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

Annotations already cover read-only, idempotent, open-world and non-destructive behavior, so the bar is lower. The description adds genuine context beyond them: the data is unverified owner reports rather than confirmed defects, which shapes how an agent should word its answer. No pagination or auth caveats, but this is a read-only summary tool.

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?

Three dense, front-loaded sentences: one for what the output contains, one for when to invoke, one for the data-provenance caveat. No filler and no repetition of the tool name or schema.

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?

There is no output schema, but the description enumerates the returned fields and the caller-controlled excerpt count. Given a simple 4-parameter read-only tool with fully documented parameters and complete annotations, nothing an agent needs to call or interpret it correctly 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 description coverage is 100%, with each of make, model, model_year and recent_limit documented with ranges, defaults and examples, so the baseline is 3. The description only echoes 'by make, model and model year' and gestures at 'most recent complaint excerpts' for recent_limit, adding no syntax or constraint detail beyond the schema.

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 (summarize) and resource (NHTSA owner complaints) plus the exact output facets: counts, crashes, fires, injuries, top problem areas, recent excerpts. This clearly separates it from sibling tools like get_vehicle_recalls, get_recall_details and get_safety_ratings.

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?

Gives an explicit trigger: 'Use when the user asks about common problems, reliability issues or what owners report about a car.' However, it never names the alternatives or states when NOT to use it (e.g., prefer get_vehicle_recalls for confirmed defect/recall questions), which is exactly the sibling boundary that matters here.

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