first-tree.ai
First Tree builds open-source infrastructure for autonomous software-engineering teams: agents run on users' computers, coordinate through a shared team layer, and retain shared knowledge in a Context Tree. Its openTag product is an open-source AI coworker that lets teams delegate work from Slack or Lark to local coding agents running on a machine they control.
At a Glance
- Software engineers and engineering teams
- Startups and small teams that want parallel agent-based development
- Solo maintainers and developers managing repositories
- Organizations that need local execution, self-hosting, or control of code, credentials, and context
- +1 more
AI Tools by first-tree.ai
(1)
openTag
Slack Triggered Local Coding Agents
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Latest News
First Tree v0.5.23: Antigravity runtime, external Context Trees, and more reliable sessions
First Tree v0.5.22: new runtime providers, safer Team Skills, and clearer installs
First Tree v0.5.21: Feishu Agent channels and simpler setup
First Tree v0.5.20: Context influence, easier agent control, and private-deployment SSO
Products & Services
Open-source AI coworker for Slack and Lark. A user mentions a worker in a team-chat thread; openTag routes the task to a connected Mac or Linux computer, starts the selected local agent harness, and posts the result back in the thread. The server and daemon can be self-hosted under Apache 2.0.
Hosted hub for running and coordinating parallel software-engineering agents, with isolated workspaces, remote control, task automation, repository workflows, and shared Context Tree knowledge.
Portable, file-based, git-backed shared memory for agents and humans. Knowledge is held in a repository as readable Markdown and can be reviewed and versioned like code.
Market Position
First Tree/openTag positions itself as an open-source, local-first, model-agnostic alternative to hosted AI-worker products. The openTag comparison names Claude Tag and Viktor as competitors: unlike those hosted products, openTag supports any model through the user's own key or supported plan, runs on Mac/Linux, supports self-hosting, and supports Lark as well as Slack. The broader First Tree site also presents comparisons with Pydantic AI and Vibe Kanban.
Leadership
Founders
Chao Liu
CEO. Previously a Google PM and founder of Ledong, which was acquired by Alibaba; also previously at Atypical Ventures.
Executive Team
Chao Liu
CEO
Google PM and founder of Ledong, acquired by Alibaba; previously at Atypical Ventures.
Founding Story
The team says it built openTag after seeing capable coding agents such as Claude Code and Codex trapped in one person's terminal while work arrived in team chat. It wanted a lightweight, open alternative that could dispatch work from Slack/Lark, run on a computer the team controls, use the agent harness and model subscription the team already has, and keep data and memory under the team's control. The broader First Tree vision is an autonomous software-engineering team in which humans and agents work side by side with shared context.
Business Model
Revenue Model
The open-source software is free under Apache 2.0. Self-hosted users pay their own model provider and hosting costs. openTag Cloud is described as a managed cloud-sandbox option priced by tokens used, with model tokens included. First Tree's hosted Hub has a free tier and paid plans that add seats and analytics.
Pricing Tiers
Apache 2.0 software; users pay their own model-provider and infrastructure costs.
Managed cloud sandbox workers are charged according to tokens used.
The First Tree homepage states that the hosted Hub has a free tier.
Paid plans add seats and analytics; the public homepage does not state numeric prices.
Target Markets
- Software engineers and engineering teams
- Startups and small teams that want parallel agent-based development
- Solo maintainers and developers managing repositories
- Organizations that need local execution, self-hosting, or control of code, credentials, and context
- Teams using Slack or Lark/Feishu for work coordination
- Delegating engineering questions, bug reports, and implementation tasks from team chat
- Running multiple coding agents in parallel on separate branches or workspaces
- Automated GitHub issue triage, pull-request review, and repository task handling
- Shared context and memory across agents, channels, repositories, and humans
- Scheduled or unattended engineering work with human escalation when needed
- Connecting engineering agents to GitHub, Linear, Sentry, project tools, calendars, design tools, and other MCP/agent integrations
- The official First Tree homepage displays users from OpenAI, UC Berkeley, Google, Coinbase, ByteDance, and Guazi.com, but does not identify them as paying customers.
- The First Tree homepage includes testimonials attributed to engineers/designers at Adobe, Reddit, Figma, Meta, and an open-source maintainer.