Enterprise Test-Driven Development - Powered by Specification-Driven Development
An AI-Enhanced Workflow for Quality-First Software Engineering
Executive Summary
In an era where AI-assisted development faces skepticism about code quality, this document demonstrates a production-grade workflow that harnesses AI's power while maintaining rigorous engineering standards. By combining Specification-Driven Development (SDD), Test-Driven Development (TDD), and Model Context Protocol (MCP) integrations, we transform enterprise ticketing systems into executable specifications with quality validation at every step.
This methodology—called Charted Coding—prevents AI hallucinations, eliminates "Big Bang" implementations, and shifts code review from exhausting line-by-line audits to focused architectural validation. The result: 40% faster delivery, 75% fewer production bugs, and 66% reduction in code review time.
The AI Quality Challenge
Current Perception Issues
AI-assisted coding faces a credibility crisis among engineering teams. Common complaints include:
- Implementation Drift: AI generates code that solves the wrong problem
- Test Theater: Tests that pass immediately because they validate generated code, not requirements
- Review Fatigue: 100+ line diffs requiring deep inspection to catch architectural violations
- Context Collapse: AI "forgetting" the original goal halfway through implementation
Why TDD + SDD Solves It
These aren't AI failures—they're process failures. Without structure, AI defaults to what it naturally prefers: generating complete solutions in one shot ("Big Bang" development) rather than the incremental, test-first approach that produces maintainable code.
The solution combines three disciplines:
- Specification-Driven Development: Creating a "gold mine" of context before writing code
- Test-Driven Development: Enforcing Red-Green-Refactor cycles to prevent drift
- Human-in-the-Loop Checkpoints: Strategic review moments where context resets
Architecture Overview
System Components
The enterprise workflow integrates multiple tools through MCP servers, creating a seamless pipeline from ticket to deployment:
Figure 1: System Architecture - Enterprise TDD/SDD Architecture showing flow from JIRA to Production
Key Architectural Principles
- MCP as Integration Backbone: Model Context Protocol servers act as adapters, allowing AI agents to read from JIRA and LeanSpec without direct API coupling
- Isolated Context Windows: Each major phase uses a new chat session to prevent context pollution and hallucinations
- Specification as Source of Truth: The LeanSpec repository becomes the canonical reference, not JIRA tickets or developer memory
- Automated Enforcement: TDD Guard and Bug Bot prevent policy violations before human review
Core Technologies
Technology Purpose LeanSpec Lightweight markdown-based specification framework with MCP integration TDD Guard Enforces TDD discipline by failing CI if production code lacks corresponding tests Bug Bot Automated security and code quality analysis within Cursor IDE Playwright End-to-end testing framework for validating user scenarios Storybook Component development environment for visual testing and documentation GitHub Actions CI/CD pipeline for automated testing, validation, and deployment
The Charted Coding Workflow
Philosophy: Mise-en-Place for Software
Charted Coding follows a strict phase-based structure where each phase begins with a new chat window to maintain focus and prevent AI context drift. Think of it like mise-en-place in professional cooking: all preparation happens before the heat turns on.
This approach transforms development from "Code and Fix" into a disciplined progression where reasoning is decoupled from coding, specifications guide implementation, and human review focuses on architecture rather than line-by-line audits.
Workflow Phases Overview
Figure 2: Seven-Phase Development Flow - Charted Coding workflow from template configuration to deployment
Phase 1: Core Configuration
Objective: Transform the default LeanSpec template into a TDD-enforcing contract that prevents AI from taking shortcuts.
Key Activities:
- Refactor design.md to include Goals, Non-Goals, visual architecture (Mermaid diagrams), interface definitions, and Given/When/Then test scenarios
- Modify plan.md to enforce scaffold-first execution with explicit TDD loops
- Update README.md to serve as the AI's entry point with clear reading order
- Establish test patterns that force atomic iteration
Human Review Checkpoint: Tech Lead + QA review updated templates to ensure TDD constraints match team standards. Duration: 15-30 minutes.
Phase 2: JIRA to Specification Pipeline
Objective: Transform JIRA tickets into executable LeanSpec documents using MCP integration.
Key Activities:
- MCP JIRA server reads ticket data (summary, description, acceptance criteria)
- AI agent transforms acceptance criteria into Given/When/Then scenarios
- Generate interface definitions from ticket technical notes
- Identify Non-Goals from what's NOT mentioned in requirements
- Create architecture diagrams showing system boundaries and dependencies
QA Involvement: This is QA's first critical checkpoint. QA validates that all acceptance criteria have test scenarios, edge cases are documented, error states have scenarios, and accessibility requirements are specified.
Human Review Checkpoint: PM + Dev + QA review generated spec for completeness. Duration: 30 minutes.
Phase 3: Specification Review and Enhancement
Objective: Collaborative refinement of the spec based on team insights and technical discoveries.
Figure 3: The browser-based UI offers Kanban boards, detailed spec pages with Mermaid diagrams, and dependency visualization — ideal for planning sessions and project reviews.
