AI Plugin Index
Host Codex
Verified · npm:@metaharnessMCP server by ruvnet · updated · ★ 709 · 590 downloads a week
OpenAI Codex CLI host adapter for agent-harness-generator (MCP via ~/.codex/config.toml) Host Codex is published by npm:@metaharness from its verified domain in the official MCP Registry.
Last commit in the past day
MIT: permissive, fine for commercial use
Clear description, published package or server URL, 709 stars, original repository
Not checked yet. What we check
Install Host Codex
Built from the published package, never by AIclaude mcp add host-codex -- npx -y @metaharness/host-codexRun in your terminal. Add --scope user to use it in every project.
{
"mcpServers": {
"host-codex": {
"command": "npx",
"args": [
"-y",
"@metaharness/host-codex"
]
}
}
}Settings, Developer, Edit config. Paste into claude_desktop_config.json and restart.
{
"mcpServers": {
"host-codex": {
"command": "npx",
"args": [
"-y",
"@metaharness/host-codex"
]
}
}
}Add to ~/.cursor/mcp.json (all projects) or .cursor/mcp.json (this project).
{
"servers": {
"host-codex": {
"command": "npx",
"args": [
"-y",
"@metaharness/host-codex"
]
}
}
}Add to .vscode/mcp.json. VS Code uses "servers", not "mcpServers".
codex mcp add host-codex -- npx -y @metaharness/host-codex{
"mcpServers": {
"host-codex": {
"command": "npx",
"args": [
"-y",
"@metaharness/host-codex"
]
}
}
}Add to ~/.gemini/config/mcp_config.json (all projects) or .agents/mcp_config.json (this project).
gemini mcp add host-codex npx -y @metaharness/host-codexGemini CLI was replaced by Antigravity CLI in June 2026 and remains only for enterprise licences and paid API keys.
MCP servers run with your permissions and can read what you give them access to. Some need an API key: check the README and add it under env in the host-codex block.
Alternatives to Host Codex
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Host Codex: common questions
How do I install Host Codex?
In Claude Code run claude mcp add host-codex -- npx -y @metaharness/host-codex. For Claude Desktop, Cursor and VS Code, paste the config shown above and restart. See the install guides.
Is Host Codex the official server?
Host Codex is published by npm:@metaharness from its verified domain in the official MCP Registry.
Is Host Codex free?
The code is published under the MIT licence. The service it connects to may have its own pricing.
Is Host Codex safe to use?
It scores 86 of 100. Grades: maintenance A, licence A, quality A. The security check has not run for it yet. Review the code before you install. How grades work.
What are alternatives to Host Codex?
Similar MCP servers: Harness, MCP Registry Server, ref-tools-ref-tools-mcp, Microsoft Learn MCP.
Does Host Codex work with ChatGPT?
Not directly. It runs locally, and ChatGPT only connects to remote servers with a URL. Use it in Claude Code, Claude Desktop, Cursor, VS Code or Codex.