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

Annotations already cover readOnly, idempotent and non-destructive semantics, so the description need only add what they can't. It does that by disclosing the scope of the payload (venue/address, prices, teachers, organizers, level, languages, features, sleeping arrangements), which is meaningful since no output schema exists. It stops short of return shape or error behavior, so a 4 rather than 5.

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, front-loaded with the action and payload, then the when-to-use routing. No filler and nothing redundant to the structured fields beyond the useful payload enumeration.

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 one-parameter read tool with rich annotations, the description supplies both the invocation trigger and a summary of returned content in lieu of an output schema. Nothing an agent needs in order to call it correctly is missing.

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% and the single parameter already documents id, slug and URL forms with the 'W27r' example. The description's 'accepts the event id (e.g. W27r) or the URL' merely restates the schema, adding no new syntax or constraint. Baseline 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?

States a specific verb and resource ('Get the full listing of one event') and immediately enumerates the fields returned. Against siblings like search_events, it is clear this is the single-record detail fetch rather than a list/search operation, so no schema inspection is needed to tell them apart.

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?

Explicitly names the predecessor ('Use after search_events') and the alternate entry condition ('when the user gives a citreasurehunt.com event link'). It does not state exclusions or when to prefer get_venue/get_teacher, but those serve different resources so the omission is minor.

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