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

Annotations already indicate this is a mutation (readOnlyHint=false), and the description/schema add useful behavioral constraints: the budget must be P&L with one amount per account per period, and sensitive data like SSNs, tax IDs, birthdays, and card-processing details must not be sent. It does not describe response shape or duplicate-handling behavior, but the added constraints go beyond what annotations convey.

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 main description is two concise sentences with the core action first and the qualifying scope second. The longer entity parameter description is dense but every phrase contributes required field, enum, array-shape, or privacy information.

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?

The definition provides enough information to construct a valid request: entity fields, acceptable enum values, company selection, and a privacy warning are all covered. There is no output schema and the nested AccountRef/date formats are not fully spelled out, leaving a small gap, but nothing essential for invoking the tool correctly is missing.

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?

Both parameters have schema descriptions (100% coverage), and the entity parameter description adds substantial meaning beyond the bare object type. It enumerates the required budget fields, allowed BudgetType and BudgetEntryType values, the BudgetDetail array shape, and a clear privacy restriction.

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 uses a specific verb and resource: "Create a budget in QuickBooks Online." The second sentence narrows the scope to "a profit-and-loss budget with one amount per account per period," which clearly distinguishes this from the get/search/update/delete budget siblings and from other create_* entity tools.

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 intended use is explicit: call this when creating a new QuickBooks budget, specifically a profit-and-loss budget. It does not explicitly mention when not to use it or point to update_budget/search_budgets as alternatives, but the create verb and the P&L constraint make the selection context unambiguous.

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