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Context Engineering — Chapter-28: Where to start
- Source: /library/Context Engineering/source-file.pdf
- PDF pages: 255–256
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Where to start Part III is over, and it handed you more techniques than any week can hold. If you try to adopt all of it at once, you will end up with half a dozen new files nobody maintains, which is the fate of every discipline adopted on enthusiasm alone. The right order of adoption is the one the whole book has been following all along: start with what pays off without infrastructure, and climb a step only when a pain point of your own, measured in your own work, calls for the next one. The ladder has three steps, and here the list is the argument: This week: a short spec per task (chapter 8), a lean persistent context file (chapter 12), the minimal packet assembled one decision at a time (chapter 17) and the state note at the end of every session (chapter 18). None of these requires a tool, an approved budget or anybody’s permission: they are text-file habits, and they are what produce the first visible difference in your Thursdays. This month: the living doc with an owner and a check (chapter 9), the first architecture decision record (ADR) in chapter 10, validating what the AI asserts as a step in your workflow (chapter 19) and a simple count of your own turns (chapter 26). This is the step that turns a personal habit into a repository asset. Once the pain is proven: retrieval with an index (chapter 22), tools exposed to the model (chapter 23), subagents in parallel (chapter 21). Each of those carries a permanent maintenance cost, and the matching chapters say which pain point justifies
it: a codebase that does not fit even after trimming, a value that changes faster than the session, a divisible task with a disjoint diff. The top step is never a prize for maturity, and that is what the word “proven” is doing on the ladder. Climbing without the matching pain point installs exactly what chapter 22 called an orphan index and chapter 23 called a bloated catalog: fixed cost with no question to pay for it. If you are torn between climbing and waiting, wait while counting: the metric from chapter 26 exists for that decision, and it costs thirty seconds per turn.