Hermes Agent is a fully open-source AI agent by Nous Research that grows with its user through persistent multi-level memory across sessions. Written in Python 3.11+, it functions as a personal AI assistant that can be installed on any machine and connects to messaging platforms including Telegram, Discord, Slack, and WhatsApp through a unified gateway process. The agent learns user preferences, projects, and environment over time, building its own skill library. It ships with 40+ bundled skills covering MLOps, GitHub workflows, diagramming, note-taking, and more. Key capabilities include subagent spawning for parallel task execution, scheduled task automation via an integrated cron scheduler, and real sandboxing through five terminal backends (local, Docker, SSH, Singularity, Modal). Hermes Agent supports any LLM provider including Nous Portal, OpenRouter with 200+ models, and custom VLLM/SGLang endpoints, with interactive model switching requiring no code changes. The project also includes Mini-SWE-agent and Tinker-Atropos submodules for agentic reinforcement learning research.