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

Annotations already cover the safety profile (openWorldHint=true, destructiveHint=false), and the description usefully adds that the tool crawls live as multiple identities, takes 5-15 seconds, and reports whether the origin refused CrawlCheck. It does not explain why readOnlyHint is false for what reads like a read-only scan (e.g. whether it records telemetry or touches the origin), which is the one behavioral gap an agent would care about.

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 tight sentences, front-loaded with the action and scope, then the payload of the result. The enumeration of return fields is long but informative rather than redundant, so it earns its space.

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, the description compensates by enumerating the returned record (grade, AI-visibility score, per-section scores, findings with evidence, CrawlCheck refusal) and disclosing latency. Missing only failure/error behavior and what 'grade' scales mean, which are minor for a single-parameter scan.

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 100% and the single 'domain' parameter is fully documented in the schema (bare domain or full URL), so the baseline is 3. The description adds nothing beyond the schema about the parameter's accepted forms.

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 ("Scan a public domain") and names the mechanism ("as several crawler identities") plus the artifact returned ("the graded record: grade, AI-visibility score, per-section scores..."). An agent can tell this is the broad triage/audit scan rather than a narrow resolver like resolve_domain, but the description never explicitly contrasts itself with the many sibling tools.

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?

Usage is only implied: 'public domain' is the sole scoping constraint, and the latency note hints this is a heavyweight operation. There is no statement of when to prefer scan_domain over preflight, crawler_path, or field_check, and no prerequisites or exclusions are given.

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