... version-range scoping. All still open. What launches tonight : @grace_lee26 called it "memory of breakage," which was better than anything I'd written. @cancelkithq said the reproduce-fix-rerun loop was the part they were doing by hand. FetchSandbox MCP plugs into Cursor or Claude Code, reproduces the real failure on your own code, and once your agent fixes it, re-runs the check. You get a receipt. If you were in that thread, this roadmap came from ...

... still failed. So instead of shipping a test that said "fixed" when it wasn't, the agent tried again with a smaller, cleaner change and re-proved it. That one held. That's what I'm building FetchSandbox around: reproduce the real failure, apply the fix, then prove it holds on your actual code before you ship. For those shipping AI-written integrations, are you catching this stuff before prod, or mostly finding out when something quietly breaks? Comment from ...

... stops happening. The gap was we could only do that for bugs we'd scripted in advance. Anything unusual and the honest answer was "found it, fixed it, can't prove this one." What we built We taught FetchSandbox to write the reproduction itself, no pre-scripted test required. The safety check that makes it trustworthy A generated test could be wrong. It might pass broken code and hand you a fake green. So before we trust it, the test ... ... real bug, does it get promoted into the permanent suite as a regression guard, or is it scoped to that one fix-and-verify run and then thrown away? Second, is the reproduce-then-verify step something only FetchSandbox

... that only imagined one clean event. Curious what broke for you A bug that sailed through review and CI but still blew up in prod, and what would have actually caught it? (This is the itch I'm building FetchSandbox around, running the failure before customers do.) Comment from Omri Ben-Shoham(@omri_ben_shoham1): the reconciliation point is the real answer and it matches what i've seen elsewhere too. the part that still bugs ... ... schedule and alerting on any mismatch. Your own event store can't catch a bug in how it processes events, you need a second source of truth that didn't run through the same code. Curious whether FetchSandbox

... being straight): Pinned/frozen scenarios our fixtures are still mutable on our end, so an update from us can shift your result. No lockfile yet. Drift detection we don't yet warn you when the real API changes shape vs our model. Learning from your own past runs memory is curated per-API patterns, not your team's history. Deep coverage everywhere we import 60+ specs, but the deep failure library is real for Stripe/Paddle + a handful, thin beyond that. Auto ... ... davis23): hey Raj launch day finally. Comber went live on Product Hunt this morning (and Show HN): point it at a URL and it explores the app like a real user, catches the broken click, hands you the repro. FetchSandbox

... since the last launch, the goal was one thing: make FetchSandbox something you can actually gate a release on. not "looks tested" but provably tested. what changed: bulletproofed 5 integrations end to end: Stripe, Clerk, Descope, Resend, AgentMail. tested against how these APIs actually break in prod (webhook retries, out-of-order events, fresh-resource races), not made-up failures. Paddle got the deepest treatment:v we now throw webhook events at your billing handler out of order, duplicated ...

... keep seeing: agent finds a bug, fixes the code, declares done. what it does not do is rerun the exact failure scenario and prove the fix holds. that verification step was always on me. we just shipped something in FetchSandbox to close that loop. after it catches a bug, it now nudges the agent to rerun the same request and surface a behavioral comparison, before vs

... class of bug stops coming back. the ordering is a symptom; the real problem is handlers that have an implicit belief about what "just happened" based on which event arrived. that's exactly the scenario the permutation fuzzer in FetchSandbox is designed to surface before you ever ship it, fire every ordering, diff the final state, see which ones land somewhere unexpected. Comment from Raj Nagulapalle(@rnagulapalle): @galdayan  not the full n! .. that'd blow up exactly like ... ... leave the record it should, and not leave the one it shouldn't catches a category output-assertions structurally can't. might steal this framing. Comment from Raj Nagulapalle(@rnagulapalle): @omri_ben_shoham1  found all three by running FetchSandbox

... depends on someone being able to send a friend an actual result, not a screenshot of a promise a small group of real people ready to show up in the first hour, because I've been checking, and every competitor in my space launched on PH with zero pre mobilized support and got zero votes. Organic discovery on PH doesn't happen anymore, if it ever did. The line I keep coming back to is the difference between validating ... ... most important thing is to launch as soon as you can and keep iterating to improve, and keep launching Especially with how fast everything is moving with AI, waiting for a perfect time to launch will just let competitors

... launch yesterday (july 12th) we told you all about @FetchSandbox . today i'd rather hear about you. first, thank you. for the upvotes, but honestly more for the questions/comments n the conversations about idempotency, out-of-order webhooks, deterministic replay, and what it actually takes to gate a merge were sharper than anything i'd written for myself. a bunch of you basically handed me my roadmap. I built this because.. i kept watching ai agents write stripe ... ... back to you: what are you wiring up right now, and can this help you ship it without the launch-week surprise? if you're building solo , prompting your way through an app in cursor or claude code: connect fetchsandbox

... bursts Take marketing as seriously as building. It was my weak side, so more distribution and less hiding in the editor Build in public on X properly, share the real experience (the wins, the boring middle, the competitor that showed up last week) instead of only posting when something's polished Personal: Make real time for family, not the leftover time after shipping Protect the gym and running time even on shipping weeks I'll be documenting ... ... nika  honestly the PH launch is the main bet. if that goes well it should move the needle significantly on its own. beyond that, planning to write a few posts in dev/AI communities about the actual problem FetchSandbox

... locally (llama.cpp sidecar) and Groq's openai/gpt-oss-120b on the cloud side ... both open-weight. Once we stop trying to pick "the best model" and just treat them as different tools wired into a router, the "open-weight vs frontier" framing kind of goes away. For my own coding work I'm a Claude Code daily-driver, so my personal stack is totally different from what my product ships. But the Kilo takeaway "matching the run to the job" tracks both ... ... routing dimension. Comment from Raj Nagulapalle(@rnagulapalle): for agentic coding tasks the cost question gets way sharper because you're not running one pass, you're running 10-20 to verify the output actually works. we hit this building FetchSandbox