Switch to a different Google account or re-authenticate.
AI agents call re_auth to retrieve information from NotebookLM MCP Structured without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Even though re_auth only reads data, uncontrolled read access leaks sensitive information and racks up API costs — an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.
Documented attack patterns abuse exactly the kind of access re_auth gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and NotebookLM MCP Structured, and nothing reaches the server without passing your rules. This is the rule we recommend for re_auth:
{
"version": "1",
"default": "deny",
"tools": {
"re_auth": {}
}
}re_auth is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Switch to a different Google account or re-authenticate. It is categorised as a Read tool in the NotebookLM MCP Structured MCP Server, which means it retrieves data without modifying state.
Register the NotebookLM MCP Structured MCP server in PolicyLayer and add a rule for re_auth: 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 NotebookLM MCP Structured. Nothing to install.
re_auth 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 re_auth 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 re_auth. 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.
re_auth is provided by the NotebookLM MCP Structured MCP server (paolodalprato/notebooklm-mcp-structured). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 15 NotebookLM MCP Structured tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
15 NotebookLM MCP Structured tools catalogued and risk-classified — across an index of 42,500+ MCP servers.