nasa_daily_brief

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

With no annotations, the description carries the behavioral transparency burden. It discloses the partial-results behavior when an upstream service is down, which is useful. It doesn't cover other aspects like error handling, but the disclosed trait adds significant value.

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?

Two sentences: the first lists what the brief includes, the second notes partial-result behavior. Every word earns its place with no redundancy.

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?

Despite having no output schema, the description gives a solid sense of what is returned (list of content areas) and the failure behavior. It doesn't fully describe the return structure, but for an aggregation-style tool this is adequate.

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 50%, with one parameter (earth_event_limit) lacking any description. The tool description doesn't elaborate on either parameter's effect, so it fails to compensate for the missing schema documentation.

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 clearly states it gets a 'compact NASA daily brief' and enumerates the specific content (astronomy image, space-weather notices, Earth events, DSCOVR image). This distinguishes it from sibling tools that each target a single NASA data source.

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?

The use case is implied: use this for a consolidated daily summary. However, it doesn't explicitly contrast with alternatives like nasa_apod or nasa_space_weather, or state when not to use it.

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