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

Annotations indicate readOnlyHint=false and destructiveHint=false, implying mutation but not destruction. The description adds that type auto-detection occurs and bulk execution is supported, but does not disclose other behavioral traits such as permission requirements or side effects beyond what annotations provide.

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 two sentences long, front-loaded with the main action and variants, and every sentence adds value. No wasted words.

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 tool with 5 parameters, no output schema, and low schema coverage, the description covers the essential aspects: type handling, title usage, and bulk support. It is reasonably complete for an add operation, though it could mention input constraints or error conditions.

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?

Despite 0% schema description coverage, the description adds significant meaning: it clarifies that type is auto-detected, advises using type:'text' + title for text input, and explains that notebook_ids enable bulk execution. This compensates for the schema gap.

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 action (adds a source), the resource (notebook), and distinguishes between types (URL, YouTube, text). It also mentions bulk support, differentiating it from other source tools like notebooklm_source_add_research.

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 some guidance on when to use type:'text' + title for pasting text and mentions bulk support. However, it does not explicitly state when not to use this tool or compare it to alternatives like notebooklm_source_add_research, leaving usage context somewhat implied.

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