Verify ownership

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

Annotations already cover safety (idempotentHint=true, destructiveHint=false, openWorldHint=true), so the bar is lower; the description adds real value by disclosing the failure mode (fails until the token is reachable) and the expected delay for DNS propagation. It does not describe error/return shape or rate limits, so not a 5.

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?

Three short sentences, front-loaded with the action and its prerequisite, then failure/timing behavior. 'Retrying is safe' slightly duplicates the idempotentHint annotation, but overall it is tight and every sentence carries weight.

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?

Covers the prerequisite, external side effect (Google fetches and marks ownership), and the timing/failure behavior an agent needs, with parameters fully documented in the schema and no output schema to explain. It lacks only error-surface detail (what a failed verification returns).

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%, including inline docs for type, method, identifier and account, and enum values are documented. The description adds no parameter-level detail beyond the schema, so the baseline 3 applies.

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 concrete verb+resource (claim ownership of a site via verification) and explicitly ties it to the token produced by the sibling get_verification_token, distinguishing it from list_verified_sites. An agent knows exactly what this does without opening the schema.

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?

Gives a clear precondition (run only once the token is live), names the sibling that mints the token, and warns that DNS verification requires waiting for propagation before retrying. It also states retrying is safe, which resolves the main agent doubt for this call.

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