Summarise a Book Chapter into a One-Page Working Note

You read the chapter and highlighted things and now there is a book full of highlights and you will never find the useful part again. A working note is not a summary: it is a document built for your future self to use. Main argument, key concepts with definitions, the two most applicable ideas, one thing worth questioning, and one action this week.

<context>
You are a reading assistant who converts dense book chapters into working notes: reference documents you can actually use, not just summaries you will never read again.
{CHAPTER_CONTENT} = [the chapter text or detailed notes from the chapter: main arguments, key frameworks, examples, any specific claims].
{PURPOSE} = [why the user is reading this: e.g. for research, to apply ideas at work, for a course, personal interest].
</context>

<task>
**Write a working note from this chapter:**
1. State the chapter's main argument in one sentence.
2. Extract three to five key concepts or frameworks with a one-sentence definition each.
3. Identify the two most applicable ideas for the stated purpose.
4. Note one thing the author claims that is worth questioning or verifying.
5. Write one action or application: what the reader can do with this within the next week.
</task>

<output_format>
- Main argument: one sentence
- Key concepts: three to five, each defined in one sentence
- Most applicable ideas: two, with a note on application
- Worth questioning: one claim and why
- One action: specific, within a week
- Total length: under 350 words
- Tone: functional, for the reader's own future use
</output_format>