Mains 0.3.0: our first public release

Today marks a major milestone: Mains 0.3.0 is our first public release — and it is fully open source under the MIT license at github.com/mainsdotdev/mains.

Mains is a desktop app for running AI coding agents in managed workspaces. It wraps the GitHub Copilot, Claude Code, and Cursor SDKs and the OpenAI Codex app server, tracks every run with full observability, and syncs issues from the tools you already use — all from one place.

What's in 0.3.0

Agents

Multi-Agent - Run GitHub Copilot, Claude Code, OpenAI Codex, and Cursor side by side
Session Management - Resume, continue, and fork agent sessions across runs
Tool Approval - Interactive approve/deny flow for agent tool calls with pre-approved tool lists
MCP Support - Extend agents with Model Context Protocol servers for APIs, databases, and internal systems

Workspaces & Projects

Git-backed Workspaces - Status tracking from backlog to done, worktree isolation, and per-run diffs
Projects - Group workspaces by remote origin with setup/run/archive scripts and shared commit/PR instructions
Code Reviews - Request structured reviews with severity-tagged findings, file locations, and suggestions
Context Injection - Attach files, diffs, selections, terminal output, linked issues, and Sentry errors as run context

Integrations

Issue Sync - Connect GitHub, GitLab, Linear, Jira, Asana, and Trello issues directly to a workspace
Error Tracking - Sentry issues synced as signals with stack traces, affected users, and regression info
Dependency Guards - Package security checks via Socket.dev before installs (npm, pip, cargo, go, gems)

Observability

Stats Dashboard - Daily runs, cost breakdown by model, tool usage analytics, and success rates per provider
Run Artifacts - Collected patches, files, logs, reports, and command results per session
Cost Tracking - Token usage and USD cost per run with cache metrics

Privacy First

Mains runs agents inside isolated workspaces with full visibility into the exact actions they take. You stay in control of context, changes, and final commits.

Getting Started

Mains 0.3.0 is available for macOS (Apple Silicon and Intel).

Download Mains and configure a provider (Copilot, Claude, Codex, or Cursor)
Link a repository and create a workspace
Attach a task, run an agent, and review the diff before committing

Since Mains is now open source, you can also clone the repo, star it, or contribute at github.com/mainsdotdev/mains.

We cannot wait to see what you build with Mains.

Questions or feedback? Reach out to team@mains.dev