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

Annotations already establish read-only and open-world behavior. The description adds useful non-schema context: source series, update cadence implied by monthly data, history limit, x402 payment cost, and that failed calls are not charged.

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 definition is front-loaded with the core resource and source, then adds exclusions, history scope, and payment terms. Most content is useful, though the note about keeping the route name for the owner is somewhat extraneous to an agent.

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 an output schema and read-only/open-world annotations, the description supplies the remaining essential context: units, source, frequency, exclusions, history range, and payment behavior. Nothing critical for correct invocation appears missing.

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 only parameter is fully documented in the schema as months, 1 to 24, default 3. The description reinforces the 24-month history limit but does not add syntax or default details beyond the schema, so baseline 3 is appropriate.

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?

Names a specific resource and measured value: monthly uranium reference price in USD per pound U3O8, with the exact World Bank/FRED series. It also distinguishes this reference series from UxC and TradeTech spot or long-term quotes, which prevents mistaken source selection.

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?

Clearly indicates when this series is appropriate by excluding UxC/TradeTech quote types and stating that it provides the latest value plus up to 24 months of history. It does not explicitly name sibling tools as alternatives, but the source and quote-type exclusions give strong usage context.

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