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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=false, so safety is covered; the description adds the authentication requirement and enumerates the returned fields (plan, montant, rythme, statut, prochaine échéance, échéances payées), which is valuable since there is no output schema. It omits ordering, default result size and whether 'limite' truncates the list, leaving a minor gap.

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 compact sentences: the authentication prerequisite is front-loaded, followed by the data scope. Nothing is padded, though the enumeration of output fields sits awkwardly close to the unmentioned 'statut' filter param.

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 read-only, zero-required-parameter listing tool with no output schema, the description adequately covers audience, auth and returned fields. It would be complete with a note on pagination/default limit and on what the status filter does.

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 neither parameter is explained: 'limite' (1–50) and the 'statut' enum (active/pending/cancelled) appear only as bare types. The description mentions a 'statut' field among the returned data, which may confuse the agent about whether it is a filter or an output, and adds nothing about the limit's default or effect.

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 (subscriptions with plan, amount, rhythm, status, next due date, paid installments) and scopes it to either the logged-in individual or a merchant's clients. The verb is implicit (it reads as a listing) and there is no explicit differentiation from look-alike siblings such as mes_prelevements or mes_ventes, so it stops short of a 5.

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 gives one real prerequisite: a Tchin login is requested the first time, which tells the agent the call can trigger an auth flow. Beyond that, usage is only implied — no statement of when this is preferred over mes_prelevements, mes_ventes or bilan_compte, and no exclusions.

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