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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, so the safety profile is covered. The description adds genuine behavioral context beyond that: the meaning of each status value and the default scope when no filters are supplied.

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?

Four short sentences, each doing work: scope, routing guidance, enum semantics, default behavior. The most actionable guidance (start here, resolve a name to an id) 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?

There is no output schema, so the description carries some burden for return values; it hints at the key one (trip ids for later use) but does not describe the returned fields. For a simple, zero-required-parameter list tool with full annotation coverage, this is nearly 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 coverage is 100%, so the baseline is 3, but the description goes further by defining what each enum value actually means ('planning' is actively worked on, 'ready' is planned but not taken, etc.), which the schema's terse 'lifecycle status' line does not convey. includeExample is left to the schema, which is acceptable.

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 (List) and resource (trips) with an ownership scope: trips the user 'owns or collaborates on'. This clearly distinguishes it from get_trip and the many mutating siblings (create_trip, update_trip, add_destination).

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?

Explicitly tells the agent when to reach for this tool: 'Start here whenever the user refers to a trip by name ("my Japan trip") so you can resolve it to a trip id.' It also states the no-filter default ('Call with no filters to see everything'), giving both a trigger and a fallback behavior.

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