Why AI Coding Agents Fail (And How to Fix Them)

This video is sponsored by Upstash. Try Upstash Box: https://upstash.com?utm_source=prompt1 What is a software factory, and how do you build one? In this video I explain the idea, then build a working software factory with Claude Code running in Upstash Box sandboxes and point it at a real repo with 10 GitHub issues. It finished in 4 min 34 s, opened 9 pull requests, skipped the one vague issue, and all 9 fixes passed hidden tests the agents never saw. What you'll learn: - The core loop behind every software factory: issue → agent → independent check → human merge - Why running coding agents in parallel breaks, and the five fixes (sandbox per agent, claim labels, separate verifier + reviewer, live docs, human merges) - How Upstash Box gives each agent its own cloud sandbox: fast boot, snapshots, isolation, pause/resume, egress allowlists - A four-stage pipeline (triage, worker, verifier, reviewer) with typed handoffs between boxes - Grounding agents with Context7 live docs, with the API key injected outside the box - Why 7 of 9 verified PRs still conflicted, and the integrator stage that merged them - What it actually cost: $3.67 for the run, $6.37 for the integrator, about $0.01 of Box compute Links: - Factory code: https://github.com/PromtEngineer/software-factory - Upstash Box docs: https://upstash.com?utm_source=prompt1 - Context7: https://context7.com - Context7 Search (Upstash blog): https://upstash.com/blog/context7-search #softwarefactory #claudecode #aiagents #upstash