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 covered. The description goes further by enumerating what the comparison returns (score /100, security verdict, unpatched vulnerabilities, per-category detail, installs, last update, user rating) and by scoping the tool to reliability rather than features, which is genuinely additive given no output schema.

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?

Front-loaded with the verb and the comparison target, then a compact enumeration of the returned metrics. It is dense but every clause carries information; the only redundancy is the count range already present in the schema.

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 usefully enumerates the returned metrics, and the input contract is fully covered by the schema. What remains missing is routing guidance against the sibling security/audit tools, which is a modest gap rather than a blocking one.

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?

With a single parameter and 100% schema description coverage, the schema already documents the slug array, its example format and the 2-4 item bounds. The description restates the count range but adds no format or syntax detail beyond the schema, so the baseline 3 applies.

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 (compare) and resource (2-4 WordPress plugins from the wordpress.org directory) and even clarifies the evaluative lens with 'Mesure la fiabilité, pas les fonctionnalités'. It is distinguishable from most siblings, though it never names the closely related verifier_securite_plugin, which a single-plugin security check would plausibly overlap with.

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 '2 à 4 plugins' bound implies the comparison use case, but there is no explicit when-to-use statement or exclusion versus alternatives like verifier_securite_plugin or auditer_agent_readiness. Usage is inferable but not spelled out.

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