Party

Party is a multiplayer workspace where a team and coordinated AI agents build software together, from idea to merge. The vendor, which is backed by Y Combinator, describes a shared environment in which product managers, engineers and agents work in one thread instead of passing work between meetings and tools. A user describes the work in plain language, and role based agents such as Research, Product, Architect, Engineer, Advisor and Auditor take on stages from ideation through build and review. Sessions show cost per agent, an approval step flags work that needs a human decision, and teammates can join a shared thread, comment on a live preview and open a pull request. The platform is model and harness agnostic, and example sessions show agents running on Codex and Claude models side by side. Spec, preview and decision records are kept alongside each session. Pricing is published in USD per month for the whole team. Free is $0 with $100 in one time credits and two concurrent active sessions, and needs no card. Starter is $20 per month with $20 in credits each month plus $200 in extra one time credits, four concurrent active sessions and email support. Pro is $200 per month with $400 in credits each month plus $400 in extra one time credits and ten concurrent active sessions. Credits are consumed by agent usage.