request_faucet

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

No annotations are provided, so the description must fully disclose behavioral traits. It does so by stating the rate limit and the exact return amount (0.25 USDC). This is sufficient for a simple faucet request. However, it does not mention what happens if the rate limit is exceeded (likely an error response) or what the return value looks like, but for a tool with only one optional parameter and no output schema, this level of transparency is reasonable.

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 consists of three concise sentences, each providing essential information: purpose, rate limit, and output/value. There is no redundancy, and the most critical information (what the tool does) is front-loaded. Every sentence earns its place, making the description highly efficient.

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 the tool's simplicity (one optional parameter, no output schema, and a straightforward action), the description is largely complete. It covers the purpose, network, rate limit, exact return amount, and practical context. However, it could be slightly improved by mentioning potential error conditions (e.g., invalid address or rate limit exceeded) or the requirement that the agent must have an allowance file for the default address. These minor omissions prevent a perfect score.

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 input schema has 100% coverage for its single parameter ('address'), with a clear description of its format and default behavior. The tool description does not add further parameter-specific information beyond what the schema already provides. Since the schema fully explains the parameter, the description's additional context (rate limit, output amount) is not required for parameter semantics, so a baseline score of 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?

The description clearly states the action ('Request'), the resource ('free testnet USDC'), and the specific context ('Run402 faucet (Base Sepolia)'). It also provides the exact amount (0.25 USDC) and its practical significance (enough for 2 prototype databases). No sibling tool performs a similar faucet function, so the description effectively distinguishes this tool.

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 indicates the tool's purpose and its rate limit (1 per IP per 24h), which helps the agent decide if it's appropriate to use. However, it does not explicitly state when not to use it or suggest alternative tools for different scenarios (e.g., needing more tokens or different testnet). Given no sibling faucet tools exist, the guidance is adequate but could be more explicit about exclusion conditions.

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