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

The readOnlyHint already covers safety, and the description adds substantial behavioral context: the balance is bank-reported as of the latest balance date, not ledger balance, and private/feed semantics are explained. It does not discuss ordering, pagination, or response shape beyond field meanings.

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 dense but front-loaded: it first states the resource and returned fields, then explains private accounts and feed statuses. Every sentence adds useful meaning, though the long parenthetical clauses make it slightly heavy.

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?

There is no output schema or input schema, so the description carries the full burden and does so: it names the returned fields, clarifies the balance source, and explains private and feed semantics. An agent has enough information to call and interpret this tool correctly.

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?

There are no input parameters, so parameter semantics are not a meaningful burden here. The baseline for zero parameters is a 4.

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 specific verb and resource—listing the business's bank accounts—and immediately enumerates the returned fields. It is clearly distinguishable from sibling tools like create_bank_account or update_bank_account.

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?

It gives strong interpretive guidance for using the results, especially that private accounts must not be counted as business cash and that feed status must be read rather than guessed. It does not explicitly compare against nearby alternatives, so it falls short of a 5.

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