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

The annotations already indicate non-read-only, non-destructive, idempotent behavior. The description adds valuable context beyond those annotations: it can take a few minutes, it is free for signed-in students, and it uses a generator and verified resource catalog. The retry guidance about reusing requestId with identical input meaningfully complements the idempotentHint annotation.

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 compact and front-loaded with the core action. Each sentence contributes useful information: purpose, access constraint, latency expectation, and retry behavior. It avoids fluff, though slightly more structure around parameter meaning could improve it.

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 mutating, idempotent tool with a timeout and an output schema, the description covers the key operational concerns: cost/access, expected duration, and retry handling. It does not explain prerequisites like how to obtain a valid subjectSlug or what should be passed in scope, but the output schema and sibling tools partially cover that context.

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 only 20%, with only requestId documented in the schema. The description broadly maps inputs to 'topic and available time,' but it does not explain subjectSlug, scope, timeAmount, or timeUnit semantics enough to compensate for the low schema coverage. More specific parameter guidance would be needed for reliable invocation.

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 states a specific action ('Creates and saves') on a clear resource ('trackable Fiveable study plan') with explicit inputs ('topic and available time'). It clearly identifies a creation operation distinct from the get/list/update siblings, though it does not explicitly name those alternatives.

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 gives no explicit guidance on when to use this tool versus alternatives like get_study_plan, list_my_study_plans, or update_study_plan_tasks. It mentions that it is free for signed-in students, which implies an access condition, but it does not state when not to use the tool or which sibling should be chosen instead.

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