Check the current authentication state of the active page.
AI agents call web_check_auth_state to retrieve information from Fourth Playwright MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves authentication state information from the active page—a non-destructive, side-effect-free read operation. It does not create, modify, delete data, execute code with unpredictable effects, or move money. The tool is purely informational and fits the Read category profile of retrieving or querying data with no side effects.
From the tool's definition Tool name 'web_check_auth_state' and description 'Check the current authentication state of the active page' indicate a read-only query operation that retrieves information about the current authentication state without modifying any data or executing…
Attacks that exploit this kind of access
Check the current authentication state of the active page. It is categorised as a Read tool in the Fourth Playwright MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Fourth Playwright MCP Server MCP server in PolicyLayer and add a rule for web_check_auth_state: 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 Fourth Playwright MCP Server. Nothing to install.
web_check_auth_state is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the web_check_auth_state 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 web_check_auth_state. 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.
web_check_auth_state is provided by the Fourth Playwright MCP Server MCP server (rev4nchist/fourth-playwright-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
Teams ship this data inside their own products. See what a licence covers →