The queryable index of the agent economy (PAID $0.02)

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

Annotations already declare readOnlyHint=false, openWorldHint=true, idempotentHint=false, and destructiveHint=false. The description adds important beyond-annotation context: the $0.02 cost, x402 payment, network, and POST route. However, it does not explain what the non-readonly status means or any side effects.

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?

It is short and front-loaded, but the first line merely repeats the title and the second line is the only substantive content. There is no bloat, but the structure is under-informative rather than optimally tight.

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 an open-world paid index with six optional filters and many sibling tools, the description is not complete enough to tell an agent what data is indexed, what the index is for, or how to choose it over alternatives. Output schema and annotations cover some gaps, but the core purpose remains vague.

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% and the description provides no parameter details, so the calibration baseline of 3 applies. The schema itself documents limit, query, network, price, uptime, and conformance filters with useful exclusion semantics.

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 is essentially a restatement of the title/name; 'queryable index of the agent economy' identifies a vague resource but no concrete verb or result domain. It does not distinguish this index from siblings like catalogue or v1_index_x402, nor does it say what can actually be queried.

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?

There is no indication of when to use this tool, when not to use it, or which sibling to choose instead. The only operational detail is the paid route and price, which is not usage guidance.

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