inspect_x402_challenge

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

With no annotations, the description carries the full burden. It discloses the action (unpaid request) and a key behavior (does not settle), but lacks details on side effects, authentication needs, or rate limits. Adequate but minimal.

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 sentences, zero wasted words. Front-loaded with the core action and immediately clarifies a common misconception about payment. Ideal conciseness.

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?

No output schema is provided, and the description only mentions 'return the structured x402 payment challenge' without detailing the structure or potential errors. For a tool returning a structured response, this is insufficient for full understanding.

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 single parameter 'endpoint' is fully described in the schema (100% coverage), so the description adds no extra meaning. Baseline of 3 applies, as no additional semantics beyond the schema are provided.

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: making an unpaid request to a paid endpoint and returning the x402 payment challenge. It distinguishes itself from sibling tools like analyze_territory_disruption or get_api_status by focusing on payment-specific inspection.

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 implies when to use (before settling a payment) and includes a critical exclusion ('Does not settle payment'). However, it does not explicitly mention alternatives or when not to use, which would be helpful given the presence of sibling tools.

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