What are the best AI collaboration tools for dev teams?

The best AI collaboration tool for a developer team depends on what the team wants to share. If you live in Slack, Slack Code brings agents into your channels. If you want an open-source workspace that replaces chat and Git hosting, Buzz does that, and Nimbalyst gives Claude Code and Codex a shared visual workspace. If one developer wants several agents, Claude Code's agent teams and the Codex plugin for Claude Code are enough, and if each teammate runs their own agent on their own plan, Joxo joins those agents into one project.

How should a team choose an AI collaboration tool?#

Ask three questions before reading any feature list:

Who is collaborating? One developer with several agents is a different problem from several developers, each with an agent.
Where should the work live? In your chat, in a new workspace, in the repository, or where it already is.
Whose plans run the agents? A partner agent the tool provides, a company plan, or each person's own subscription.

Most disappointment with these tools comes from buying an answer to the wrong question: a multi-agent tool for one person, bought by a team of four.

Which tools are worth knowing?#

Slack Code: agents inside Slack#

Slack launched Slack Code on 20 August 2026. You mention a coding agent in Slack, such as Claude, Devin, GitHub Copilot or Vercel's, and a code channel opens for that task with the diffs and a live preview. Slack says ChatGPT is coming. Pick it when the team already works in Slack and uses those agents. Joxo vs Slack Code compares the two.

Buzz: an open-source workspace for people and agents#

Block released Buzz on 21 July 2026 under the Apache 2.0 licence. It is a complete workspace, with channels, threads, direct messages, voice, code repositories and workflows, and agents such as Claude Code, Codex and goose join as members. You can run it yourself or use Block's hosting. Pick it when the team wants to own its stack and replace its chat and Git hosting in one move. Joxo vs Buzz has the detail.

Nimbalyst: a visual workspace for Claude Code and Codex#

Nimbalyst is an MIT-licensed desktop app for macOS, Windows and Linux that puts coding sessions, tasks, docs, diagrams and mockups in one place. It runs Claude Code and Codex, with OpenCode and Copilot in alpha. Its Teams plan adds real-time co-editing of shared documents and trackers, where each teammate's local agents edit the same files; it is listed at $20 per user per month, with no charge during its beta. Pick it when the team wants to plan and write specs together in one visual editor. Joxo vs Nimbalyst sets out the trade-offs.

Claude Code agent teams: one person's helpers#

An experimental Claude Code feature where one lead session splits a job between helper sessions it starts. It organises the agents of one person on one computer. Pick it when the bottleneck is how much one developer can run at once. Joxo vs Claude Code agent teams explains how the two fit together.

The Codex plugin for Claude Code: a second opinion on demand#

OpenAI's Codex plugin for Claude Code lets Claude Code ask Codex for a review or hand it a task, using the person's own Codex sign-in. It connects one person's two tools. Install it from inside Claude Code:

/plugin marketplace add openai/codex-plugin-cc
/plugin install codex@openai-codex
/codex:review --base main

Joxo vs the Codex plugin covers when you want one, the other or both.

AGENTS.md and notes in the repository: the baseline#

Not a product, and often enough. A committed AGENTS.md (imported by CLAUDE.md) gives every agent the same rules; a TASKS.md and a DECISIONS.md carry who is doing what and what was decided. It costs nothing and works for any agent. It is slow, because every update waits for a push and a pull. Joxo vs notes in the repo is the honest comparison.

AgentsRoom: a command centre for a team's agents#

AgentsRoom is a desktop app with a mobile companion. It gives a team built-in agent roles, a prompt library kept in the repository, and one dashboard across projects. It lists 14 supported agents, Claude Code, Codex CLI and GitHub Copilot CLI among them, and each developer brings their own subscription or key. It costs nothing for up to two projects per installation. Pick it when the team wants shared prompts, roles and a view across many repositories.

Joxo: one project across everyone's own agents#

Joxo is a team channel for AI coding agents. Each teammate pastes one line into the agent they already run (Claude Code, Codex, Cursor, OpenCode and more, 28 on the supported agents list), and the agents share one task board, decisions and handoffs that carry the branch and the commit. Only one agent can hold a task; a second claim is refused and told who holds it. Each person keeps their own plan, and Joxo runs no model. The iPhone app, in TestFlight, tells you when an agent is waiting on you. Joxo is closed source and hosted, with a 14-day trial and no card needed, then $15 per person per month. Pick it when teammates use different agents and plans and nobody wants to move to a new workspace.

How do they compare?#

Tool	What it is	Best when	Agents	Source and hosting	Price
Slack Code	Code channels inside Slack	The team lives in Slack	Slack's partner agents	Closed, hosted by Slack	See Slack's site
Buzz	Workspace for people and agents	Replacing chat and Git hosting	Claude Code, Codex, goose, others	Apache 2.0, self-hosted or Block-hosted	Open source; see buzz.xyz for hosting
Nimbalyst	Visual workspace and editors	Planning and specs together	Claude Code, Codex; OpenCode and Copilot in alpha	MIT desktop app	Individual at no cost; Teams $20 per user per month, no charge in beta
Claude Code agent teams	One lead session and its helpers	One developer, many tasks	Claude Code	Part of Claude Code	Your Claude plan
Codex plugin for Claude Code	Codex reviews and tasks from Claude Code	One developer, two tools	Claude Code and Codex	Plugin on GitHub	Your Codex plan
AGENTS.md and notes	Shared files in the repo	Small teams, slow change	Any	Your repository	Nothing extra
AgentsRoom	Desktop and mobile command centre	Shared prompts and roles	14, including Claude Code and Codex	Desktop app	No charge up to two projects per installation
Joxo	Team channel across own agents	Mixed agents and plans	28, 8 tested end to end	Closed source, hosted	14-day trial, then $15 per person per month

When is Joxo the wrong choice?#

When everyone already works in Slack with Slack's partner agents, Slack Code is the shorter path. When the team requires open source or self-hosting, Buzz or Nimbalyst fit and Joxo does not. When you want several people editing one document live, a shared workspace does that better. When only one person is coding, agent teams or the Codex plugin are enough. How Joxo compares by category and the comparison pages go through each case.

Frequently asked questions#

What is an AI collaboration tool for developers?#

A tool that lets people and their AI coding agents work on the same project without stepping on each other. Some bring agents into a chat, some give everyone a shared workspace, and some connect the agents each person already runs so they share tasks, decisions and handoffs.

Do these tools work with Claude Code and Codex?#

Most do, in different ways. Buzz, Nimbalyst, AgentsRoom and Joxo work with both. The Codex plugin connects the two for one person. Slack Code works with its partner agents, and Claude Code agent teams are Claude Code only.

Which AI collaboration tool is best for a hackathon team?#

One that takes minutes to set up and does not ask anyone to change agent or plan. For a team of two to five where each person brings their own agent, a shared project such as Joxo, or shared files in the repository, is quicker than adopting a new workspace. Splitting work between AI agents at a hackathon walks through a weekend setup.

Is there an open-source option?#

Yes. Buzz is Apache 2.0 and Nimbalyst is MIT licensed. Joxo is closed source.