Estimate Future Time Off Balance

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

Without annotations, the description carries the burden of behavioral disclosure. It adds useful context about the return structure (array of time off types with specific fields) and indicates the operation is a calculation. However, it does not clarify behavior for edge cases (e.g., omitted date, past dates) or explicitly state that the operation is read-only and has no side effects.

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 two sentences, front-loaded with the main action, and every sentence provides substantive information. It avoids redundancy and is appropriately sized for a simple tool.

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?

For a low-complexity tool with good schema coverage and no output schema, the description is fairly complete. It explains the main purpose and return format. However, it omits behavior when the optional 'date' parameter is not provided, which is a minor 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?

The input schema provides 100% description coverage for both parameters (employeeId and date), including formats and purpose. The tool description adds no additional parameter semantics beyond what the schema already states, so the baseline of 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?

The description clearly indicates the tool calculates future time off balances for an employee, with the verb 'Calculate' and resource 'future time off balances'. It also lists the specific return fields (current balance, units, policyType, usedYearToDate), distinguishing it from sibling tools like get-time-off-requests or get-whos-out.

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 does not provide any guidance on when to use this tool versus alternatives. It does not mention prerequisites, typical scenarios, or explicitly contrast with sibling tools like get-time-off-requests. The use case is implied by the name but not stated as guidance.

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