notebooklm_add_source

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

The description describes adding/uploading a source into a notebook, which mutates the notebook's state, while annotations declare readOnlyHint=true. Even against the lower bar set by having annotations, this is a direct inconsistency, so no credit is warranted.

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?

A single well-formed sentence with the action front-loaded and no filler. It is appropriately sized, though a brief clause about the resulting effect would still fit without bloat.

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 that mutates a remote notebook there is no output schema and the description omits the expected effect (indexing, return value), size or format limits, and whether the target notebook must pre-exist. The contradicting annotations leave the agent without a reliable behavioral picture.

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?

Schema description coverage is 100%, so notebook_id, file_path and title are already documented; baseline 3 applies. The description adds marginal value by enumerating accepted file formats for file_path, but provides no detail on ID format or path resolution.

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?

States a specific verb ("Sube") and resource ("archivo local ... como fuente documental") with a clear target ("cuaderno de Google NotebookLM"), and names accepted file types (PDF, escrito judicial, Markdown). An agent can distinguish it from notebooklm_list_notebooks or notebooklm_create_notebook, though it doesn't explicitly contrast with those siblings.

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?

No guidance on when to use this versus the alternatives (create_notebook, query, list_notebooks) and no stated prerequisites such as the notebook needing to exist first. The only usage signal is implicit in the accepted file types.

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