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

No annotations are present, so the description alone must convey behavior. It does not disclose side effects, return format, or whether any parameters are actually used. The description is too sparse to provide meaningful transparency.

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 brief, but brevity comes at the cost of clarity. It lacks a clear verb, scoping information, or any structural breakdown that would help an agent understand the tool. It is concise but not effectively structured.

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 no output schema, no usage context, and a description that does not explain the nine optional parameters, the tool is far from complete. An agent cannot determine what this tool does, what it returns, or how to call it effectively.

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 has descriptions for all nine parameters, they are largely unrelated to the stated purpose of IANA timezone names. Parameters like 'ref', 'url', 'city', 'feed', 'host', 'json', 'path', and 'query' appear to be decoys or irrelevant, and the description does not explain how any parameter maps to the tool's function. Only 'zone' is topically related, but its role is still unclear.

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 'Common IANA timezone names for clock calls' is a vague noun phrase rather than an explicit statement of functionality. It does not clearly say whether the tool lists, validates, or returns timezone names, and it fails to distinguish itself from sibling tools like 'timezone' or 'utc-time'.

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 'timezone' or 'utc-time'. There is no mention of intended scenarios, prerequisites, or exclusions.

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