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# omniharness / sandbox

Agent harness · Open source

OmniHarness

A self-extending agent platform that builds, registers and verifies its own capabilities.

  • Long-horizon tasks that take minutes to hours, inside per-thread Docker sandboxes
  • Self-verifying live preview: the agent can't declare victory while the build is broken
  • Subagents, persistent memory, hot-loaded skills, MCP client with OAuth
OmniHarnessthread #42 · chai-landingsandbox · docker
‹ › ↻🔒 localhost:5173gate: passing
starting dev server…

[plugin:vite:import-analysis] Failed to resolve import "./Hero" from "src/App.tsx". Does the file exist?

/app/src/App.tsx:2:17
1 | import Nav from "./Nav";
2 | import Hero from "./Hero";
  |                  ^
3 | import Menu from "./Menu";

Click outside, press Esc key, or fix the code to dismiss.

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can't say “done” while the build is red

  • Long-horizon tasks that take minutes to hours, inside per-thread Docker sandboxes
  • Self-verifying live preview: the agent can't declare victory while the build is broken
  • Subagents, persistent memory, hot-loaded skills, MCP client with OAuth
  • Multi-channel gateway: Slack, Telegram and the web UI

The bet

OmniHarness exists to remove the human from the inner loop. The agent doesn't just write code and stop — it runs the result, sees what breaks, fixes it, and confirms it's clean before handing anything back. And instead of you hand-wiring connectors and restarting the stack, the agent builds and registers new capabilities at runtime.

Self-verifying live preview

When the agent produces a web artifact, a preview auto-starts inside the sandbox and the gateway proxies it straight to your browser. A verification gate stops the agent from declaring success while the build is broken: it reads the dev-server or build error, fixes its own code, and re-checks until it's clean.

Harness foundation

Isolated Docker containers per thread for code, shell and file work; subagents for decomposing long-horizon tasks and running them in parallel; persistent memory across sessions; structured skills hot-loaded on demand; an MCP client with OAuth; and a gateway that lets you drive the agent from Slack, Telegram or the web.

Lineage, honestly

OmniHarness began as a fork of ByteDance's DeerFlow 2.0 and credits it openly. It has since diverged into an independent project with a different goal — and its README says plainly when DeerFlow is the safer pick. Because the agent writes and runs code with your credentials, the guardrails are the product: sandboxed off the control plane, with secrets scoped per capability and never exposed back to the model.

PythonLangGraphLangChainDockerMCP + OAuthTypeScriptNext.js
GitHub ↗archimedes.run ↗
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