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

Annotations declare a non-read-only, non-destructive, closed-world mutation, and the description usefully adds that only pending messages in validation mode are affected and that explicit client consent is required first. It does not say whether approval immediately dispatches the messages or merely marks them queued, nor what happens to ids that are not in pending state — the key behavioural question for an approval tool.

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 dense sentence, correctly front-loaded with the action and the resource; nothing is padded. It loses a point for being written in French while the tool name, title, and annotations are English, and for burying the real precondition in a trailing subordinate clause.

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?

For a mutation tool with zero schema description coverage and no output schema, the definition is thin: it does not state the outcome of approval (send now vs. schedule), reversibility, or partial-failure behaviour across a 200-id batch. The only filling gaps are the mode restriction and the consent prerequisite.

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 parameter `ids` carries no description, so the description had to compensate and does not. It only implies a batch of pending messages via the plural "des messages"; the 1–200 item array bound, integer type, and the requirement that ids refer to pending records are never stated.

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 ("Valider") and resource ("messages directs en attente"), plus the mode restriction ("mode validation"). An agent can tell this is an approval action on pending DM drafts, but the description never distinguishes it from the sibling queue_outreach_messages, which is the closest neighbour.

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 parenthetical "mode validation" and the prerequisite "après accord explicite du client" give real conditions for invocation, which is more than nothing. But there is no explicit when-not guidance, no mention of queue_outreach_messages as the upstream alternative, and no indication of how to discover that a message is actually pending.

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