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

Annotations already establish read-only/safe, so the bar is lower, and the description still adds real value: account scoping, newest-first ordering, the auth requirement (Cotlet API key with access to this app). It does not cover pagination behavior or the limit default, but for a read-only list this is solid added context.

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?

Front-loads the resource and scope, and every sentence carries information. "newest first" is stated twice ("Your trips, newest first..." and "...on your own account, newest first"), which is a small redundancy but the rest is tight.

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 read-only, two-parameter list tool with full schema coverage and annotations covering the safety profile, the description supplies everything else an agent needs: scope, ordering, returned fields, filtering, cross-tool id usage, and the auth prerequisite. Nothing material is missing.

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%: limit and status are both documented with ranges, defaults and enum values in the schema. The description restates status filtering and adds no format or semantics beyond it, so the 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?

Names a specific verb+resource (list trips) and immediately constrains scope: "Returns the trips on your own account," which separates it from get_trip and the step-level siblings. It also enumerates the surfaced fields (dates, privacy level, distance, step count), so an agent knows what this list yields without opening the schema.

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?

Gives a concrete filtering condition ("Filter by status to see only planned, ongoing or past trips") and a downstream linkage rule ("Use trip_id from each item in the other endpoints"). It stops short of naming a sibling alternative for the single-trip case, so it is strong context without explicit when-not-to-use routing.

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