Set extra HTTP headers for browser requests. Headers are automatically scoped to same-origin requests only, so they won
AI agents invoke browser_set_headers to trigger actions in Playwright Autopilot. 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.
This tool modifies HTTP headers sent by the browser, which affects outgoing network requests. It's not a simple read, nor does it delete data. It triggers a configuration change that influences external operations (HTTP requests), placing it in Execute. Misuse could allow header injection (e.g., spoofed auth tokens, bypassing security controls), giving it medium severity.
From the tool's definition 'Set extra HTTP headers for browser requests' — modifies the runtime behavior of the browser session for subsequent requests
Documented attack patterns abuse exactly the kind of access browser_set_headers gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Playwright Autopilot, and nothing reaches the server without passing your rules. This is the rule we recommend for browser_set_headers:
{
"version": "1",
"default": "deny",
"tools": {
"browser_set_headers": {
"limits": [
{
"counter": "browser_set_headers_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}browser_set_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.
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Set extra HTTP headers for browser requests. Headers are automatically scoped to same-origin requests only, so they won. It is categorised as a Execute tool in the Playwright Autopilot MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Playwright Autopilot MCP server in PolicyLayer and add a rule for browser_set_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 Autopilot. Nothing to install.
browser_set_headers is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the browser_set_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.
Set action: deny in the PolicyLayer policy for browser_set_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.
browser_set_headers is provided by the Playwright Autopilot MCP server (kaizen-yutani/playwright-autopilot). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Playwright Autopilot, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
51 Playwright Autopilot tools catalogued and risk-classified — across an index of 43,000+ MCP servers.