HAR
Open-source isolation and verification tool for AI coding agents
About HAR
HAR is an open-source agent tool for AI coding workflows, available as both a CLI and an MCP server. It creates an isolated, consistent worktree for each coding agent and handles startup, verification, and cleanup as unified stages; it also records logs, artifacts, and verification tree hashes so teams can audit execution evidence. HAR also supports tracking projects, worktrees, runs, and verification results from a local dashboard.
Best for
Best use cases
Create isolated worktrees, ports, and databases for coding agents
Run multiple agents on development tasks concurrently
Run agent tasks with unified startup, verification, and cleanup stages
Review logs, artifacts, and verification tree hashes
Features
Isolated worktrees
Gives each coding agent its own independent, consistent worktree.
Deterministic verification
Runs agent tasks with unified startup, verification, and cleanup stages.
Concurrent runs
Assigns separate worktrees, ports, and databases to different agent slots.
Mission Control
Track projects, worktrees, runs, verifications, and artifacts in a local dashboard.
Pros
- Works with Claude Code, Cursor, Codex, and any MCP agent
- Provides both a CLI and an MCP server
- Keeps auditable logs, artifacts, and verification tree hashes for every run