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

Annotations already declare readOnlyHint, idempotentHint and destructiveHint=false, so the description's contribution is the extra context it supplies: no authentication required, nothing is written back to Recipe One, and dietary/nutrition values are caller-supplied rather than computed. Those are real behavioral facts not present in the annotations.

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?

Three short sentences, front-loaded with the core action, each carrying distinct information (what it renders, auth/persistence stance, calculation scope). No redundancy or filler.

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 two-parameter tool with a fully documented schema and no output schema, the description covers what an agent must know: the two outputs produced (calendar and shopping list), that nothing is persisted, and that nutrition is not derived. Nothing necessary for correct invocation 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 100%, so the recipes/meals structure, enum units, date patterns and array limits are fully documented by the schema. The description adds no parameter-level meaning beyond noting that nutrition and dietary data are supplied by the assistant, which only loosely constrains what goes in the recipes payload.

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 names a specific verb pair and resource set: render a meal plan as an interactive calendar and combine its ingredients into a shopping list. It implicitly separates itself from save_recipe and add_to_meal_plan via 'Draft recipes and meals are not saved to Recipe One', though no sibling is named outright.

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?

It establishes the usage context clearly: this is an ephemeral, no-sign-in preview path for data already created in the conversation, not a persistence path. It never explicitly names an alternative tool or an exclusion (e.g. 'to save, use save_recipe'), so it stops short of a 5.

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