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

Annotations already cover the safety profile (readOnlyHint, destructiveHint, openWorldHint), so the bar is lower. The description adds real value beyond them: it discloses the auth requirement (Cotlet API key with app access) and a non-obvious semantic caveat that trip dates are distinct from its steps' dates.

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 sentences, but the first and second overlap heavily, both enumerating summary, dates, privacy and Travel Buddies. The duplicated field list is redundant and slightly inflates the size without adding information.

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?

There is no output schema, so the description appropriately describes the returned trip's fields. It also covers the auth requirement and the trip-vs-step date nuance, leaving little an agent needs missing for a simple single-resource read.

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?

Only one parameter and schema coverage is 100%, so the schema already documents trip_id fully. The description adds no additional format or sourcing detail beyond what the schema provides, so baseline 3 applies.

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 (retrieve one trip) and enumerates the fields returned, so an agent knows this is the single-trip read rather than the list. It does not explicitly name list_trips or get_step as alternatives, but the 'One trip' framing largely distinguishes it from list_trips.

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 when-to-use context, no prerequisites stated in the description itself, and no routing to alternatives like list_trips. The only pointer to list_trips lives in the input schema ('Trip ID from list_trips'), not the description.

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