strapi-plugin-mcp-chat

AI chat inside the Strapi 5 admin that actually reads and edits your content — including fields nested in components and dynamic zones — through MCP. Comes with voice (speech-to-text / text-to-speech) and a side-by-side live preview of your frontend.

Ask in plain language ("change the homepage hero title to …") and the assistant finds the text across all content-types, edits it, and publishes — then reloads the preview on the very page you were looking at.

https://github.com/raulbalestra/strapi-plugin-mcp-chat

Features

• 🤖 AI chat in the admin — a floating widget on every screen + a full-page view. Runs an agent loop on the OpenAI Chat Completions API.
• ✏️ Edits real content via MCP + Document Service — buscar_texto finds a phrase across all content-types, single types, components and dynamic zones (recursive); editar_campo updates it (preserving the other components); publicar publishes.
• 📝 Draft-first by default — the AI edits drafts and does not publish unless you ask (or flip the Auto-publish toggle). Pair it with the preview's Draft / Live switch to review unpublished changes before they go to production. See Draft-first editing & previewing drafts.
• 🎙️ Voice — record a request (Whisper STT) and hear replies (OpenAI TTS).
• 👁️ Side-by-side preview panel — the plugin's own docked iframe that shrinks the admin and shows your frontend; reloads after each edit and stays on the same page + scroll position (with the optional preview bridge below). This is a custom panel, not Strapi's official Live Preview (which is a Growth/Enterprise feature) — it works on any plan, including Community, and complements the official Preview if you have it configured.
• 🖥️ Optional browser control — if a Playwright MCP server is reachable, the agent can drive a real browser to verify changes.
• 🧱 Frontend provisioning — upload your frontend (Next.js or TanStack Start) with a strapi.manifest.json; the plugin validates it, creates all content-types, seeds content and wires the preview. Never runs code from the upload — it acts only on the validated manifest.
• 🌍 Translate every page to any language — create locales and translate all localized content via Strapi 5's native i18n, with no length limits and no context blowups (see below).
• 🌐 Fully bilingual (PT / EN) — both the AI prompts/voice and the plugin's own admin pages, switchable with one click (the choice is shared across the chat and the menu pages).
• 🎓 Built-in onboarding tour — a first-run mini-course (re-openable any time via ❓ Tour) walks new users through chat, editing, live preview, provisioning and translation.

What makes MCP Chat unique

MCP Chat is built on Strapi 5's native MCP server and focuses on letting an assistant operate your content end-to-end — find text anywhere (including fields nested in components and dynamic zones), edit it as a draft, publish it, and translate it — while you watch the result in a live preview right next to the editor.

A few things that set it apart:

• 👁️ Docked, side-by-side live preview that follows the exact page you're editing and can show drafts before they're published — on any plan, including Community.
• 🧱 Frontend provisioning from a strapi.manifest.json (Next.js / TanStack Start): the plugin infers the content model, creates the content-types, seeds the data and wires the preview for you.
• 📝 Draft-first & safe: edits go to drafts and nothing is published until you say so.
• ✏️ Operates content in place: finds and edits text nested in components and dynamic zones, then publishes — not just generating text into a single field.
• 🎙️ Voice (speech-to-text + text-to-speech) and a bilingual UI/prompts (PT / EN).

It's a complement to the rest of Strapi's AI ecosystem, not a replacement — reach for it when you want the "chat that edits your content with a live preview" workflow.

Requirements

• Strapi >= 5.47.0 — required for the built-in native MCP server that this plugin consumes.
• An OpenAI API key (used server-side only).

Install

npm install strapi-plugin-mcp-chat
# or pull the latest unreleased code straight from GitHub:
# npm install github:raulbalestra/strapi-plugin-mcp-chat

Or just try the ready-to-run Launchpad demo (the plugin is vendored there).

