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

The description does not disclose side effects, return format, or whether the tool is read-only. No annotations are provided to fill this gap, so an agent cannot infer the behavior beyond 'get current time'.

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 and therefore concise, but it is not well structured: it ignores the large parameter list entirely, omitting any mapping between the tool's purpose and its inputs. The brevity sacrifices necessary clarity.

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 description is far from complete given the tool's complexity. It does not clarify which of the nine parameters is actually relevant, what the output looks like, or how the tool behaves in edge cases (e.g., invalid timezone names).

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 description does not explain any parameters. Although the schema includes a 'zone' parameter with a sensible description, the other eight parameters (e.g., 'ref', 'url', 'city', 'feed', 'host', 'json', 'path', 'query') have descriptions that are irrelevant to timezone lookup, leaving an agent without clear guidance on which parameter to provide.

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 time in a named IANA timezone, which is a clear purpose. However, the accompanying schema lists nine unrelated parameters (e.g., 'ref', 'url', 'feed', 'host', 'json', 'path', 'query') with descriptions that do not align with the stated function, undermining an agent's ability to understand what the tool actually does.

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 such as 'utc-time' or 'iana-zones'. It does not mention any conditions, limitations, or typical use cases.

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