# Getting Started with Devin — Acme Engineering Team

## 1. Starting a Session
| Method | When to use | Example |
|--------|-------------|--------|
| **Slack** — message @Devin | Quick, scoped tasks | "Fix the failing CI in api-service" |
| **Web app** — app.devin.ai | Longer tasks needing file attachments or playbooks | Attach a migration playbook + spec file |

## 2. Writing Effective Prompts
Devin works best with specific, scoped requests. Always include
the file path, what's broken, and when it started.

❌ "Fix the login bug"
✅ "The login form at src/pages/Login.tsx returns a 401 for valid
   credentials since the JWT key rotation on Friday. Check the
   auth middleware at src/middleware/auth.ts."

## 3. Linear Integration
Go to Settings > Connections > Linear and authorize. Once
connected, Devin can:
- Pick up tickets assigned to it automatically
- Update ticket status as it works
- Link PRs to the originating Linear ticket

See the full setup guide: docs.devin.ai/integrations/linear

## 4. Playbooks for Recurring Tasks
Create reusable prompts at Settings > Playbooks > Create New.
For our Express-to-Fastify migration, the playbook should include:
- The target module path (e.g., src/services/payments/)
- Test commands: npm run test:api && npm run test:integration
- Rollback steps if the migration breaks downstream consumers

## 5. Knowledge — Teaching Devin Our Conventions
Add team conventions at Settings > Knowledge > Create knowledge.

Example entry:
  Trigger: "working on API routes"
  Content: "We use Fastify, not Express. All routes live in
  src/routes/. Run npm run test:api before committing.
  Error responses must use the ApiError class from src/lib/errors.ts."