1. Enable this plugin

config/plugins.ts (or .js):

export default () => ({
  'mcp-chat': {
    enabled: true,
  },
});

On register(), the plugin registers its content tools (mcp_chat_buscar_texto, mcp_chat_editar_campo, mcp_chat_publicar) into Strapi's native MCP server via strapi.ai.mcp.registerTool. The in-admin chat calls the same functions in-process — no admin token or HTTP round-trip needed for the chat to work.

2. Raise the body size limit + allow the preview iframe

The chat can send a screenshot of your screen (base64) in the request body, so the default ~100 kb limit must be raised. If you use the live preview, also allow the frontend origin to be framed. config/middlewares.ts:

export default [
  'strapi::logger',
  'strapi::errors',
  {
    name: 'strapi::security',
    config: {
      contentSecurityPolicy: {
        useDefaults: true,
        directives: {
          'frame-src': ["'self'", process.env.CLIENT_URL],
          'img-src': ["'self'", 'data:', 'blob:', 'market-assets.strapi.io'],
          'media-src': ["'self'", 'data:', 'blob:'],
          upgradeInsecureRequests: null,
        },
      },
    },
  },
  'strapi::cors',
  'strapi::poweredBy',
  'strapi::query',
  { name: 'strapi::body', config: { jsonLimit: '15mb', formLimit: '15mb', textLimit: '15mb' } },
  'strapi::session',
  'strapi::favicon',
  'strapi::public',
];

3. Environment variables

# Required — the chat and voice features fail without it.
OPENAI_API_KEY=sk-...

# Optional.
OPENAI_CHAT_MODEL=gpt-4o                       # default: gpt-4o
PLAYWRIGHT_MCP_URL=http://localhost:8931/mcp   # enables browser control
STRAPI_ADMIN_URL=http://localhost:1337/admin   # used by browser control
CLIENT_URL=http://localhost:3000               # frontend origin (for the preview iframe CSP)

The OpenAI key lives only in the server .env and is never exposed to the browser. The chat endpoints require an authenticated admin session.

4. (Optional) Expose the tools to external MCP clients

The plugin always registers its tools; if you also enable Strapi's native MCP server, those tools become available to external MCP clients (e.g. Cursor) at /mcp. In config/server.ts:

export default ({ env }) => ({
  // ...your existing server config
  mcp: { enabled: true }, // serves /mcp (Streamable HTTP, Admin-token authenticated)
});

External clients authenticate with an Admin token (Settings → Admin Tokens); the MCP session is scoped to that token's permissions. The in-admin chat does not need this — it's only for letting other AI clients use the same tools.

5. Rebuild & run

npm run build && npm run develop

The floating chat appears on every admin screen, and MCP Chat is added to the menu. Set your frontend URL once in the preview panel's address bar — it's remembered in localStorage.

Optional: live-preview bridge (stay on the page + keep scroll)

The preview iframe is cross-origin, so the admin can't see where you navigated inside it. Drop this tiny client component into your frontend and it will (a) report the current URL to the admin so reloads return to the same page, and (b) save/restore the scroll position per page. For Next.js, create components/preview-bridge.tsx:

'use client';
import { usePathname } from 'next/navigation';
import { useEffect } from 'react';

export function PreviewBridge() {
  const pathname = usePathname();
  useEffect(() => {
    if (typeof window === 'undefined' || window.self === window.top) return; // only inside an iframe
    const key = `preview-scroll:${pathname}`;
    try { window.parent.postMessage({ type: 'preview:location', href: window.location.href }, '*'); } catch {}
    const saved = sessionStorage.getItem(key);
    if (saved != null) {
      const y = parseInt(saved, 10) || 0;
      [0, 60, 180, 400, 800].forEach((t) => setTimeout(() => window.scrollTo(0, y), t));
    }
    const save = () => { try { sessionStorage.setItem(key, String(window.scrollY)); } catch {} };
    window.addEventListener('scroll', save, { passive: true });
    window.addEventListener('beforeunload', save);
    return () => { save(); window.removeEventListener('scroll', save); window.removeEventListener('beforeunload', save); };
  }, [pathname]);
  return null;
}

Then render <PreviewBridge /> once in your root layout. The same idea works in any framework — just post { type: 'preview:location', href: location.href } to window.parent.

