calculate_home_vs_rent

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

Annotations provide readOnlyHint=true and idempotentHint=true, so the safety profile is clear. The description adds no extra behavioral details (e.g., assumptions, output specifics), but given annotations cover the key aspects, a 3 is appropriate.

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?

Two sentences with zero wasted words – 'Compare buying vs renting financial outcome. Use when deciding between buying a home or renting.' Every sentence adds value.

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 tool has an output schema (not shown but present), so return values are documented. The description covers the main purpose and usage. It could mention the output type briefly, but with high schema coverage and annotations, it's nearly complete.

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 100%, so all parameters have individual descriptions. The tool description does not add extra semantic meaning beyond the schema; it only gives a general overview. Baseline 3 is correct.

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 'Compare buying vs renting financial outcome', which is a specific verb and resource. It distinguishes itself from sibling tools that are other calculators (e.g., tax, EMI) by focusing on the unique decision of homeownership vs renting.

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?

It says 'Use when deciding between buying a home or renting', which explicitly states the context. No when-not or alternatives are given, but siblings are unrelated so exclusion is implicit.

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