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

Annotations already declare readOnly, idempotent, non-destructive, open-world behavior, but the description adds genuinely useful context beyond them: the runtime 402 challenge is the payment authority, provider text is untrusted data, and the tool 'never signs or pays.' These are meaningful safety/trust disclosures, though return/pagination mechanics beyond x402Cursor are not fully detailed.

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?

Four dense but front-loaded sentences: the primary output is described first, followed by pagination, trust, and safety notes. Each sentence adds information, though the opening sentence is heavily packed with compound clauses.

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?

An output schema exists, so return value details need not be spelled out. For a browse tool the description covers the two result sets, pagination, trust model, and payment boundary adequately; the main gap is the absent per-parameter guidance for the nested query object and filters.

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 0% across 6 parameters, so the description must carry the semantic burden, yet it only explains x402Cursor. The query object with after/limit/definitionDigest, cursor, search, and x402Category are left entirely undocumented, and the 'one bounded page' phrasing only loosely hints at the limit constraints.

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 gives a specific verb ('Find') and precisely names two distinct result sets: bounded pages of qualified Voidpay descriptions and up to 20 live Marketplace x402 resources with seller detail URLs, call URLs and USDC prices. It clearly conveys a browse/search resource, though it never explicitly distinguishes itself from the sibling browse-like tools such as voidpay_storefront.

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 only usage guidance is 'Use x402Cursor to continue the marketplace page,' which covers pagination continuation but not when to choose this tool over voidpay_storefront, voidpay_status, or voidpay_checkout_link. There are no exclusions or selection conditions, leaving usage largely implied.

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