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

The annotations already declare this is non-read-only, non-idempotent, open-world, and destructive, so the description need not restate those traits. The description adds useful context that a verification must have been started and that the code comes from Google, but it does not explain what is destructive, what happens on a wrong code, or what state changes on success.

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 a single front-loaded sentence with no wasted wording. It puts the completion action and the required Google-sent code immediately in view.

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 four-parameter mutation tool with annotations and no output schema, the description is adequate to identify the operation and prerequisite. It still leaves gaps around the verification parameter and the practical meaning of the destructive hint, so an agent lacks some detail needed to call it confidently in edge cases.

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?

The description clarifies that the supplied code is the one Google sent the owner, which gives meaning to the otherwise undocumented pin parameter. However, the verification parameter remains unexplained, and the description does not add much beyond the schema's existing site_id and user_goal descriptions.

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 states a specific verb and resource: 'Complete a started verification' with the Google-sent code. The word 'started' distinguishes it from start_google_verification, and 'complete' distinguishes it from get_google_verification.

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 phrase 'a started verification' clearly implies the prerequisite that start_google_verification must already have been called. It does not explicitly name alternatives or say when not to use this tool, so it falls short of full when/when-not guidance.

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