Clear a session
AI agents call reset_session to permanently remove resources in Notebooklm — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Clearing a session is an irreversible action that destroys session data. While the blast radius is limited to session state (not persistent data like notebooks or sources), it cannot be undone and could disrupt ongoing operations.
From the tool's definition 'reset_session' and 'Clear a session' — clearing/resetting a session irreversibly destroys session state, authentication tokens, and any in-progress work tied to that session.
Attacks that exploit this kind of access
Clear a session. It is categorised as a Destructive tool in the Notebooklm MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Notebooklm MCP server in PolicyLayer and add a rule for reset_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 Notebooklm. Nothing to install.
reset_session is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the reset_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 reset_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.
reset_session is provided by the Notebooklm MCP server (notebooklm-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.
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