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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It only adds that the result is in UTC and that twilight is included; it does not describe how coordinates are interpreted, what happens with an empty or malformed q value, or any other behavioral expectations.

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 a single compact phrase with no filler, and the key information is front-loaded. The leading 'Sun Times:' is somewhat redundant with the tool name, but the overall structure is appropriately concise.

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 tool is simple, having one optional parameter and an output schema, so the description does not need to explain return values in detail. However, the missing parameter format guidance and lack of usage guidance leave it only minimally complete for correct invocation.

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 0% and the description only vaguely indicates that a coordinate is involved. It does not explain the format of the q parameter, coordinate order, delimiter, or units, leaving the single parameter significantly underdocumented.

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: sunrise, sunset, and twilight times for a geographic coordinate, and it specifies the UTC timezone context. It does not explicitly distinguish itself from related sibling tools like weather or timezone_info, but the core function is unambiguous.

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?

There is no explicit guidance on when to use this tool over alternatives, nor any mention of alternatives or exclusions. An agent can infer a general use case, but the description provides no decision-making support 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.