Open Session is an open-source, self-hosted control room for coding agents built by the team at Tella.
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A server with a web UI and Slack, Linear, Plain and GitHub agents runs coding sessions through the Pi engine in git worktrees on your own machine or in isolated sandboxes, with multiplayer sessions and review that ends in a pull request.
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Self-hosted server: checkouts, transcripts and keys stay on your hardware
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Each session gets its own git worktree and branch for parallel agents
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Multiplayer sessions shared as links with live presence
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Sub-agents, automations from schedules, webhooks and watched channels
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Worktree terminals, branch previews and PR review beside the transcript
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Supports multiple Codex and Claude subscriptions and model APIs
Open Source
Free and open-source under the MIT license. You self-host the server and pay only for your own hardware, sandbox providers and model subscriptions or API keys.
Best for
Teams that want a self-hosted, forkable agent orchestrator with Slack, Linear and GitHub intake and full control over data.
Not ideal for
Teams that want a managed SaaS without running a server, or users who need hardened authentication out of the box, since sign-in is opt-in.
A capable open-source alternative to hosted agent platforms for teams willing to run their own server.
The tellahq/opensession repository, created in June 2026, is active with commits on November 9, 2026 and over 400 GitHub stars.
As of
Is Open Session free?+
Yes - Open Session is Open Source. Free and open-source under the MIT license. You self-host the server and pay only for your own hardware, sandbox providers and model subscriptions or API keys.
Is Open Session open source?+
Yes - Open Session is open source. Free and open-source under the MIT license. You self-host the server and pay only for your own hardware, sandbox providers and model subscriptions or API keys.
Who is Open Session best for?+
Teams that want a self-hosted, forkable agent orchestrator with Slack, Linear and GitHub intake and full control over data.
Who is Open Session not ideal for?+
Teams that want a managed SaaS without running a server, or users who need hardened authentication out of the box, since sign-in is opt-in.
What are the best Open Session alternatives?+
The closest Open Session alternatives on ai.dosa.dev are Jules by Google, OpenHands, SWE-agent - all listed under Autonomous & Async Agents.
Who makes Open Session?+
Open Session is developed by Tella. It is listed in the Autonomous & Async Agents category on ai.dosa.dev.
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