Why This Matters

This capstone applies PR-01 to PR-05 into one deliverable: a complete internal Copilot platform design ready for leadership review.

Concept Explained

Design covers: architecture, surfaces, ownership, cost/latency budgets, model orchestration, governance, rollout plan.

How It Works

Write a design doc covering: problem, proposed architecture, surfaces, owners, budgets, orchestration, governance, rollout phases, success metrics. Present to leadership.

Step-by-Step Tutorial

1. Write problem statement

2. Propose architecture

3. Set budgets

4. Plan orchestration

5. Plan governance

6. Rollout phases

7. Success metrics

8. Present

Real-World Example

A platform team designed an internal Copilot platform. Got leadership buy-in. Rolled out in 3 phases: inline+Chat (month 1), CLI+agent (month 3), Extensions+governance (month 6). After 1 year: 95% adoption, 4 hours/dev/week saved, $40/dev/month cost.

Example Prompts / Commands / Code

# Internal Copilot Platform Design

## Problem
Devs spend X hours/week on tasks Copilot can accelerate.

## Proposed Architecture
- Surfaces: Inline, Chat, CLI, Agent, Spaces
- Ownership: DevEx owns platform; per-surface owners
- Data flow: [diagram from PR-02]

## Budgets
- $40/dev/month (Pro+ seats + top-ups)
- Latency SLOs: inline <500ms, chat <5s, agent <10min

## Orchestration
- Route by task type (PR-05)
- Fallback matrix

## Governance
- Business plan (no training)
- DLP via pre-commit hooks
- Audit via Metrics API

## Rollout
- Phase 1 (Month 1): inline + Chat
- Phase 2 (Month 3): CLI + coding agent
- Phase 3 (Month 6): Extensions + governance

## Success Metrics
- Adoption: >80% of devs using Copilot daily
- Time saved: 4+ hours/dev/week
- Defect rate: not increased
- Cost: within budget

Common Mistakes

• No problem statement — solution looking for a problem.
• No budgets — costs spiral.
• No rollout phases — big bang fails.
• No success metrics — can't prove ROI.

Best Practices

• Start with problem statement.
• Propose architecture with budgets.
• Plan phased rollout (3 phases over 6 months).
• Define success metrics upfront.
• Present to leadership for buy-in.

Troubleshooting

Practical Exercise

Professional Challenge

Frequently Asked Questions

Further Reading

• Copilot for business

Official References

• Copilot for business

Related lessons: PR-01, PR-05