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

No annotations are provided, so the description carries the full burden. It discloses a cost ($0.003 USDC via x402) and the read-only nature via 'Read', which is valuable. It also notes the token limit. However, it does not mention error handling, rate limits, or the return format, which would improve transparency.

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 fluff. It front-loads the core function and appends the cost, which is relevant for agent decision-making. Every word adds value.

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 tool is simple with only two parameters and no output schema, so the description covers the primary purpose and cost. However, it omits the return value structure, error behavior, and the optional nature of 'tokens', which could lead to incorrect assumptions about the response format. Given no annotations, this is a moderate gap.

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?

With 0% schema description coverage, the description must compensate. It explains that 'address' is the wallet and 'tokens' are ERC-20 contract addresses, and that up to 10 can be supplied. However, it does not explicitly state that 'tokens' is optional or describe the address format beyond the schema pattern, leaving some ambiguity.

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 ('Read'), a specific resource (native ETH plus ERC-20 balances for one Base wallet), and a limit (up to 10 tokens). It distinguishes itself from siblings like base_wallet_balance (native only) and base_erc20_balance (single token) by emphasizing the multi-token snapshot capability.

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 implies usage for reading multiple balances at once, but does not explicitly mention alternatives or exclusions. There is no 'when to use this vs. base_wallet_balance' guidance, so the agent must infer the differentiation from the description alone.

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