LuciferMornens/vengeance

Parallel coding agents, driven beautifully.
Two bundled engines behind one desktop app for Windows, macOS and Linux.
Features ·
Two engines ·
Download ·
Getting started ·
Development ·
Documentation
Screenshots are Windows captures of the interface running against the built-in mock engine with
sample data, not a real model run. Automated captures do not show the Windows 11 Mica backdrop.
## Why Vengeance
Vengeance is a desktop app for Windows, macOS and Linux that puts two coding-agent engines,
Engine and Engine 2, behind one interface. Run several agents at once, move a conversation
from one engine to the other, and manage models, accounts, packages and MCP servers from structured
editors instead of only hand-editing JSON. Both engines ship inside the app, so you never install
either one separately.
## Features
### Run agents in parallel
Several agents at once. Sessions run side by side, and live activity indicators in the sidebar
show which ones are working.
Background sessions. Closing the tab of a saved Engine 2 session leaves it running and listed
under Background sessions; Stop session ends one explicitly, and its history stays saved.
Temporary unsaved Engine 2 sessions stop when closed.
Subagents. Engine 2 has native subagents, with each subagent's history kept beneath its parent
session and managed under Engine controls. Engine delegates through a subagent extension, which
you can find in Settings → Extensions. With one installed, delegated work appears in the
transcript and in the inspector's Agents panel, where you can answer, steer or stop a worker that
needs a decision.
Workspaces. Switch workspaces from the sidebar, choose which engine new sessions use, and pick
up from recent sessions or suggested prompts. A folder that is deleted or on an unmounted drive
is left out of the switcher until it is back, unless it is the active one. A folder found only
through its saved history also leaves once its last session is gone.
With a subagent extension installed, a worker that needs a decision surfaces in the transcript and the Engine's Agents panel, with live activity beside it.
Jump between workspaces, choose the engine new sessions start with, and resume recent work.
### Choose your engine, then change your mind
Per workspace or per session. Starting a session from the composer menu or the sidebar's
new-session menu never changes the workspace default. Change the default from the workspace
switcher's New session default selector or in Settings.
Switch mid-conversation. An idle saved conversation can move between Engine and Engine 2 in the
same tab. Your draft and the selected branch's history carry over, and the destination uses its own
model and settings. See Good to know for what does not transfer.
### Read exactly what the agent did
Tool cards. Tool calls render as cards with diffs, an ANSI-colored console and syntax
highlighting. Consecutive calls group into expandable activity rows.
A transcript that renders. Markdown with tables and highlighted code, plus Mermaid diagrams.
Todo list. When a todo extension or tool supplies a task list, it docks above the composer and