Class materials

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

Annotations already declare readOnlyHint and openWorldHint, so safety is covered; the description adds the otherwise-unknown return shape — materials grouped by topic with a Drive link for each attached file. With no output schema present, that return-format disclosure is the main value add, though pagination and coverage limits are unmentioned.

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?

Lead sentence delivers the resource and return shape up front, and the second sentence is a single purpose clause with example queries. Slightly example-heavy for a one-parameter tool, but no sentence is redundant.

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 read tool with one fully documented parameter and annotations covering safety, the description supplies what's missing: what the result looks like (topic grouping plus per-file Drive links). Nothing critical is absent, though an agent gets no sense of result size or whether all topics always appear.

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?

Only one parameter and the schema already documents it fully, including the pointer to get_my_courses for obtaining the ID. The description adds nothing about course_id, so the schema does all the work and 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 a specific resource (posted class materials for one class), its organization (grouped by topic), and its payload (Drive link per attached file). That distinguishes it cleanly from sibling tools such as get_assignments and get_announcements, which return different artifacts from the same course.

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?

Gives three concrete trigger phrasings ('What materials did my teacher post?', 'What did we cover in unit 3?', 'readings, slides and handouts'), which makes routing from natural user language straightforward. It does not explicitly exclude neighbors like get_announcements, so the boundary is inferred rather than stated.

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