Gas City is an orchestration-builder SDK for multi-agent coding workflows, part of the Gas Town ecosystem of agent tooling. The open-source project has around 1,400 stars on GitHub and is among the most actively developed projects in this space, with updates landing throughout 2026.
As coding agents move from single assistants to teams of specialized agents, the hard problem becomes orchestration: deciding which agent does what, in what order, with what context, and how work is handed off and checked. Gas City provides the SDK-level building blocks for constructing those workflows yourself rather than accepting a fixed pipeline โ composing multiple coding agents into coordinated systems that can plan, implement, review, and iterate on software tasks. It comes from the gastownhall organization, whose Gas Town project popularized the idea of a managed town of coding agents with defined roles, and Gas City distills that orchestration layer into a reusable builder toolkit for your own agent crews. The project is MIT-licensed and moves quickly, reflecting how fast multi-agent coding practice is evolving. It is aimed at builders who have outgrown a single chat window with one agent and want programmatic control over how several agents share a codebase-sized task.
Free. Gas City is fully open source under the MIT license; your only costs are the model APIs your agents consume.
Developers and agent builders who want to orchestrate several coding agents as a coordinated team and need an SDK rather than a fixed product.