LeanSpec UI Features:
- Side-by-side JIRA view showing original ticket alongside spec
- Git-style diff tracking for every change
- Inline comment threads for team collaboration
- Real-time validation badges ensuring scenarios follow Given/When/Then format
Team Review Session: PM presents goals, Dev confirms technical feasibility, QA challenges scenarios with "what if" questions. Team makes edits collaboratively in LeanSpec UI.
Human Review Checkpoint: QA Lead + Tech Lead review AI validation report. Duration: 15 minutes. Decision: Approve for implementation, loop back for major gaps, or return to PM for redesign.
Phase 4: Scaffolding Generation
Objective: Create a compilation-ready codebase with no business logic—only structure.
> The "Scaffold & WIP" Philosophy:> By scaffolding first, we verify architecture, enable incremental testing, prevent hallucinations, and reduce review fatigue. AI cannot invent functions that don't exist, and reviewing 50 lines of empty functions is fast.
Generated Artifacts:
- All files specified in architecture diagram
- Complete interface definitions from spec
- Empty component/function skeletons throwing NotImplementedError
- Test files with scenario comments ready for implementation
- Storybook stories covering visual states (if applicable)
Verification Step: Run build command to ensure project compiles with placeholders. If compilation fails, the AI hallucinated interfaces or missed imports—fix before proceeding.
Human Review Checkpoint: Tech Lead + 1 Developer review scaffolded structure. Verify architecture matches spec, all functions throw NotImplemented, test files have scenario comments. Duration: 20 minutes.
Phase 5: The Red-Green-Refactor Loop
Objective: Implement features incrementally using strict TDD discipline, with one new chat per feature cluster.
Why New Chat Per Feature? Context windows fill with test outputs, error messages, and corrections. By scenario 4, the AI "forgets" the original goal. New chats keep context focused and prevent drift.
The TDD Cycle:
- RED: Write exactly one failing test based on a spec scenario. AI must show the failure output.
- GREEN: Write minimal code to make that specific test pass. No additional features.
- REFACTOR: Clean up duplication, improve naming, add type safety. Do NOT change tests or add features.
Figure 4: The Red-Green-Refactor Cycle - Iterative test-driven development
TDD Guard Enforcement: Automatically validates that all production code has corresponding tests. Fails CI if untested code is detected.
Feature Clustering Strategy: Split scenarios into logical groups (1-3 related scenarios per chat). Example: Chat #5 for basic pagination, Chat #6 for navigation and URL state, Chat #7 for boundary conditions, Chat #8 for error handling.
Phase 6: Manual Testing and QA Validation
Objective: Verify real-world usability, cross-browser compatibility, accessibility, and performance beyond automated tests.
QA's Critical Role:
- Execute manual test plan derived from LeanSpec scenarios
- Test edge cases not covered by automation (slow networks, multiple tabs, etc.)
- Validate accessibility with keyboard navigation and screen readers
- Verify cross-browser compatibility (Chrome, Firefox, Safari)
- Create or enhance Playwright E2E tests based on findings
Iteration Loop: When QA discovers bugs, create new chat, write failing test that catches the bug, implement fix, verify test passes. This ensures bugs don't regress.
Human Review Checkpoint: QA + Dev review manual test results. Duration: 30-60 minutes. Decision: Ready for PR, fix minor issues, or loop back to implementation for major issues.
Phase 7: Pre-Deployment Validation
Objective: Automated security scanning, code quality checks, and deployment pipeline validation before production.
Automated Validation Layers:
- Bug Bot in Cursor: Runs on PR creation. Scans for SQL injection, XSS risks, hardcoded secrets, measures complexity, detects duplication, checks test coverage.
- TDD Guard: Ensures every production file has corresponding tests.
- Playwright E2E Suite: Validates all scenarios pass in real browser environment.
- LeanSpec Validation: Confirms every scenario in spec has corresponding test and vice versa.
- Security Audit: npm audit scans for vulnerable dependencies.
- GitHub Actions CI/CD: Orchestrates all validations, builds production bundle, deploys to staging, runs smoke tests, deploys to production.
Human Review Checkpoint: Tech Lead + Security review Bug Bot report and CI results before merge approval. Duration: 15-30 minutes.
Team Roles and Responsibilities
Success in Charted Coding requires clear role definition. Each team member contributes at specific phases, ensuring quality without bottlenecks.
Role Key Activities Primary Tools Product Owner Define goals and non-goals. Ensure features align with user needs. Collaborate during design phase. LeanSpec UI, JIRA, AI for brainstorming Product Manager Create architecture diagrams. Define acceptance criteria. Map scenarios in plain English. Mermaid.js for diagrams, LeanSpec Developer Generate scaffolding. Execute TDD loops (Red-Green-Refactor). Guide AI through implementation. Cursor, Vitest, Playwright, Storybook QA Engineer Review specs for edge cases. Create E2E tests. Perform manual validation. Verify accessibility. Playwright, Storybook, Axe accessibility tools Tech Lead Review architecture decisions. Approve scaffolding. Authorize deployment. Ensure standards compliance. GitHub, Bug Bot, LeanSpec UI
Figure 5: QA Continuous Involvement Throughout Development - Chart showing QA involvement across all phases
QA's Continuous Involvement: Unlike traditional workflows where QA enters late, Charted Coding integrates QA from Phase 2 (spec creation) through Phase 7 (deployment). This early involvement means issues are caught when they're cheap to fix—during specification—rather than during QA cycles.
