bing_children_url_traffic_info

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

Annotations already declare readOnly/idempotent/non-destructive, so the safety profile is covered; the description goes further and discloses the empty-response semantics ('empty_response label: that is silence, not a measurement') and an untrusted-data handling rule. These are genuine behavioral facts not derivable from structured fields. It stops short of describing pagination behavior despite a page parameter, so it is not flawless.

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?

Four tight sentences, each doing load-bearing work: purpose, trigger, exclusion-with-alternative, and two behavioral caveats. The primary purpose is front-loaded, and there is no filler or repetition.

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?

With no output schema and no annotation coverage of edge cases, the description compensates by explaining the empty_response label and the untrusted-field rule, which are exactly the gaps an agent would otherwise mishandle. The only residual gap is the undocumented param semantics (url vs site_url, page), so it is strong but not fully complete.

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% across three parameters, so the description carries the full burden, and it does not explain the crucial distinction between 'url' and 'site_url' or what 'page' does. The phrase 'child URLs under one URL' hints at the url parameter but leaves site_url ambiguous. It adds little meaning beyond what a bare schema already shows.

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 ('List Bing search-traffic records for the child URLs under one URL') and immediately delimits against the nearest sibling by naming bing_children_url_info as the crawl-status tool. An agent can distinguish it from bing_url_traffic_info and bing_children_url_info 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 an explicit positive trigger ('Use when the user asks which paths under a URL get Bing traffic') and an explicit exclusion with the correct alternative ('Do not use this for the children's crawl status; call bing_children_url_info'). Both when-to-use and when-not-to-use are covered, leaving nothing to inference.

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