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

Annotations already declare destructiveHint=true, idempotentHint=false and openWorldHint=true, so the safety profile is covered. The description adds the verified-key and same-host constraints, but omits what 'destructive' means in practice (external submission to third-party engines), any rate/batch limits, and the preview-first safeguard.

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?

Two sentences, zero filler, with the action and its target front-loaded before the constraints. Every clause carries information an 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?

Covers purpose and prerequisites, and annotations handle the safety profile, so the core is present. For a destructive, non-idempotent external submission with no output schema, however, it leaves out what a successful or failed submission looks like and any batch/rate constraints.

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 coverage is 100%, so the baseline is 3, but the description adds a real constraint not in the schema: all URLs must share the site's host, which governs how the urls array is populated. It does not explain the confirm_token preview/submit semantics, which the schema already handles.

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 ('Push'), the resource ('URL batch'), the target service family (IndexNow, with the search engines named), and the scoping unit ('for a site'). No sibling tool overlaps with search-engine submission, so the agent can identify it immediately.

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 hard prerequisites (an existing verified IndexNow key, URLs sharing the site's host), which is genuinely useful, but says nothing about when to prefer this over other actions or about the preview-then-submit workflow — that distinction lives only in the confirm_token schema description.

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