register_event

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

With no annotations, the description carries the full behavioral burden, but it does add two useful facts: this is a write operation and it requires CUQU_API_KEY. It says nothing about duplicate registrations, capacity limits, reversibility, or failure modes, which are the main risks for an enrollment write.

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 compact sentence with no waste, and the write/auth caveat is parenthetically attached to the action. Slightly terse given the gaps it leaves, but structurally sound.

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 2-parameter write tool with no annotations, no output schema, and 0% schema coverage, the description covers auth and the write nature but leaves parameter semantics and failure behavior unexplained. It is minimally viable rather than 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 description coverage is 0% and neither parameter is documented in the schema. The description implies activity_id (指定活动) but never explains what user_id is, whether it can be omitted for the authenticated user, or what format either ID takes.

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 names a specific verb (报名/register) and resource (活动/activity), and the user-for-activity relationship is clear enough to distinguish it from siblings like create_activity or query_activities. It stops short of explicitly naming an alternative, so it is clear but not fully differentiated.

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 alternatives such as create_activity, check_in, or query_activities. The intended context is only implied by the verb 报名.

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