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

With no annotations provided, the description carries the behavioral burden and does well: it specifies the data returned, the 30-day history window, min/max/avg aggregates, and the paid x402/Base cost. It does not explicitly state read-only behavior or error conditions, but the retrieval nature and pricing are clearly disclosed.

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 two tight sentences. The core resource and returned fields are front-loaded, and the pricing/payment sentence is also operationally relevant.

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 one-parameter data-retrieval tool with no output schema, the description is complete enough: it explains what the tool returns, the historical range and aggregates, and the payment model. An agent has enough information to invoke it correctly given the id.

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 single parameter is fully documented in the schema as a DefiLlama pool UUID from /yields. The description adds no material meaning beyond the schema, so the baseline of 3 is appropriate.

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 and scope: one DeFi pool identified by DefiLlama id. It also enumerates the returned data (APY split, TVL, risk flags, 30-day APY/TVL history), making it distinguishable from list-oriented siblings such as defi_yields.

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 implied: use this when you have a DefiLlama pool id and need detailed data for that single pool. The id source is hinted via 'from /yields', but the description does not explicitly say when to use this versus defi_yields or defi_summary, nor does it state exclusions.

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