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

The description adds significant behavioral context beyond annotations: it confirms read-only nature (already annotated), specifies authentication and parent-only access, explains default parameter behavior, and warns of error for unlinked children. No contradiction with annotations.

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?

The description is brief and front-loaded with key constraints ('Auth-only. Parent-only.'), then explains the output and defaults in a few sentences. No wasteful wording.

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?

Given no output schema, the description adequately explains the returned data (accuracy, missed words, duration). It covers parameter defaults, error conditions, and constraints, making it fully informative for this simple read tool.

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 descriptions already state the defaults. The main description restates these defaults without adding new semantic information. Thus, per the baseline for high coverage, score is 3.

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 clearly states the tool retrieves a detailed breakdown for a single child's study/quiz session, specifying components like accuracy, missed words, and duration. It distinguishes this from sibling tools like get_session_detail by emphasizing 'child' and 'parent-only', making the purpose unambiguous.

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 specifies 'Auth-only. Parent-only.' and 'Ownership-gated' indicating when to use and limiting scope to parent-child contexts. It also explains default behavior for missing parameters. However, it does not explicitly mention alternatives among sibling tools, such as when get_session_detail might be more appropriate.

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