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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint and destructiveHint=false, so the safety profile is fully covered externally. The description adds genuinely useful context beyond them – that the result includes each service's languages and reference prices in euros – but says nothing about result size, completeness guarantees or how a consumer should page/iterate over the catalogue.

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, front-loaded with the verb and resource, with no filler. The long parenthetical enumeration of service names is informative but heavy, making the sentence harder to scan than a short list would be.

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 must convey what comes back, and it does specify services, their languages and euro-denominated reference prices. For a zero-parameter, read-only catalogue tool this is largely sufficient, with only result shape/ordering left 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, so there is nothing to disambiguate and the baseline of 4 applies. The description correctly implies an unfiltered full dump rather than a parameterized query.

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 ("Liste") and a scoped resource ("tous les services de Psychologie & Sérénité"), then enumerates the concrete service types so the agent knows exactly what catalogue is covered. The plural/whole-catalogue framing implicitly separates it from the singular sibling describe_service, though it never names that sibling.

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 explicit when-to-use or when-not guidance and no reference to alternatives such as describe_service for per-service detail. The agent must infer from the plural verb that this is the entry-point catalogue lookup, which is implied at best.

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