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

No annotations are provided, so the description must carry the full burden of behavioral disclosure. It only states a yes/no check about the current year and does not disclose that the input parameters appear to be ignored or only used for shape checks, nor does it mention whether the operation is read-only or has side effects.

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, terse sentence with zero wasted words. It is front-loaded with the primary purpose and is appropriately concise for a simple boolean check.

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?

For a tool with 9 optional parameters, no output schema, and no annotations, the description is woefully incomplete. It does not explain the role of the parameters, what the return value looks like, or any caveats. An agent cannot confidently invoke this tool based solely on the description.

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 descriptions cover 100% of the parameters and are quite detailed (e.g., 'discarded after the shape check'), so the baseline is 3. The description adds no additional meaning beyond the schema, and it does not help reconcile why these parameters exist for a tool that ostensibly checks the current year.

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 clear verb ('has') and resource ('current UTC year' with 52 ISO weeks), making the core purpose understandable. However, the 9 input parameters are unexplained and appear unrelated to the stated check, creating ambiguity about what the tool actually does with them.

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?

There is no guidance on when to use this tool versus any sibling. The description does not mention prerequisites, conditions, or alternatives. An agent is left without any context to decide when this tool is appropriate.

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