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

With no annotations, the description carries the full burden, and it does disclose two things an agent cannot get elsewhere: the data source (Alchemy's transfer index) and that the call is paid — $0.01 USDC on Base via x402. It omits whether an unknown/non-existent address returns an empty profile or an error, and says nothing about index coverage limits or freshness.

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 core question is front-loaded and every clause names a concrete returned field; there is no filler. It is a long single run-on sentence built as a list, which is dense but readable and earns its length given there is no output schema.

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 substitute for return docs, and it does so by enumerating the profile contents across native, ERC-20 and NFT transfers plus USD-denominated large transfers. What is missing is edge-case behavior (invalid or unindexed address) and any indication of response size or pagination for the transfer lists.

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% and the single address parameter carries a pattern and description, so the schema does all the work. The description adds nothing about the address parameter beyond reiterating 'Arbitrum One address', which is the baseline-3 case.

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 opening question plus the enumerated fields ('wallet age, first funder, contract or EOA, ETH balance and nonce, latest transfers, top counterparties') states a specific verb-equivalent (profile) and resource (Arbitrum One address) unambiguously. It implicitly separates itself from arbitrum_wallet_balances by covering age, funder and counterparties, but never names that sibling, so an agent must infer the boundary.

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, even though several siblings (arbitrum_wallet_balances, arbitrum_transaction_summary, arbitrum_large_trades) overlap heavily on the data this tool returns. The agent can guess this is for investigative/due-diligence profiling, but nothing steers it away from cheaper, narrower siblings.

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