get_calendar_changes

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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, which covers the safety profile. The description adds useful behavioral context by clarifying the data source (cache refreshes) and the kind of information returned (created/updated/deleted snapshots). It does not explain ordering, pagination, or potential staleness, but the output schema covers the return shape, so the description meets the annotation-adjusted bar.

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 a single sentence with no filler, repetition, or unnecessary clauses. It clearly front-loads the action, object, and scope, and every word contributes to the meaning.

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 read-only, idempotent tool with an output schema and simple optional parameters, this description is minimally sufficient. The cache-refresh context and event types are useful, but the lack of usage guidance and parameter elaboration leaves an agent to make several inferences. A stronger description would name a sibling alternative or state the intended use case more explicitly.

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%, and the description does not mention 'days', 'limit', or 'since' at all. The parameter names and defaults are helpful, but the tool description was expected to compensate for the empty schema descriptions and does not. Some context is implicitly provided by the cache-refresh framing, but it is not sufficient to count as meaningful parameter semantics.

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 specific action ('List') and a specific resource ('created, updated, and deleted item snapshots recorded by cache refreshes'). This makes the tool's purpose clear and differentiates it from calendar-item or upcoming-item tools. It does not explicitly name a sibling tool, but the object described is precise enough to avoid major ambiguity.

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 when to use the tool: when an agent needs to see created, updated, or deleted calendar item snapshots that were captured during cache refreshes. However, it offers no explicit guidance about alternatives, exclusions, or when not to use it. The method of selecting it over siblings such as list_upcoming or get_calendar_item is left to inference.

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