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

Annotations already declare readOnlyHint=false, destructiveHint=false, and openWorldHint=false, so the safety profile is covered. The description adds only the 'no deletes' scope note, which is marginally useful but largely redundant with destructiveHint=false. It says nothing about side effects on the garage, required permissions, or what a successful creation returns.

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 with the core action front-loaded and no filler. The second sentence is somewhat tangential for a create tool but is compact and not wasteful.

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?

Though an output schema exists (so return values need not be described), the definition is inadequate for a 19-parameter, 11-required creation tool with 5% parameter documentation. There is no enumeration of required inputs, no guidance on the enum-typed fields, and no usage context, leaving significant gaps.

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 5% across 19 parameters (11 required), and the description contributes zero parameter information. For a tool requiring make, model, year, purpose, owner, displacement, engine type, aspiration, cylinders, fuel, and fuelRating, the definition leaves the agent entirely dependent on a nearly undocumented schema.

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: 'Adds a vehicle to the connected user's TuneWorks garage.' An agent knows this creates a vehicle. However, it does not distinguish itself from siblings like create_vehicle_make, create_vehicle_modification, or update_vehicle, which all operate on related garage entities.

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?

No guidance on when to use this versus update_vehicle, archive_vehicle, or the other create_* siblings. The lone note 'Deletes are not supported' is a lifecycle caveat, not usage direction. An agent gets no signal about prerequisites or the appropriate context.

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