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

Annotations already indicate readOnlyHint=false, so the description confirms it is a write operation. But it lacks details about side effects (e.g., overwriting existing permissions), authorization needs, error states, or rate limits. The only added behavioral info is batch support, which is more about usage than transparency.

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 extremely concise with two sentences. The first sentence delivers the core purpose, and the second adds a key feature (bulk support). No redundant or unnecessary 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?

Given the tool has 4 parameters with zero schema descriptions and no output schema, the description is insufficient. It omits parameter details, return values, prerequisites, and error handling. The bulk mention is helpful but not enough for an agent to fully understand the tool's behavior.

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 0%, so the description should compensate. It only explains the 'notebook_ids' parameter for batch operations, but fails to clarify 'email', 'permission' (enum values editor/viewer), and 'notebook_id'. No details on required versus optional behavior.

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 ('Atualiza a permissão de um colaborador') and the resource ('permissão de um colaborador'). It also distinguishes from siblings like notebooklm_share_add and notebooklm_share_remove by focusing on updating existing permissions, not adding or removing them.

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 mentions 'Bulk support: accepts notebook_ids for batched execution,' which hints at when to use batch vs single notebook_id. However, it does not provide explicit guidance on when to use this tool versus alternatives like notebooklm_share_add or notebooklm_share_remove, leaving some ambiguity.

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