calculate_ppf

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

No annotations are provided, so the description bears full responsibility. It discloses annual compounding and default tenure, but does not mention assumptions like constant annual deposit, maximum deposit limits, or that the rate is assumed fixed (PPF rate changes periodically). Some behavioral traits are left 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?

The description is two sentences, front-loaded with the key verb and resource. It is efficient, though the second sentence could be slightly more structured (e.g., bullet points). No wasted words.

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?

There is an output schema (not shown), so return value details are not required. However, the description does not mention constraints like PPF's maximum annual deposit or rate variability, which are important for realistic use. It is adequate but not fully comprehensive for the typical PPF context.

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 coverage is 0%, meaning the description adds no parameter info beyond the schema. It only mentions the default for 'years' (15) and implicitly the rate (7.1%), but does not explain 'annual_deposit' or 'annual_rate' semantics. For a 3-parameter tool with no coverage, the description should compensate more.

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 PPF maturity value for a fixed yearly deposit, and provides use cases like 'how much will my PPF grow to' and 'PPF maturity/corpus'. It effectively distinguishes from sibling tools by specifying the PPF investment type.

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 explicitly says 'Use for ...' and gives concrete scenarios. However, it does not mention when not to use this tool or point to alternatives among many sibling tools, like compound interest calculators or other small savings schemes.

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