Best auth for Claude Code
| Tool | Fit | Plugin | MCP | Skills | Why |
|---|---|---|---|---|---|
| Clerk | 5/5 | ✅ Yes | ✅ Yes | ✅ Yes | Vendor-published Claude Code plugin (own marketplace) bundling skills + Clerk MCP server |
| Auth0 | 4/5 | ✅ Yes | — | ✅ Yes | Official Anthropic-marketplace plugin with 1 skills (no bundled MCP server) |
| WorkOS | 4/5 | ✅ Yes | — | ✅ Yes | Official Anthropic-marketplace plugin with 2 skills (no bundled MCP server) |
| Firebase | 4/5 | ✅ Yes | ✅ Yes | — | Official Anthropic-marketplace plugin with MCP server (no bundled skills) |
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