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

With no annotations provided, the description carries the full burden of behavioral disclosure. It only states the conversion purpose, omitting details about output format, error handling, or whether the operation is read-only. This is a significant gap for a tool with no 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 a single, well-formed sentence that states the purpose without unnecessary words. It is front-loaded and directly usable, earning a perfect score for conciseness.

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 simple one-parameter conversion tool, the description covers the core purpose and calendar types. However, it does not specify the format of the returned solar date or any limitations, which would be helpful given the lack of an output schema. It is adequate but leaves minor gaps.

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 input schema already fully describes the date parameter with format and an example. The description adds value by clarifying the calendar systems involved (Vietnamese vs. Gregorian), which is not present in the schema description, thereby enriching parameter meaning.

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 clearly states the tool's function: converting a lunar date in the Vietnamese calendar to a solar (Gregorian) date. This directly distinguishes it from the reverse sibling tool convert_date_solar2lunar.

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 gives unambiguous context for when to use this tool—when a lunar date in the Vietnamese calendar needs conversion to a Gregorian date. It does not explicitly name alternatives or exclusions, but the direction is clear and the sibling tool names imply the reverse operation.

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