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

With no annotations, the description carries the full burden but only states the basic transformation. It does not disclose how the number is provided given the input schema has zero parameters, nor what the output looks like or how edge cases (e.g., 11, 12, 13, decimals) are handled.

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 and front-loaded with its purpose, with no filler. It is concise, though it partly repeats the tool name and omits necessary behavioral detail.

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 no annotations and no output schema, an agent needs more than a one-line transformation statement. The empty input schema combined with the description's 'to a number' leaves unclear how to invoke the tool correctly, and the sibling overlap is unaddressed.

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 has zero parameters, so there is little for the description to add. The mention of 'a number' identifies the implied operand, which is the only semantic clue available to an agent.

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 names a specific operation ('add an ordinal suffix') and a resource ('a number'), so an agent can tell what it does. However, it does not distinguish this from the sibling x402-to-ordinal, which appears to serve the same purpose.

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 no guidance on when to choose this tool over alternatives such as x402-to-ordinal, nor any context for when ordinal formatting is appropriate. There are no explicit when/when-not conditions or named alternatives.

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