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

Annotations already declare readOnlyHint=false, destructiveHint=false and idempotentHint=false, so safety is partly covered. The description adds real value with "No se borra", telling the agent the bet persists after closing rather than being removed, and that failed outcomes are accepted. It does not say whether closing is reversible or whether the bet must currently be open.

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 short sentences with no filler; the core action and the key persistence caveat are both front-loaded. Nothing is repeated from the title.

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 5 parameters, 4 required, no output schema and solid annotation coverage, the definition is roughly adequate, but it omits the relationship to open_bet and whether a closed bet can be reopened or overwritten. Those are the gaps an agent would most likely hit on a second call.

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 80% and the schema already documents bet, project, basis and evidence, so the description only implies that outcome/evidence must reflect reality ("lo que pasó de verdad"). It adds nothing about the outcome enum or the medido/contado distinction, so the baseline 3 applies.

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?

"Cierra una apuesta" gives a specific verb (close) and resource (bet), and "con lo que pasó de verdad" clarifies it records the real outcome. It never names the obvious counterpart open_bet, so the agent must infer the pairing from the sibling list, which keeps it 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?

The clause "también si salió mal" tells the agent to close bets even when the outcome is negative, which is genuine usage guidance but only for one edge case. There is no statement of when-not to call it, no mention that open_bet/archive_project are the alternatives, and no prerequisite such as the bet having to be open.

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