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

With no annotations provided, the description carries the full burden and does meaningful work: it declares the endpoint is paid, names the exact price and payment chains, states no account or API key is needed, and specifies that failed calls are not charged. The main omission is any indication of response shape or pagination behavior beyond the field list. This is substantially more behavioral context than most paid-endpoint definitions supply.

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 the verb and resource, then packed with the pricing, auth, and failure-policy facts in a few short clauses. Every sentence carries information an agent needs before deciding to spend money. The trailing raw URL is arguably redundant given the tool already routes to it, but it is short.

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 read-only, three-optional-parameter endpoint with no output schema and no annotations, the description covers purpose, data fields returned, cost, payment rails, auth requirements, and failure billing. What is missing is modest: response envelope shape, ordering guarantees, and what an empty or error response looks like. Sufficient for an agent to call this correctly.

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 all three parameters (sort, limit, min_tvl_usd) are already documented with defaults and value ranges in the schema. The description adds only the implication that results span multiple chains, which hints there is no chain filter. Baseline 3 applies since the schema does the heavy lifting.

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 verb and resource: 'Live DeFi yields for veda: its pools across chains with APY, TVL, 7d APY change'. The agent immediately knows this returns yield-pool data for the Veda protocol, distinct from the buy_yields_chain_* and buy_yields_token_* siblings. It doesn't explicitly contrast itself with other protocols' tools, but the naming pattern plus 'for veda' makes the scope unambiguous.

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 by the price and payment terms ('$0.01 USDC on Base or Solana'), which lets an agent judge cost before calling. However, there is no explicit statement of when to prefer this over buy_yields_chain_* or buy_yields_token_* lookups, and no exclusions or prerequisites beyond the payment mechanics. Adequate but leaves the alternative-selection decision to inference.

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