claude TypeScript MCP Servers tool call.

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

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