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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so safety profile is known. Description adds scoping constraints (baby, date range, feed types) which are useful. It doesn't mention pagination or ordering, but the presence of an output schema reduces the need for return-format details.

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 a single sentence, front-loaded with the action and resource, and contains no filler or redundant information. It is efficient and easy to parse.

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 simple list operation with three required parameters, an output schema, and safe annotations, the description covers all essential aspects: what it lists, scope, and parameter context. No critical missing details.

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 provides 100% coverage with detailed descriptions for all three parameters (babyId UUID, start/end flexible date-time formats). The description's mention of 'date range' adds little new meaning since parameters already explain that. Baseline 3 is appropriate given full schema coverage.

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 a specific verb ('List') and resource ('feeding entries') with subtypes (breast, bottle, solids) and scope (baby, date range). This distinguishes it from sibling tools like list_sleep and list_nappies, which cover different resource types.

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?

Usage context is clear: use this tool to list feeding entries for a baby within a date range. It doesn't explicitly state when not to use it or mention alternatives, but the scope is well defined and sibling tools cover distinct domains (sleep, nappies, diary).

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