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

With readOnlyHint and openWorldHint already supplied, the description adds useful behavior: the default 30-day window, the 31-day cap, the catalogue source, and the fact that eclipse results depend on a place. It does not discuss output structure or ordering, but the safety profile is already covered by annotations.

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?

The description is front-loaded and contains no filler, with each clause naming a meaningful event family. It is one very long sentence, though, which makes it slightly less scannable than an ideally structured definition.

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?

The description covers event categories well and links location to eclipse appearance, which is important context. Because there is no output schema, it should do more to describe the shape or ordering of returned events, and it lacks sibling differentiation for a family of overlapping astronomy tools.

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%, so all seven parameters are already documented in the schema. The description echoes the default/max period and implies latitude/longitude matter for eclipses, but it adds little beyond the structured parameter descriptions.

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 identifies the resource as astronomical and mission events over a period, and enumerates the event families covered (Moon phases, eclipses, seasons, planetary events, mission events). It does not explicitly distinguish this from overlapping siblings such as perigee_tonight or perigee_sky_conjunctions, so it stops short of a 5.

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 implied by the period-based framing and the default/maximum range, which tells the agent this is for upcoming event calendars. However, there is no explicit when-to-use or when-not-to-use guidance and no named alternatives among the many sibling tools.

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