Anvil IDE

The open source IDE for parallel agent work.

Move faster with a fleet of Claude Codes cooking in isolation. Instantly understand their progress and what needs your attention. More agents, less pain.

Download for macOS Star on GitHub

Workspace management

One-click worktrees with scriptable setup. Parallelize without agents bumping into each other.

Native spec support

Write specs, track phases, and keep agents on track — planning is core to the IDE.

Full IDE

Terminal, file editor, diff viewer — everything you need in one editor.

REPL & orchestration

Let Claude call other Claudes programmatically. Flexible building blocks, not rigid workflows.

Flexible layouts

Arrange your agents in up to a 4×3 grid of panels. Your workspace, your layout.

Sub-agent visibility

No more black boxes. See what child and grandchild agents are actually doing.