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

No annotations are provided, and the description does not disclose any behavioral traits such as read-only nature, potential side effects, or rate limits. The tool is likely a simple read operation, but this is not stated.

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 short, which could be seen as concise, but it omits critical information about the parameters and return value. The brevity comes at the cost of clarity, making the description insufficient for effective use.

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 has no output schema and the description does not specify what the return format is (e.g., ISO 8601, Unix timestamp). The parameter definitions are mismatched, and there is no context about how the tool works, leaving an agent unable to use it correctly.

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 parameter descriptions (url, host, json, zone) do not align with a tool that returns a UTC timestamp. These descriptions appear copied from other tools and are misleading. The schema coverage is 100% but the content is irrelevant to the tool's stated purpose, so it adds no meaningful semantic value.

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 purpose. However, the parameters listed (url, host, json, zone) are unrelated to this purpose, creating confusion about what the tool actually does. The distinction from sibling tools like 'timezone' is only partially clear.

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?

The description provides no guidance on when to use this tool versus alternatives. There is no mention of scenarios, prerequisites, or contextual cues that would help an agent decide to invoke utc-time.

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