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Developer Tools

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Wednesday, 4 February 2026

Unlocking the Codex harness: how we built the App Server

OpenAI 8 months ago 37 ● 2 sources

Codex released an App Server that uses a bidirectional JSON-RPC API to embed the Codex agent into applications. The API supports streaming progress updates, tool execution, approval workflows, and diff visualization. Developers can now integrate Codex agents directly into their own applications with standardized communication protocols.

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