roo-code-integration-guide

Step 3.5 Flash + Roo Code Integration Guide

Configure Step 3.5 Flash as the backend for Roo Code (VS Code extension) to enable a powerful, autonomous pair-programming experience.

1. Why Step 3.5 Flash + Roo Code?

• Deep Reasoning: Flash understands complex project structures and multi-step instructions.
• 256K Context: Process entire codebases for holistic refactoring.
• Speed: fast response times minimize waiting during iterative loops.

2. Prerequisites

1. API Key: Get yours from the StepFun Platform (or OpenRouter).
2. Extension: Install Roo Code from the VS Code Marketplace.

3. Configuration

Open Roo Code settings (Gear icon) and configure:

3.1 Connection

• API Provider: OpenAI Compatible
• Base URL:
  • StepFun (International): https://api.stepfun.ai/v1
  • StepFun (China): https://api.stepfun.com/v1
  • OpenRouter: https://openrouter.ai/api/v1
• API Key: Enter your key.
• Model ID: (stepfun/)step-3.5-flash

3.2 Parameters

• Context Window: 256000 (Crucial for large projects)
• Max Output Token: -1 (Let server decide)
• Stream: Enabled

4. Best Practices

• Auto-Approve: Enable for low-risk actions to speed up workflows.
• ASK first: Use "ASK" mode to plan complex changes before switching to "CODE" mode.
• Decompose: Break large tasks into smaller sub-tasks to leverage Flash's reasoning.
• Context Management: Use @ mentions to include only relevant files, keeping context focused.