NotebookLM MCP Server (Security Hardened)

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

While annotations already indicate destructiveHint=true and idempotentHint=true, the description adds significant behavioral context beyond annotations: the critical browser-closing requirement, cross-platform compatibility, safety mechanisms (preview before deletion, explicit confirmation), library preservation option, and detailed workflow guidance. No contradiction with annotations exists.

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 well-structured with clear sections (warning, categories, platform info, preservation option, workflow, use cases). While comprehensive, some sentences could be more concise (e.g., the category list is detailed but necessary). The critical information is front-loaded with the warning and purpose statement.

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 tool with no output schema, the description provides complete context: clear purpose, detailed behavioral guidance, parameter usage examples, platform compatibility, safety mechanisms, prerequisites, and specific use cases. It compensates for the lack of output schema by explaining what happens during execution (preview then deletion).

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 baseline is 3. The description adds meaningful context about parameter usage: it explains the two-step confirmation workflow, provides specific recommended values (preserve_library=true), and clarifies the library preservation behavior. However, it doesn't add syntax or format details beyond what the schema already documents.

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 tool's purpose: scanning and cleaning NotebookLM MCP data files across 8 specific categories. It uses specific verbs ('scans entire system', 'shows categorized preview before deletion') and distinguishes itself from sibling tools by focusing on data cleanup rather than notebook/source management, authentication, or content generation.

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 explicit usage guidelines including when to use ('Clean reinstall, troubleshooting auth issues, removing all traces before uninstall'), prerequisites ('Close ALL Chrome/Chromium instances BEFORE running'), a recommended workflow with specific parameter values, and clear alternatives (preserve_library=true option). It also distinguishes when NOT to use it (when browsers are open).

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