Get Budget Status

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

With no annotations provided, the description carries the full burden, and it does disclose that empty month defaults to current month. However, it does not state whether this is read-only, what happens if no budget is set, or what data source the comparison relies on. It adds the default behavior but leaves other behavioral traits implicit.

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?

Two sentences convey the core action and the default handling with zero filler or redundancy. The primary purpose is front-loaded, and every sentence earns its place.

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?

Given the single optional parameter and the availability of an output schema, the description is almost sufficient for correct invocation. It covers the return-input behavior and default; a slight gap is that it does not orient the agent relative to related budget/summary siblings or mention preconditions, but the output schema fills the return-value gap.

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 description's 'YYYY-MM' and current-month default duplicate what is already in the input schema. The description adds no extra meaning beyond schema, so the baseline 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 verb and resource: 'Compare actual spending vs budget for a given month,' which clearly identifies the tool's function. It is distinct from siblings like get_expense, set_budget, and get_monthly_trend because it focuses specifically on budget-versus-actuals status for a month.

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 description provides clear context about the input month and the default current-month behavior, but it does not explicitly tell the agent when to choose this tool over siblings such as summarize_expenses, get_monthly_trend, or get_category_breakdown. The when-not/exclusion guidance is implied rather than stated.

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