get_nutrition_scores

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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint. The description adds value by detailing the return structure: category scores, consumed amounts, confidence levels, and default date behavior. No contradictions.

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?

Every sentence is informative. The first sentence captures the core purpose. The second elaborates on return structure. The third provides usage guidance. There is no fluff or repetition, and it is well-structured.

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 description explains the return content (categories, amounts, confidence) and date parameter behavior. With an output schema present, it does not need to detail every field. It is complete for understanding what the tool does and its main input. Minor gap: no mention of error conditions or timezone, but acceptable.

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 only parameter 'date' is described with format YYYY-MM-DD and default behavior (defaults to today). This adds meaning beyond the input schema, which only specifies string|null with no format or default. Schema coverage is 0%, so the description compensates well.

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 retrieves nutrition scores with per-nutrient consumed amounts and category grades. It explicitly distinguishes itself from siblings by calling it 'the richest nutrition endpoint' and contrasting with simpler endpoints like get_daily_nutrition.

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?

Provides explicit guidance on when to use: 'when you need to know both how much of each nutrient was consumed AND how close each is to the target.' Does not explicitly mention when not to use or name alternatives, but the context is clear.

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