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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint and destructiveHint=false, so the safety profile is covered. The description adds real value beyond that by scoping the tool's limits: general information only, no diagnosis/treatment, no personalized dosing advice. It does not disclose return format or citation behavior, which keeps it short of a 5.

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 sentences, front-loaded with the trigger condition, then the output contents, then the disclaimer and the sibling routing. Every sentence carries information an agent needs; nothing is padding.

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 no output schema, the description compensates by enumerating what comes back (intake ranges, upper limits, timing, food guidance, graded research summary). Combined with the scope disclaimer and the routing pointer, an agent has everything needed to select and call this tool correctly.

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% and the single parameter already documents itself with concrete examples ('Vitamin D3', 'Magnesium', 'Fish Oil'). The description only restates the parameter as 'a specific nutrient or supplement', adding no syntax, aliasing, or format guidance beyond the schema, so baseline 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?

Names a specific verb+resource and enumerates exactly what 'nutrient info' contains: typical daily intake ranges, upper limits, timing, food interactions, and a graded research summary. It also explicitly distinguishes itself from the sibling suppco_search_effects, so an agent can route without opening either schema.

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?

Opens with an explicit trigger ('Use this when the user asks about dosing for a specific nutrient or supplement') and names the alternative with the condition that selects it ('For what studies say about a supplement for a specific health area, use suppco_search_effects'). Both when-to-use and when-to-use-something-else are covered.

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