calendar-get_or_create_day

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

No annotations are provided, so the description bears responsibility for behavioral disclosure. It correctly states the tool may create a month if needed, but lacks details about side effects (e.g., whether existing days are overwritten) or return values.

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?

A single, well-structured sentence conveys the core functionality without extraneous words. Every detail earns its place, making it highly efficient for an agent to parse.

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 tool's simplicity (1 parameter, no output schema), the description sufficiently covers the essential behavior: getting or creating a day and creating a month if needed. It could mention return type but is complete enough for its complexity.

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 coverage is 100% for the single parameter. The description adds no additional meaning beyond the schema's declaration of ISO8601 format. Baseline 3 is appropriate as the description does not compensate for any missing schema detail.

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 uses specific verbs 'gets or creates' and clearly identifies the resource as 'calendar day'. It also distinguishes from sibling 'calendar-get_or_create' by noting automatic month creation, making the tool's scope clear.

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 mentions automatic month creation but provides no explicit guidance on when to use this tool versus alternatives like 'calendar-get_or_create'. Without usage context or exclusions, the agent must infer intent from the name alone.

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