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

With no annotations provided, the description carries the full burden. It does disclose a meaningful behavioral trait: pay-per-call cost ($0.01 USDC) and the 'one call' aggregation. However, it does not mention read-only nature, possible failure modes, or what the response contains.

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 short sentences with no wasted words. The core capability is front-loaded, and the cost/usage detail is included compactly.

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, low-complexity balance lookup, the description plus schema is largely complete. It communicates what the tool returns conceptually, the target address, and a key operational detail (cost). Lack of an output schema is not a major gap here.

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 only parameter is already documented as 'polygon address (0x...)'. The description adds no extra parameter semantics beyond what the schema provides, which is acceptable given the high schema coverage.

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 specifies the resource (USDC/USDT/DAI balances on Polygon), the target (a polygon address), and the convenience of doing it in one call. It distinguishes itself from sibling tools like polygon_balance (native vs stablecoin balances) and base_stables (different chain).

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?

No explicit guidance is given about when to choose this tool over alternatives such as polygon_balance, polygon_token, or base_stables. The description implies it is for stablecoin balances, but it does not state exclusions or conditions.

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