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

With no annotations, the description carries the burden and does disclose useful behavior: it is a read-only 'check', it only covers a curated set of 8 tokens and common spenders, it flags unlimited approvals, and it states a $0.005 cost. It stops short of saying what happens for tokens/spenders outside that set.

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 front-loaded sentence with the scope and cost stated up front; the parenthetical token/spender lists add useful specificity without bloat, though the trailing ellipses make the coverage feel loosely bounded.

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 one-parameter read-only lookup with no output schema, the description covers what is inspected, the fixed coverage set, the flagging behavior, and the price. The main remaining gap is return shape and how non-covered tokens are reported.

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 0% and the single parameter is only constrained by a regex pattern with no description. The description implies 'address' is the wallet whose approvals are inspected, which adds some meaning, but it never confirms the format or that it must be an Optimism address.

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 (Check), resource (ERC-20 approvals / allowances), and chain (Optimism), then enumerates the exact token and spender coverage. This clearly separates it from siblings like optimism_address_inspect and optimism_contract_risk.

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 implied by the enumerated scope (8 major tokens against common spenders) and the 'flags unlimited approvals' note, but there is no explicit when-to-use or when-not-to-use guidance, nor a pointer to alternatives such as optimism_address_inspect or token_deep_scan.

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