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

Annotations already declare readOnlyHint=true, idempotentHint=true and destructiveHint=false, so the safety profile is covered. The description adds that it aggregates the signed-in user's stack against recommended values, which is useful, but it says nothing about granularity (per-nutrient vs overall), empty-stack behavior, or freshness — and there is no output schema to fall back on.

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 sentences with no waste: the first front-loads the usage trigger and the second states what the call returns. Sized appropriately for a zero-parameter read tool.

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 no-arg, read-only tool with no output schema, the description conveys the essential shape of the result (daily totals vs recommended amounts). Minor gaps remain around result granularity and behavior when the stack is empty, but nothing blocks correct invocation.

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 tool takes zero parameters, so the baseline is 4 and there is no ambiguity for the description to resolve. Nothing misleading is stated about inputs.

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?

Names a specific verb+resource ('Returns the daily nutrient totals from the signed-in user's stack') and specifies the comparison against recommended values. It is clear on its own, but it does not distinguish itself from close siblings like suppco_get_my_nutrient_plan or suppco_get_my_stack, so an agent must infer the boundary.

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?

Gives an explicit trigger ('Use this when the user asks how much of a nutrient their current supplements provide, or whether they are over or under recommended amounts'). That is strong when-to-use guidance, though it names no alternative or exclusion to route against the nutrient-plan and stack tools.

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