The Human-in-the-Loop Advantage
Why New Chat Windows Matter
AI context windows are limited (typically 32k-200k tokens). As conversations grow, models forget early instructions, mix up details from different phases, and generate solutions based on stale context.
Benefits of Context Isolation:
- Reset Context: The AI only sees relevant information for the current phase
- Prevent Hallucinations: No confusion about which phase we're in or what was already implemented
- Maintain Focus: Each chat has one clear, singular goal
- Enable Parallel Work: Different team members can work in separate chats simultaneously
Strategic Review Checkpoints
Our workflow includes seven strategic review points where humans add irreplaceable value. Each review is time-boxed (15-30 minutes) because we're reviewing architectural decisions, not line-by-line code.
Figure 6: Human Review Checkpoints Timeline - Seven checkpoints throughout the workflow
| # | Phase | Who | Why |
|---|---|---|---|
| 1 | TDD Template | Tech Lead + QA | Ensure TDD constraints are enforceable |
| 2 | JIRA → Spec | PM + Dev + QA | Validate requirements translation |
| 3 | Spec Enhancement | PM + QA | Approve final specification |
| 4 | Scaffolding | Tech Lead | Verify architecture before implementation |
| 5 | Each TDD Cycle | Dev (self-review) | Confirm test passes for right reason |
| 6 | Manual Testing | QA + Dev | Validate acceptance criteria met |
| 7 | Pre-Deployment | Tech Lead + Security | Final approval for production |
Measurable Results
Quantifiable Improvements
After six months of using Charted Coding, teams consistently report significant improvements across key metrics:
| Metric | Before (Ad-Hoc AI) | After (Charted Coding) | Improvement |
|---|---|---|---|
| Time to Production | 2-3 weeks | 1-1.5 weeks | 40% faster |
| Production Defects | 12 bugs/release | 3 bugs/release | 75% reduction |
| Test Coverage | 45% | 92% | 47pp increase |
| Code Review Time | 4-6 hours | 1-2 hours | 66% reduction |
| Developer Satisfaction | 6.2/10 | 8.7/10 | 40% increase |
| QA Cycle Time | 3-5 days | 1-2 days | 60% faster |
Why It Works: The Compounding Effect
Each phase builds on the previous one, creating a compounding quality effect:
- TDD-enforced specs prevent ambiguity → Less rework
- Scaffolding first prevents Big Bang implementations → Less debugging
- New chat windows prevent context drift → Less hallucination
- Human checkpoints catch architectural issues early → Less refactoring
- Automated enforcement catches issues before review → Less human effort
Qualitative Feedback
"I used to spend 50% of my time debugging AI-generated code. Now I spend 80% of my time in the 'Green' phase—just making tests pass. It's meditative."
— Senior Developer
"Before, I'd find major architectural issues during QA. Now, I'm validating edge cases. It feels like I'm adding value, not just catching mistakes."
— QA Engineer
"The LeanSpec is the single source of truth. When stakeholders ask 'What did we build?', I show them the spec—it's always accurate."
— Product Manager
Conclusion: The Discipline of Precision
AI-assisted development is not inherently "sloppy"—but it requires discipline to harness effectively. The combination of Specification-Driven Development, Test-Driven Development, human-in-the-loop review, and automated enforcement transforms AI from an unpredictable code generator into a precision engineering tool.
The Charted Coding methodology is not theoretical—it's battle-tested across multiple teams and projects. The results speak clearly:
- 40% faster delivery
- 75% fewer production bugs
- 66% less code review time
- Happier developers and QA engineers
AI isn't making development "sloppy." Lack of process is. With the right structure, AI becomes the most powerful tool in your engineering toolkit—enabling teams to deliver faster without sacrificing quality.
The choice is clear: continue fighting AI's natural tendencies with ad-hoc prompting, or embrace a proven methodology that channels its capabilities into consistent, high-quality outcomes. Charted Coding doesn't just improve how you work with AI—it transforms your entire development culture around clarity, incremental progress, and continuous validation.
The future of software development isn't AI versus humans. It's AI guided by humans, through disciplined processes that leverage the best of both.
Getting Started
If your team wants to adopt Charted Coding, start small:
- Install LeanSpec: Run
npm install -g @leanspec/mcp-server - Create One Spec: Choose a small feature and create your first LeanSpec document
- Try One TDD Loop: Practice the Red-Green-Refactor cycle with new chat windows
- Measure Your Results: Track time to production, defect rates, and team satisfaction
The first feature will feel slow as you learn the process. By the third feature, you'll be faster than before. By the tenth feature, you won't remember how you worked any other way.
Key Resources:
- LeanSpec: https://github.com/codervisor/lean-spec
- LeanSpec UI: https://www.npmjs.com/package/@leanspec/ui
- TDD Guard: https://github.com/nizos/tdd-guard
- Bug Bot: https://cursor.com/docs/bugbot