Quick Start: Codex¶

Use the same local stdio command in your Codex MCP server configuration:

{
  "mcpServers": {
    "mcp-v8": {
      "command": "mcp-v8",
      "args": ["--directory-path", "/tmp/mcp-v8-heaps"]
    }
  }
}

If you want a fresh isolate for every run:

{
  "mcpServers": {
    "mcp-v8": {
      "command": "mcp-v8",
      "args": ["--stateless"]
    }
  }
}

Once connected, ask Codex to run a short JavaScript snippet and confirm the output.

If you want Codex to connect to a running Streamable HTTP MCP endpoint instead of launching mcp-v8 locally, configure it in config.toml:

[mcp_servers.mcp-v8]
url = "http://localhost:3000/mcp"

For the server-side model, see Connect as an MCP Server.