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

Annotations already declare readOnlyHint=false, destructiveHint=false, idempotentHint=false, and openWorldHint=false, so the safety profile is covered structurally. The description adds that temperature is optional and applies to driver and passenger — useful — but says nothing about auth needs, required vehicle state, or what happens to unspecified zones.

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?

A single compact sentence plus a short example, with the primary on/off action front-loaded and the optional part clearly marked as optional. The parenthetical "(°C, motorista e passageiro)" is slightly compressed and reads ambiguously against a single numeric parameter.

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 4-parameter control tool with matching annotations but no output schema, the description covers the core action and temperature but leaves the account/vehicle targeting ambiguity unresolved. It also omits the likely need to wake the vehicle first, which is a sibling tool's explicit job.

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% across 4 parameters, so the description carries the full burden. It explains 'ligar' (on/off) and gives a unit and scope for 'temperatura_c' (°C), but 'account' and 'veiculos' — including whether the vehicle array selects one or many cars — are never addressed.

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 and resource pair — turn the car's air conditioning on or off — plus the optional temperature-setting behavior. The resource is unique among the siblings (all other tesla_* tools deal with locks, horn, charging, location, or state), so an agent can select it without ambiguity.

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 closing example ("ligar a 21 °C antes de sair") gives a concrete usage scenario, which is better than nothing. However, there is no guidance on when NOT to use it, no mention of prerequisites such as waking the vehicle (tesla_acordar exists as a sibling), and no alternatives named.

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