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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the agent knows this is a safe, network-touching read. The description adds which artifacts and rules are checked, which is useful scope context, but says nothing about fetch behavior, failure modes, or whether missing files are reported as errors versus warnings.

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 that enumerates the checked artifacts without filler. Slightly list-like, but every clause carries information and nothing is repeated from the name or schema.

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 two-parameter inspector the description covers the validation scope adequately, but with no output schema it does not indicate what the result looks like (pass/fail per check, diagnostics, etc.), leaving a real gap for an agent deciding how to consume the response.

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 'domain' and 'test_url' are already documented in the schema, including the AASA/exclusion routing purpose of test_url. The description adds no parameter-level detail beyond that, so the baseline of 3 applies.

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 (inspect and validate) plus the exact resources (Apple AASA and Android assetlinks.json files, HTTPS hosting rules, URL path routing). No sibling tool covers universal/app link validation, so it is unambiguously distinguishable from the rest of the list.

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 purpose implies when to use it, but there is no explicit when/when-not guidance, no mention of alternatives (e.g. inspect_domain_security), and no statement about prerequisites such as needing a live reachable domain. Usage is inferable but not spelled out.

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