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

Annotations already declare read-only, non-destructive, open-world behavior. The description adds useful scope details (100-result cap, worldwide coverage), but it does not mention freshness, ordering by launch window, timezone handling, or data source.

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 compact sentence with zero wasted text. The result limit, geographic scope, and returned field names are all 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?

For a zero-parameter sensor with no output schema, the description gives sufficient high-level context: what is returned, how many, and which fields. Minor gaps around ordering, time range, and freshness keep it from a 5.

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?

The tool has zero parameters, so there are no parameter semantics to explain; a baseline of 4 is appropriate. The listed fields describe the response rather than parameters.

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 description states a specific resource and scope: the next 100 launches worldwide, with the returned fields rocket, mission, pad, and window. It is clear what the tool retrieves, but it does not explicitly distinguish itself from the sibling cell_sensor_launches_at tool.

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 only implied: the phrase 'next 100 launches' suggests upcoming-launch lookup. There is no explicit when-to-use guidance, no exclusions, and no pointer to the likely alternative cell_sensor_launches_at.

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