/diagnose-yonsei-course-access

name: diagnose-yonsei-course-access
description: Resolve and probe official Yonsei course-catalogue and undergraduate or graduate registration entry points without credentials or mutations. Use when diagnosing ysweb.yonsei.ac.kr or underwood1.yonsei.ac.kr reachability, stale requestTimeStr links, redirects, authentication boundaries, or unproven VPN assumptions.

Diagnose Yonsei Course Access

Return one access diagnosis. Distinguish the year-round authenticated Underwood handbook from period-limited registration entry points.

Workflow

1. For course discovery, follow `$connect-yonsei-session` and try Underwood `수업 → 수강편람 → 조회` first. Report `catalog_available` only after the result grid returns course rows. 2. For an undergraduate or graduate registration failure, diagnose that entry separately. A closed registration window does not imply that the handbook is unavailable. 3. For unauthenticated connectivity diagnosis, resolve and probe the stable entry; never persist a copied `requestTimeStr` value:

   python3 "$SKILL_DIR/scripts/yonsei_service.py" list
   python3 "$SKILL_DIR/scripts/yonsei_service.py" probe course-catalog --json

4. Report the HTTP classification, effective Yonsei host, and whether direct connectivity was established. 5. State separately whether authentication, handbook row access, registration period, or a VPN requirement remains unverified.

The unauthenticated probe proves only that an official UI shell is reachable. The authenticated Underwood command is the course-row path; it is not a public course API.

Boundaries

• Never claim that a successful probe fetched course rows or seat counts.
• Never ask the student to capture the handbook before trying its authenticated

direct query.

• Never request a Yonsei password or OTP.
• Diagnose authenticated network failure before considering any VPN requirement; do not launch a VPN client.
• Never submit, cancel, waitlist, poll, or modify a registration.