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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It hints that multiple holidays may exist ("Send only the one") but does not state the return format, how many results are returned, whether the selection is random or ordered, or any side effects. The instruction to send is aimed at the agent, not the tool's behavior.

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 exceptionally compact: two short sentences, no filler, and the core retrieval purpose is front-loaded. The second sentence adds useful selection guidance without bloating the description.

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 zero-parameter getter, invocation is simple, and the description conveys the main purpose and a usage cue. However, with no output schema and no annotations, it leaves the return value unspecified—an agent still has to guess whether it receives a list, a string, or structured objects.

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 input schema is empty with zero parameters, so parameter documentation is trivially complete. The baseline of 4 applies; the description does not need to add parameter meaning when there are no parameters to explain.

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 as today's micro-holiday and implies a retrieval action via "What micro-holiday is it today?" It is distinct from sibling tools like get_phrases and get_offers since it specifically targets holidays. It falls short of 5 because it lacks an explicit imperative verb such as "Gets" or "Returns."

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 for surfacing today's micro-holiday and instructs to pick the one the human would enjoy, giving some selection guidance. However, it never explicitly says when to prefer this tool over siblings like get_phrases or get_offers, nor does it provide exclusions or alternatives.

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