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

Annotations already declare readOnlyHint=true, openWorldHint=true and destructiveHint=false, so the safety profile is covered. The description adds only the raw REST path, which restates the resource hierarchy already present in the parameter names; it says nothing about 404 behavior for a missing sub-event, returned data shape, or how organizer scoping affects resolution.

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 short, front-loaded fragments with no filler; the resource identity comes first. The trailing endpoint path is marginally redundant with the schema but is compact and does hint at GET semantics.

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?

This is a simple single-resource read with 100% schema coverage and annotations covering the safety profile, so the description carries little burden. The main residual gap is that no output schema exists and the description does not characterize what a sub-event record contains (dates, prices, quotas), though the tool name makes the return obvious enough.

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 all three parameters (event, organizer, subevent_id) are already documented in the schema, including that organizer is optional for single-organizer tokens. The REST path in the description loosely mirrors the parameters but adds no syntax or format meaning beyond them, so the baseline of 3 applies.

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?

The description identifies the resource as "one date (sub-event) of an event series," which distinguishes it from siblings like pretix_get_event and pretix_list_subevents. However, it is a bare noun phrase with no verb (retrieve/fetch), so the action must be inferred from the title 'Get event series date'.

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?

There is no statement of when to use this tool versus pretix_list_subevents or pretix_get_event, and no mention of prerequisites or the case where the sub-event id is unknown. The only routing signal is implied by the resource being singular.

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