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

With no annotations, the description carries the full burden and does so well: it discloses that the call is paid ($0.005 USDC on Base or Solana), requires no account or API key, and that failed calls are not charged. It also identifies the data source (DefiLlama) and promises 'live' data. It does not cover rate limits, latency, or what an empty/unknown-protocol response looks like.

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.' then the resource, then pricing and access terms, then the endpoint URL — an efficient order for an agent deciding whether to call. Nearly every clause carries information; only the URL is arguably redundant if the server already routes to it.

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 paid data tool with no output schema and no annotations, the description supplies the essential missing context: cost, payment rails, no-auth, no-charge-on-failure, and data provenance. It stops short of describing response shape or error/empty-result behavior, which matters somewhat since there is no output schema.

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 sort, limit and min_tvl_usd are already fully documented in the schema with their defaults. The description adds only indirect context by naming the metrics (APY, TVL, 7d change) that the sort options presumably map to; it adds no syntax or interaction detail beyond the schema. Baseline 3 applies.

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 resource (DeFi yield pools for the drift-staked-sol protocol) and specific returned metrics: APY, TVL and 7d APY change from DefiLlama. The phrase 'its pools across chains' implicitly separates it from the chain-scoped siblings (buy_yields_chain_*), but it never names or explicitly contrasts with any alternative, leaving the differentiation to inference.

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?

'Pools across chains' hints that this is the cross-chain aggregate view rather than a per-chain or per-token view, which is the natural contrast with buy_yields_chain_* and buy_yields_token_* siblings. However, there is no explicit when-to-use or when-not-to-use statement, and no guidance on choosing this over the chain/token yield tools.

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