Bifrost CLI is an open-source unified interface that lets developers use multiple AI coding agents (Claude Code, Codex CLI, Gemini CLI, Opencode) with any AI model provider from a single command. It eliminates the need to manually manage environment variables, API keys, and provider-specific configurations by routing all requests through a centralized AI gateway. Key features include a tabbed terminal interface for running multiple agents in parallel, OS keyring-based secure credential storage, automatic agent installation, MCP integration for Claude Code, and persistent session configuration. Setup requires running the gateway locally via npx and launching the CLI interactively.