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

Annotations already declare readOnlyHint=false, destructiveHint=false, and openWorldHint=true, so the safety profile is covered. The description adds genuine value by disclosing the asynchronous, out-of-band effect — students answer in the app later, not in this call's response. It still omits what the call returns, whether notifications are sent, and whether duplicate assignments are possible.

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 compact sentence with the action and the post-call behavior front-loaded; nothing is wasted. It is arguably too terse rather than too long, but structurally sound.

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 two-parameter, fully-documented schema with no output schema, the description covers the core effect. However, an agent calling a side-effecting assignment tool would benefit from knowing what is returned (assignment confirmation? ids?) and whether recipients are notified — neither annotations nor description address this.

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 both parameters are documented in-schema, including the source tools for each id. The description only reinforces the array/plural nature of student_ids and adds no syntax or format detail beyond the schema, so it sits at the baseline.

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 names a specific verb ('Assigns') and resource ('a check-in questionnaire') and states the recipient scope ('one or more students'). It is clearly distinct from list/get siblings, though it does not explicitly distinguish itself from the near-identical send_anamnesis, which is the closest ambiguous alternative.

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 use this versus send_anamnesis, list_checkin_templates, or get_checkins_overview, and no prerequisites stated. The schema hints that templateId comes from list_checkin_templates, but the description itself gives no when/when-not framing.

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