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

Annotations already declare readOnly, idempotent, non-destructive and closed-world, so the safety profile is covered. The description adds real value by disclosing that locked courses are returned but modules are only included for open ones, which explains partial/inconsistent payload depth. It still says nothing about pagination, ordering, or size limits.

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?

One dense sentence with no filler, and the scope condition ('open or locked for you') is placed early. Slightly elliptical phrasing ('for you', 'open ones') costs it a point but nothing is wasted.

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 required parameter, no output schema, and full annotation coverage, the definition covers the essentials for invoking the tool. It remains thin on what a returned course or module actually contains and whether results are paginated, which matters for a listing tool with no output schema.

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 single 'group' parameter is fully documented in the schema with an example format. The description references 'the group's Classroom' but adds no syntax or format detail beyond the schema, so the baseline of 3 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?

States the resource ('Courses in the group's Classroom') and the scope ('open or locked for you, with the modules of open ones'), which is specific enough that an agent can distinguish it from get_course or create_course. However, it never names the sibling it contrasts with, so differentiation relies on the tool name rather than the description.

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 guidance on when to call this versus get_course (single course) or other list tools, and no stated prerequisites such as group membership. The 'list' vs 'get' distinction is only inferable from the tool name, not the description text.

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