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

Annotations already declare readOnly, idempotent, non-destructive and closed-world, so the safety profile is covered. The description adds meaningful context beyond them: that the endpoint is callable without a key and requires the catalog:read permission, which tells the agent it can be invoked pre-authentication.

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?

Compact and front-loaded: the resource is stated first, then practical caveats (no key, permission scope). Every clause carries information, though the parenthetical permission note at the end is slightly buried and the region list is only an example, not exhaustive.

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 no output schema and no parameters, the description should say something about the returned shape (e.g. region identifiers/codes and country fields) so an agent can chain it into create_server or quote_server. It covers auth and scope but leaves the return contract entirely unspecified.

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 and the schema is an empty object, so there are no parameter semantics to clarify; the baseline for a no-param tool is 4. The description correctly implies the call is parameterless and returns a fixed catalog.

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: regions where GPU servers can be deployed, with a concrete example (Montréal, Canada) that makes the resource unambiguous. 'Regions' is unique among the list_* siblings, so no explicit sibling differentiation is needed, though the description never confirms this is a global, account-independent catalog.

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?

Gives useful situational context ('works without a key', public catalog prices) that tells the agent this call needs no authentication, but offers no explicit when-to-use guidance or routing versus siblings such as list_products or get_stock, which an agent may confuse when looking for deployment locations.

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