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

No annotations are provided, so the description carries the full behavioral burden. It does not disclose input parsing behavior, rounding or precision rules, output format, error handling, or side-effect-free nature, leaving meaningful behavioral gaps for a tool that accepts a string parameter.

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 front-loaded sentence with no wasted words. It states the operation immediately and is appropriately sized for a simple unit-conversion tool.

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 one-parameter conversion tool with no output schema, the description is nearly complete. It states the conversion direction, but could have mentioned the return value (the result in hectares) or precision behavior to be fully self-contained.

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%, which establishes a baseline of 3 per the scoring rules. The description adds no parameter-specific meaning beyond the schema, and the schema's parameter description ('Value to process') is itself generic, but the high coverage means the schema is expected to carry parameter semantics.

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 specific verb and resource: convert acres to hectares. It is clear on its own, but does not differentiate from the reverse sibling x402-hectares-to-acres or the general x402-units-convert, so it falls short of a 5.

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?

Usage is implied by the conversion statement: an agent should use it when acres need to become hectares. However, the description gives no explicit when-to-use guidance, no exclusions, and no routing to the reverse or general conversion siblings.

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