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

The description gives no indication of side effects or behavioral expectations, and there are no annotations to fill that gap. While one might assume it's read-only, this is not explicitly stated, leaving ambiguity.

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, concise sentence with no unnecessary words or repetition. It effectively conveys the core purpose without clutter.

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 presence of sibling tools like utc-time and the confusing schema fields, the description is incomplete. It does not explain the extraneous parameters, how to invoke the tool, or how it differs from related tools, leaving the agent with insufficient 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?

The schema includes unrelated parameters (url, host, json) with descriptions that do not align with a timezone lookup, and the description does not clarify that only 'zone' is relevant. This creates confusion about which parameters are actually required or optional.

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 that the tool returns the current time in a named IANA timezone, which is specific and understandable. However, it does not explicitly distinguish itself from sibling tools like utc-time, though the resource (timezone) is apparent.

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 on when to use this tool versus alternatives such as utc-time. The description does not mention any conditions or contexts for its use, leaving the agent to infer applicability.

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