set_extra_headers

A execute tool on the Playwright MCP server.

SERVERPlaywright MCP Server SOURCEalexrwilliam/playwright-mcp-server

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/alexrwilliam-playwright-mcp-server/set-extra-headers.md

WHAT IT DOES

What set_extra_headers does on Playwright MCP Server

AI agents invoke set_extra_headers to trigger actions in Playwright MCP Server. 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 set_extra_headers is rated High

On a Playwright MCP server, 'set_extra_headers' likely sets custom HTTP headers for subsequent browser requests, which is an Execute-level browser automation action. Custom headers can be used to spoof identity, bypass security controls, or manipulate server behavior.

From the tool's definition Tool name 'set_extra_headers' on a Playwright browser automation server; description is empty and uninformative.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs set_extra_headers safely

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

set_extra_headers Rate-limited

set_extra_headers 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": {
    "set_extra_headers": {
      "limits": [
        {
          "counter": "set_extra_headers_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 Playwright MCP Server, apply this rule, and every set_extra_headers call is checked against it from then on.

FAQ

Questions about set_extra_headers

What does the set_extra_headers tool do? +

set_extra_headers is a execute tool on the Playwright MCP Server MCP server. It is categorised as a Execute tool in the Playwright MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on set_extra_headers? +

Register the Playwright MCP Server MCP server in PolicyLayer and add a rule for set_extra_headers: 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 Playwright MCP Server. Nothing to install.

What risk level is set_extra_headers? +

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

Can I rate-limit set_extra_headers? +

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

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

set_extra_headers is provided by the Playwright MCP Server MCP server (alexrwilliam/playwright-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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