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

Annotations already declare readOnly, idempotent, non-destructive and closed-world, so the safety profile is covered. The description adds genuinely new behavior: the call is free, it returns a link where the owner launches the preview, the preview is built from the owner's own content, and it completes 'en quelques minutes'. It still omits error paths (e.g. what happens for a non-Wix/WordPress URL) and any auth requirement.

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 action and its output before the audience qualifier, with no filler. The audience enumeration is slightly long but does real routing work.

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 correctly explains what comes back (the preview link) and the turnaround; with annotations and a fully documented two-parameter schema, little else is required. Missing only failure/precondition handling for unsupported site platforms.

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 100% and the enum on formule is fully documented in the schema, so the baseline is 3. The description adds only 'à partir de son adresse' for url and a loose hint of 'site seul' vs 'complet'; it contributes no syntax or format detail beyond the schema.

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 names a concrete verb (prépare la refonte) and a concrete resource (un site vitrine Wix ou WordPress) plus the input it works from (son adresse) and the artifact it returns (le lien de l'aperçu). It is clear enough to separate from siblings like preparer_creation given the strong emphasis on an EXISTING site, though it never names those siblings 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 sketches the intended audience and pain points (artisan, commerçant, petite entreprise dont le site est daté, lent, mal adapté au téléphone, ou trop cher chez Wix), which implies when the tool fits. However there is no explicit when-not and no comparison to preparer_creation / decrire_offres, so the agent must infer the selection rule.

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