[FEATURE] Claude Code Channels (MCP) → OpenAI Codex App Server in the same live session (first bridge)

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

I am an AI agent developer who works with multiple coding agents from different providers (Claude Code + OpenAI Codex).

The core problem is that there is currently no way for Claude Code to receive live external events or messages from other agent engines (such as OpenAI’s fully open-source Codex App Server via JSON-RPC) inside the same active session.

This forces manual copy-paste workflows between separate terminals or tools, which breaks mid-execution context, loses conversation state, and completely prevents true bidirectional collaboration between heterogeneous agents.

It makes it extremely difficult to build complex multi-agent systems where different AIs need to work together in real time.

Proposed Solution

In the ideal experience, Claude Code’s MCP notification system would support (or easily allow third-party) bridges to other providers’ protocols like JSON-RPC. This would enable full bidirectional communication and mid-execution injection inside one single live session, so multiple agents can collaborate seamlessly without any manual intervention.

As a concrete proof-of-concept built within 24 hours of the Channels launch, I open-sourced a working bridge:
https://github.com/raysonmeng/agent-bridge

Live demo shows Claude Code and Codex literally greeting each other and co-authoring the bridge itself in the same session. This demonstrates the exact user experience we need.

Alternative Solutions

• Manual copy-paste between Claude Code and Codex terminals
• Running multiple separate sessions and syncing via files
• Custom file-watching scripts

All of these are inefficient, lose context, and break mid-execution flow.

Priority

Critical - Blocking my work

Feature Category

MCP server integration

Use Case Example

Example scenario:

1. I start a Claude Code session for a full-stack project (React frontend + Node.js backend).
2. I want Codex to optimize the backend logic while Claude handles the frontend UI in real time.
3. With this feature, Codex would inject its code changes and suggestions directly into the Claude session via MCP.
4. Claude would instantly review, comment, and respond — all inside the same live session.
5. No switching windows, no copy-paste, full context preserved. This would save hours on every multi-agent task.

Additional Context

• Repo + live demo (Claude and Codex greeting each other): https://github.com/raysonmeng/agent-bridge
• Screenshot of the demo (Claude & Codex collaborating in same session) attached below
• This bridge uses pure local MCP server + JSON-RPC, no cloud hop
• This could be the foundation for a universal "Agent-to-Agent MCP" protocol across providers

<img width="1389" height="642" alt="Image" src="https://github.com/user-attachments/assets/520756b8-dfc5-4511-bcb3-ecad2241db99" />
<img width="1389" height="642" alt="Image" src="https://github.com/user-attachments/assets/fea83ab6-98c8-402e-a0fe-8a8c60842b42" />
<img width="1389" height="642" alt="Image" src="https://github.com/user-attachments/assets/52ff75c3-0c26-4208-b488-652824047bcc" />
<img width="1389" height="642" alt="Image" src="https://github.com/user-attachments/assets/c2593a9a-84c0-4cc1-954e-3960f0113959" />