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

Annotations already establish readOnly/idempotent/closed-world, so safety is covered; the description adds real value beyond them with a data snapshot date ('as of October 19, 2026'), the ranking order, and the paged nature of the result. It stops short of noting whether the ranking is stable across pages or how large the underlying table is.

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?

Front-loaded with the resource and identity, then the returned fields, then paging — no wasted sentences. It is a single dense run-on sentence, which slightly hurts scannability but every clause carries 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?

With no output schema, the description correctly takes on the burden of describing return contents: per-lender metrics, aggregate portfolio total, and per-state loan counts. The main residual gap is guidance on page-walking behavior and result-set size, which matters for a paged national table.

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%, with both limit and offset fully documented including ranges and defaults, so the baseline is 3. The description only adds the word 'Paged', which does not extend meaning beyond what the schema already provides.

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?

States a specific resource ('National Section 538 lender table from USDA's public file'), enumerates the fields returned (loan count, total loan amount, latest fiscal year), the sort order (ranked by loan count), and the extra aggregates (total portfolio, per-state loan counts). This is clearly distinguishable from siblings like list_538_loans or get_538_income_limits, which cover different resources.

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?

Usage is only implied: an agent can infer this is the tool for national lender rankings, and 'Paged' hints at how to walk results. There is no explicit statement of when to prefer this over list_538_loans or find_usda_rural_rentals, and no exclusions or prerequisites.

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