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

Annotations already declare readOnlyHint=true, idempotentHint=true, openWorldHint=false, and destructiveHint=false, which fully cover the safety profile. The description adds no behavioral context beyond that—no auth needs, rate limits, calculation assumptions, or limitations—and the stated return field is covered by the output schema.

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 two sentences and front-loads the main purpose efficiently. The second sentence mixes a return value that is already covered by the output schema with a cross-reference to list_bundles, so not every clause earns its place, but overall it remains compact.

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 calculation tool with annotations covering safety and an output schema available, the description identifies the inputs and output sufficiently. The slight tension between 'daily dog food quantity' and returning 'kcal_per_day' is resolved by the output schema, so no critical invocation detail is missing.

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 0%, so the description must compensate, but it only restates parameter names (weight, age, activity level) without explaining units, enum meanings (puppy/adult/senior, low/medium/high), or constraints. It adds minimal meaning beyond the schema property names.

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 states a specific verb (Calculate) and resource (daily dog food quantity) and names the three input factors. It is clear but does not differentiate from closely related siblings like calculate_cat_food or calculate_pet_food_portion; the reference to list_bundles is not a sibling calculator comparison.

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 gives no explicit when-to-use guidance, no prerequisites, and no alternatives to this tool. The reference to list_bundles points to a bundle discovery tool, not to when this calculator should be chosen over another.

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