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

No annotations are provided and the description does not mention side effects, ignored inputs, permissions, or the fact that all parameters appear to be discarded, so the agent cannot anticipate the tool's behavior beyond the returned timestamp.

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 short phrase with no filler, but it is so terse that it reads more like a title than a functional description; still, it earns its place.

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 gives the core output but omits output format, examples, and any explanation of the 9 optional parameters, leaving the overall context incomplete for an agent deciding how to call it.

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?

Although the schema covers all 9 parameters with descriptions, those descriptions are mostly unrelated to UTC time and several say the value is discarded; the tool description adds no clarification on why these parameters exist or how they affect the output.

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 states the tool returns the current UTC timestamp, which is a clear resource but lacks an explicit verb and does not differentiate from sibling tools like timezone or iana-zones.

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 provided for when to use this tool instead of siblings, nor when to pass parameters. The description merely states the output and leaves usage entirely to inference.

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