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

Annotations already cover the safety profile (readOnly, idempotent, non-destructive, closed-world). The description adds scope semantics beyond that: only jurisdictions with *published* skills are returned, plus what each entry contains (counts and named lead accountant). It doesn't mention result size or any limits, but for a no-argument read tool this is solid added context.

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 dense sentences with zero filler, the trigger question leading and the payload described second. Every clause carries information an agent can act on.

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 an output schema present, return-value structure needn't be explained, yet the description still summarizes the payload shape (code, skill count, reviewed count, lead accountant). Nothing an agent needs to invoke this zero-arg, read-only listing tool is missing.

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 the baseline is 4; there is nothing for the description to disambiguate beyond confirming it is argument-free.

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 and pins down the exact scope: "Returns every jurisdiction with published skills," including the code formats (ISO 2, US-XX, Canadian provinces). It is clearly separable from the list_skills/search_skills siblings, which operate on skills rather than coverage geography.

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?

Frames usage around two concrete user questions ("which countries do you cover?", "what is there for [country]?"), which is a clear trigger context. It does not, however, name alternative tools or state when NOT to use it versus list_skills/search_skills for country-scoped lookups.

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