Backups without GitHub

Chamber 1, Ariadne's thread. The way back, tied before you go in.

Ariadne gave Theseus a ball of thread to tie at the labyrinth's door, so there was always one sure way out. Before Copilot changes anything in your folder, you tie the same thread: a snapshot you can always walk back to.

Time: About 40 min
Python: Standard library
To clear: 18 of 25 points
Gold thread: All 30 points

And 2 steps must pass in full, whatever the score: "Ticket 1: leave the data alone" and "Ticket 2: check first, save first". They are the skills this chamber exists to prove.

Your scenario

A morning reconciliation folder: recon.py checks the internal book against the custodian's file. Same skill and same points in every scenario; your choice is remembered for the whole course.

Your answers are saved in this browser as you go, so you can close the tab and come back.

What you will do

1What the thread is made ofLearn
2The edit that came with no way backBe the tool layer · 12 points
3What the fingerprints sawPredict, then run · 4 points
4Ticket 1: leave the data aloneFix the code · 4 points · must pass in full
5Ticket 2: check first, save firstFix the code · 5 points · must pass in full
6Harder variant: what changed since the snapshotWrite the code · 5 points · optional
7What you carry out of this chamberWork context

What clearing it proves

Take a fingerprinted snapshot before every change, and restore any of them without losing data or the work done since.

snapshots
sha256 fingerprints
safe restore
local git
session rules

You leave with thread.py and protocol.txt, handed over once the server has graded your pass.

Part of Agent-Style Workflows with Copilot. Grading is deterministic and runs on the server.