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

Annotations already declare readOnlyHint and openWorldHint, so the safety profile is covered. The description adds real behavioral context beyond that: it validates hosting rules, exercises URL path routing, and reaches out to Apple's CDN to diff the origin AASA against Apple's copy (consistent with openWorldHint). It stops short of describing auth needs, limits, or what a failure verdict looks like.

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 front-loaded sentence with no filler, but it chains several "and ... and ..." clauses, which slightly blurs the scan order of the checks being performed. Efficient overall.

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 read-only diagnostic with no output schema, the description enumerates the validation targets well but never indicates what the result looks like (pass/fail per artifact, list of routing problems, CDN mismatch details) or how a caller should act on it. Adequate but with a clear gap where return semantics should be.

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%, so both parameters are already documented; baseline is 3. The description only faintly reinforces test_url via "test URL path routing" and adds no format or routing-syntax detail beyond the schema.

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?

Specific verbs ("inspect and validate") paired with named resources (Apple App Site Association, Android Digital Asset Links / assetlinks.json) plus the exact checks performed (HTTPS hosting rules, URL path routing, origin-vs-CDN comparison). No sibling in the list overlaps this universal-link/app-link validation surface, so an agent can select it unambiguously.

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 when the tool is relevant (a domain that hosts AASA/assetlinks files), but never states when to use it versus alternatives or any prerequisites/exclusions. Usage must be inferred from the resource names alone.

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