MCP servers

Codex can act as an MCP client. Configure servers in ~/.codex/config.toml, or manage them with the CLI:

Copycodex mcp add github -- npx -y @modelcontextprotocol/server-github
codex mcp list
codex mcp login github
codex mcp remove github

For a local process, use command and args. For a remote server, use url; authentication can use bearer_token_env_var. Server-specific environment variables belong under [mcp_servers.<name>.env].

Copy[mcp_servers.github]
command = "npx"
args = ["-y", "@modelcontextprotocol/server-github"]
 
[mcp_servers.github.env]
GITHUB_PERSONAL_ACCESS_TOKEN = "${GITHUB_TOKEN}"

Use codex mcp get <name> to inspect the effective configuration. Codex discovers the server's tools and makes them available to the agent; review permissions and tokens before enabling write-capable tools.