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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the core behavioral safety profile is carried by metadata. The description adds a conditional disclosure ('test fee when the FAA states it') and says facts come with sources, but does not describe error behavior or what happens when a fact is unavailable. This is adequate given the annotation coverage.

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 a single run-on enumeration but each clause contributes a distinct fact category, so nothing is filler. It could be restructured with semicolons for readability, but it remains scannable and front-loaded with 'Official facts about an FAA knowledge test'.

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 one-parameter read-only lookup with 100% schema coverage and no output schema, the description provides a detailed list of returned fact categories, which is enough for correct selection. It does not specify units or formatting, but that is unlikely to block correct invocation of a facts-retrieval 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?

The schema covers 100% of the parameter: 'exam' has a full description and enum values with exam-specific codes. The description mentions Part 107 but adds no syntax or parameter-level meaning beyond the schema. Baseline 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 clearly identifies the resource (FAA knowledge test facts) and enumerates the exact fact categories returned, making its purpose concrete. It does not explicitly contrast with siblings like practice_questions or cost_of_failing, but the content list clearly marks it as a factual reference tool.

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?

No explicit when-to-use or when-not-to-use guidance is given, and no alternative tools are named. However, the description implies it is for retrieving official test facts for one of the FAA exams, which is enough for a simple one-parameter lookup.

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