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

With no annotations, the description carries the full disclosure burden. It does add real value by revealing the return format ('exact wei as a decimal string') and a payment gate ('Costs $0.001 USDC on Base via x402'), which is non-obvious behavior an agent must plan for. It omits failure modes (invalid address, unsupported network) and rate limits, so the transparency is partial.

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?

Two compact sentences, front-loaded with the core purpose and method, then the return format and price. The audience enumeration is slight filler but costs almost nothing.

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, the description does supply the essential missing pieces: what is returned (wei decimal string) and the x402 cost. What remains uncovered is the default value for the optional network parameter and error behavior, which are modest gaps for a simple read tool.

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 0%, so the description must compensate. It conveys that the address is a public EVM wallet and that the network choice is Base or Ethereum, which covers the intent of both parameters. It does not state the address format constraint or which network is the default when omitted, so the compensation is incomplete.

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 specific verb+resource ('Live native ETH balance') and the underlying RPC method (eth_getBalance), scoping it to public EVM wallets on Base or Ethereum. This clearly separates it from ERC20 balance tools, though it never references the near-named sibling chain-live-balance, leaving the agent to guess how the two differ.

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 'for agents, portfolio monitors and blockchain automation' describes an audience, not a trigger condition. There is no when-to-use/when-not guidance and no routing advice versus chain-live-balance or chain-erc20-balance, so the agent must infer placement from the name alone.

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