Runnable Python AI Agent Chapter Checkpoints

Updated: 2026-09-09 · Status: DRAFT

Run from the complete repository root using the frozen environment. These demonstrations accompany the manuscript. The ownership guide distinguishes learner-built definitions from supplied runtime behavior. New Chapters 4, 7 and 13 have construction briefs, not completed checkpoints.

Chapter	Manuscript	Checkpoint
1	Make the first model call for Lucy	ch01.py
2	Give the agent reliable shop tools	ch02.py
3	Build the model and tool loop	ch03.py
4	Build durable state with SQLite	PLANNED — no executable checkpoint
5	Remember across conversations	ch05.py
6	Reuse a tested opening procedure	ch06.py
7	Build a durable work inbox and report outbox	PLANNED — no executable checkpoint
8	Talk to the agent from your phone	ch08.py
9	Wake up for schedules and stock events	ch09.py
10	Ask permission before spending	ch10.py
11	Survive the ambiguous supplier order	ch11.py
12	Recover work after a process crash	ch12.py
13	Connect an external tool with MCP	PLANNED — no executable checkpoint
14	Isolate tools and untrusted content	ch14.py
15	Measure whether the agent helps	ch15.py
16	Improve behavior with evaluated changes	ch16.py
17	Delegate one bounded task	ch17.py
18	Deploy and maintain the agent	ch18.py
19	Lucy leaves the shop for a day	ch19.py

The final accelerated day retains two databases, a readable report and JSON evidence:

bash

uv run --python 3.14 python book/textbook/checkpoints/profrod_sovereign_agent_ch19_integrated_shop_day_checkpoint.py --output /tmp/lucy-day-first-run

Use a fresh output path for each retained run; the checkpoint refuses to overwrite it. The independently authored fixture expects two accepted orders totaling 2600 pence. Vanilla ends with eight physical tubs after one receiving event; strawberry has one physical tub and four pending; chocolate stays at twelve. These are fixture expectations, not a business forecast. Its Telegram and model exchanges are simulated. A successful day does not establish a live handset exchange or long-running uptime.

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