Restore a previously saved browser session. Creates a new browser context with saved cookies/localStorage, re-applies headers, and navigates to the saved URL.
AI agents invoke browser_restore_session 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 executes browser-level operations: creating a new browser context, restoring authentication state (cookies/localStorage), re-applying headers, and navigating to a URL. Restoring a session with saved credentials and navigating could trigger authenticated actions, access sensitive data, or initiate operations in external systems — effects that depend on the saved session state.
From the tool's definition Restore a previously saved browser session. Creates a new browser context with saved cookies/localStorage, re-applies headers, and navigates to the saved URL.
Documented attack patterns abuse exactly the kind of access browser_restore_session 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_restore_session:
{
"version": "1",
"default": "deny",
"tools": {
"browser_restore_session": {
"limits": [
{
"counter": "browser_restore_session_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}browser_restore_session 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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Restore a previously saved browser session. Creates a new browser context with saved cookies/localStorage, re-applies headers, and navigates to the saved URL. 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_restore_session: 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_restore_session 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_restore_session 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_restore_session. 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_restore_session 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.
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51 Playwright Autopilot tools catalogued and risk-classified — across an index of 43,000+ MCP servers.