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

There are no annotations, so the description bears the full burden. 'Get' implies a read-only operation and 'random' indicates non-determinism, but the description does not disclose whether this is an external network call, what kind of response to expect beyond the output schema, or any failure or availability caveats.

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 core phrase 'Get random date trivia' is compact and front-loaded, but the empty '[COST: ]' prefix is unnecessary noise and adds no value. It is concise but slightly marred by this placeholder and lacks any supporting context.

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 no-argument tool this is close to minimal, but the description provides no help in differentiating among the large set of sibling trivia/fact tools. It does not clarify how date trivia differs from year trivia, general trivia questions, or other similar fetch tools, leaving selection ambiguous.

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, so the baseline is 4. The description adds no parameter-specific meaning, but none is required because the input schema already shows an empty properties object.

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 clear verb ('Get') and a clear resource ('random date trivia'), which conveys the core purpose. It is distinguishable from siblings like get_year_trivia by the 'date' focus, though it does not explicitly name the alternative or define what counts as date trivia.

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 intended use is implied by the description: when the user wants random date trivia, this tool is a fit. However, there is no explicit guidance about when not to use it or how it differs from similar trivia tools such as get_year_trivia, get_math_trivia, or get_trivia_question.

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