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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The description adds domain context about the permission model (personal vs course/group entries) but says nothing about freshness of the permission data, caching, or auth requirements; the existing output schema covers the return shape.

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?

Two short sentences with the core purpose front-loaded and the interpretive hint second. The awkward source line breaks cost it nothing, but the phrase 'typically' is a bit hedging for a permissions check.

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 parameters, an output schema defining the return values, and annotations covering the read-only profile, the description provides everything an agent needs to decide to call it and how to interpret the result.

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?

The tool takes zero parameters, so there is nothing for the description to disambiguate. Baseline 4 applies; no parameter semantics are missing.

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?

States a specific verb and resource (check this account's calendar-management permissions) and clarifies what the answer means by contrasting student accounts (personal entries only) with course/group entries. It is clearly distinguishable from calendar-action siblings like create_calendar_event or list_calendar_events, though it doesn't explicitly name an alternative access-info tool.

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?

The description implies when the tool is useful (you want to know whether the account can manage course/group calendar entries), but it never states an explicit when-to-use, prerequisite, or alternative. An agent must infer that this should be called before attempting calendar mutations.

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