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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile is fully covered structurally. The description adds genuinely useful interpretive context (integer minor units, YYYY-MM-DD / YYYY-MM conventions) but says nothing about what the response contains, whether archived accounts are included, or ordering.

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?

Short and dense: a field fragment followed by two convention sentences, with no filler or repetition. The format rules earn their place given there is no output schema to document units and date formats.

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 parameters and no output schema, the description is the only channel for return-value semantics, and it covers field names, amount units and date formats. It still leaves gaps an agent would care about: whether archived accounts appear in the result, what the default ordering is, and how the 'owner = null means joint' rule should be interpreted in output.

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 the baseline is 4 and there is no parameter meaning for the description to supply. Nothing in the text contradicts the 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 resource is unmistakable ('Accounts: kind, currencies, owner..., archived'), but the description never states a verb or what the tool does with it. An agent can infer a listing from the name, but the text itself is a field glossary rather than a purpose statement and does nothing to distinguish this from siblings like get_balances or list_categories.

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 when-to-use guidance, no mention of alternatives (e.g. get_balances for totals, list_categories for the category tree), and no stated prerequisites or scoping. The agent must infer everything from the name alone.

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