GroupClassesUpdate

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

Annotations already indicate this is a non-read-only, non-idempotent, and non-destructive operation. The description adds little beyond 'existing,' and does not disclose partial update semantics, permissions, validation behavior, or effects on associated pupils/schedule.

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?

The description is a single compact sentence with no filler and the core purpose is front-loaded. It is brief, though it could have included one useful qualifier about which fields are updatable or partial update behavior.

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 simple update tool, the schema plus annotations provide enough to make a basic call, but important context is missing: whether the body fields are partial updates, what happens to unspecified fields, and how this relates to GroupClassesChangeTeacher. No output schema exists, so return behavior is also not described.

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%, so the schema documents all parameters. The description adds no additional meaning beyond the schema, which is the baseline situation when coverage is high.

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 states a specific action and resource: 'Update an existing group class.' It clearly distinguishes from create/delete/get siblings by the 'update existing' framing. However, it does not differentiate from the closely related GroupClassesChangeTeacher sibling, which also updates part of a group class.

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?

No explicit guidance is provided about when to use this tool versus alternatives. It does not mention GroupClassesChangeTeacher for teacher changes, nor does it state when GroupClassesUpdate should be preferred. The only implied context is that the group class already exists.

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