Show HN: Stop parallel AI coding sessions clobbering each other's handoffs

Category: devtools

Tags: ai-coding, concurrency, developer-tools, hook-enforced, lock-file

Score: 6.8/10 (Innovation: 6, Technical: 8, Documentation: 7, Utility: 6)

Claude Handoff Guard uses PreToolUse hooks to manage ownership markers inside handoff files, blocking concurrent overwrites from parallel AI coding sessions. It cleverly leverages a designed failure as a handshake to embed session IDs, addressing a nontrivial concurrency problem in collaborative AI development workflows.

Target audience: backend devs, devops

Repository: https://github.com/joshduffy/claude-handoff-guard · JavaScript · MIT

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