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

With no annotations and no output schema, the description carries the full load, but it only says 'check a wallet balance'. It never states that this is a read-only operation, how 'across chains' works, what the return format is, or which input combination is required.

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 a single focused sentence with no filler. It is appropriately short for a simple balance-check tool, though the ambiguity of 'across chains' prevents a higher score.

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?

The description is too thin for an agent to confidently invoke this tool among the many wallet-related siblings. It lacks required-parameter information, clarification of wallet vs address, sibling differentiation, and any note about output or multi-chain behavior.

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%, but each parameter description ('Chain to process', 'Wallet to process', 'Address to process') is generic and does not explain their roles or relationships. The description adds no extra meaning beyond the schema, so it sits at the baseline.

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 states a clear verb and resource: 'Check a wallet balance across chains.' This conveys the core action and scope. However, it does not explicitly differentiate itself from closely related siblings like x402-wallet, x402-multi-balance, or x402-wallet-tokens.

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?

The description provides no guidance on when to use this tool versus alternatives. It does not mention exclusions, prerequisites, or whether the wallet and address parameters serve different use cases.

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