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

With no annotations, the description must carry the behavioral disclosure burden. It only states the output and omits that all inputs are discarded, that the tool is side-effect free, and that it works without arguments. The schema's per-parameter 'discarded' notes give partial info, but the description itself is not transparent.

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 sentence with no filler, making it concise and front-loaded. It is efficient, though it uses its brevity to avoid addressing the param mismatch, which is more of a completeness concern than a conciseness one.

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?

A time-returning tool with seven unrelated optional parameters demands explanation, but the description leaves an agent uncertain whether arguments are required or meaningful. With no annotations or output schema present, the definition is not complete enough for reliable 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?

The input schema provides descriptions for all seven parameters, giving 100% coverage, so the baseline is 3. The description adds no parameter-level meaning and does not synthesize that they are effectively no-ops, but the schema already covers each individual field.

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 the tool returns the current UTC timestamp, which is specific about the output. However, it does not explain the purpose of the seven input parameters or differentiate it from sibling tools like timezone and iana-zones, leaving some ambiguity.

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 guidance about when to use this tool versus alternatives. It does not mention that all parameters are ignored, nor does it provide any context for when this should be selected over e.g. timezone.

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