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

With no annotations provided, the description carries the full behavioral burden. It does not state input behavior (e.g., how the date string is parsed, whether it accepts ISO format), output format (e.g., returns 1-4), or any edge cases (e.g., leap years, invalid dates). This is a significant gap for a tool with zero annotation coverage.

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 but not in a useful way – it is under-specified rather than concise. 'Quarter Of Year: Quarter Of Year' is redundant and front-loads no actionable information.

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 complexity of date handling, zero annotation coverage, no output schema, and a crowded set of date-related siblings, the description is far too sparse. It does not explain return values, formatting expectations, or edge-case behavior, leaving the agent with insufficient context to call the tool correctly.

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?

Schema description coverage is 100%, with the single parameter 'date' documented as 'Date to process'. This meets the baseline of 3; the description adds no additional parameter semantics beyond what the schema already provides.

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 'Quarter Of Year: Quarter Of Year' merely restates the tool name and title, functioning as a tautology. While the tool name itself conveys the general concept of extracting a quarter from a date, the description adds no clarifying verb, resource scope, or differentiation from siblings like x402-fiscal-quarter or x402-quarter-start.

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. Siblings such as x402-fiscal-quarter and x402-quarter-start suggest possible overlap, but the description does not address this, nor does it state any prerequisites or conditions.

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