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

No annotations exist, so the description carries the full burden and does well: it discloses the per-call price ($0.0029) and explains the return-value semantics (empty hex = EOA, non-empty = contract). It omits whether the call is read-only or requires any auth, though cost disclosure is a meaningful behavioral detail most definitions miss.

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?

Four compact sentences with the cost front-loaded and the return-value interpretation immediately after the action. Every sentence carries distinct information; nothing is redundant.

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?

There is no output schema, and the description compensates by explaining exactly how to interpret the returned hex string. Cost and return semantics are covered; only the read-only/permission posture is left implicit for a single-parameter read.

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 100% and the single 'address' parameter is fully documented as a 0x-prefixed EVM address. The description adds no format or constraint detail beyond 'at an address', so the baseline 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?

States a specific verb and resource: retrieve the deployed bytecode at an address, which also disambiguates the terse tool name 'chain_code'. It stops short of explicitly differentiating from the closest sibling onchain_address_check.

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 'Useful for distinguishing contracts from wallets' implies the usage scenario but gives no explicit when-to-use/when-not framing and never names an alternative such as onchain_address_check. Usage is inferable rather than directed.

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