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

Annotations already declare readOnly, idempotent, openWorld, non-destructive, so safety is covered and the description is free to add data-shape context. It does: which fields come back, that weather odds appear only 'when posted', that some statuses may be Go/Hold/Scrubbed, and that it emits a single speakable sentence. Minor gaps remain (whether the list is empty when no launches, how fresh the data is).

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?

Scope and time window are front-loaded, and each clause maps to a returned field rather than padding. The long parenthetical of viewing locations is borderline verbose but is genuine return-value information, so it still earns its place.

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 the burden of describing return values — and it does thoroughly, including status values, conditional fields, and the summary sentence. Combined with annotations covering the safety profile and a fully documented 2-param schema, nothing an agent needs to call it correctly 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% and the enum for 'when' is already documented, so the schema does the heavy lifting. The description only echoes the two-week default via 'in the next two weeks' and says nothing about 'limit' or how the time window interacts with it.

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 resource (rocket launches), a precise geographic and temporal scope (Kennedy Space Center / Cape Canaveral, next two weeks), and enumerates the return fields (rocket, mission, pad, day/time, status, weather odds, stream link, viewing spots). An agent can distinguish this from siblings like beach_flags or marine_forecast without opening any 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?

Explicit trigger: 'Use it when someone plans an Orlando or Space Coast trip or asks if there's a launch.' That gives clear positive guidance, but it names no alternatives or exclusions — e.g. it doesn't say to use marine_forecast for sea conditions or window_seat for aviation.

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