TrueForge: The Open-Source Agent Harness for Reproducible Agent Runs
An open source agent harness is the runtime layer that turns a raw LLM into a working agent, handling the execution loop, tool calls, sandboxing, and context management so runs are reproducible. TrueForge is a TypeScript, MIT-licensed harness that delivers this in one process with SQLite locally or Postgres and Redis when hosted, claiming the same accuracy as Claude Managed Agents and deepagents at lower cost. What Is an Agent Harness and Why Does It Matter? Building an agent is easy; running one well is hard. The gap between a prompt that calls a model and a system that reliably completes multi-step tasks is exactly what an agent harness fills. A harness is the software layer that owns the agent execution loop: it decides when to call the model, how to route tool invocations, how to manage the growing context window, and how to keep the whole run safe and auditable. ...