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 the paid cost, payment currencies and chains, the absence of auth requirements, the no-charge-on-failure policy, and the upstream data source (DefiLlama). It does not mention rate limits, caching/freshness beyond 'Live', or response shape, 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?

Front-loaded with 'Paid' and the data summary, then the commercial terms, in a compact telegraphic style with no filler. The trailing raw URL is somewhat redundant since the endpoint is already implied by the tool binding, but it is the only mild excess.

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?

For a zero-required-parameter read tool, the description covers cost, access, data source, and the returned metric set, which compensates for the absent output schema. The remaining gap, exact response structure and pagination behavior for limit, is minor.

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%, and the schema already documents sort, limit, and min_tvl_usd with defaults, so the baseline of 3 applies. The description adds no extra meaning about how these filters interact with the per-protocol pool listing.

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 resource ('Live DeFi yields for stake-dao-yield'), scopes it ('its pools across chains'), and enumerates the returned metrics (APY, TVL, 7d APY change). This cleanly separates it from the chain-level and token-level yield siblings in the tool list.

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 strong access conditions (paid, $0.005 USDC on Base or Solana, no account/API key, failed calls not charged), which helps an agent decide whether it can even call it. However, there is no explicit statement of when to prefer this over the chain/token yield endpoints or the general search/top yield tools, so selection guidance is only implied by the protocol name.

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