@joshualevi.ai: Save this for your next build ๐ 1. langfuse โ see what your Claude agents actually do in prod 2. onlook โ visually edit your React UI, AI writes the code 3. mastra โ turn your Claude prototype into a real product 4. 12-factor-agents โ the methodology behind every shippable agent 5. promptfoo โ test + red-team the agents you build with Claude 6. e2b โ give Claude a secure sandbox to run its own code 7. CCPlugins โ drop-in Claude Code commands that save real time Which one are you installing first? ๐ #claudecode #claude #aitools #ai #coding