calculate_payout_period

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It explains the algorithm ('Payout is the first month where cumulative cash flow >= 0') and notes that the first element in cash flows is typically negative, which is helpful. However, it does not address edge cases like when cumulative cash flow never reaches zero.

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 concise with two sentences explaining purpose and definition, plus a brief parameter note. It front-loads the core concept. Slight improvement could be further condensing the parameter detail without losing clarity.

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 presence of an output schema, return value explanation is not required. The description covers the input and logic well but omits potential error conditions (e.g., non-convergence). Enough for basic usage, but could be more robust for a financial calculation tool.

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?

Although the context reports 0% schema description coverage, the description includes an 'Args' section explaining the cash_flows parameter: 'Monthly cash flows ($). First element is typically negative (capex).' This adds meaningful semantics beyond the schema, which only specifies type and array structure.

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 states the tool calculates payout period (months to recover initial investment) and defines it as the first month where cumulative cash flow >= 0. This verb+resource combination is specific and distinct from sibling tools, which cover other financial metrics like NPV, IRR, or breakeven price.

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 implies usage for computing payback period without offering explicit guidance on when to use this tool versus other financial calculation tools (e.g., calculate_npv, calculate_irr). No when-not-to-use or alternative recommendations are provided, relying on the tool name and context.

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