Documentation inconsistency for config + MCP startup silently fails #4531
Description
What version of Codex is running?
codex-cli 0.42.0
Which model were you using?
gpt-5
What platform is your computer?
Darwin 24.6.0 arm64 arm
What steps can reproduce the bug?
Run codex --help and you will see that the documentation says that config overrides should be in JSON format.
If you look at this section of the README on Github on the other hand, it says you should use TOML format.
I tried using JSON to configure and instantiate an MCP server at run time. Start up of the server failed silently, which is perhaps the more worrying bug.
What is the expected behavior?
No response
What do you see instead?
No response
Additional information
No response