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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is fully covered. The description adds only the ownership scope ('the trainer wrote'), which confirms the caller only sees their own authored plans. It says nothing about ordering, pagination, or whether inactive/archived plans are included.

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?

It is a single short fragment with no wasted words, so it is maximally concise. However, it is under-specified rather than well-structured: there is no clause that helps an agent decide between this and neighboring diet tools.

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 should indicate what a returned diet plan looks like (fields, count, ordering) and whether inactive plans are included; it provides neither. For a one-parameter read tool with annotations this is thin, leaving the agent to call it without knowing the response shape.

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 single studentId parameter is documented with a cross-reference to list_students. The description's 'for one student' merely restates the one-parameter scope without adding format or lookup detail beyond the schema.

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 sentence pairs a concrete resource (diet plans) with a clear scope (written by the trainer, for one student), so the agent knows exactly what comes back. It does not explicitly name how it differs from the singular get_diet_plan or get_diet_adherence, leaving sibling differentiation to inference from 'plans' vs 'plan'.

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?

There is no guidance on when to call this versus get_diet_plan (a single plan) or get_diet_adherence, and no stated prerequisites beyond the studentId requirement baked into the schema. The agent must guess the intended situation from the name alone.

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