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

No annotations are present, so the description carries full responsibility for disclosing behavior. It only states it gets a random trivia question, with no mention of return format, randomness semantics, rate limits, or side effects. For a read-only fetch operation, this is a significant gap.

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 very short and front-loaded with the action, but it includes a placeholder '[COST: ]' that provides no value and appears to be a leftover from a template. This reduces conciseness quality, though the core sentence is efficient.

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 the existence of an output schema and the trivial nature of the tool, the description could suffice, but it fails to clarify how this differs from specific trivia siblings (date, math, year). The lack of annotations and the placeholder further reduce completeness for an agent deciding when to call it.

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 tool has zero parameters, and the schema coverage is trivially 100% (empty schema). Per the rubric, a 0-parameter tool receives a baseline of 4, and the description adds nothing needed since no parameters exist.

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 verb 'Get' and the resource 'a random trivia question', which is specific and actionable. However, it does not differentiate from sibling tools like get_date_trivia or get_math_trivia, which also deal with trivia categories, leaving some ambiguity about scope.

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?

There is no guidance on when to use this tool versus alternatives. With many similar get_* tools, the agent receives no hint about whether this is the general-purpose trivia or a specific category, and no exclusions or conditions are provided.

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