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Reference explainers, not news: what project context is, how context engineering and harness engineering fit together, how git-native context differs from flat instruction files and vector memory, and what belongs in each document type.
- AI Agent Memory vs Project Context
Agent memory records what happened in your sessions. Project context records what the project has decided. Where the line falls and which one you actually need.
- Context Engineering vs Prompt Engineering
Compare prompt engineering and context engineering for coding agents: task instructions, context delivery, and a worked example of using both.
- What Is Harness Engineering?
Harness engineering designs the tools, guidance, and checks around an AI coding agent. See how it relates to context engineering and what your team controls.
- Spec-Driven Development vs Context Engineering
Spec-driven development defines intent. Context engineering supplies the understanding needed to execute it. Why a spec is one part of context, not the whole.
- What Is Repo Memory?
Repo memory is project context: decisions, rules, specs, and plans versioned in your repository, readable by any AI coding agent. What it is and how it works.
For dated guides, migrations, and vendor changes, see the blog. To put any of this to work, start with the plugin or the CLI.
Start with Archcore.
Keep your project decisions ready for the next task.