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 the sourcing detail (coach mode, in person), which is genuine context beyond annotations, but says nothing about ordering, pagination, or result volume for a list operation.

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 front-loaded sentence that identifies the resource and its scope with zero filler. Nothing is wasted and the key qualifier ('in person, coach mode') leads.

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 parameter at full schema coverage, no output schema, and annotations carrying the safety profile, the description covers what the agent needs to select and call it. It stops slightly short on result behavior (ordering, volume), which an agent might still want.

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 schema itself says studentId comes from list_students. The description adds no additional meaning beyond that, so the baseline 3 for a fully documented schema 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?

The description defines a specific resource: in-person sessions run by the trainer via coach mode. That distinguishes it from generic session lists by scope, but it does not explicitly name which of the many session siblings (list_student_sessions, list_recent_sessions, list_live_sessions) this replaces or complements.

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 explicit when-to-use guidance and no alternative tool is named. The phrase 'from the app's coach mode' implies context but never tells the agent when to pick this over list_student_sessions or list_recent_sessions.

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