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

The annotations already declare readOnlyHint=true, so the safety profile is covered. The description adds the returned field set and notes the underlying GET endpoint, mildly reinforcing read-only semantics, but says nothing about auth requirements, rate limits, or behavior when the event is missing.

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 sentences plus a short endpoint reference, with the resource and key fields front-loaded and zero filler. Every clause earns its place.

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 usefully enumerates the primary return fields, which an agent would otherwise lack. For a simple 2-parameter read operation this is close to sufficient, though it omits expansions behavior and error conditions.

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 100%, so baseline is 3; the description goes slightly further by recommending specific expansions (venue, ticket_classes) suited to this endpoint, adding tool-specific value beyond the schema's generic example. Still no elaboration on event_id format beyond the schema.

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 (Fetch) and resource (one event), and enumerates the concrete fields returned (name, summary, start/end, status, capacity, venue_id, listing settings). The phrase 'one event' implicitly distinguishes it from eventbrite_list_events, so an agent can tell what this does without opening the schema.

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?

Provides one invocation hint ('Use expand=venue,ticket_classes for more') but no explicit when-to-use guidance versus siblings like eventbrite_get_event_description or eventbrite_get_capacity. Contextual usage for fetching a single event is 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.