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

With no annotations at all, the description carries the full disclosure burden and does well: it names the price ($0.005 USDC on Base or Solana), states no account or API key is needed, and states that failed calls are not charged. The only gaps are that it doesn't describe rate limits, caching/freshness, or pagination behaviour beyond the default row cap.

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 front-loaded ('Paid. Live DeFi yields for uniswap-v2') with the key facts and no filler; every clause carries pricing, coverage, or a usability constraint. The telegraphic style is dense but readable, though a slightly clearer separation of cost terms from data terms would help.

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 3 optional parameters, no annotations, and no output schema, the description supplies what an agent needs: what data comes back, its source, the cost, the chains accepted for payment, and the endpoint. It falls just short of full completeness because return shape (fields per row, ordering, error behaviour) is only summarized rather than scoped.

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 all three parameters already carry their own defaults and ranges; baseline 3 applies. The description adds useful framing by naming APY, TVL, and 7d APY change, which hints at what 'sort' selects between, but it adds no format or syntax detail beyond the schema.

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 ('Live DeFi yields for uniswap-v2') plus the exact fields returned (APY, TVL, 7d APY change) and the data source. It also implicitly separates itself from the sibling buy_yields_protocol_uniswap-v3 and buy_yields_protocol_uniswap-v4 variants by pinning the protocol.

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 makes clear this is the uniswap-v2 slices of a larger yields family (with sibling chain- and token-level tools), so the agent can infer when to pick it. However, it never explicitly says when to prefer it over buy_yields_chain_* or buy_yields_protocol_uniswap-v3, nor does it state any exclusions or prerequisites for a paid call.

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