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

There are no annotations, and the description does not disclose that all input parameters appear to be ignored or discarded. Several parameter descriptions imply unrelated behaviors (e.g., URL normalization, JSON validation) that contradict the simple timestamp operation, creating confusion about actual side effects or lack thereof.

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, direct sentence with no unnecessary wording. It is front-loaded and easy to parse.

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 absence of an output schema and the presence of many seemingly irrelevant parameters, the description lacks essential context. It does not specify the timestamp format (e.g., ISO 8601, Unix epoch), whether arguments are ever accepted, or why the listed parameters exist. This incompleteness could lead to incorrect usage.

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 schema descriptions cover 100% of parameters, they are misleading in context. Parameters like 'url', 'city', 'feed', and 'json' suggest operations unrelated to a UTC timestamp, and terms like 'discarded after the shape check' are ambiguous. The schema does not help an agent understand which, if any, parameters are actually meaningful for this tool.

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 specific operation: returning the current UTC timestamp. It is clear and matches the tool name. However, it does not distinguish itself from sibling tools like 'timezone' or 'iana-zones' beyond the explicit UTC focus.

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 versus alternatives. The presence of nine seemingly unrelated optional parameters with no explanation of how they relate to fetching a timestamp leaves the agent without clear invocation criteria.

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