---
id: M07-L05
title: "Challenge: resume without the old chat"
module: M07
chapters: "15–16"
checkpoint: "CP08"
---

# M07-L05 — Challenge: resume without the old chat

Resume a small engineering task using repository context alone. Use a fresh CP08 copy, which deliberately lacks the negative-infinity extension you may have tried in Chapter 15. The deliverable is a meaningful added assertion, actual verification, and a revised handoff.

Read the task in `docs/handoff.md`, then start a new agent session in the project root. Ask it to complete that handoff without pasting the solution or command sequence. Preserve the exact prompt. A continued conversation can carry hidden context and weaken this discovery test.

The required case proves that negative infinity produces FAULT/nonfinite with no current temperature. The existing code already promises this behavior. Use an independent monitor or ordered injected timestamps so the case does not accidentally depend on previous recovery state. Do not implement capstone features in CP08.

Observe actual context inspection, bounded edits, command use, and result interpretation. The agent's plan to test is not a command result. Independently inspect the assertion and compare its expectations with the nonfinite-input requirement. Then inspect the actual output from the available test wrapper.

If the handoff claims prior checks passed without accessible receipts, find those records or mark the claim unestablished. A new independent check can establish the present artifact; it does not recreate an earlier unrecorded run. Preserve the distinction in the evidence note.

Update the handoff with current source identity, completed test change, relevant results, remaining limitations, and one next task. The capstone can now be named as future work. The challenge passes on actual behavior and evidence, not on the length of the final summary or a completion button.

## Resources and completion

Read Chapter 15–16 and the matching Sensor Monitor checkpoint README, requirements, and evidence notes. Project paths are relative to its root. Figures: SS16-04, SS15-05. Attempt the [exercise](exercise.md), preserve actual results, then use the separate instructor answer key. 

Source resources: [Chapter 15](../../../../book/chapters/ch15/chapter.md); [Chapter 16](../../../../book/chapters/ch16/chapter.md); [checkpoint and recovery map](../../../../examples/sensor-monitor/docs/checkpoints.md). Use the README and requirements inside your named checkpoint; the repository's final CP09 files include features absent from earlier stages.