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

No annotations are provided, so the description carries the burden. It usefully discloses provenance ('horaires et saisons vérifiés sur les sites officiels') and what is returned (créneaux), but it does not state whether results can be empty, how geography/language interact, or return formatting details.

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 sentences, front-loaded with the resource and scope, then the driving question. No filler, though the provenance clause is somewhat dense for the width it occupies.

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 or annotations, the description covers the temporal scope, geography, data source, and return contents (créneaux). It is largely sufficient for a read-only query tool, with only the optional-parameter behavior 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?

Schema coverage is 67%, so baseline is 3. The description echoes the two geographic parameters ('département français ou Land allemand') and frames them as an either/or choice, but adds no detail on the lang enum or on behavior when no parameter is supplied (0 required).

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 states a specific verb+resource+scope: castles in a French département or German Land that are open Saturday or Sunday with their time slots. The temporal qualifier ('ce week-end') clearly distinguishes it from siblings like search_chateaux or list_evenements, though it does not name them explicitly.

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?

It frames the use case via 'Répond à « quel château visiter ce week-end près de … »', which implies a near-me/weekend-planning scenario. However, it gives no explicit when-not guidance or named alternatives (e.g. vs search_chateaux), leaving the agent to infer the boundary.

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