Get AI-generated source summary with keyword chips.
AI agents call source_describe 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 performs a read-only operation: it retrieves or queries information about a source and returns an AI-generated summary with keyword metadata. There are no side effects, no data modification, no code execution, and no irreversible actions. The blast radius of misuse is minimal—an attacker could only view summaries of sources already accessible to the user.
From the tool's definition Tool name 'source_describe' and description 'Get AI-generated source summary with keyword chips' indicate retrieval and presentation of AI-generated metadata about an existing source. No data is created, modified, deleted, or executed—only read and summarized.
Attacks that exploit this kind of access
Get AI-generated source summary with keyword chips. 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_describe: 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_describe 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_describe 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_describe. 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_describe is provided by the NotebookLM MCP Server MCP server (set2374/notebooklm-mcp-archived). 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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