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

There are no annotations, so the description must carry the full burden. 'Compare' signals a read-only information-gathering behavior and the listed dimensions, but it does not disclose what the tool returns, whether it triggers any follow-up, or any side effects or limitations. The behavior is clear at a high level but not deeply transparent.

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?

A single sentence, front-loaded with the action and resource, and every word adds semantic value. No redundant filler or repetition of the tool name.

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 zero-parameter comparison tool, the description is largely complete: it names the resource and the comparison dimensions. However, with no output schema and no annotations, it would benefit from an explicit statement of what the result contains (e.g., a list or comparison result), so it is not a 5.

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 tool has zero defined parameters, which sets a baseline of 4 because there are no parameter semantics to explain. The schema's additionalProperties: true is unconstrained, and the description adds no guidance on optional inputs, but this is not required for a no-parameter call.

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 uses a specific verb ('Compare') and a precise resource ('business checking accounts'), and lists the comparison dimensions of features, fees, and transaction limits. This clearly separates it from sibling tools that cover personal banking, savings, loans, or credit cards.

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 clearly establishes the intended context: use this tool when a business checking account comparison is needed. It does not explicitly enumerate exclusions or name alternatives, so it stops short of a 5, but the context is unambiguous given the sibling set.

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