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

Annotations already declare readOnly, idempotent, non-destructive, and closed-world behavior. The description adds a meaningful epistemic caveat (catalogue counts do not prove publication or indexing), which is useful beyond the annotations, but it omits auth requirements, rate limits, or pagination behavior.

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 with no filler; the catalogue scope is front-loaded and the caveat follows efficiently. It is appropriately sized, though the second sentence is slightly opaque and could be clearer without adding length.

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?

An output schema exists, so return values need not be explained. However, the description still omits the tool's actual output semantics, how city_id affects coverage, and when to prefer it over sibling tools, leaving the agent under-informed for invocation.

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%, and the single optional city_id parameter is never mentioned in the description. An agent cannot learn from the description what city_id does, what happens when it is omitted, or that it expects a French postal code pattern.

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 identifies the domain (national catalogue of Callejear.fr and source limits) but uses a noun phrase rather than a clear verb+resource. It does not state what the tool actually returns (coverage counts, list of covered communes, etc.) and gives no basis for distinguishing it from siblings like search_communes.

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?

There is no when-to-use guidance, no mention of alternatives, and no conditions that select this tool over the sibling search/compare tools. The caveat about counts not proving publication is a data-quality note, not usage direction.

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