expense_budget_vs_actual

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. 'Compare' suggests a read-only analysis, but it doesn't specify whether this tool requires specific permissions, how results are returned (e.g., as a report, chart, or data), or any limitations like data freshness or access constraints. For a tool with no annotation coverage, this leaves significant behavioral gaps.

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 a single, efficient sentence with zero waste. It's front-loaded with the core purpose and uses clear language. No unnecessary words or redundant information are present, making it highly concise and well-structured.

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 complexity (3 required parameters, no output schema, no annotations), the description is incomplete. It doesn't explain the input parameters, output format, or behavioral traits. For a comparison tool that likely returns structured data, more context is needed to guide effective use by an AI agent.

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 0%, meaning none of the three parameters (budgetId, startDate, endDate) are documented in the schema. The description mentions 'budget' and implies a time frame but doesn't explain what budgetId refers to, the date format, or whether dates are inclusive/exclusive. It adds minimal semantic value beyond what's inferred from parameter names.

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 'Compare actual expenses against budget' clearly states the verb ('compare') and resources ('actual expenses', 'budget'), making the purpose understandable. However, it doesn't differentiate this tool from potential siblings like 'expense_summary_report' or 'expense_forecast', which might also involve expense comparisons. The purpose is clear but lacks sibling distinction.

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 no guidance on when to use this tool versus alternatives. With many sibling tools related to expenses, budgets, and analytics, there's no indication of whether this is for historical analysis, forecasting, or specific contexts. No explicit or implied usage context is provided beyond the basic purpose.

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