Native Model Switching in Codex and Claude Native Model Switching in Codex and Claude introduces a visual workflow builder with protocol-level enforcement for AI coding agents, offering per-state tool enforcement, decision checkpoints, and transition audit logs. The tool is free to start with 200 transitions per month on the free tier, and its engine is open-source on GitHub. Visual workflow builder with protocol-level enforcement for AI coding agents. Your AI agent gets the right tools in each phase — nothing more, nothing less. No prompt engineering. No jailbreaks. Structural guarantees. Tool enforcement per phase. Fewer wasted tokens. Your tools, automatic. 1. Design your workflow — drag states, draw transitions, assign tools per phase. 2. Connect your agent — two commands in Claude Code. 3. Agent follows the process — every transition enforced, every tool call audited. Per-state tool enforcement. Decision checkpoints. Edit and command guards. Transition audit log. Free to start. No credit card. 200 transitions/month on the free tier. Sign up free | View pricing | GitHub open-source engine