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SitePoint17 min readtutorialintermediate

Spec-Driven Development: Enforcing Architectural Contracts for Coding Agents

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Summary

Spec‑driven development encodes architectural rules as machine‑readable Zod schemas, letting automated agents (e.g., Copilot, Claude Code) be checked for boundary violations, API drift, and runtime invariants via AST analysis and CI tests.

  • Autonomous coding agents can introduce 10‑50 architectural violations per session, far outpacing human error rates.
  • Standard linters (ESLint, Biome) only catch syntactic issues; they lack holistic, schema‑driven enforcement of module boundaries.
  • Spec‑driven development treats architecture as a first‑class, versioned artifact, validated at three layers: structural (imports), type‑shape (public API), and behavioral (test invariants).
  • Implementation example uses TypeScript, Zod, and the TypeScript Compiler API to define contracts (allowedDependencies, forbiddenImports, publicExports) and validate agent‑generated files in CI or pre‑commit hooks.

As AI‑driven code generation scales, architectural drift becomes a hidden risk that can corrupt dependency graphs and break contracts before humans notice. Embedding enforceable contracts in the repo lets teams catch violations early, keeping large, agent‑augmented codebases maintainable and aligne…

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