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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile is fully covered without the description. The description adds only the optionality of filtering; it says nothing about ordering, pagination, or how the two filters combine.

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?

One front-loaded sentence with no filler. Every clause (what it lists, what can be filtered) carries information.

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?

The tool is simple and ships an output schema plus rich annotations, so most burden is off the description. Still missing is the semantics of combining the two optional filters and whether an unfiltered call returns everything, which matters because both filters are optional.

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 0%, but both parameters are closed enums whose accepted values are self-documenting in the schema. The description adds that filters are optional and that product takes a canonical product ID, but does not clarify AND/OR combination or default behavior when status is omitted.

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+resource: 'List registry capabilities'. It contrasts implicitly with the singular sibling get_capability and the broader get_catalogue, so an agent can tell it returns a collection rather than one entry. No explicit sibling differentiation is made in text, keeping it at 4.

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?

'Optionally filtered by canonical product ID and status' implies when the filters apply and that both are optional, but there is no statement of when to prefer this over get_catalogue or match_capability_to_intent, nor any exclusion guidance.

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