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

The description does not disclose that all input parameters are ignored or that the tool is stateless. The schema hints at this, but since no annotations exist, the description carries the full burden and fails to disclose these behaviors.

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 extremely concise and directly front-loads the core purpose. However, it is a fragment with no structuring, which slightly reduces the score.

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?

Given the 9 parameters and the lack of an output schema, the description fails to explain why parameters are accepted or what the return format is. It leaves major gaps and is incomplete for effective use.

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 schema provides descriptions for all 9 parameters, covering 100% of them. The tool description adds no further semantic value, so the baseline score of 3 applies.

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 provides the current UTC timestamp, though it lacks a verb. It is unambiguous but does not differentiate it from sibling tools like timezone.

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?

No guidance is given on when to use this tool instead of alternatives, and no conditions, exclusions, or use cases are mentioned.

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