Submit one URL through IndexNow

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

Annotations already declare readOnlyHint=false, destructiveHint=false, idempotentHint=false, and openWorldHint=true, so mutation is implied. The description adds useful caveats: it validates the same-host key file and explicitly states it does not guarantee crawling or indexing. However, with a mutation tool, it doesn't disclose side effects like rate limits, quota impact, or failure behavior beyond the key validation step.

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 two sentences with zero waste. It front-loads the primary action and caveat efficiently. However, it is slightly under-specified for the number of parameters and sibling tools; nominal structure is good.

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 3 parameters, no output schema, and moderate annotations, the description covers the core action and one key caveat (no crawl guarantee). But for a mutation tool among many submit variants, it leaves ambiguity about prerequisites (key validation flow), quota implications, and what success looks like (no output schema to define). Acceptable but not 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 only 33% (only site_url has a description, referencing bing_list_sites). The description adds the distinction that url must be 'public' and the change_type values are implicitly enumerated in the description text ('added, updated, or deleted'). It adds some meaning but doesn't clarify the url format expectations or how change_type affects behavior beyond echoing the enum.

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 clearly states the action: 'Validate the same-host key file and notify IndexNow about one added, updated, or deleted public URL.' It names a specific verb+resource (notify IndexNow) and lists the URL statuses. However, it doesn't explicitly distinguish from sibling indexnow_submit_urls (batch version) beyond the implied 'one' vs plural, which is a minor gap.

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 description implies usage by listing the URL statuses (added/updated/deleted) and states it doesn't guarantee crawling or indexing, which sets expectations. However, there are many sibling submission tools (bing_submit_url, bing_submit_url_batch, bing_submit_sitemap, indexnow_submit_urls, indexnow_validate_key) with no explicit when-to-use-this-vs-alternatives guidance, and no relation to the prerequisite bing_list_sites/validate_key flow is stated.

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