Draft-first editing & previewing drafts

Strapi's Draft & Publish lets editors stage changes before they go live. MCP Chat respects that:

• The AI edits drafts, never auto-publishes. editar_campo always writes the draft version. By default the agent stops there and tells you it saved a draft — it only calls publicar when you explicitly ask ("publish this", "make it live") or when you turn Auto-publish ON in the chat toolbar. The setting is remembered (localStorage mcp-chat-autopublish, default off).
• Content-types without Draft & Publish are handled correctly. Draft & Publish is per content-type and off by default; publish() only exists when it's enabled (calling it otherwise throws, per the Strapi 5 docs). When a type has no Draft & Publish, the edit is the live value — so the plugin skips publishing (no error) and the assistant tells you the change is already live.
• Preview the draft before publishing. The preview panel has a 📝 Draft / 🌐 Live toggle. In Draft it reloads the frontend with ?preview=1; provisioned frontends read that flag and fetch status=draft from the Content API, so you see unpublished changes exactly as they'll look — without publishing. Flip to Live to compare with what's currently public.

Draft preview contract (for custom / non-provisioned frontends): when the iframe URL carries ?preview=1 (or ?status=draft), fetch Strapi with status: 'draft' and an API token that can read drafts (STRAPI_API_TOKEN). Provisioned frontends get this wired automatically via the generated strapi-client data module. Note: draft fetching keys off the URL on the client, so with SSR the first server render may show published content until hydration — fine for preview, but don't rely on it for production rendering.

How it works

register() ─► strapi.ai.mcp.registerTool ─► native MCP server (/mcp)
                 mcp_chat_buscar_texto / _editar_campo / _publicar
                 (also available to external MCP clients, e.g. Cursor)

Admin (floating chat / full page)
  └─ POST /mcp-chat/message ─► chat service (agent loop, OpenAI)
        ├─ content tools  ─► same functions, called IN-PROCESS (no HTTP, no token)
        │     buscar_texto  → deep, recursive search (components + dynamic zones), returns a `path`
        │     editar_campo  → edits the field at that `path`, re-saving the whole top attribute
        │     publicar      → publishes the entry
        └─ (optional) browser_* ─► Playwright MCP
  └─ POST /mcp-chat/stt · /mcp-chat/tts ─► Whisper / OpenAI TTS

The plugin extends Strapi's native MCP server: in register() it calls strapi.ai.mcp.registerTool to add its deep search/edit/publish tools, so any MCP client gets them. The same functions are shared with the in-admin chat, which calls them in-process — so the chat needs no admin token and no HTTP round-trip.

buscar_texto returns matches with a path like ["dynamic_zone", 0, "heading"]. editar_campo takes that same path, deep-fetches the entry, mutates the leaf, and writes the whole top-level attribute back — keeping component ids (so they're updated in place, not recreated) and reducing media/relations to ids.

Note: blocks-type rich text is intentionally not edited (it's structured JSON); string / text / richtext fields at any depth are.

Frontend provisioning

Bring a "blessed-stack" frontend (Next.js or TanStack Start) carrying a strapi.manifest.json. The plugin never executes code from the upload — it reads and validates the manifest (Zod) and, from it, provisions the backend:

upload  →  validate manifest  →  extract to ../<frontend>
        →  generate src/api/**/schema.json (additive)  →  Strapi restarts
        →  seed content (Document Service)  →  wire .env + types + preview

Safety rails: schema generation runs only in develop (a Content-Type Builder limitation); generation is additive (never drops/alters an existing type); the frontend always lands in a sibling folder, never inside Strapi's src/. Ready-to-use starters live in starters/. The manifest can also be inferred from the frontend code (e.g. Figma/Lovable exports).

