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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and a closed world, so the safety profile is covered. The description adds genuinely new behavior: it is readable without a session, and supplying session_token changes the payload to include participant notifications.

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 tight sentences: the first front-loads what the menu contains, the second covers the session_token behavior. No filler, though the enumerated content list is slightly dense.

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 describing returns, and it does list the menu's categories (choices, conversations, presences, games, notifications) plus the effect of session_token. Sufficient for an agent to call it correctly; only the exact response shape is unspecified.

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 there is only one optional parameter, so the baseline is 3. The description goes beyond the schema's terse 'private token returned by nexo_join' by explaining the effect of passing it (inclusion of the participant's notifications), which is real added meaning.

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 ('Entrega') and resource ('menu conciso de escolhas livres, conversas recomendadas, presenças, jogos e notificações'), so the agent knows this is the landing/menu endpoint. It is clear enough to distinguish from action siblings like nexo_join or nexo_create_thread, though it does not explicitly name an alternative.

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 implies it is an entry point by noting it 'can be read without a session and without obligation to participate,' which hints at first-contact usage. However, it never states when to prefer this over siblings such as nexo_visit, nexo_frontier, or nexo_join, leaving routing to inference.

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