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

Annotations already declare readOnlyHint=true, openWorldHint=true, and destructiveHint=false, so safety is covered. The description adds the returned-field inventory and confirms a REST GET mapping, but says nothing about auth requirements, rate limits, or not-found behavior.

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?

A single compact sentence with the resource and identifier front-loaded, followed by the returned-field scope and endpoint. It earns its place, though the trailing 'GET /events/{id}' is modestly redundant.

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 lists the return payload (description, organizer, reminder, recurring rule, RSVP settings/stats, custom data, share links), giving the agent a sense of what it gets back. Missing only edge-case behavior such as not-found handling.

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 the event_id parameter is already fully documented including its example and cross-reference. The description only echoes the 'evt-...' prefix format, adding no syntax or constraint detail 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/resource ('One event by id (evt-...)') and enumerates the fields returned, so the agent immediately knows this is the single-record fetch. It is clearly distinguishable from the sibling list_events, which returns multiple records.

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?

'One event by id' implies the single-record use case versus listing, and the schema points to addevent_list_events for discovery. However, there is no explicit statement of when to prefer this over list_events or what to do if the id is unknown; usage must be inferred from the name.

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