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

No annotations are provided, so the description carries the full behavioral burden. It discloses the computation (highest vs lowest pair price -> spread %) but says nothing about which DEXes/chains are scanned, whether an address or token contract is required, rate limits, auth, or how stale the quotes are.

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?

A single economical sentence with the core purpose front-loaded. It wastes a little space by re-prefixing the description with the tool name, which is already known.

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 no output schema, no annotations, and two undocumented parameters, the description should do more. It never clarifies the input contract or the shape/comparability of the spread result, so an agent cannot confidently invoke it despite the readable purpose statement.

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 0% for two parameters, and the description never explains either. 'token' is faintly implied by the tool name, but 'address' is entirely opaque (token contract? wallet? chain?) and no format, chain, or pairing semantics are given.

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 names a concrete verb and resource: a cross-DEX/chain price-spread scanner that computes highest vs lowest pair price into a spread percentage as an arbitrage signal. It is clear, but it does not distinguish itself from close siblings such as x402-dex-arb, x402-dex-scanner, or x402-perp-funding-arb.

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 statement of when to use this versus the numerous neighboring DEX/arbitrage tools, nor any precondition or exclusion. Usage is only implied by the phrase 'arbitrage signal', leaving the agent to guess among x402-dex-arb and x402-dex-scanner.

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