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

No annotations are provided, so the description carries the burden. It usefully discloses the pricing unit ('1 credit = $0.01'), which is genuine domain context an agent cannot infer from a zero-parameter schema. However, it never states that the operation is read-only/safe or that it needs no authentication, and it gives no indication of result shape beyond 'credit prices'.

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?

Two short sentences with no filler. The core purpose is front-loaded, the unit conversion follows, and the purchase routing comes last where it belongs. Every sentence earns its place.

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 zero-parameter, non-mutating catalog tool with no output schema, the description covers what is returned (prices for every generation tool and launch-kit tier) and the unit of account. Since no output schema exists, a brief hint at return structure would have closed the remaining gap.

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 tool takes zero parameters, so there is nothing for the description to disambiguate; baseline 4 applies. The description correctly implies a parameterless, full-catalog listing rather than a filtered query.

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?

States a specific verb and resource ('List credit prices') plus the exact scope covered ('every generation tool and launch-kit tier'). This clearly separates it from sibling tools like get_balance and get_payment_info, which handle account state rather than a price catalog.

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?

Explicitly routes the agent elsewhere for a related need: 'To buy credits with USDC on Base, use get_payment_info and claim_payment.' That names the alternatives and the condition selecting them. It does not state when-not to use this tool (e.g., that it takes no arguments and needs no setup), but the usage context is clear.

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