update_driver_details

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

With no annotations, the description carries the full burden. It does reveal a key behavior: partial updates (only provided fields change). However, it does not disclose return behavior, validation, permissions, or side effects. This is a meaningful disclosure but leaves significant behavioral context unstated.

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?

The description is a single sentence, front-loaded with the action, and contains no filler or redundant schema repetition. Every word earns its place.

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?

The description is adequate for a simple update tool: purpose and partial update behavior are clear, and the schema covers all parameters. However, without annotations or an output schema, the return format and post-update behavior remain undisclosed, and with 9 parameters, slightly more contextual detail would improve completeness.

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 100%, so baseline is 3. The description adds value by clarifying that only desired change fields need to be provided, which enhances understanding of the optional parameters without repeating each schema description.

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?

The description 'Update a driver's personal or vehicle details' clearly identifies the action and resource, and the scope ('personal or vehicle details') distinguishes it from sibling tools like update_driver_availability and update_driver_location. It is specific and not a tautology, though it doesn't explicitly name alternatives.

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 instruction 'Only provide fields you want to change' provides clear usage guidance for partial updates, implying this tool is for modifying existing driver details and that only changed fields need be supplied. It gives context but does not explicitly list when-not-to-use or alternatives, so it stops short of a 5.

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