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

No annotations are provided, so the description must carry the full burden. It does disclose what is returned (ETH balance, USDC balance, tx count, contract status), which is useful. However, it does not explicitly state that the operation is read-only or non-destructive, nor does it mention error handling or rate limits. 'Snapshot' implies no side effects, but this is not made explicit.

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 a single, concise sentence that front-loads the tool's purpose and lists the key outputs. Every word earns its place, with no redundancy or unnecessary detail.

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?

Given the tool's low complexity (one parameter, no output schema, no nested objects), the description adequately covers the return values and purpose. It does not mention the response format or units, but for a snapshot tool this is a minor gap. The description is complete enough for an agent to understand what to expect.

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 parameter is described as '0x address on Base'), so the schema carries the parameter meaning. The description adds context that the address is used to fetch a multi-faceted snapshot, but does not add new syntax or format details beyond the schema.

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 uses a specific verb ('snapshot') and resource ('Base address') and enumerates the exact data returned (ETH balance, USDC balance, tx count, contract status). This clearly distinguishes it from siblings like gas_now or token_balance, which focus on single metrics.

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 'One-call snapshot' implies a convenience use case for getting multiple pieces of data at once, but does not explicitly state when to use this tool versus alternatives or list exclusions. There is no comparison to sibling tools, leaving usage context only implied.

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