Specify context
Language + version. Framework (React 18, FastAPI). Style guide (Google, PEP-8). Testing library. Import conventions.
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Type hints + tests as spec
Show function signature + test cases. Model writes to spec. Beats prose description.
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Execution feedback
Run generated code + tests. On failure: feed error + traceback back. Model corrects. Standard in Copilot Chat + Cursor.
Multi-file understanding
Include relevant files in context. Full file for edits, snippets for imports. Modern IDE integrations select automatically.