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

With no annotations supplied, the description carries the full burden and does well: it discloses that the call is paid ($0.002 USDC on Base or Solana), requires no account or API key, that failed calls are not charged, and that the data source is DefiLlama. It does not cover rate limits, response format, or latency, 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 'Paid.' lead is front-loaded and the pricing, auth and failure terms follow in terse fragments with no filler. The raw URL at the end is useful for a paid HTTP endpoint but is the one element that could be considered redundant with the tool name.

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 and no annotations, so the description must convey what comes back, and it does by naming APY, TVL and 7d APY change. Payment, auth, failure semantics and the endpoint are all covered; only pagination/response-shape detail is missing, which the limit parameter largely mitigates.

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%, with sort, limit and min_tvl_usd all documented in the schema itself. The description adds no parameter-level detail beyond loosely echoing the fields the sort options correspond to (APY, TVL), so the baseline of 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 the exact resource ('Live DeFi yields for stackingdao: its pools across chains') and the fields returned (APY, TVL, 7d APY change). It implicitly distinguishes itself from the chain-scoped siblings by saying 'its pools across chains', so an agent can tell this is protocol-wide rather than chain-filtered.

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?

Usage is only implied: it is clear this fetches yields for the stackingdao protocol, but there is no explicit guidance on when to prefer it over buy_yields_top, buy_yields_chain_* or another buy_yields_protocol_* entry. No when-not conditions or prerequisites beyond the payment terms are stated.

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