Prompt optimization loops and regression test suites for Claude Code, with a companion web UI.
prompt-lab-mcp is an MCP project maintained in the jurek-f/prompt-lab-mcp repository. The maintainer describes its purpose as “Prompt optimization loops and regression test suites for Claude Code, with a companion web UI”. Read the project documentation for the complete scope.
The maintainer’s configuration uses https://prompt-lab-mcp.up.railway.app/mcp. It declares streamable-http transport. Check the project’s account and authentication instructions when adding the endpoint to your client.
Project documentation · Repository · Discovery listing. This profile records the public documentation checked on 2026-10-08.
{
"mcpServers": {
"prompt-lab": {
"type": "http",
"url": "https://prompt-lab-mcp.up.railway.app/mcp"
}
}
}From the project documentation. Replace placeholders and example paths before connecting.
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