Codex as a platform: build on the open agent harness
Blog post from OpenAI
Codex’s open-source harness provides the underlying agent runtime used by its app, CLI, and IDE extension, managing context, tool use, conversation state, streamed execution, sandbox policies, approvals, and multi-turn work. Developers can integrate this system into specialized applications rather than relying on generic chat interfaces, retaining control over their own dashboards, business rules, records, tools, and approval workflows. Codex offers several integration options: codex exec for bounded automated jobs, the Codex SDK for programmatic workflows, and app-server for persistent, interactive product integrations. A sample application called Relay demonstrates the approach in a shipment-operations dashboard, where the agent accesses application-owned tools and requires human approval for consequential changes. Examples from GitHub, JetBrains, Cisco, and tax-preparation firms illustrate how the model can support workflows beyond coding, including operations, security, support, and research, while keeping people and existing product interfaces central to decision-making.
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