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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=false, so safety is covered without description help. The description adds genuinely new behavioral context beyond the annotations: the visibility scope ('the person can see') and the sort order ('newest first').

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?

A single front-loaded sentence listing scope, ordering, and returned fields with zero filler words. Nothing could be cut without losing 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?

With an output schema present, the description need not explain return values, yet it summarizes them harmlessly. For a zero-required-parameter list tool the definition is sufficient; only explicit routing against get_trip would make it fully complete.

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% with a single enum-typed status parameter, so the schema already documents it fully. The description restates the status values inline, which is mildly reinforcing but adds no syntax or semantics beyond the enum.

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 clear verb+resource (list every trip) plus a scope qualifier ('the person can see') and enumerates the returned fields, so the agent knows exactly what this produces. It does not explicitly distinguish itself from the similarly-named sibling get_trip, which is the only gap.

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?

Usage is implied by 'every trip the person can see' plus the optional status filter, so an agent can infer this is the collection-level read. However, it never names get_trip as the single-trip alternative or states when to prefer one over the other.

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