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

With annotations only declaring non-readonly, non-idempotent, non-destructive (all consistent with a creation operation), the description carries valuable extra behavior: OCPP connection under a minute, periodic self-charging, full command response including a realistic 20-second disconnection on Reset, bundled RFID cards, a 409 response at the cap, and a teardown endpoint. This substantially enriches the agent's mental model of what the sandbox chargers will do. No contradiction with annotations.

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?

The description is longer than average (roughly 90 words) but every clause is information-dense and earns its place: purpose, connection behavior, command/reset semantics, RFID naming, quota with error code, teardown route, and intended use. It is front-loaded with the primary purpose and the behavioral details follow logically. It could be trimmed slightly, but there is no filler.

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 tool with behavioral side effects (self-charging, reset behavior) and no output schema, the description is notably complete: it explains creation behavior, the quota failure case (409), how to remove the chargers, and when to use it. Minor gaps remain (no explicit mention of the success response shape or of the location_name influencing anything), but an agent can correctly invoke and interpret this tool with the information given.

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 100%: both parameters (count 1–10 default 5, location_name with a Spanish default) are already fully documented in the input schema. The description adds only the 'Máximo 10 por marca' constraint, which slightly reinforces the count upper bound but introduces no fundamentally new parameter semantics. Baseline 3 is appropriate because the schema already does the heavy lifting.

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 opens with a specific verb-resource pair ('Da de alta cargadores simulados en la marca') and immediately frames the purpose as testing without hardware. It is cleanly distinguishable from the sibling askacharge_crear_cargador (real chargers), because the 'simulados' qualifier and 'sin hardware' context make the sandbox scope explicit. The resource, brand scope, and what the chargers do are all stated.

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 ends with an explicit directive: 'Úsalo para ensayar comandos y webhooks antes de tocar un cargador real', which tells the agent exactly when this tool is the right choice. It also mentions the removal path via DELETE /api/brand/sandbox and the 10-per-brand cap, giving operational context. It does not explicitly name a sibling to avoid (e.g., crear_cargador for real hardware), but the sandbox framing makes the intended use unambiguous.

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