ToolsThe story, in brief
Unlocking the Codex harness: how we built the App Server
OpenAI just shipped Codex App Server—a bidirectional JSON-RPC API that lets builders embed agents with streaming, tool use, and real-time diffs.
The KeyNews take
Why it matters
OpenAI is moving Codex from research into production infrastructure. This is an app-layer bet on agent-as-a-service—developers can now embed AI agents directly into workflows with approval gates and streaming UI.
The key facts
4 to knowCodex App Server: bidirectional JSON-RPC API
Capabilities: streaming progress, tool use, approvals, diffs
Positioning: agent embedding framework for developers
Published: Feb 4, 2026
Go to the source
OpenAI Blogopenai.com
Publisher excerpt: Learn how to embed the Codex agent using the Codex App Server, a bidirectional JSON-RPC API powering streaming progress, tool use, approvals, and diffs.