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

Annotations already declare readOnly/idempotent/non-destructive, so safety is covered; the description adds real context beyond them by disclosing the upstream data source (SEC EDGAR Reg AB II ABS-EE filings) and that coverage is only the trusts 'we track'. It stops short of describing return shape or pagination behavior.

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 tight sentences, no filler; the resource scope is front-loaded and the routing purpose follows immediately.

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 simple read-only list tool with no output schema and three fully documented parameters, the description supplies everything needed to select and call it: scope, filters, data origin, and the downstream dependency it serves.

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%, so the baseline is 3, but the description adds meaning the schema does not: 'sponsor' is characterized as a captive-finance company / depositor with sample values, and the asset-class filter is tied to the domain. This slightly exceeds what the schema alone conveys.

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 verb ('List') and a precisely scoped resource: US auto loan/auto lease securitization trusts sourced from SEC EDGAR Reg AB II ABS-EE filings. It explicitly names the sibling it feeds into (abs_trust_performance), so an agent can distinguish it from other abs_* tools without opening a schema.

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?

Gives two concrete use cases — resolving the exact trust name that abs_trust_performance requires, and auditing sponsor/asset-class coverage. It names the alternative tool explicitly, but offers no exclusions (e.g., when to go to abs_sector_delinquency instead).

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