my coding agent now deploys its own changes to a sandbox and tests them before i merge

I have a bot on one of my repos that drafts replies to new issues (kinda like greptile?) after testing. claude code writes most of the changes to it now, but there was a verification gap I hadn't solved yet. until now, my check was running the code locally and clicking through the app myself. every change. went looking for something like preview deploys but for agent servers, and it turns out mastra (the typescript agent framework the bot's built on) shipped exactly that a few days ago. With the new setup: the coding agent now deploys the whole project to a throwaway sandbox (E2B, Daytona) it gets a public URL back for the API and one for a chat UI it curls its own endpoints and checks the responses before opening the PR the sandbox expires on a timer, nothing to clean up This time, tests were green and i didn't need to run anything locally. Worth a look