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

Annotations already declare readOnlyHint=false, idempotentHint=true, destructiveHint=false, and openWorldHint=true. The description adds real behavioral context beyond that: the failure mode (Bing may not find the proof yet), the propagation timing (minutes to an hour), the retry path, and an authorization prerequisite. It stops short of describing rate limits or the exact result payload, keeping it at a strong 4.

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 sentences, front-loaded with the action, then the failure/timing caveat, then the prerequisite. No repetition of the title or schema, and each sentence carries information the agent needs.

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 one-parameter, idempotent, non-destructive operation with no output schema, the description covers action, prerequisite, failure mode, and retry guidance. Nothing needed to invoke it correctly is missing.

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?

Only one parameter and schema description coverage is 100%, so the schema already documents siteUrl's format and origin. The description only implies 'for a site' and points back to bing_add_site, adding no syntax or format detail beyond the schema. 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 specific verb and resource ('check the ownership proof ... and mark it verified') and names the prerequisite artifact source (bing_add_site), so an agent can separate this from bing_add_site, bing_list_sites, or bing_inspect_url without opening any 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 clear context: it is used after bing_add_site, and if proof is not yet visible the agent should wait and retry. It also states a prerequisite ('Requires changes to be allowed on the Bing connection in Caybl.ai'). It does not name an alternative tool, but no sibling performs verification, so the gap is minor.

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