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

Annotations already declare readOnlyHint and openWorldHint, so the description needn't carry the safety profile. It does add the meaningful edge case that no grade is returned unless an attempt has been graded, which is real behavioral signal beyond the annotations, but it says nothing about the return shape for ungraded cases beyond that.

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 front-loaded sentence with no wasted clauses; the scope and conditional caveat arrive immediately. The line-wrap formatting is the only minor blemish.

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 at full schema coverage, annotations covering read-only behavior, and an output schema handling return values, the description covers purpose, scope, and the ungraded edge case adequately. Only explicit sibling routing is missing.

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 coverage is 100% and the schema itself points the agent to list_quizzes for obtaining the id, so the structured data does the heavy lifting. The description adds no parameter elaboration beyond what the schema already states.

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 ('Get this account's best grade on one quiz') with a scope qualifier ('this account's') and a best-grade aggregation that distinguishes it from a plain attempt listing. It doesn't name a sibling explicitly, but 'best grade on one quiz' contrasts clearly with get_quiz_attempts and get_grades without that.

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 conditional 'if any attempt has been graded' implies the tool only returns a grade when a graded attempt exists, which is useful context. But there is no explicit when-to-use vs alternatives, no exclusion, and no naming of sibling tools like get_quiz_attempts or get_grades_overview.

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