Branch Agent lets developers fork and merge LLM conversations like Git branches

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A developer tool called Branch Agent brings Git-style branching to large language model conversations, allowing users to fork, run, and compare AI chats across parallel timelines. Each branch can be configured independently with its own system prompt, model, provider, and temperature settings, eliminating the need for manual copy-pasting between browser tabs. The tool is built on a Next.js frontend, a Python FastAPI backend using the Agno agent SDK, and a Convex database that handles reactive queries and atomic mutations. Forking is storage-efficient, using pointer references rather than duplicating message history, making each fork an O(1) operation. An AI Judge Agent can compare branches side-by-side and merge the preferred responses back into a single conversation thread.

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