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

No annotations are provided, so the description carries the full burden. It does well by disclosing the paid nature ('0.01 USDC via x402'), the pair-selection behavior ('Highest-liquidity pair'), and that data is live. It doesn't cover failure modes or rate limits, but for a single-parameter quote tool this is substantial non-obvious information.

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 short clauses plus a fragment, with zero filler. The core output fields are front-loaded, followed by chain scope, pair selection, and per-call cost. Every word earns its place.

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, the description lists the expected return fields (spot price, liquidity, FDV, market cap, 24h volume) and explains the pair-selection logic, giving an agent a solid picture of what to expect. It does not describe error conditions or exact response nesting, but for a one-parameter, no-output-schema quote tool this is nearly complete.

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%: the 'address' parameter is fully documented with EVM and Solana format details. The description reiterates 'by contract address — EVM (Base/etc.) or Solana mint' but adds no new format or semantic details beyond the schema, so baseline 3 is appropriate.

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 specific verb and resource: 'Live DEX spot price ... for any token by contract address' and enumerates exact outputs (price, liquidity, FDV, market cap, 24h volume). It also states the supported chains (EVM Base, Solana), which clearly separates it from sibling tools like audit_bot_code (audits) and search_tokens (discovery). The title reinforces the same scope.

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 context is concrete: the tool is for tokens when you already have a contract address, on EVM (Base/etc.) or Solana, and need market data. It lacks an explicit 'don't use when...' or mention of search_tokens for address discovery, so exclusions are not spelled out, but the input requirement and chain scope give an agent enough to choose this tool appropriately.

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