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

With no annotations provided, the description carries the full behavioral disclosure burden. It discloses the exact signature scheme (EIP-191 personal_sign, EIP-1271 for smart-contract wallets), the signed payload format, and the additional Ed25519 proof requirement for address changes. It does not state response/error behavior or explicitly say the operation mutates state, but the binding behavior is well conveyed.

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 dense but efficient: the first sentence establishes purpose and wallet role, the second details signature and change-proof requirements. Every sentence earns its place, though the heavy technical parentheticals make it slightly dense and could benefit from clearer separation between the base requirement and the conditional change requirement.

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 covers the essential context: why the address matters, what must be signed, and when proof is required. There is no output schema, so return behavior is not described, and the source of agent_id is not stated, but an agent has enough information to construct the required parameters correctly.

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 only 33%, so the description must compensate. It explains address as the controller-owned Base EVM address, signature as EIP-191 personal_sign over the exact string, and proof as a hex Ed25519 signature only needed when changing an existing address. This adds substantial meaning beyond the bare schema for all three parameters.

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 states the operation: it binds the agent's one EVM address on Base, used for receiving USDC as a seller and paying as a buyer. This is specific about the verb, resource, and role, and makes the tool's purpose unmistakable even among many siblings.

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 gives strong contextual guidance: this wallet is the payment address for selling and buying, so the agent knows when this binding matters. It also explains the conditional case of changing an existing address by requiring proof. It does not explicitly name alternatives or exclusions, but no direct alternative tool exists here.

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