https://denv.ai/blog/ denv is the environment company. Environments you can version, fork per rollout, and grade apart from the agent: build one in Harbor, Inspect, OpenEnv, verifiers, HUD, Karotte, or your own framework, and denv runs it as a whole system, with its data, on your cloud or any sandbox. Agents run in it, get evaluated in it, and models train against it. We never own your compute or your data. en-us https://denv.ai/blog/creating-an-environment/ https://denv.ai/blog/creating-an-environment/ Sat, 10 Oct 2026 00:00:00 GMT Connect GitHub and a target. Describe the environment as a compose file. denv deploys it in phases, snapshots it, and lets you fork, replay, roll back, and hand it to any framework. https://denv.ai/blog/harbor/ https://denv.ai/blog/harbor/ Sat, 10 Oct 2026 00:00:00 GMT Run any Harbor dataset with denv as the environment backend, import Harbor tasks as denv projects, and export denv environments as Harbor task directories. https://denv.ai/blog/inspect/ https://denv.ai/blog/inspect/ Sat, 10 Oct 2026 00:00:00 GMT Use denv as an Inspect sandbox with sandbox="denv". Samples get a forked environment instead of a fresh container, and the eval log records what the environment was. https://denv.ai/blog/openenv/ https://denv.ai/blog/openenv/ Sat, 10 Oct 2026 00:00:00 GMT Run OpenEnv environment images on denv with DenvProvider, fork them mid-episode, and export a denv version as an OpenEnv environment so every trainer that speaks OpenEnv can use it. https://denv.ai/blog/verifiers/ https://denv.ai/blog/verifiers/ Sat, 10 Oct 2026 00:00:00 GMT Train with prime-rl against denv environments two ways — through verifiers' Harbor taskset with denv as the Harbor backend, or with a denv sandbox inside a verifiers environment. https://denv.ai/blog/hud/ https://denv.ai/blog/hud/ Sat, 10 Oct 2026 00:00:00 GMT Run HUD environments on denv as a runtime, give HUD's MCP-driven agents a forkable world, and move HUD datasets between HUD and Harbor without leaving denv. https://denv.ai/blog/karotte/ https://denv.ai/blog/karotte/ Sat, 10 Oct 2026 00:00:00 GMT Karotte's five protections, now with versions, snapshots, forks and multi-service worlds. Run Karotte environments inside denv and import them as denv projects. https://denv.ai/blog/trainers/ https://denv.ai/blog/trainers/ Sat, 10 Oct 2026 00:00:00 GMT SkyRL, verl, rLLM, prime-rl, TRL and Tinker already read Harbor and OpenEnv. denv builds and runs the environment; the trainer reaches it through those two formats, and rollouts fork instead of rebuild.