Claude Code Router on Company Laptops

Installing Claude Code Router 3.1.3 from npm on a Mac caused the tool to write ANTHROPIC_BASE_URL=http://127.0.0.1:3456 into ~/.claude/settings.json before any traffic was launched through it, and the next plain `claude` session ran through the router. Claude Code Router, an MIT-licensed open source local model gateway published as `claude-code-router` on GitHub, describes itself in its README as "a local model gateway and control plane for coding agents" that gives Claude Code and nine other agents "one stable local endpoint" while managing providers, models, routing rules and keys behind it.

On November 9, 2026 we installed Claude Code Router 3.1.3 from npm on a Mac, gave it one provider a mock server on 127.0.0.1 with a dummy key and started it. Before we had launched anything through it, it had written ANTHROPIC BASE URL=http://127.0.0.1:3456 into ~/.claude/settings.json , and the next plain claude session we opened went through the router. Claude Code Router CCR, claude-code-router on GitHub https://github.com/musistudio/claude-code-router is an open source, MIT-licensed local model gateway that lets Claude Code use models from other providers. Its README calls it “a local model gateway and control plane for coding agents” that gives Claude Code and nine other agents “one stable local endpoint”, while you manage the providers, models, routing rules and keys behind it.