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

Annotations already declare readOnly/idempotent/non-destructive/open-world, so safety is covered. The description adds genuinely useful context beyond that: the token-scoped visibility boundary, an explicit exclusion ('notification e-mail addresses are never returned'), and the transport detail (POST /events/list) which is unusual for a read and worth flagging.

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 short sentences, front-loaded with the resource and scope, no filler. The telegraphic field list ('id, dates and the top-level settings') is dense but readable; nothing is redundant with the schema.

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?

There is no output schema, so the description correctly carries the return-shape burden and even discloses an excluded field. Pagination is covered by the schema, so the only remaining gap is that it does not characterize result size or ordering.

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 baseline is 3. The description does add a small amount of meaning for include_details by enumerating packages/questions/promo codes, but it says nothing about limit/offset behavior beyond what the schema and its next_offset hint already provide.

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 the resource (events, explicitly ticketed/auction events), the scope (forms the token covers), and the shape of what comes back (id, dates, top-level settings). The mention of top-level vs nested settings implicitly separates it from the get_* siblings that fetch a single registration/transaction.

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?

It gives one concrete usage cue ('Set include_details for packages, questions and promo codes'), which tells the agent when to expand the payload. But it never says when to prefer this tool over list_registrations_by_date or get_registration, so routing among siblings 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.