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

No annotations are provided, so the description must disclose behavior itself. It reveals that the operation is a read via direct RPC and runs in parallel, but it doesn't mention the response shape, whether the native token balance is returned, what 'and more' includes, or how failures are handled. This is a significant gap for an unannotated tool.

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?

One sentence, front-loaded with the core purpose and implementation detail. The only waste is repeating the tool name as a prefix ('x402-multi-balance:'), which is redundant but not costly.

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?

With no output schema and no annotations, an agent needs more context to invoke correctly: chain input format, units of the balance, supported chain list, and whether wallet/address are alternatives. These are missing, so the definition is not complete enough for reliable invocation.

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?

The schema descriptions are placeholders ('Chains to process', 'Wallet to process', 'Address to process'), so they don't add format or meaning. The description names example chains but doesn't specify accepted chain identifiers, and leaves the relationship between 'wallet' and 'address' ambiguous since both are optional and seemingly redundant. Baseline for 100% schema coverage is 3, but the unhelpful descriptions and unresolved ambiguity justify a lower score.

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 clear verb and object: 'Check an Ethereum wallet balance across multiple chains in parallel via direct RPC.' It is specific about scope and names example chains, distinguishing it from generic balance tools. It doesn't explicitly differentiate from the sibling x402-wallet-balance, but the multi-chain focus is evident.

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 phrase 'across multiple chains in parallel' implies the intended use case: querying balances for a single wallet on several networks at once. However, it gives no explicit when-not-to-use guidance or reference to alternatives such as x402-wallet-balance for single-chain checks, leaving routing to inference.

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