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

With no annotations, the description carries the full burden and does well: it discloses that the call is paid, the exact price and payment chains, that no key or account is required, that failed calls are free, and that the data source is DefiLlama. It leaves rate limits and response envelope shape unstated, which keeps it short of a 5.

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 lead word 'Paid' front-loads the most decision-relevant fact, followed by scope, then cost, then access terms, all in two dense sentences with no filler. The raw endpoint URL at the end is the only element that reads as appended rather than integrated.

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?

There is no output schema, so the description must convey return content, and it does by listing APY, TVL, and 7d APY change for pools across chains. Combined with clear payment and credential terms, an agent has enough to decide and call; only pagination and the exact response format are absent.

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 the sort, limit, and min_tvl_usd parameters are already documented in the schema, setting a baseline of 3. The description mentions that pools carry TVL, which hints at the default min_tvl_usd filtering, but adds no syntax, units, or default-value 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?

The description names a specific verb and resource (live DeFi yields for the dfdv-staked-sol protocol, its pools across chains) and enumerates the returned metrics: APY, TVL, and 7d APY change. This distinguishes it cleanly from the many sibling tools like buy_yields_chain_solana and buy_yields_token_sol, which are scoped to chains or tokens rather than a 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?

It states the access conditions (paid, $0.01 USDC on Base or Solana, no account or API key) and that failed calls are not charged, which tells an agent it can risk calling. However, it never says when to prefer this over sibling protocol, chain, or top-yield tools, nor what happens if the protocol has no pools on a chain; the routing decision is left implicit.

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