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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=true, so the safety profile is covered. The description adds only the scope of returned data and says nothing about behavior beyond that — e.g. whether rules are the effective/resolved set, what happens for a day with no plan, or timezone assumptions.

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?

A single tight sentence, front-loaded with the verb and resource, with no redundant wording. The trailing "the rules that apply" is slightly vague but the overall density is appropriate.

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?

With one fully documented parameter and no output schema, the description's enumeration of returned contents is genuinely load-bearing and sufficient for an agent to call it correctly. Minor gaps remain around empty days and rule resolution, but nothing essential 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 coverage is 100% and the schema's date property already explains the ISO format and natural-language resolution ("tirsdag", "i morgen"). The description contributes no additional meaning about the date parameter, so the baseline of 3 applies.

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?

Uses a specific verb ("Read") with a bounded resource ("one day") and enumerates what the day contains: dinner, its time, calendar, meal events, and applicable rules. This clearly marks it as a per-day aggregate, distinguishing it from single-facet siblings like get_planned_dinner, get_calendar_events, get_meal_events, and get_rules, though it never names those alternatives explicitly.

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 aggregated contents imply the use case (get everything about a specific day in one call), but there is no explicit statement of when to prefer this over the narrower siblings, nor any exclusions or prerequisites such as the day needing to exist or be planned.

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