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

With no annotations supplied, the description carries the burden and delivers meaningful operational context: the site-side key-file requirement and the 100-URL cap. It still omits error behavior (e.g. what happens on invalid key or over-limit) and whether results are per-URL, but the disclosed constraints are genuinely useful.

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?

A single sentence that front-loads the core action and appends the prerequisite and limit in parentheses with no wasted words. Appropriately sized for the tool's simplicity.

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?

The premise and quota are covered, but with 0% schema coverage and no annotations, host and keyLocation remain entirely unexplained, and there is no output schema to describe per-URL submission results. Adequate but with clear gaps for a 4-parameter tool.

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 4 parameters, so the description must compensate. It implies the urls array is capped at 100 and that key relates to a hosted key file, but says nothing about host or the keyLocation parameter, leaving half the parameters undocumented in both places.

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?

Names a specific action (notify search engines via IndexNow), the affected resource (updated URLs), and the concrete engines (Bing, Yandex, Naver). This is clearly distinguishable from siblings like search_submit_guide (a guide) or build_search_urls (a URL builder).

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?

States the key prerequisite (a key file must already be hosted on the site) and the constraint (max 100 URLs), which tells the agent when this call is valid. It does not, however, contrast itself with sibling tools or explain failure conditions, so it stops 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.