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

With no annotations, the description carries the full burden and does disclose real behavioral traits: result cap of 10, ranking signals (text match, 7-day liveness probes, on-chain USDC payer counts), and the billing quirk that no charge occurs on an empty match. What it does not say is whether returned endpoints are paid or whether calling them costs money, which is a notable omission for a tool whose outputs are paid services.

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?

Three sentences, front-loaded with the action and resource, followed by return shape and then the cost caveat. No filler and every sentence adds information.

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 exists, so the description does the work of describing the return set (up to 10 ranked endpoints) and the signals behind the ranking, plus the billing exception. It stops short of describing the fields on each endpoint record, which an agent would want before deciding to trust the results.

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 all four parameters are already documented, including the 1-10 limit range and max_price_usd meaning. The description only restates the 10-result ceiling and adds no syntax or formatting guidance for need, network, or price beyond the schema.

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 (ranks) and resource (live x402 endpoints) plus the ranking inputs, so an agent knows exactly what it gets back. It does not distinguish itself from the sibling find_apify_actors, which is a similarly shaped discovery tool, so a 4 rather than a 5.

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 examples ('web search', 'token price', 'pdf to text') imply the kind of plain-language need to supply, which is useful context. There is no statement of when to prefer this over find_apify_actors or x402_endpoint_card, and no prerequisites, so usage is only implied.

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