Tracer Bullets
Build one thin vertical slice through all system layers before widening. Tracer bullets are production code — not prototypes, not spikes. They validate architecture through real integration, then become the foundation for remaining work.
AI agents are especially prone to building horizontal layers in isolation, discovering integration failures only after committing to an unproven architecture.
When to Use
- Solution is NOT a well-trodden path — no established docs, tutori
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