Untether is an open-source agent harness and orchestrator developed by Little Bear Apps (littlebearapps). Built primarily in Python, it provides tooling and structure for managing autonomous coding agent workflows and decoupling development tasks across different coding assistant frameworks. In day-to-day operation, Untether allows developers to run and orchestrate agent tasks from the command line. The repository structure indicates direct integration and compatibility with leading frontier models and developer agent configs, including Anthropic Claude (.claude, CLAUDE.md) and OpenAI Codex (.codex), alongside configuration rules for environments like Cursor (.cursorrules). What distinguishes Untether is its focus on serving as a dedicated harness rather than a single monolithic coding assistant. By formalizing agent configurations through dedicated agent definition files (such as AGENTS.md) and harness scripts, it coordinates repetitive engineering tasks and multi-step workflows across repositories. Untether is open source and hosted publicly on GitHub under standard community licensing. As of version 0.35.x, it represents an active project tailored for developers building automated agent pipelines.
Tags: ai agent, cli, coding agent, developer tools, OpenSource