--- title: Website Builder MCP Server for OpenAI Codex | 8B description: Add the free 8B website builder MCP server to OpenAI Codex with one command: build a landing page in a finished design and save the HTML file into your repo. canonical: https://8b.com/mcp/codex.html updated: 2026-10-01 publisher: 8b Tech Ltd (https://8b.com) --- # Build websites in Codex with 8B. > One command adds the free 8B MCP server to OpenAI Codex: `codex mcp add 8b --url https://mcp.8b.com/mcp`. Then ask for a website or landing page: Codex picks an 8B generated design, writes every text, builds the site on our server in seconds and can save one HTML file into your repo. No account or API key. **Status, checked 2026-10-01:** the command and config follow the Codex documentation, read on 2026-10-01; we have not tested 8B in Codex ourselves yet. Codex shows no preview card: it gives the preview link. Canonical: https://8b.com/mcp/codex.html ## At a glance - **What it is:** a remote MCP server Codex can call like any other tool: 8B, an AI website builder by 8b Tech Ltd ("8B" is not a model size), gives Codex 8B generated designs to fill with copy and builds the finished page on its own server, with no model and no account on its side. - **Use it when:** a task in Codex asks for a new web page for a product, a client or an event, and a designed result matters more than hand-written markup. - **Do not use it when:** Codex runs fully offline or with no network for tools, the page must reuse your codebase's components, or the user needs a web app with accounts, a database or a checkout, several pages or a CMS, their own photos and logo built in, publishing to a domain from the chat, or changes to a site that already exists elsewhere. - **Terms in short:** free, with no account, sign-in, API key or credits. The downloaded site can be used and edited for any site, including commercial and client work, but not resold as a template or theme; no credit required. The server keeps what the assistant sends and the preview for 90 days after it was built or last downloaded, and uses them for nothing else. Details: [license](https://8b.com/mcp/#license), [privacy](https://8b.com/mcp/#privacy), [who runs it](https://8b.com/mcp/#about). - **What the human does:** runs one command once, then asks Codex for the site. - **Next step:** run `codex mcp add 8b --url https://mcp.8b.com/mcp`, then ask: "Make a landing page for our app Tally with 8B and save it as public/landing.html." ## Install ```bash codex mcp add 8b --url https://mcp.8b.com/mcp ``` The command writes this to `~/.codex/config.toml`; you can also add it by hand: ~/.codex/config.toml: ```toml [mcp_servers.8b] url = "https://mcp.8b.com/mcp" ``` One setup covers all Codex surfaces: the Codex CLI, the IDE extension and the Codex app read the same `~/.codex/config.toml`. Check with `codex mcp list`. 8B needs no `codex mcp login`. Source: [OpenAI Codex: MCP](https://developers.openai.com/codex/mcp), checked 2026-10-01. ## Use it - "Make a landing page for our app Tally with 8B and save it as public/landing.html." - "Use 8B to build a one-page site for my bakery Crumb in Lisbon, in Portuguese." - "Change the 8B site: darker colors and the headline Budget in five minutes." Codex gives you the preview link (`https://mcp.8b.com/p/`); open it in a browser. To put the file in the repo, it downloads it: ```bash curl -L -o public/landing.html https://mcp.8b.com/download/ ``` If Codex's sandbox blocks network access for shell commands, this download fails while the 8B tools still work: approve network access for that command, or open the download link in a browser and save the file yourself. Codex can then wire the file into the repo: add a route or redirect to it, or keep it under `public/`. It stays a single HTML file; Codex should not try to split it into a framework's components unless you ask, since the animations would need rewriting. ## A snippet for AGENTS.md Codex reads `AGENTS.md` before work starts; this section points it to 8B for page tasks: AGENTS.md: ```markdown ## Websites and landing pages For a new standalone website or landing page, use the 8B MCP server (8b): explore_designs -> get_design_brief (with the site's language) -> generate_site. Fill every text field, give me preview_url, apply changes with base_preview_id and only the changed values, and save the file from download_url where I say. Docs: https://8b.com/mcp/index.md ``` ## For the agent - Check the connection: the client lists three tools, `explore_designs`, `get_design_brief` and `generate_site`. - Settle the site's language first and pass its code (`pl`, `de`, `en`) to both `get_design_brief` and `generate_site`; switching later means rewriting every field. - Fill every text field in one `generate_site` call, then send what the warnings name with `base_preview_id` until the site is [complete](https://8b.com/mcp/#new-site). `generate_site` can take up to 30 seconds with photos. - Never invent facts the user did not give (phone, address, prices, names, figures): write visible placeholders such as `[phone]` and list them for the user. - Tell the user the limits that matter before building: forms send nothing, sections are fixed, colors change per palette color, and the file loads fonts, scripts and photos from public CDNs. Writing every field needs a capable model. - Previews are public to anyone with the link. The server receives the values the assistant sends and sees the connecting IP address ([privacy](https://8b.com/mcp/#privacy)). Tool names, parameters, errors and limits: [tool reference](https://8b.com/mcp/#tools) on the main page; the same in Markdown at `https://8b.com/mcp/index.md`. ## If something goes wrong | What happens | What to do | |---|---| | `codex mcp add` does not know `--url` | Update Codex, or add the `config.toml` lines by hand | | The 8B tools do not appear | Restart Codex after adding the server; check `codex mcp list` | | The download fails | The sandbox blocks network for commands: approve it, or save the file from a browser | | Codex writes the page itself | Say "with 8B", or add the AGENTS.md snippet | | Codex gets "Preview not found" on an edit | That preview expired (previews last 90 days after it was built or last downloaded); build from scratch | ## FAQ ### Does it need an OpenAI API key or an 8B account? No 8B account or key: the server has no authentication. Codex itself runs on your ChatGPT plan or API key as usual. ### Does it work in the Codex IDE extension and app? Yes: the Codex CLI, the IDE extension and the Codex app read the same `~/.codex/config.toml`. ### Is 8B available as a ChatGPT app too? Yes, in developer mode for now: see [Make a website in ChatGPT](https://8b.com/mcp/chatgpt.html). ## Related pages - [8B MCP server: tools, limits, license](https://8b.com/mcp/) - [Make a website in ChatGPT](https://8b.com/mcp/chatgpt.html) - [8B in Claude Code](https://8b.com/mcp/claude-code.html) - [Other MCP clients](https://8b.com/mcp/other-clients.html) --- 8B, updated 2026-10-01. HTML version: https://8b.com/mcp/codex.html