update_drive_permission

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

With no annotations, the description must convey behavioral traits. It discloses the dry_run parameter and its default (True), implying a safety preview. However, it does not mention required permissions, idempotency, side effects, or error handling, which are critical for a mutation tool.

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 a brief intro followed by a parameter list. It is concise yet covers all necessary details. Minor verbosity in parameter descriptions could be trimmed, but overall it is clear and direct.

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's complexity (6 parameters, mutation, output schema exists), the description adequately explains parameters and the dry_run feature. However, it omits prerequisites (e.g., ownership or edit permissions), error conditions, and does not leverage the output schema to clarify return values. The coverage is sufficient but not thorough.

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 carries full burden for parameter meaning. It provides clear explanations for all 6 parameters, including the role values ('reader', 'commenter', 'writer'), expiration_time format, and the dry_run behavior. This adds significant value beyond the bare schema.

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 (updates) and resource (existing permission on a Drive file/folder). It is specific enough to distinguish from sibling tools like share_drive_file or remove_drive_permission, but does not explicitly differentiate from similar update tools.

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 is provided on when to use this tool versus alternatives (e.g., share_drive_file for adding permissions, batch_share_drive_file for bulk operations). The description does not mention prerequisites or exclusions, leaving the agent to infer usage from context.

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