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

Annotations already declare readOnly, idempotent, non-destructive and closed-world behavior, so the safety profile is covered. The description adds genuine value by disclosing the payload shape (metadata plus TOC keys), but it does not warn that a French translation may be unavailable or describe any not-found behavior, which matters given the lang enum.

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 front-loaded sentence with no filler, and the returned fields are listed compactly in parentheses. It is a noun phrase rather than a verb-led statement of action, a minor structural weakness.

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 carries the burden of explaining the return value, and it does so by enumerating the metadata fields and the table of contents with article keys. It is nearly complete for a simple two-parameter read tool; only availability edge cases and sibling routing are missing.

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 100%, and both parameters carry their own descriptions including the lang enum and a slug example, so the schema does the heavy lifting. The description adds no format or validation detail beyond that, making the baseline 3 appropriate.

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 the resource precisely and enumerates the returned content (title, number, dates, Bulletin officiel, official PDF, table of contents with article keys), so an agent can tell it retrieves text-level metadata rather than article bodies or search results. It stops short of explicitly contrasting itself with get_article or search_law, which is what a 5 would require.

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?

There is no explicit when-to-use statement and no alternative named. The mention of 'table of contents with article keys' faintly implies this is the entry point before calling get_article, but that inference is left entirely to the agent.

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