AgentCraft Turns Minecraft Into a Live Claude Coding Agent Control Room
A new open-source Fabric mod turns multi-agent Claude coding into a walkable Minecraft studio, with git worktrees, in-game diffs, and merge gating.
- AgentCraft is an open-source Fabric mod running a team of Claude agents inside Minecraft.
- A lead agent plans and splits goals; workers build in parallel, each in isolated git worktrees.
- Agents walk over to a podium when they need a human decision, with in-game diff review before merge.
- No git network access, no auto-merge, agents commit under their own name for clear authorship.
- Three two-task goals on the sample repo cost about $6 total using sonnet with low effort.
- Windows only, singleplayer, Minecraft 26.3, powered by the Claude Agent SDK.
AgentCraft turns Minecraft into an agent control room
AgentCraft is an MIT-licensed interface for supervising Claude coding agents inside a Minecraft studio. Each agent works at a desk, streams its activity to an in-game monitor, and walks over when it needs a decision.
The system combines a Fabric mod, which provides the Minecraft interface, with a Node.js orchestrator called the Foreman. A lead agent uses Opus by default to inspect the repository, plan work, and review results. Up to three workers use Sonnet by default to implement tasks concurrently in separate Git worktrees.
Walk through the agent loop
A run begins when the user enters a goal at the studio console, after which the agents expose each stage of their work through the room:
- The lead reads the repository, breaks the goal into tasks, and pins them to a wall.
- Workers claim tasks and move to their desks.
- Each monitor displays the files its agent reads and the lines it changes.
- Questions requiring user judgment trigger a bell and send the relevant agent to the podium.
- The user presses
Jto answer, review changes, or approve a merge.
Six hand-pixelled characters represent the available roles: Marlow handles planning and reviews, while Juniper, Kit, Wren, Rowan, and Tove form the worker pool. Their movement, desk activity, particles, lamps, and a cupola beacon communicate current status without requiring the user to parse interleaved terminal logs.
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