Dev builds FetchSandbox to test agent workflows without hooking up real accounts
Common_Dream9420 · reddit · 2026-10-09
The author is building FetchSandbox to solve a recurring pain: the only way to test an agent-built workflow is to connect real accounts, so real emails, calendar invites, and Slack messages fire before you know the logic is right.
The trickier issue is receipts: a success status doesn't mean the app did the right thing. The sandbox checks resulting state, replays webhooks, and catches retry-induced duplicates like double charges or repeated emails that tests would never surface.
They're asking the community which workflows are hardest to test safely pre-launch — the email-to-calendar-to-Slack confirmation chain is the most-cited candidate — and inviting stories from people who just yolo'd with real accounts and broke things.
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