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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds real value by naming the returned sections (payments/splits, 12-month outlook, payoff, lender comparison), but says nothing about the effect of as_of or error behavior. A 3 fits: useful content disclosure with gaps.

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 compact sentence with no padding, front-loading the resource ('One loan whole'). The poetic phrasing ('the lender's figure against ours') slightly reduces immediate clarity but costs little space.

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 must carry the return-value burden, and it partially does by listing the returned sections. It leaves open what as_of defaults to and how the lender comparison is expressed, and gives no routing guidance versus loan_loans.

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%, with loan_id and as_of already documented in the schema. The description adds no parameter-level meaning beyond that, so the baseline 3 applies.

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 enumerates the specific content of a single-loan detail view: payments with splits, a twelve-month forward view, payoff, and lender-vs-ours comparison. That distinguishes it from loan_loans (a list) without naming the sibling. The phrasing is idiosyncratic ('One loan whole') but the resource and scope are still clear.

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?

No explicit when-to-use statement, no mention of when to prefer loan_loans or loan_candidates, and no prerequisites. The agent must infer that this fetches detail for one already-known loan_id.

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