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

Annotations already declare readOnly, idempotent, openWorld and non-destructive behavior, so the safety profile is covered. The description adds one genuinely behavioral caveat beyond that (absence of activity is not evidence of availability), but says nothing about scope limits, timezone handling, or result size for a date-range query.

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?

It is short and contains no padding, and the caveat it does state is front-loaded. However, the terseness comes at the cost of the essential content, so it reads as under-specification rather than disciplined concision.

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?

With no output schema, no parameter documentation, and no annotation coverage of return content, the description is the only source of behavioral guidance and it provides a single caveat. An agent cannot tell what a calendar entry looks like or what the range bounds mean from this definition.

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 0% for both required parameters, so the description carries the full burden of explaining start and end. It supplies no information about them — no range semantics, no inclusivity, no timezone — leaving the agent to infer everything from the date pattern alone.

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 name get_calendar supplies the verb+resource, but the description never states what the tool does. 'Confirmed public activity' is a fragmentary characterization of the returned content rather than a purpose statement, and it does not differentiate this tool from siblings like get_events or get_center.

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 clause 'empty dates do not mean availability' is a useful interpretation caveat, but there is no explicit when-to-use guidance, no prerequisite conditions, and no routing to an alternative sibling when the agent needs a different view of the data.

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