compare_items

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

No annotations are provided, so the description must carry the full burden. It discloses that the tool returns pros/cons, comparison points, and a final verdict, which gives a good sense of behavior. It does not mention any side effects or limitations, but for a read-only comparison tool, this is adequate.

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 extremely concise, with a brief introductory sentence, usage guidance, and a clean parameter list. Every sentence is informative without redundancy.

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 low complexity (2 string parameters, no enums, no nested objects) and the presence of an output schema, the description covers all necessary aspects: purpose, usage, and parameter semantics. It is complete for an agent to invoke the tool correctly.

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 has 0% description coverage, but the tool description compensates by adding parameter descriptions (e.g., 'item_a — First item to compare (e.g. "Herman Miller Aeron".'). This adds meaning beyond the schema's titles, helping the agent understand the expected format.

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 resource ('two products, services, or options'), clearly stating the output is a structured comparison with verdict. Among many siblings, only 'pros_cons' is remotely similar, but this tool is distinct in producing a side-by-side comparison with verdict.

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?

Explicitly advises use for 'buying decisions, feature comparisons, or evaluating alternatives', providing clear context. However, it does not mention when not to use or list alternative tools, but the example usage is sufficient for guiding the agent.

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