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

Goes well past the annotations by disclosing the caching layer, that a cache miss costs a metered vehicle_data read, and that the call does not wake the car — a critical side-effect fact given wake_vehicle exists as a sibling. Annotations already cover safety, so this is pure added value.

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?

Three short sentences, each carrying distinct information (return shape, cost model, side effects), with the valuable content front-loaded. Nothing is wasted.

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?

Behaviorally rich for a one-parameter read tool with no output schema, and the return shape is described adequately. The gap is the entirely undocumented vin parameter and the unspecified default when no vin is supplied.

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 the description never mentions the vin parameter, so it adds no meaning about what vin selects or what happens when it is omitted (required count is 0). Low coverage means the description should have compensated and does not.

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 concrete verb and resource set: returns latitude/longitude plus a resolved place name. It implicitly separates itself from get_vehicle_state by scope (location only), though it never names a sibling explicitly.

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 metered-read and cache notes give an agent cost-based guidance about when calling is cheap versus expensive, but there is no explicit when-to-use rule or named alternative (e.g. get_vehicle_state) for comparison.

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