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

No annotations are provided, so the description carries the burden of behavioral disclosure. It does state the core action (closing a session) and the return payload (distilled lessons), but it does not mention prerequisites (e.g., session must be active), reversibility, permission requirements, or failure behavior. This is a partial disclosure for a state-changing tool.

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?

One short, front-loaded sentence states the action and the return value with no wasted words. It is appropriately concise for a simple one-parameter tool.

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 simple tool with one parameter and an output schema, the description covers the basic action and result. However, it lacks usage context, state prerequisites, and error/edge-case behavior, which an agent might need to invoke it correctly in all situations.

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?

The only parameter, session_id, is self-evident from its name and the description's reference to closing a session, but the description adds no explicit detail about format or constraints. Since schema description coverage is 0%, the description should have compensated by explaining the parameter's role; it does not.

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 uses a specific verb ('Clôture'), a resource ('une session'), and states the distinctive output ('renvoie les règles distillées (leçons)'). This makes it immediately clear what the tool does and differentiates it from siblings get_session_status (status check) and start_regulation_session (session creation/start).

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 description clearly implies usage at the end of a session (closing/finalizing and retrieving lessons). It does not explicitly name alternatives or state when not to use it, but the context is unambiguous enough that an agent can infer the appropriate time to call it.

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