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

Annotations already declare readOnlyHint, openWorldHint and destructiveHint=false, so safety is covered. The description adds real value beyond them: default ordering (newest created first), the sort shift when a date filter is applied, and an explicit inventory of returned fields (title, start/end, RSVP stats, landing-page links). It omits auth/rate-limit behavior, but the core operational traits are disclosed.

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?

Two compact sentences, front-loaded with purpose and ordering, then filters. No filler, and the endpoint tag (GET /events) is a useful trailing anchor.

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, the description compensates by listing returned fields, and all 11 parameters are fully documented in the schema. Pagination mechanics are covered by the schema. Only minor gaps remain, such as guidance on combining filters or expected result-size limits.

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%, so the baseline is 3. The description earns a bump by documenting behavior the schema does not: that results are 'newest created first' by default but switch to ordering by start time once a date filter is used, which clarifies the interaction between the date params and sort_by.

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?

States a specific verb and resource ('Search the account's events') and enumerates the returned fields, so the agent immediately knows this is a filtered read over the event collection. It never names an alternative sibling (e.g., addevent_get_event for a single event), so it falls short of full sibling differentiation.

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 filter list ('calendar, event ids, text, date window or a custom_data pair') implies when this tool is appropriate, and the sort note implies how it behaves under a date filter. However, there is no explicit when-to-use vs when-not guidance and no pointer to sibling tools like get_event or list_calendars.

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