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

Annotations already declare readOnlyHint, idempotentHint and openWorldHint=false, so the safety profile is covered. The description adds real context beyond them: addresses are auto-derived from wallet_list rather than passed in, and the return payload shape is given as [{ walletAddress, data }]. It does not cover the opaque "data" shape, chain coverage, or failure behavior for wallets that fail lookup.

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?

Two sentences, zero filler. The position types and the wallet source are front-loaded, and the return shape is appended compactly. Nothing could be cut without losing information.

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 parameterless, read-only aggregation tool with no output schema, the description covers what it fetches, where input comes from, and the envelope of the response. Missing only secondary detail such as supported chains, pagination/size limits, and behavior when a wallet has no DeFi activity.

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?

Zero parameters, so the baseline is 4. The description usefully explains why there are none – the address list is sourced internally from wallet_list – which prevents an agent from hunting for a wallet-address argument that does not exist.

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 description names a specific resource and its scope: DeFi positions (LP, staking, lending, vaults) across every user wallet. The enumeration clearly separates it from a token-holdings or transaction-history tool, but it never names the adjacent siblings (portfolio_tokens, portfolio_cex, portfolio_transactions), so the boundary with them is inferred rather than stated.

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?

"addresses taken from wallet_list" is a useful prerequisite and implies the natural call order, but there is no explicit when-to-use vs portfolio_tokens/portfolio_cex, and no exclusion for empty or unlisted wallets. Usage must be inferred from the scope statement.

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