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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The description adds the point-in-time semantics ('in effect on one date') and discloses the underlying endpoint, but says nothing about auth requirements or what happens when no settings exist for the date.

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?

Two short sentences with the purpose front-loaded and the endpoint detail trailing as supporting evidence. Nothing is padded or redundant.

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 single-parameter read tool with no output schema, the description states the resource returned (settings and goals) and the temporal scoping, while annotations cover the safety profile. Nothing an agent needs to invoke it correctly 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% for the single cdate parameter (type, date format, UTC convention), so the schema carries the parameter burden. The description only echoes the concept of 'one date' without adding format or timezone detail beyond it, which is the baseline when the schema is complete.

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?

States a specific resource (nutrition settings and goals) with a clear temporal scope ('in effect on one date'), which separates it from the food-log and meal siblings. It does not explicitly name those siblings, but the settings-vs-log distinction is inferable from the noun.

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 is only implied: an agent can infer it retrieves the settings applicable to a given day. There is no statement of when to prefer this over get_goals, get_user_settings, or the other nutrition siblings, and no prerequisites are mentioned.

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