Find best x402 service

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

Annotations already declare readOnlyHint and openWorldHint, and the description does not contradict them. The description adds details on ranking methodology but does not explicitly mention that the tool makes no modifications or that results may change (open-world). Given the annotations cover the key behavioral aspects, a neutral score is appropriate.

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 description is unusually long and repetitive, with multiple sentences restating ranking weights and output fields. It lacks a clear front-loaded summary; the first sentence is confusing and the subsequent paragraphs ramble. A concise version would improve readability without losing essential 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?

Given the absence of an output schema, the description attempts to describe the response structure (ranking_version, need_blind_ranking, units map) and the meaning of include_facilitator_context. However, it leaves ambiguities (e.g., what 'units map' keys are, how caveats apply) and does not fully compensate for the lack of a formal output schema.

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?

The schema already provides complete descriptions for all 8 parameters. The description adds context on ranking criteria and mentions some parameters indirectly (e.g., 'price cap' for max_price_usd), but it does not meaningfully enhance parameter understanding beyond the schema. The addition of the 'units map' is unclear and could be considered more about output than input 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 clarifies that this tool returns ranked service recommendations based on a free-text need and optional filters, distinguishing it from a simple search. However, the phrase 'free ranking step' is ambiguous (likely 'first ranking step' or 'the ranking step'), and the long sentence structure initially obscures the core purpose.

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 description gives a broad trigger ('when you have a need in words') but does not explicitly compare with sibling tools (e.g., when to use x402_search_services vs. x402_find_best_service). No 'use X instead' guidance is provided, leaving the agent to infer the tool's relationship to others.

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