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

Annotations already declare readOnlyHint=true and openWorldHint=false, so the safety profile is covered structurally. The description adds nothing beyond that: no note on what data is returned, whether transfers are included or a separate call, or any rate/auth context.

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?

It is short and wastes no words, but the single fragment is under-specified rather than efficient — there is no verb-led statement of purpose to front-load. Brevity here comes at the cost of clarity.

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 is the only place to explain what comes back, and it does not — it is unclear whether it returns account numbers, a transfer list, or both. For a read tool in a crowded banking namespace, that leaves selection ambiguous.

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?

The tool takes zero parameters, so there is no parameter semantics burden on the description. Baseline 4 applies for an empty 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 is a noun fragment ("US bank account numbers and transfers") that largely restates the title "Get bank account" rather than stating an action. It hints at the returned resource but gives no verb and does not distinguish this from siblings like get_wallet or list_recipients.

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?

There is no guidance on when to call this versus the nine siblings, no prerequisites, and no exclusions. An agent must guess whether it needs get_banking or get_wallet to retrieve banking details.

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