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

Goes well beyond the annotations (readOnlyHint=false, openWorldHint=true, idempotentHint=false, destructiveHint=false) by disclosing that the build is asynchronous (returns a build id immediately, 3-6 minutes), that AlgoTrips emails the result or failure, that unknown field names cause a refusal with a corrective message, and that booking/payment happen on algotrips.com rather than in the tool.

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-loaded with the core action, and nearly every sentence carries distinct information (async timing, email, validation, prerequisites). Some sentences are dense run-ons, e.g. the long choicesConfirmed enumeration, which slightly hurts readability without being redundant.

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 17 parameters, an output schema, and full schema coverage, the description covers the hard parts: mutation, async completion, validation failure modes, and auth requirement. The one notable gap is not telling the agent that the returned build id is meant to be used with trip_status to check progress.

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 adds cross-parameter meaning the schema cannot express: hotelStars and interests 'shape' which hotels and activities are picked, and flights are omitted entirely when gettingAround is none. It adds real semantics on top of an already complete 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 opening sentence names a specific verb and resource: 'Builds a full day-by-day trip with live prices' for given cities, dates, travellers and home city. It is clearly the builder among siblings like my_trips and destination_facts, but it never names those siblings, so an agent must infer that trip_status is the follow-up to the returned build id.

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 concrete preconditions and gating rules: must be signed in, startDate is required, and with choicesConfirmed not true plus any of budget/hotel/pace/activities/gettingAround/city-order missing, nothing is built and questions are returned. It does not explicitly say when to prefer this over siblings or how to poll progress, which keeps it short of a 5.

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