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

With no annotations present, the description carries the full behavioral burden. It does well to disclose the hard cost ($0.005) and the exact data surface covered, which tells the agent this is a single read-only lookup. However it says nothing about behavior on an address with no code, unverified contracts, partial-failure cases, or whether results are cached/fresh, so important behavioral gaps remain for a zero-annotation tool.

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?

It is a single dense sentence that front-loads the action and chain, then lists capabilities in roughly priority order with the price tacked on at the end. Slight cost for being a run-on list rather than a structured sentence, but there is essentially no wasted wording.

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 must carry the return-shape burden, and it does so by naming every field group returned (type, balance, nonce, proxy standard, token metadata, copycat flag) plus the price. Missing only edge-case behavior and a note on how it relates to the deeper sibling tools.

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?

There is exactly one parameter, and schema coverage is 0% — the regex pattern in the schema conveys the 0x+40-hex format but has no description. The description contributes only that the address must be an Arbitrum address ("Inspect any Arbitrum address"), which adds real but minimal meaning, leaving it squarely at the minimum-viable level.

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?

Opens with a specific verb and resource ("Inspect any Arbitrum address") and then enumerates exactly what is resolved: EOA/contract/EIP-7702 status, ETH balance, nonce, proxy implementation standards, and ERC-20 metadata plus a copycat flag. The Arbitrum chain qualifier separates it from the many sibling *_address_inspect tools, though it never distinguishes itself from overlapping siblings like arbitrum_contract_risk or token_deep_scan.

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?

There is no explicit when-to-use or when-not-to-use guidance and no named alternative. Usage is only implied by the breadth of the enumeration, which signals this is the general-purpose first-pass address overview tool, but an agent must infer that from content rather than being told.

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