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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It reveals nothing about return format, validation of invalid months, error behavior, or whether this is a read-only lookup. 'Birthstone: Birthstone' is entirely uninformative.

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 this is under-specification rather than effective conciseness. It contains zero useful information and is merely a repetition of the tool name, failing to earn its place as a meaningful definition.

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 one parameter, no annotations, and no output schema, the description must explain what the tool does, how to format the month, and what the result looks like. The current placeholder leaves an agent completely in the dark and unable to invoke 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% since the 'month' parameter has a description ('Month to process'). However, the tool description adds no value beyond the schema; the schema itself remains vague about acceptable month formats. Baseline 3 applies due to high coverage, but the description does not enhance understanding.

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 is 'Birthstone: Birthstone'—a pure tautology that merely repeats the tool name. It does not state an action or resource, e.g., 'Given a month, return the associated birthstone'. An agent cannot tell what this tool does based on the description.

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, what input format is expected (e.g., full month name, number, abbreviation), or how it compares to sibling tools like x402-zodiac-sign or x402-moon-phase. The description provides no context whatsoever.

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