Moltis is an open-source CLI coding agent and agent harness written in Rust by the Moltis organization (formerly maintained under penso/moltis). It is designed to provide high-performance terminal-based code generation, inspection, and automated repository manipulation without heavy runtime dependencies. Moltis operates directly within the developer's terminal, interfacing with large language model backends such as Anthropic Claude. The agent processes instructions by running contextual tool calls, including repository file reading, code generation, testing, and built-in search integrations such as Brave search to pull external context during development sessions. A key architectural differentiator of Moltis is its support for the Agent Client Protocol (ACP) over stdio. This enables Moltis to function either as a standalone CLI tool or as an embedded headless agent engine orchestrated by ACP-compatible developer tools and IDEs. Built in Rust, it emphasizes fast startup times and minimal system overhead compared to Python- or TypeScript-based agent runtimes. Moltis is open source and hosted publicly on GitHub with preconfigured Homebrew tap distribution and standard Rust toolchain builds.
Tags: agent harness, ai agent, cli, developer tools, OpenSource, personal assistant