Firstmate is an agent distro that functions as a command layer to coordinate multiple autonomous coding agents across parallel tasks.
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It allows a single user, acting as captain, to delegate work to a crew of agents operating in isolated git worktrees and session backends, providing outcomes like completed PRs or investigation reports.
- 01
Unified liaison for multiple agent sessions
- 02
Event-driven, zero-token supervision
- 03
Disposable git worktrees for isolated parallel task execution
- 04
Support for persistent secondary agents (secondmates)
- 05
Durable, restart-proof state management
Open Source
Firstmate is free and open-source under the MIT license, though users are responsible for the API costs and subscription fees associated with their chosen agent harnesses.
Best for
Developers who need to manage multiple complex, parallel coding tasks or project audits without manual session juggling.
Not ideal for
Users seeking a simple one-click GUI application, model-agnostic tools, or those who do not use verified terminal-based coding harnesses.
A robust, highly disciplined orchestration layer that transforms general-purpose coding agents into a coordinated, supervised crew, ideal for power users who prioritize structural isolation and automated project management.
On 2026-10-23, the project announced full support for the Rex runtime backend.
As of
Is Firstmate free?+
Yes - Firstmate is Open Source. Firstmate is free and open-source under the MIT license, though users are responsible for the API costs and subscription fees associated with their chosen agent harnesses.
Is Firstmate open source?+
Yes - Firstmate is open source. Firstmate is free and open-source under the MIT license, though users are responsible for the API costs and subscription fees associated with their chosen agent harnesses.
Who is Firstmate best for?+
Developers who need to manage multiple complex, parallel coding tasks or project audits without manual session juggling.
Who is Firstmate not ideal for?+
Users seeking a simple one-click GUI application, model-agnostic tools, or those who do not use verified terminal-based coding harnesses.
What are the best Firstmate alternatives?+
The closest Firstmate alternatives on ai.dosa.dev are Jules by Google, OpenHands, SWE-agent - all listed under Autonomous & Async Agents.
Who makes Firstmate?+
Firstmate is developed by Kun Chen. It is listed in the Autonomous & Async Agents category on ai.dosa.dev.
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