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

Annotations already declare readOnlyHint=true, idempotentHint=true and destructiveHint=false, so the safety profile is fully covered and the description does not contradict it. What the description adds is scope: that a single call aggregates loans, Earn holdings and credits rather than one category. It says nothing about refresh/latency or whether the result is a point-in-time snapshot, which is the kind of detail that would justify a 4.

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 short sentence with no padding, which is structurally efficient. However, the trailing parenthetical is cryptic to the point of being unparsable, so the brevity comes partly from under-specification rather than disciplined concision.

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 tool with no output schema, the description does at least name the three portfolio components, giving a rough sense of the return shape. It stops short of explaining how those components are structured or what the credit values mean, which is the main remaining gap for a caller consuming the result.

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?

With one parameter at 100% schema coverage, the schema already documents the wallet field, so the baseline is 3. The description does add a small clarification: it frames the wallet as the subject of the query ("A wallet's loans"), whereas the schema text says "The wallet that will sign", which is ambiguous for a read-only call. That is marginal added value, not substantial semantics.

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?

It identifies the resource — a wallet's loans, Earn holdings and credits — so an agent knows this is a portfolio read rather than a loan- or vault-level call. But there is no verb, and the parenthetical "USDG, and each lend asset's apart" is garbled enough that the returned credit composition is unclear. Siblings like gage_loan and gage_earn_vaults are never referenced, so differentiation is left to inference.

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?

The description gives no when-to-use guidance and never contrasts itself with gage_loan (single loan) or gage_earn_vaults (Earn positions), which are the obvious alternatives for overlapping data. An agent must guess whether a portfolio call or the narrower sibling is appropriate.

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