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

Annotations already declare readOnlyHint, destructiveHint=false and openWorldHint=false, so safety is covered. The description adds real behavioral detail beyond that: unknown slugs go to an 'unknown' field and the rest of the call still succeeds, plus the 81-item cap and default French locale.

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?

Four tight sentences, front-loaded with the purpose and the id-handling rules; nothing is padded. The 'Same payload as GET /api/v1/providers' sentence is only marginally useful to an agent that never sees the REST surface.

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 two-parameter read tool with full annotation coverage and no output schema, the description covers the important edge cases (partial failure via 'unknown', item cap, ordering, locale default). It stops short of describing pagination or the exact response shape, but that is a minor gap here.

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%, so the baseline is 3, and the description genuinely adds meaning: the 81-slug maximum, order preservation, and how unknown slugs are handled rather than failing the call. The lang default of French largely repeats the schema wording, which caps this below 5.

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 and resource ('List StackLégal provider fiches') and clarifies scope: specific slugs via ids or the full catalog when omitted. It does not explicitly contrast itself with the sibling get_provider (single-provider fetch), so differentiation is only implicit through naming.

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?

Gives clear selection rules: pass ids for specific slugs, omit for the full catalog, with a hard limit of 81 and preserved ordering. It never names get_provider as the alternative for a single record, so the when-not condition is inferred rather than stated.

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