Translation (i18n)

Ask the chat to translate and it creates the locales and translates every localized field, using Strapi 5's native i18n — without the two failure modes of typical translation plugins:

• Long text doesn't overflow — each value is split per paragraph (a giant paragraph falls back to sentences) under a token budget, translated chunk by chunk and reassembled in order, so a field of any size works.
• Many locales don't blow up — each locale is an independent, resumable pass (idempotent locale creation + per-locale upsert), so 10, 30, 50 languages run in sequence without accumulating context.

Tools (in the chat and via the native MCP server): criar_locale, listar_locales, traduzir, habilitar_i18n, plus a locale option on editar_campo/publicar. In a manifest, mark localized: true on the content-type and the fields to translate; the generator emits pluginOptions.i18n.localized at both the content-type and attribute level. Validated end-to-end against a real Strapi 5 (14 locales, long multi-chunk text and translation inside repeatable components).

Strapi 5 conventions

The plugin follows the documented Strapi 5 plugin APIs:

• Server — the entry (server/src/index.ts) exports the documented shape (register / bootstrap / destroy / config / controllers / services / routes). Routes are declared with type: 'admin', so the chat/STT/TTS endpoints require an authenticated admin session.
• MCP — tools are defined as pure objects with a local typed defineTool helper (server/src/mcp/define.ts) and registered from an array via strapi.ai.mcp.registerTool during register(), using z from @strapi/utils for the schemas and auth.policies (content-manager read/update/publish) for RBAC. The defineTool/defineResource/definePrompt identity functions infer each handler's args from its input schema (no any) and keep the definitions side-effect-free — mirroring the direction of Strapi's PR #26603 (ai.mcp.defineTool + the import { ai } from "@strapi/strapi" namespace). When that API ships stable, migrating is a one-line import swap; until then the plugin stays on the released registerTool so it runs on any Strapi ≥ 5.47 (no experimental build required).
• Admin — register() uses only documented APIs (app.addMenuLink, app.registerPlugin).

One intentional deviation: the global floating chat is mounted via its own React root in bootstrap(). Strapi's documented injection zones are Content-Manager-specific, and there is no official zone for an admin-wide overlay — so this is the only way to render a widget on every screen. It's isolated and idempotent (guarded by an element id) and contained to that single spot.

Security

• The OpenAI key is read from the server environment only.
• Chat / STT / TTS routes are admin-authenticated.
• The registered MCP tools enforce auth.policies (content-manager read/update/publish). When exposed to external MCP clients, the session is scoped to the connecting Admin token's permissions — scope the token to only what those clients should change.
• The agent can edit and publish content — give the plugin only to trusted editors.

Reliability — never degrades or breaks the host Strapi

This plugin is built to be a good citizen: installing it must never slow down or take down the host app. Concrete guarantees:

• Can't crash boot. register() degrades gracefully if the native MCP server / i18n / OpenAI key are absent (logs a warning, disables the feature). MCP tools register inside a per-tool try/catch, so a single bad tool can never abort the others or the boot. destroy() is best-effort.
• Can't blank the admin. The global overlay (floating chat + preview) mounts inside a React error boundary in its own root, after an SSR/double-mount guard; any render error just hides the overlay, leaving the Strapi admin fully intact. Lingering preview layout styles are reset on load, and screen/mic capture is stopped on unmount.
• Provisioning is fail-safe. Generated schemas are validated before any file is written (kind/attributes/known types/relation targets) and writes are all-or-nothing — a malformed manifest can never leave Strapi with a broken, unbootable schema. Generation stays additive (never touches existing types), dev-only, with hardened zip-slip protection.
• Won't become a bottleneck. Every outbound call (OpenAI, MCP) has a timeout so a slow upstream can't hold a request open; recursive content search has depth caps and a result cap; tool outputs are size-capped before going back to the model.

License

MIT © Raul Balestra