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firstmate
Pricing
- Model
- Free
Summary
Tab-juggling three coding agents across separate terminals, losing track of which worktree has the failing test, copy-pasting context between sessions — that's the ceiling most multi-agent setups hit immediately. firstmate is built to break through it.
firstmate puts a single orchestrating agent — the 'first mate' — in front of you, while it spawns a crew of autonomous coding agents behind the scenes, each isolated in its own git worktree. You describe what needs doing; the crew splits the work in parallel and keeps collisions out of your main branch. The visible session backend means you can watch what each agent is doing without switching tabs. The architecture works cleanly for investigation tasks, parallel fixes, or supervised PR generation — the constraint is that there is no API surface, so anything requiring programmatic integration into an existing CI pipeline has to wire around the tool manually.
Bottom line: Pick firstmate when your bottleneck is coordinating parallel coding tasks you'd otherwise babysit across three terminals; skip it when your team needs programmatic control over agent dispatch from inside an existing pipeline.
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Pros
Sign in to edit- Crew-based parallel dispatch, so three investigation or fix tasks run simultaneously instead of sequentially — cutting the wall-clock time you'd spend babysitting separate agent sessions.
- Per-agent git worktree isolation, which means parallel agents working on adjacent code do not produce mid-run merge conflicts that you have to untangle before any output is usable.
- Visible session backend for the whole crew, so you can monitor what each agent is doing without switching terminals or losing track of which session held the failing test.
- Self-hosted under MIT license with no paid features gated behind a tier, so teams with data-residency or audit requirements can deploy it without a vendor conversation.
- Supervised agent loops with PR or report output as the end state, which means you review finished work rather than raw agent traces — keeping you in the loop at the decision point that matters.
Cons
Sign in to edit- No API surface exists in the architecture, so teams that need to trigger agent crews from a CI system or external scheduler have to build shell-level integrations against a tool not designed for that pattern — and maintain that glue code themselves.
- The crew model requires a human interacting with the first mate agent as the starting point; fully unattended, scheduled agent runs with no human in the dispatch loop are not a supported workflow, which is the condition under which teams move to an orchestration framework that exposes a programmatic entry point.
- Community support through GitHub issues is the primary support channel — with 29 open issues noted on the repo — so teams encountering edge-case failures in production have no escalation path beyond the open-source community.
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About
- API Available
- No
- Self-Hosted
- Yes
- Last Updated
- 2026-07-14T13:50:37.521Z
Best For
Who it's for
- Developers managing multiple simultaneous agent tasks
- Teams needing visible oversight of agent crews
- Projects requiring clean, non-colliding worktrees
What it does well
- Parallel coding tasks across multiple project areas
- Supervised autonomous agents producing PRs or reports
- Isolated investigation and auditing without context switching
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Frequently Asked Questions
- Is firstmate free?
- Yes — firstmate is fully free to use. There is no paid tier.
- Is firstmate open source?
- Yes. firstmate is open source.
- Can I self-host firstmate?
- Yes. firstmate supports self-hosting on your own infrastructure.
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Curated lists that include this category
Running one coding agent is a solved problem. Running three simultaneously — each on a different project area, each producing clean output without stomping on the others — is where most setups collapse into tab chaos. firstmate addresses this by introducing a crew model: one agent you talk to dispatches and supervises a set of autonomous coding agents, each operating in an isolated git worktree. You give a high-level directive; the first mate breaks it apart, assigns work, and manages the crew’s output so you receive PRs or reports rather than half-finished terminals.
The worktree isolation is the architectural decision that separates firstmate from a simple wrapper around parallel agent calls. Each crew member gets a clean branch context, which means two agents working on adjacent parts of the codebase do not produce merge conflicts mid-run. The vendor describes this as ‘non-colliding worktrees,’ and it is what makes parallel investigation and audit tasks tractable — an agent can read and probe one part of the repo without touching another agent’s working state.
firstmate is a self-hosted, open-source tool released under MIT license with no hosted offering and no API surface. That is a deliberate tradeoff: teams that want full control over where the agents run and what they touch can deploy it without negotiating vendor access. The tradeoff is that teams needing to trigger agent crews programmatically from a CI system or external orchestrator have no built-in hook — they are writing shell integrations against a tool not designed for that use case. The fit is strongest for developer-facing workflows where a human is present to talk to the first mate and review what the crew produces before it ships.