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Christopher Hoeben
Christopher Hoeben

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From Vibe Coding to Production: How to Build a Traceable PRD-to-Prompt Workflow for Shipping Maintainable AI Code

#vibecoding #aisoftwaredevelopment #prd #promptengineering

From Vibe Coding to Production: How to Build a Traceable PRD-to-Prompt Workflow for Shipping Maintainable AI Code

A concrete, repeatable workflow that closes the gap between AI-generated prototypes and production deployment by linking Product Requirement Documents directly to agent prompts and enforcing quality gates.

Start with a Plan: Generate the PRD Before the First Prompt

Vibe coding with tools like Claude Code and Cursor has moved from novelty to legitimate development approach since 2024, yet most workflows stop at the prototype stage because they lack a plan. Rule #5 for shipping maintainable AI code is to start with a plan. That plan must be a Product Requirement Document generated before you write a single line of code.

In comparative testing across ChatGPT, Gemini, Grok, and ChatPRD, Claude produced the strongest baseline for product work. Use it to draft the PRD by first defining the what and the how—scope, user stories, acceptance criteria, and technical constraints—before any code generation begins. A common approach is to prime the model with a system prompt that constrains output to a standard template:

Context
User Stories
Acceptance Criteria
Technical Constraints
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Once you have a draft, prompt the LLM to review it for breadth and clarity so the document can serve as context for the AI-assisted coding workflow. A review prompt might look like this:

Review this PRD for breadth and clarity. Identify gaps in user flows, edge cases, or missing technical constraints. Suggest concrete improvements.
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This review step prevents the shallow, unfocused output that often derails vibe-coded projects. With a validated PRD in place, every subsequent prompt has a single source of truth. The generated code becomes traceable back to a specific requirement rather than an improvised guess, which is essential when you need to refactor or debug agent-written logic.

Structure the PRD as Machine-Readable Context

Once stakeholders approve the PRD, freeze the scope into a top-level context document that the agent references across sessions. A common approach is to store it as CONTEXT.md in the repository root, separating immutable requirements from implementation notes so the agent does not drift when refactoring prototypes into production code. Treat the document as context for AI-assisted coding workflows rather than a static export.

Keep the file scannable: open with a constraints block that lists non-negotiables such as the TypeScript strict-mode check, followed by acceptance criteria written as checkable statements. The production workflow requires passing the type checker before deployment:

npx tsc --noEmit
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Follow this with runtime requirements and acceptance criteria in a single file:

<!-- CONTEXT.md -->
**Constraints**
- Strict TypeScript: npx tsc --noEmit must pass
- Runtime: Node.js

**Acceptance Criteria**
- [ ] OAuth login returns valid JWT
- [ ] API rate limiting enforced per user
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When starting a new agent session, point the tool to this file first. A common workflow is to include the context path in the initial prompt so the model grounds every subsequent edit in the original plan. If the requirements change, update CONTEXT.md and version it with the code; never maintain two sources of truth. This living reference keeps the original requirements active as the codebase evolves beyond the prototype stage, ensuring that every generated patch remains aligned with the agreed scope rather than silently introducing assumptions about behavior or architecture.

Decompose PRD Sections with the 1-3-1 Technique

Oversized prompts dump hundreds of lines of unmaintainable bulk into a single file. The 1-3-1 Technique forces you to fragment every PRD section into discrete agent prompts: one high-level goal, three implementation steps, and one validation criterion. This constraint prevents context overflow and keeps generated modules small enough to review in a single pull request.

For example, if a PRD section covers user authentication, the chain becomes a sequence of focused prompts. The first prompt establishes the goal:

Goal: Implement JWT-based login for the auth module defined in PRD §3.2.
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The next three prompts handle implementation steps:

Step 1: Create the /login POST route that accepts email and password, hashes the password with bcrypt, and returns a signed JWT.
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Step 2: Build the middleware that verifies the JWT from the Authorization header and attaches the user object to the request.
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Step 3: Write a logout helper that blacklists the token in Redis with a TTL matching the token expiry.
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The final prompt defines validation:

Validation: Run the login route tests and confirm that invalid credentials return HTTP 401 and valid credentials return HTTP 200 with a Set-Cookie header.
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Teams changing 15,000 lines per week with AI stay production-ready because every agent follows the same fragmentation rules. Map each prompt chain to a specific PRD section—§3.2 in the example above—so every generated file remains traceable to its origin. When a test fails or a requirement changes, you know exactly which prompt produced the code and which PRD paragraph to update. Store the PRD reference in a comment at the top of each generated file to preserve the link:

// Generated from prompt chain PRD-§3.2-auth-login
// Do not edit without updating PRD §3.2
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Enforce DRY and TDD as Mandatory Quality Gates

Vibe-coded output frequently passes local compilation only to stall in the repository, untested and unshipped. The distance between works on my machine and runs in production is exactly where these projects collapse. To close that gap, institute two mandatory quality gates before any commit reaches the branch: a DRY review and TDD validation.

Start with a type-check gate. Run the following against the main branch and block the agent if it fails:

npx tsc --noEmit
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This prevents TypeScript regressions from entering the prompt chain.

Next, enforce DRY. Instruct the agent to scan existing modules for duplicate logic, utility patterns, or API wrappers. If the newly generated code repeats an established abstraction, reject the output and rewind the prompt chain rather than allowing redundancy to accumulate.

Then require TDD. Every changeset must include tests mapped directly to PRD acceptance criteria. A common approach is to run the test suite and fail the gate if the new feature lacks tests:

npm test
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If the code lacks tests tied to the PRD or duplicates existing patterns, do not merge. Rewind the prompt chain and regenerate until both gates pass. Treat these checks as non-negotiable infrastructure, not optional suggestions, so the codebase remains maintainable as AI-generated volume scales.

Close the Loop with Continuous Review

Stop treating generation as a one-shot event. Rule #4 is a continuous learning loop. After deployment, compare the shipped implementation against the originating PRD sections to identify deviations, refactors, or emergent architectural decisions the agent introduced during generation. Update the living context document with these decisions so the next prompt cycle does not repeat stale assumptions. Capture the delta in a running review file that lives next to the PRD so future prompts ingest the corrected state.

A common approach is to require traceability comments in merged branches that link commits back to the originating PRD section and prompt iteration. When reviewing a diff, run a targeted check between the PRD scope and the actual files shipped:

git diff main...feature/auth-refactor --name-only | xargs grep -n "TODO\|HACK\|AI-" >> review_delta.md
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This exposes agent-generated shortcuts that diverged from the planned contract. For persistent traceability, append architectural decisions directly to the context document in a structured block:

ADR-007: Agent-Selected Retry Policy
- **PRD Section**: 3.2 Fault Tolerance
- **Commit**: `a1b2c3d`
- **Decision**: Switched from fixed interval to exponential backoff after rate-limit errors during generation.
- **Prompt Iteration**: v4
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Before closing the ticket, run the TypeScript compiler without emit to verify the changed surface:

npx tsc --noEmit
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This preserves maintainability when the original human context is no longer available. Teams that change 15,000 lines per week with AI stay production-ready because every agent follows the same rules and leaves breadcrumbs between the PRD, the prompt, and the final commit.

References for further reading

Sources consulted while researching this guide, included so you can verify the details and go deeper. Listing them is not a claim that every line was independently fact-checked.

I packaged the setup above into a ready-to-use kit — **Spec-to-Ship: The Vibe Coder's Build Kit (16 Items)* — for anyone who'd rather copy-paste than wire it from scratch: https://unfairhq.gumroad.com/l/euyyyi.*

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