List x402 products

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

No annotations are provided, so the description carries the burden of behavioral disclosure. It explicitly says 'Free', 'Fetches', and 'live'/'never hardcoded', communicating a read-only, dynamic data retrieval operation with no cost. It does not mention authentication, rate limits, or failure behavior, but for a zero-parameter public list this is acceptable.

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 with zero wasted words. The 'Free' qualifier and the main action are front-loaded, and the parenthetical adds useful data-freshness detail without bloat. 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 tool with no annotations and no output schema, this description provides the core context: what is fetched, from where, that it is live, and that it is free. It mentions prices, ids, and schemas, giving the agent enough to interpret typical results. It could specify the exact response envelope, but the description is complete enough for the tool's simplicity.

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 is empty with 0 parameters, so the baseline of 4 applies. The description adds no parameter-level semantics, but none are needed because there are no inputs to document. There is no gap in parameter understanding.

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 uses a specific verb ('Fetches') and a specific resource ('live product catalog from the x402-tools seller API'), making the tool's purpose unmistakable. It also clarifies that prices, ids, and schemas are live rather than hardcoded. This clearly distinguishes it from unrelated siblings like package_trust_check and repo_merge_lookup.

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 the tool should be used when current product catalog data is needed, but it provides no explicit when-to-use or when-not-to-use guidance. It does not name any alternative tools or exclusion conditions. Since the siblings are clearly unrelated in purpose, the absence is minor, but usage is implied rather than stated.

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