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

Annotations already declare readOnlyHint and idempotentHint, so the safety profile is covered. The description adds meaningful behavioral context beyond that: the x402 endpoint enables anyone to pay in USDC, receiving is free and unlimited, and bank withdrawal is the only part requiring verification.

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 core resource information is front-loaded in the first sentence, and the following two sentences provide relevant operational context about setup, fees, and verification. It is slightly longer than strictly necessary, but every sentence earns its place.

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?

For a tool with a single well-documented parameter, rich annotations, and no output schema, the description is complete: it states what the tool returns, that no setup is required, and when the account is ready. An agent has everything needed to call it 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 description coverage is 100%: the only parameter, onboarding_token, is already described as 'The token returned by create_account.' The description adds no additional parameter semantics, so the baseline of 3 applies.

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 identifies the resource being returned: Base and Solana wallet addresses plus x402 endpoints on each chain. The annotation title 'Get wallet addresses and x402 endpoints' supplies the explicit verb, and the resource is distinct from sibling tools like check_status or get_funding_details.

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 clear context about when the tool is usable: 'Works from the moment the account exists: no verification, no fee, nothing to set up.' It does not explicitly name alternatives or exclusions, but it gives enough precondition context that an agent can decide when to call it.

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