NotebookLM MCP Server (Security Hardened)

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

The description adds valuable behavioral context beyond annotations by warning about potential user impact ('Ask before closing if the user might still need it'). Annotations already indicate destructiveHint=true and idempotentHint=true, but the description provides practical usage advice that enhances understanding of the tool's consequences.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is perfectly concise with two clear sentences that each serve distinct purposes: the first states the core functionality, the second provides crucial usage guidance. There's no wasted language or redundancy.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a destructive operation with good annotation coverage (destructiveHint, idempotentHint) but no output schema, the description provides adequate context about the action and important usage considerations. The main gap is lack of information about what 'closing' actually means behaviorally or what happens after closure.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

With 100% schema description coverage, the input schema fully documents the single 'session_id' parameter. The description doesn't add any additional parameter information beyond what's in the schema, so it meets the baseline expectation without providing extra value.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the specific action ('Close') and target resource ('a specific session by session ID'), distinguishing it from sibling tools like 'list_sessions' or 'reset_session'. It provides a precise verb+resource combination that leaves no ambiguity about what the tool does.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides clear contextual guidance with 'Ask before closing if the user might still need it', which helps determine when to use this tool. However, it doesn't explicitly mention alternatives like 'reset_session' or specify when-not-to-use scenarios, preventing a perfect score.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.