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

There are no annotations, and the description does not mention side effects, return format, read-only behavior, or error conditions. The agent is left without any information about what happens when the tool is invoked.

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 very short and free of unnecessary detail, making it concise. However, it is a noun phrase rather than a complete sentence and lacks structural elements like a verb or an explanation of output, so it is not optimally 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?

Given the tool's likely simple purpose, the description is too minimal. There is no output schema, no mention of return values, and no clarification of the odd input parameter set, leaving important context missing.

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 100% description coverage, many parameter descriptions are irrelevant to the stated tool purpose and appear copied from other tools (e.g., url, city, json, query). The descriptions do not clarify how these parameters relate to returning IANA timezone names, and terms like 'discarded after the check' add confusion.

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' conveys that the tool provides IANA timezone names, but it lacks an explicit verb and does not clearly specify whether it returns a list, validates input, or performs another operation. It gives a rough sense of purpose but remains vague.

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 about when to use this tool versus related sibling tools such as timezone, tz-asia-barnaul, or utc-time. The phrase 'for clock calls' hints at a context but does not explain selection criteria or exclusions.

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