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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint, so the safety profile is covered. The description adds meaningful behavioral context beyond annotations: the default date window, null timezone behavior, and unavailability of inactive/private events. No contradiction exists between the description and annotations.

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 three sentences with no wasted words. The core action is front-loaded, and each subsequent sentence adds a distinct behavioral or availability fact. It is appropriately sized for the tool's complexity.

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?

The description covers the main behavioral aspects, and the presence of an output schema means return values do not need to be explained. Still, it leaves some gaps: date string format is unspecified, the language parameter is not given any guidance, and sibling tool routing is left to inference. For a tool with zero schema-level parameter descriptions, these gaps matter.

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%, so the description must compensate for missing parameter explanations. It does add useful semantics for date_from and date_to by explaining the default UTC window and user-local date usage. However, it does not describe event_id semantics or the language parameter beyond what the name and enum already imply, leaving the compensation incomplete.

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 a specific verb and resource: 'Read public event facts and dated occurrences within a requested window.' It also adds scope by specifying public data and the window behavior, which makes the tool's role understandable. However, it does not explicitly contrast itself with the sibling search_events tool, relying instead on the name and read-vs-search framing.

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 provides useful invocation context such as the default UTC date window, user-local date handling for today/tonight, and the fact that inactive/private events are unavailable. It also implies that the tool is meant for reading known event facts rather than searching. However, it never explicitly states when to prefer get_event over search_events or get_guide, so the routing guidance is mostly implied rather than stated.

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