TrueForge
by TrueFoundry
Open-source agent harness — the runtime layer that turns an LLM into a working agent, positioned as a self-hosted alternative to hosted “managed agent” offerings like Claude Managed Agents.
See https://github.com/truefoundry/trueforge
What it runs for you
TrueForge owns the full agent execution loop rather than being a thin
prompt-and-call wrapper: model calls, MCP tool use, skills, sandboxing,
approvals, context management, and session state. It exposes that loop
through three surfaces — a chat UI, an HTTP API with a TypeScript SDK, and
an embeddable UI SDK for building agent experiences into another product.
Features
- Any model provider — OpenAI, Anthropic, Google Gemini, or any
OpenAI-compatible endpoint; no lock-in to a single vendor’s agent runtime. - MCP tools — connects to remote MCP servers with header auth or OAuth,
including in-chat authorization flows. - Skills — git-backed
SKILL.mdinstruction packs, loaded on demand
inside the sandbox rather than always resident in context (the same
progressive-disclosure pattern as Skills over MCP). - Sandboxing — isolated code execution via Daytona, with secret
management for the sandboxed environment. - Human oversight — tool-approval workflows and generative UI
checkpoints so autonomous runs can pause for a human decision. - Context management — subagents, deferred loading, and result
compaction to keep the running context budget under control (see
AI Context Engineering). - Deployment flexibility — local mode (SQLite) for individual use;
hosted mode (PostgreSQL + Redis) for teams, deployable via Docker Compose,
Kubernetes, or Railway.
Positioning
TrueForge’s own benchmarks compare it against Claude Managed Agents and
deepagents on the same tasks, tools, and model, reporting matching
accuracy at lower cost. The pitch is that teams get the “managed agent”
experience (a hosted runtime that handles the loop, tools, and state)
without being locked into a single vendor’s managed service — self-hosted,
open source (MIT), and provider-agnostic.
Adoption
~5.6k GitHub stars as of September 2026; built in TypeScript.