pay_l402_challenge

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

No annotations are provided, so the description carries the full burden. It mentions the outcome ('receive the authorization token') and a behavioral note about omitting macaroon for MPP mode, but it lacks critical details: it doesn't specify whether this is a read-only or destructive operation, what happens on failure, rate limits, or authentication requirements. For a payment tool with no annotations, this is insufficient.

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 concise with two sentences that are directly relevant. The first sentence states the purpose and outcome, and the second provides a usage note. There's no fluff, but it could be slightly more structured by front-loading key distinctions from siblings.

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 no annotations and no output schema, the description is incomplete. It covers the basic purpose and a usage hint but misses behavioral traits (e.g., side effects, error handling) and output details. For a payment tool with 3 parameters and no structured safety hints, this leaves significant gaps for an AI agent to understand full context.

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%, so the schema already documents all parameters well. The description adds minimal value: it reiterates that macaroon should be omitted for MPP mode (which is also in the schema) and implies the tool handles both L402 and MPP flows. No additional syntax, format, or contextual details beyond the schema are provided, meeting the baseline for high coverage.

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 tool's purpose: 'Manually pay an L402 or MPP invoice and receive the authorization token.' It specifies the verb ('pay'), resource ('invoice'), and outcome ('receive the authorization token'). However, it doesn't explicitly distinguish this from sibling tools like 'pay_invoice' or 'verify_l402_payment', which reduces clarity about when to choose this specific 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 provides some usage context: 'Use this if you need to handle the L402/MPP flow yourself.' This implies it's for manual handling of these protocols, but it doesn't explicitly state when to use this versus alternatives like 'pay_invoice' or 'access_l402_resource'. No exclusions or prerequisites are mentioned, leaving gaps in guidance.

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