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

Annotations already declare destructiveHint=true, readOnlyHint=false, and idempotentHint=false, so the safety profile is established. The description adds beyond that by disclosing the confirmation gate and the read-only-mode block, which are genuinely operational facts. However, it says nothing about what the destructive effect actually is, whether the vehicle must be awake or in park, or whether a start window applies.

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, front-loaded with the action and then the constraints, with no filler. The only minor cost is that the terse phrasing of the confirmation rule leaves the agent to infer what "confirmations are on" means in practice.

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 destructive, non-idempotent vehicle command with no output schema and 0% parameter coverage, the definition covers safety gating but not effect or outcome. An agent still lacks enough to know what success looks like or what preconditions the vehicle itself must satisfy.

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 0%, so the description carries the full burden for two parameters. It explains the conditional role of confirm=true, which is real added meaning the bare boolean does not convey, but vin is never mentioned and neither parameter's format or source is clarified.

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?

"Remote-starts the vehicle" gives a specific verb+resource and is clearly distinct from sibling actions like actuate_trunk, honk_horn, or set_climate. It stops short of naming an adjacent tool an agent might confuse it with, but the action itself is unambiguous.

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?

It states two real preconditions: confirm=true when confirmations are enabled, and that it is blocked in read-only mode. That is useful gating context, but there is no guidance on when an agent should choose remote start versus other actuation tools, or under what vehicle conditions it is appropriate.

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