check_in

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

With no annotations, the description carries the full burden, and it does disclose two useful traits: this is a write operation and it requires CUQU_API_KEY. It still omits whether redemptions are idempotent, what happens on duplicate/invalid codes, and whether the action is reversible.

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 tight sentence with the operation and auth requirement front-loaded. It is efficient, though the brevity is partly under-specification rather than discipline.

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 mutation tool with no annotations, no output schema, and 0% parameter documentation, the description leaves too much unstated: what the return value is, error/duplicate handling, and the meaning of the code parameter. It is insufficient for correct invocation.

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 0% and the description offers no explanation of either parameter. It never clarifies that code is the check-in voucher/credential and activity_id identifies which event it belongs to, nor why code is optional when activity_id is required.

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 action (on-site event check-in/redemption) with the write nature flagged, which is more than a tautology. However, it doesn't differentiate itself from siblings like register_event or get_activity_card, so an agent must infer that this is the redemption/verification step rather than registration.

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?

No indication of when to use this tool versus register_event or query_activities, and no preconditions beyond the API-key requirement. The agent gets no routing guidance.

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