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

With no annotations present, the description carries the full burden of behavioral disclosure. It mentions only that the tool returns a current UTC timestamp, but fails to disclose that the many input parameters appear to be accepted and then ignored, or to specify the timestamp format or side effects.

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 front-loaded, but it is underspecified for a tool with eight seemingly unrelated input parameters. It is not bloated, yet it is too terse to be fully useful on its own.

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?

Despite having a large input schema and no output schema, the description only gives the basic purpose. It does not clarify whether the inputs affect the output, what the return value looks like, or why parameters like 'feed', 'path', and 'json' exist for a UTC timestamp tool.

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 has 100% description coverage for all 8 parameters, with each parameter already described as discarded or side-effect-free. The description adds no parameter-related meaning, so it meets the baseline but does not improve on the schema.

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, identifying both the resource and the time zone. However, it does not explicitly use a verb and does nothing to distinguish itself from the sibling tool '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 usage guidance is provided. The description does not explain when to prefer this tool over 'timezone' or any other sibling, nor does it state any prerequisites or exclusions.

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