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

Annotations already declare readOnlyHint and destructiveHint, so the safety profile is covered. The description adds valuable context by stating 'nothing stored' (non-persistence), 'estimate' (not guaranteed), and the distinction between standard and negotiated rates, going beyond the annotations.

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 three sentences long, front-loaded with the primary purpose. Each sentence contributes meaningful info: the output type, the conditions (standard rates, no account, nothing stored), and the estimate caveat. There is no redundancy or filler.

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 12-parameter tool with no output schema, the description clearly communicates the core response (single total) and gives important context (standard rates, estimate nature). It does not explain conditional parameters or return format details, but the schema handles parameter guidance. Sufficient for tool selection and basic invocation, though not exhaustive.

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 descriptions provide 100% coverage for all 12 parameters, so the baseline is 3. The description does not discuss any parameter specifics; it only mentions that the total includes the Operations & Chauffeur Fee, which is not tied to a specific parameter. Thus, no additional semantic value is added over the 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?

The description states a specific verb ('Price') and resource ('one trip'), and clearly defines the output as a single fixed all-in total. It distinguishes itself from the sibling tool list_services by focusing on pricing rather than service definitions.

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?

Provides clear context by stating 'Standard rates, no account needed, nothing stored', indicating when this tool is appropriate. However, it does not explicitly mention alternatives like list_services or exclusions for negotiated-rate accounts, leaving the when-not guidance implicit.

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