Get the AI-generated guide (summary + key topics) for a source.
AI agents call source_guide to retrieve information from NotebookLM 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 an AI-generated summary and key topics for a source document. No data is created, modified, deleted, or executed—it only queries and returns information. The blast radius of misuse is minimal; an agent could only retrieve summaries it shouldn't access, which is a confidentiality concern but not destructive or operationally hazardous.
From the tool's definition Tool name 'source_guide' and description 'Get the AI-generated guide' indicate a retrieval operation. The verb 'Get' and the read-only nature of retrieving a pre-generated summary with no modification of underlying data confirms this is a Read operation.
Attacks that exploit this kind of access
Get the AI-generated guide (summary + key topics) for a source. It is categorised as a Read tool in the NotebookLM MCP Server MCP Server, which means it retrieves data without modifying state.
Register the NotebookLM MCP Server MCP server in PolicyLayer and add a rule for source_guide: 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 Server. Nothing to install.
source_guide 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 source_guide 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 source_guide. 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.
source_guide is provided by the NotebookLM MCP Server MCP server (pavelguzenfeld/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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