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

No annotations are provided, so the description carries the transparency burden. It usefully discloses the pay-per-call cost and the fact that three stablecoins are fetched in one call. However, it omits output format, zero-balance handling, and error behavior, which are relevant for a call that charges per request.

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 concise sentences with no filler. The core purpose and the cost caveat are front-loaded, making it easy for an agent to quickly parse the essential details.

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 read tool, the description is close to sufficient: it names the address input, the assets returned, and the cost. Yet with no output schema and no annotations, it leaves the expected response shape and edge-case behavior unspecified, so it is not fully complete.

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 coverage is 100%, and the only parameter, address, already has a clear description. The tool description adds asset context but does not meaningfully expand on the address format, validation, or chain details beyond what the schema already provides.

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 clearly states that the tool returns USDC/USDT/DAI balances for a base address and emphasizes that this is done in a single call. This gives it a specific resource and scope, though it does not explicitly name sibling alternatives like base_balance for differentiation.

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?

There is no guidance on when to prefer this tool over siblings such as base_balance, base_token, or polygon_stables. The cost and stablecoin scope imply a use case, but no exclusions, alternatives, or decision rules are provided.

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