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

Annotations already cover the safety profile (readOnly, idempotent, non-destructive, closed-world), so the description's main addition is the quota behavior: 300 free calls/day shared with the HTTP free routes, liftable via a pass. That is genuinely useful operational context, but nothing is said about caching, result freshness, or how often the live status is re-verified. (Note: openWorldHint=false sits oddly against a tool that queries live endpoints across networks, but the description does not contradict it.)

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?

Two dense sentences with no filler, and the discovery semantics are front-loaded. The opening quota/pricing sentence is arguably the less important half of the definition for tool selection, but it is short and useful.

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?

Six of seven parameters are documented in-schema, an output schema exists so return values need no explaining, and quotas are covered. What is missing is the decision context an agent needs in a large sibling set: whether to call this before settled_check, what 'live' status means, and how the pass relates to the sibling tools that also consume quota.

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 both the meaning and the examples for q, pass, sort, limit, status and network already come from the schema. The description merely restates the keyword/network/max-price/sort dimensions without adding format details, defaults, or precedence rules beyond what the schema provides.

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: ranked discovery of live x402 endpoints, with the ranking dimensions (keyword, network, max price, sort) and per-result signals (payability, delivery verification). It is clearly distinct from siblings like settled_check or settled_preflight, though it never names or contrasts an alternative explicitly.

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 when-to-use or when-not-to-use guidance, no prerequisites, and no routing to sibling tools despite a 17-tool family containing plausible alternatives (settled_check, settled_preflight, settled_status). The free-cap sentence hints at cost but does not tell an agent when this discovery tool is the right choice.

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