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

Annotations declare a non-read-only, non-idempotent write action, and the description adds a genuine behavioral side effect not present in annotations: it wakes the car if needed. It still omits permission/authentication needs and whether it can fail when the car is offline.

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, action front-loaded with the waking side effect following. Nothing is padded, though the brevity comes partly at the cost of parameter guidance.

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 mutating no-output tool this covers the core action and one side effect, but with zero parameter documentation and no permission/error context, an agent cannot determine how the account/vehicle selection works.

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% and neither of the two parameters (account, veiculos) appears anywhere in the description. With no required parameters and no explanation of how the target car is selected, the description leaves the parameter layer entirely undocumented.

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 (start navigation) and a specific target resource (the nearest Supercharger), which is more concrete than a generic destination setter. It does not explicitly name the sibling tesla_definir_destino, so differentiation must be inferred from 'Supercharger mais próximo'.

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?

Usage is only implied: the phrasing 'até o Supercharger mais próximo' suggests when this is appropriate versus a general destination tool, but there is no explicit when-to-use, when-not-to-use, or named alternative such as tesla_definir_destino.

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