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

readOnlyHint=true already tells the agent this is a safe read. The description adds real value by explaining the expand semantics (extra payload when requested) and mapping to the REST path, but it does not cover auth requirements, error behavior for missing/invalid order IDs, or pagination (not applicable here).

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?

Three tight sentences, front-loaded with the core action and then the expand guidance. The trailing endpoint reference is arguably redundant given the tool name, but it is short and adds a REST 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?

For a simple read-only lookup with fully covered parameters and no output schema, the description supplies the essential expand behavior and the identity of the resource. Only the absence of error/permission context keeps it from being fully complete.

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%, setting a baseline of 3, and the description goes further by naming specific expand values (attendees,event) and describing their effect — values the schema example (venue,organizer,ticket_classes) does not mention. This meaningfully enriches the expand parameter beyond structured data.

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 singular resource (one order) plus the underlying endpoint, so an agent can distinguish it from eventbrite_list_orders. It does not explicitly name the sibling it complements, so it stops short of a 5.

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?

Gives one concrete usage cue — pass expand=attendees,event to include tickets and event — but says nothing about when to prefer this over eventbrite_list_orders or eventbrite_get_attendee, and lists no preconditions or failure modes.

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