I moved my MCP servers from Claude to Codex. Here's the cheat sheet

The primary challenge when moving "MCP servers" between Claude and Codex environments is a change in how configurations are stored. Claude Desktop and Cursor utilize JSON for these server configurations, whereas Codex requires them in TOML format, typically located in `~/.codex/config.toml` or within a trusted project. This means that merely transferring server definitions is insufficient; their configuration data must be converted.

For users managing a small number of "MCP servers," manual conversion of the configuration syntax is presented as feasible. However, for a larger quantity, a dedicated "MCP config converter" tool is provided. This converter operates as a paste-and-convert page within the user's browser, notably without uploading any data, and facilitates conversion between JSON and TOML formats.

The article, authored by the operator of a directory for ChatGPT and Codex plugins, focuses specifically on this configuration format change. It does not provide details on what "MCP servers" are, nor does it explain the broader functionalities of Claude Desktop, Cursor, or Codex beyond their respective configuration storage methods. The presented solution is narrowly focused on the technical step of configuration format conversion.