Append the instructions of the MCP servers to the system prompt

$ codex --version
codex-cli 0.53.0

What feature would you like to see?

Append the instructions of the MCP servers to the system prompt, or somewhere the LLM can see.

The behavior of Claude Code:

<img width="1524" height="576" alt="Image" src="https://github.com/user-attachments/assets/15d11e0e-a486-473d-9a27-510ef26c3bf5" />

MCP servers response the instructions from the "initialize" request:

<img width="1364" height="1154" alt="Image" src="https://github.com/user-attachments/assets/9aa8749f-57ae-49ea-8cde-3f8b465c05e8" />

This usage is also used by the official Github MCP server:

(from their blog)

https://github.com/github/github-mcp-server/blob/main/pkg/github/instructions.go#L10

Additional information

_No response_