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 without the description. The only added context is the 'ouverte' qualifier; nothing is said about behavior on a closed or missing session, nor about what is returned.

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?

A single short, front-loaded sentence with no filler. Its brevity borders on under-specification rather than padding, which is the right failure mode for a simple read tool but leaves little to work with.

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?

No output schema exists, so the description should convey what a successful read returns (session shape, status) or what happens when the session is not open. With nested parameters and no return-value information at all, an agent cannot predict the result of calling it.

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% for 2 parameters, so the description must carry the burden. 'Par son identifiant' clarifies that the nested booking.id is the lookup key, but the 'meta' object is never mentioned and the id's format (string/UUID) and the nested structure are left unexplained.

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 ('Relit') and resource ('une session de réservation'), scoped to the open session identified by its id. It is reasonably distinguishable from create_booking_session and update_booking_session, but never names those siblings to make the boundary explicit.

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 description gives no when-to-use context, no prerequisites, and no alternative tools. The word 'ouverte' implies a constraint (only open sessions), but it is not stated as guidance and no sibling is referenced.

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