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a3rig is a command-line tool published by DiGii that automates the creation of a local Arma 3 mod testing environment, launching a HEMTT dev build, two game clients, and a dedicated server with a single command. Designed for Arma 3 mod developers, it falls within the game development and mod testing category of developer tooling. Rather than manually configuring multiple Arma 3 instances and verifying that each loads the correct mod set, a developer working inside any HEMTT project can invoke a3rig to build and launch a complete local multiplayer test environment in one step. The tool runs the HEMTT dev build, starts two game clients on separate Arma profiles, brings up a dedicated server, and then tails the server log so that the developer can monitor runtime behavior as soon as the environment is live. A key characteristic of a3rig is that it reproduces HEMTT's mod resolution exactly, meaning every process involved in the test session loads the same mods in the same order, which eliminates a common source of inconsistent and misleading test results when clients and server disagree about what is loaded. In addition, a3rig checks the server configuration up front for the settings that would otherwise silently break a local rig, surfacing configuration problems before the environment starts rather than letting them fail later in less obvious ways. Typical use cases include rapid iteration during mod development, local multiplayer testing without deploying to a remote server, and validating that a mod behaves correctly across multiple simultaneous clients connected to a dedicated server. The current version of a3rig is 0.2.0, and the software has been distributed in two versions to date, reflecting its early-stage development status. Published by DiGii, a3rig targets developers already working within the HEMTT toolchain and the broader Arma 3 modding ecosystem.
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