Balance by day

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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The description adds the currency (USD) and the aggregation shape (daily values plus totals plus current balance), but says nothing about range limits, defaults, or pagination. With annotations carrying the safety burden, this is adequate-but-thin.

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?

A single sentence with zero filler, and the core return content is front-loaded. It is efficient, though its brevity borders on under-specification for a reporting tool with no output schema.

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 does the necessary work of naming what comes back: per-day earned/spent, totals, and current balance. Range defaults and limits live in the schema, so the remaining gap is only the missing routing guidance versus sibling stats tools.

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 description coverage is 100%, and the schema fully documents both date_start and date_end including formats, defaults, and the 60-day/90-day limits. The description adds no parameter semantics beyond that, so the baseline 3 applies.

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?

Names a specific resource and return shape: daily earned/spent in USD plus totals and current balance. An agent can tell it apart from list_orders or get_order_stats because the resource is account balance, but the description never explicitly contrasts itself with the sibling stats tools (get_order_stats, get_rtb_stats), so it stops short of full differentiation.

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 prerequisites, and no named alternative. The agent must infer that this is the balance-reporting tool from the description alone; nothing tells it when this tool is preferable to the other stats/report tools in the sibling list.

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