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

No annotations are provided, so the description must disclose all behavioral aspects. It only says 'current UTC timestamp' and gives no indication of what the 9 parameters do, why they are accepted, or that they are effectively ignored for the primary function. This is a significant transparency gap.

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 (one sentence), but it under-specifies by ignoring the parameter list. It is not a matter of being concise; it is a matter of being incomplete. The sentence earns its place but fails to address the schema's complexity.

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?

With 9 parameters, no annotations, and no output schema, the description is wholly inadequate. An agent has no way to determine whether any parameter is required, how to interpret the response, or why the parameters are listed. This is a basic timestamp tool with an inexplicably complex schema, and the description provides none of the necessary context.

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 descriptions cover all parameters, they are completely disconnected from the tool's purpose. For example, 'Git ref name; discarded after the shape check' implies a git-related operation, not UTC time. The description adds no explanation of how these parameters affect the timestamp output, leaving the agent confused about why they exist.

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 a clear purpose: returning the current UTC timestamp. It is a specific verb-resource combination and distinct from siblings like timezone. However, it lacks detail on format or precision, and does not mention the odd parameters.

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 on when to use this tool versus alternatives. There is no mention of when it is appropriate or when not, and no comparison with sibling tools like timezone or calc-eval.

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