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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The description adds real value by disclosing the specific subsystems probed (storage, paapi, tag configuration, link mode, marketplace counts) and noting the return shape varies by marketplace configuration. It doesn't mention auth requirements or performance, but for a read-only diagnostic that is minor.

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 short sentences, front-loaded with purpose before the field list, with zero filler. The field enumeration is dense and uses internal jargon (paapi, linkMode) without gloss, which slightly hurts readability but does not waste 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?

There is no output schema, so the description carries the burden of explaining return values and it does list the keys. However, it only names them without saying what values to expect or what a healthy vs. unhealthy response looks like, which is the main thing an agent needs from a health check.

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?

The tool takes zero parameters, so there is no parameter semantics to explain and the baseline is 4.

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?

The description opens with a specific verb+resource ('Health check for Wedding Gift Board') and enumerates what the check reports, so an agent immediately knows this is a diagnostic endpoint rather than a data-mutating or catalog tool. It doesn't name a sibling, but none of the siblings (add_item, browse_catalog, resolve_product, etc.) is confusable with a health check.

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: 'health check' conventionally means 'call this to verify connectivity/configuration before or after other operations.' There is no explicit statement of when to use it, when not to, or what to do with a failing result, and no mention of the other tools it might gate.

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