Show HN: 143.dev – we open-sourced our internal coding-agent infrastructure
Assembled open-sourced 143.dev, its internal system for running coding agents as shared team infrastructure. The MIT-licensed platform runs Codex, Claude Code, and others in sandboxes, integrating with GitHub, Slack, and more for centralized control and introspection.
Background
Assembled makes workforce-management software (used by Stripe, Discord). This open-source project solves a practical problem: AI coding agents (like Claude Code or GitHub Codex) are useful for individual engineers, but a mess to coordinate across a team — everyone runs different setups, with no shared visibility or tooling.
- 143.dev is a self-hostable platform (MIT license) that runs coding agents in secure sandboxes (gVisor), connects them to shared tools (GitHub, Linear, Slack, PagerDuty), and logs everything agents do so humans can review and debug.
- It lets teams mix different AI models per task (e.g., cheaper model for automation, smarter one for complex work).
- The name "143" is a joke HTTP status code meaning "I'm thinking" — a reference to the slow, deliberative pace of AI coding agents.
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