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

Annotations already flag openWorldHint and destructiveHint, and the description adds real context beyond them: the max 10,000 URL batch, the single-domain constraint, the spam-reputation risk of repeated submissions, the failure mode error=key_file_missing with guidance, and crucially the semantics of a successful response (accepted means reported, not indexed).

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?

Dense and front-loaded — the core action and target engines come first, then constraints, prerequisites and return semantics. Slight redundancy: the return fields (submitted, status, note) are spelled out even though an output schema exists, and the Google parenthetical is longer than strictly necessary.

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 two-parameter write tool with no schema descriptions, the definition covers everything an agent needs: limits, domain scope, prerequisite key file, error case, return semantics and the naming/search distinction. Nothing required to call 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?

Schema coverage is 0%, so the description has to carry both parameters, and it does: urls must be full URLs from a single domain, capped at 10,000, with new/changed-only guidance; workspace is a customer workspace slug and optional when only one workspace exists. Remaining gap is url format edge cases (scheme, host matching, wildcards), so not a full 5.

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 (melden/submit) and resource (neue/geänderte Seiten per IndexNow) and names the exact engines reached and the one that is not (Google). It also routes to the correct siblings (sc_submit_sitemap for Google, site_indexnow_key for the key file), so an agent can distinguish it from bing_submit_urls or sc_submit_sitemap 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?

Explicit when-to-use (after publishing a new or changed page), when-not (repeatedly resubmitting the same URLs looks like spam), prerequisite ordering (key file must already be online, obtained via site_indexnow_key), and the alternative for Google. This is the full when/when-not/alternative triad.

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