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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint, so the safety profile is covered. The description adds behavioral value beyond that by stating the operation is 'Free and unlimited' and by disclosing what each listed trip includes, such as totals per currency.

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 two sentences with no filler: the first states the action and output contents, and the second lists filters plus a cost/limit note. Every clause contributes useful information and is front-loaded.

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 filtered read-only list tool with rich annotations and no required parameters, the description is complete: it specifies returned fields, all filter dimensions, and the free/unlimited behavior. There is no missing information an agent would need to call and interpret the tool successfully.

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 100%, so the schema already documents all parameters. The description restates the filterable fields in natural language and links 'from' and 'to' as a start date range, but it adds no new format or semantic detail beyond 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 starts with a clear verb and resource, 'List saved trips,' and then specifies the exact fields returned and available filters. This makes the tool easily distinguishable from siblings like trip_delete, trip_record, and trip_export.

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 description implies use for retrieving and filtering trips, but it does not explicitly state when to choose this tool over alternatives such as trip_export. There is clear context for what it does, but no when-not-to-use guidance or alternative tool routing.

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