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

No annotations exist, so the description carries the full burden. It does disclose a real behavioral trait the schema cannot: a per-call cost of $0.005, plus the implicit read-only nature of 'inspect.' It does not state behavior on malformed/non-existent addresses, rate limits, or whether failure to detect a proxy is silently reported, which leaves gaps for an unannotated 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?

A single sentence, front-loaded with the verb and scope, then a tight enumerated list of returned fields, closing with the cost. Every clause carries information; the only mild cost is that the long field list reads as a run-on rather than being broken into a scannable structure.

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 one simple parameter, no output schema, and no annotations, the description does the heavy lifting by fully enumerating return contents, including the copycat-spoofing flag that an agent would otherwise not anticipate. It falls short only on error/edge-case behavior and confirmation that the operation is non-mutating.

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 0% and the description says nothing about the single 'address' parameter. The schema does enforce format via the regex ^0x[0-9a-fA-F]{40}$, so an agent can still construct a valid call, but the description adds no meaning (e.g., that the address must be an Optimism-chain address, not L1) beyond the structural constraint.

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 ('Inspect') plus the exact resource ('any Optimism address') and then enumerates the concrete outputs: account type (EOA/contract/EIP-7702), ETH balance, nonce, proxy standard, ERC-20 metadata, and a copycat flag. This is far more specific than the chain-prefixed siblings and lets an agent distinguish it from optimism_contract_risk or optimism_tx_explain without opening a schema.

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?

Usage is only implied: the enumerated output fields suggest 'use this when you need a broad profile of an address.' There is no explicit statement of when to prefer optimism_contract_risk, optimism_token_approvals, or optimism_tx_explain instead, and no prerequisites. The price note is helpful context but is not routing guidance.

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