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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, so the safety profile is covered. The description adds valuable behavioral context beyond annotations: it only lists verified competitor prices, includes the check date and free alternatives, and explicitly says the tool will say so instead of guessing for other exams. No contradiction with annotations was found.

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: the main purpose ('Side-by-side prices and contents') appears first, followed by useful output details and a necessary caveat. Every clause earns its place without redundancy.

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 single-parameter read-only tool with rich annotations and no output schema, the description explains what the result includes (prices, contents, check date, free alternatives) and the verified-scope limitation. It is nearly complete, though it could explicitly tie the 'for other exams it says so' behavior to the exam enum values for extra clarity.

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%, so the single required 'exam' parameter is fully documented with its enum values. The tool description adds context about verified prices and common prep options but does not add new meaning to the exam parameter itself. With full schema coverage, a baseline of 3 is appropriate.

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 and resource: 'Side-by-side prices and contents of common prep options for an FAA exam.' It clearly distinguishes this from siblings like cost_of_failing or practice_questions by focusing on comparing verified competitor prices and contents, and it adds the scope detail that only Part 107 data is currently verified.

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 implies usage: call this when you need side-by-side prices and contents of prep options. It also notes the limitation that only Part 107 competitor prices are verified, so it signals when expectations should be lowered, but it never names alternatives or explicitly says when not to use this tool versus siblings like study_plan or cost_of_failing.

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