Fetch and parse a publisher's x402 manifest

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

The description explains the fetch action and return of structured manifest, but with no annotations to lean on, it omits details about error handling (e.g., missing manifest), network dependencies, or idempotency. It is adequate but not fully transparent.

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 two sentences, both front-loaded with essential information. No fluff or redundancy—every word adds value.

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 a single parameter and no output schema, the description adequately covers the tool's purpose and output ('structured manifest'). Minor gaps exist (e.g., no mention of error conditions or manifest format), but overall it is complete for a simple fetch operation.

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 coverage is 100% with clear description for domain. The description does not add extra meaning beyond the schema, hitting the baseline 3. No additional context 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 title and description clearly state the tool fetches and parses a publisher's x402 manifest, specifying the well-known URL path. It distinguishes from sibling tools like verify_x402_settlement by clarifying its role in discovery of accepted schemes, networks, and prices.

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 usage context ('Used to discover what a publisher accepts'), providing clear guidance for when to call this tool before payment. However, it does not explicitly contrast with verification siblings or state when not to use it.

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