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

Annotations already establish this as a read-only, idempotent, non-destructive operation. The description adds valuable return-content context, including balances, next payment, payoff date, interest, and lender reconciliation status, though it does not describe collection scope or ordering.

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 description is a single dense sentence that lists the relevant per-loan fields with little wasted text. It is front-loaded with 'Each loan' but remains a fragment rather than an action-oriented statement, so it is not maximally clear.

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, the description usefully enumerates the returned fields that an agent would need to judge relevance. For a low-complexity read-only list tool, this is largely complete, though it omits whether all loans are returned, ordering, and default as_of behavior.

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 100% and the single as_of parameter is documented as an ISO date, so the schema carries the parameter semantics. The description's phrase 'as of when' hints at the as-of concept but does not add format, default, or behavior details beyond the schema.

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 identifies the resource as loans and enumerates the per-loan fields returned, making the tool's content clear. However, it lacks an explicit verb such as 'list' or 'return' and does not distinguish itself from siblings like loan_get or loan_interest.

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 plural phrasing 'Each loan' implies an overview/list use case, but the description gives no explicit when-to-use guidance or alternatives. An agent must infer from the name and siblings that loan_get is for a single loan.

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