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Introducing Proliferate

One open-source workspace for every coding agent- Claude Code, Codex, Gemini CLI, OpenCode, and more. Run them locally or in the cloud, alone or in parallel.

Proliferate is now available.

For the last several months we've been building the place where agent-assisted engineering actually lives. Today we're releasing it as an open-source, Mac-first workspace that runs Claude Code, Codex, Gemini CLI, OpenCode, and other coding harnesses side by side- in isolated workspaces, locally or in the cloud, alone or in parallel.

Everything below ships in v0.

One workspace for every agent

Proliferate is built around harness-native execution. Claude Code, Codex, Gemini CLI, and OpenCode run the way their own CLIs run- same commands, same context, same outputs. You're not dropping into a lowest-common-denominator wrapper.

The composer exposes the choices that matter before work starts:

  • Agent- pick the harness.
  • Model- route to any model the harness supports.
  • Mode- implement, review, plan.
  • Access level- read-only, scoped edits, full workspace write.

Workspace composer controls.

Local, worktree, and cloud workspaces

Every task lives in a workspace. Workspaces are isolated environments based on your GitHub repositories- they get their own branch, working tree, setup, and sessions.

You choose where the workspace runs:

  • Local checkout- the agent works directly in an existing checkout.
  • New worktree- a clean branch and working tree for one reviewable stream of work. The safest default for code changes.
  • Cloud workspace- the agent runs on remote compute and keeps working while your laptop is closed.

Workspace target choices.

You can migrate a workspace between local and cloud at any point without losing state, and launch directly into any target from a branch, pull request, GitHub issue, or Linear issue.

Parallel agents and subagents

Proliferate treats parallel work as a first-class pattern, not a corner case. Spin up multiple agents across separate workspaces for independent tasks, or run agents inside the same workspace when they should share branch state- for example, one agent implementing while another reviews or fixes tests.

Multiple agents working in parallel workspaces.

Subagents go one level deeper: a parent agent can spawn focused helper agents to investigate, implement, or review a part of a larger task, and coordinate their results without you shuttling context by hand.

Code and plan review, built in

Review personalities are reusable reviewer prompts. Proliferate ships with separate plan review (direction, scope, requirements) and code review (diff, correctness, branch readiness) flows, and you can configure your own reviewer personalities per repository.

Code review flow with an assigned reviewer personality.

Automations

Automations run agent work from a schedule, trigger, or manual dispatch- so recurring tasks stop requiring you to open a workspace and write the same prompt every time. Each automation targets a workspace, picks an agent configuration, and optionally gates its output through a review personality.

Creating an automation with schedule, target, and review behavior.

100% open source

Proliferate's source is on GitHub. File issues, read the code, send PRs. The app is free to use on your own machine; cloud compute and team features are paid.

What's new

Features

  • Harness-native execution for Claude Code, Codex, Gemini CLI, and OpenCode.
  • Composer controls for agent, model, mode, and access level.
  • Local checkout, new-worktree, and cloud workspaces.
  • Migrate a workspace between local and cloud without losing state.
  • Launch workspaces from branches, pull requests, GitHub issues, and Linear issues.
  • Parallel agents across separate workspaces, and multiple agents inside one shared workspace.
  • Subagents: parents that spawn focused helpers and coordinate their results.
  • Plan review and code review with configurable review personalities per repository.
  • Automations with schedule, trigger, and manual dispatch, plus optional review gating.
  • Organization accounts with shared repositories, reviewer personalities, automations, and cloud settings.
  • Cmd+J opens the terminal.
  • Stop button for long-running threads.
  • Web query for Gemini.
  • One-click button to send chat history when reporting a rendering or system-level issue.
  • Commit / push / PR modal.
  • End-to-end onboarding flow.
  • macOS download, open-source on GitHub.

Bug fixes

  • Fixed a layout shift that occurred right after a message finished rendering.
  • Fixed inconsistent + / - controls across sidebar sections.
  • Fixed disorganized Settings layout- now grouped under Cowork, Cloud, and Powers.

Get started: Download for Mac, then read your first workspace. Questions or feedback- we read every email at support@proliferate.com.