@joshualevi.ai: Save this for your next build 👇 1. langfuse — see what your Claude agents actually do in prod 2. onlook — visually edit your React UI, AI writes the code 3. mastra — turn your Claude prototype into a real product 4. 12-factor-agents — the methodology behind every shippable agent 5. promptfoo — test + red-team the agents you build with Claude 6. e2b — give Claude a secure sandbox to run its own code 7. CCPlugins — drop-in Claude Code commands that save real time Which one are you installing first? 👇 #claudecode #claude #aitools #ai #coding