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

Annotations already establish read-only and non-destructive behavior. The description adds value beyond that by disclosing the return characteristics: real branches/stores with address, hours, and phone, no-branch options, source information, the date checked, and firsthand accounts. This gives an agent useful context about provenance and trustworthiness.

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 compact and front-loads the newcomer/no-SSN context before enumerating the return contents. The opening metaphor is slightly ornamental, but the rest of the sentence earns its place by specifying scope and output details.

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 single-parameter, read-only tool with an output schema and complete schema documentation, this description covers audience, scope, the qualifying condition (no SSN/credit history), and the return format including provenance and date. Nothing needed for correct invocation is missing.

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%: the sole parameter, topic, has an enum and clear descriptions for each value. The tool description reinforces the domain but does not materially extend the schema's parameter semantics, so the baseline score of 3 is appropriate.

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 states a concrete resource—bank accounts, credit cards, phone plans, and SSN routes—and the specific scope: routes that work without an SSN or US credit history. It also clearly says what the tool returns, making it easy to distinguish from the sibling listing/search and move tools.

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 phrase 'specifically the routes that work without an SSN or US credit history' clearly signals when this tool is appropriate, reinforced by the title 'for someone with no SSN yet.' It does not describe when-not-to-use scenarios or name an explicit alternative, but no sibling tool appears to compete for the same use case.

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