Blast Shield

Blast Shield isolates agent writes so parallel swarms do not corrupt shared files without an explicit merge path.

Mechanisms

Mode	Description
worktree	Git worktrees per agent (default, production-ready)
overlay	Memory-mapped virtual FS overlay (POC; requires overlay-fuse feature)

Behavior

• Each agent runs in an isolated worktree under .pytxo/worktrees/
• Overlapping paths in pytxo.toml tasks trigger separate scheduling waves
• Worktrees are removed after run unless --keep-worktrees is set

Configuration

isolation = "worktree"

Target: sub-5ms rollback with disk flush only on approve (overlay roadmap).

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