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

Annotations already declare readOnly/openWorld/non-idempotent, so the description must add beyond that; it discloses the ranking methodology (real buyers in 30 days, uptime, speed, price), the cost model ($0.002 USDC per call via x402 or prepaid credits) and that it is in the free trial. No pagination or result-count behavior is stated, but what is given is genuinely useful context.

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 core purpose is front-loaded, but the paragraph is dense and mixes purpose, example, pricing, billing modes and trial status into long comma-heavy clauses. Some of it (price, trial) reads like marketing rather than selection guidance.

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?

With an output schema present, return-value explanation is not required, and the description covers what an agent needs to call correctly: job phrasing, ranking signals, scope, and a downstream re-check route. The only gap is differentiating from the x402-recommend sibling.

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 six parameters, including q, limit, network, maxPrice, minPayers and includeNovelty. The description only echoes two of them (q, maxPrice) via an example, adding no semantics beyond the schema — baseline 3 is appropriate.

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?

States a specific verb and resource: find the best working x402 services for a plain-English job, ranked by fit, buyers, uptime/speed and price. It also names the catalogue scope (whole x402 Bazaar) and routes to the x402-find-live sibling, though it does not explicitly distinguish itself from x402-recommend.

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?

Gives a concrete usage framing ('Describe a job in plain English') plus a worked example (q, maxPrice: 0.01), and points to /x402/find/live for fresh re-checks. It lacks explicit when-not-to-use guidance versus x402-recommend or x402-check, but the intended context is clear.

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