Use MCP servers in Codex with Toolport
Toolport is a free, open source local MCP gateway. Add your servers to Toolport once, flip the Codex toggle, and Codex gets all of them through a single gateway entry, with lazy discovery loading 3 meta-tools instead of every server's full tool list.
Setup
- Download Toolport for Windows, macOS or Linux, and add your MCP servers to it (or import the ones your clients already have; secrets go to your OS keychain).
- Open the Clients tab and toggle Codex on. Toolport writes its gateway entry into Codex's config, next to anything already there.
- Restart or reload Codex. Your full server set is available through Toolport, and any server you add later shows up without touching Codex again.
Where Codex keeps its MCP config
- All platforms
~/.codex/config.toml
TOML with [mcp_servers.<name>] tables. The CLI and desktop app read the same file.
Why a gateway instead of Codex's own server list?
- One setup, every client. The same servers work in Codex and every other client on your machine; add a server once and they all get it.
- Up to 91% fewer tool tokens. Instead of every server dumping its tool list into context, the agent loads 3 meta-tools and searches on demand (measured).
- Secrets in the OS keychain. API keys are injected at runtime and never sit in Codex's config file.
- Watched by default. Rug-pull and tool-poisoning detection on every tool, plus per-tool governance and a destructive-tool kill switch. How the security works.