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 genuine new context by disclosing that the response includes linked system classes and sites, i.e. it eagerly expands related resources rather than returning a bare record.

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 sentence, zero filler, with the resource and lookup key front-loaded and the payload expansion noted at the end. Nothing to trim and nothing buried.

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, the description appropriately signals what comes back (the service area plus linked system classes and sites). Minor gaps remain around not-found/error behavior and whether the linked collections are always included, but for a one-parameter read tool this is nearly sufficient.

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% and the single id parameter is documented as a UUID-format service area ID in the schema itself. The description only restates 'by ID' and adds no format, lookup, or fallback detail beyond the schema.

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 (get) and resource (service area) with the lookup key (ID) and singular scope, which distinguishes it from list_service_areas and the create/update/delete_service_area siblings. It stops short of naming an alternative sibling explicitly, so it lands at a clear-but-not-routing 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?

The 'by ID' phrasing implies the retrieval-by-identifier use case, but there is no explicit when-to-use guidance, no statement about when to prefer list_service_areas versus this tool, and no mention of behavior on a missing/unknown ID.

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