ohos-playwright-mcp

MCP server for HarmonyOS / OpenHarmony ArkWeb (Chromium 132-based) — the ohos counterpart of @playwright/mcp.

Drives ArkWeb through playwright-core over the Chrome DevTools Protocol. Bootstrap (hdc connect → aa start → hdc fport → CDP endpoint) is delegated to ohos-playwright.

Why this exists

ArkWeb on HarmonyOS denies AF_UNIX socket creation in its sandbox, which breaks any tool that tries to launch Chrome the playwright way. connectOverCDP over a TCP-forwarded port works fine, and that's what this server uses end-to-end.

Install

npm i -g ohos-playwright-mcp ohos-playwright playwright-core

Node ≥ 24. hdc must be on PATH and an OpenHarmony / HarmonyOS device reachable.

MCP client config

{
  "mcpServers": {
    "ohos": {
      "command": "ohos-playwright-mcp"
    }
  }
}

If the peer deps live in a non-standard location, point at them explicitly:

{
  "mcpServers": {
    "ohos": {
      "command": "node",
      "args": ["/abs/path/to/server.mjs"],
      "env": {
        "ARKWEB_OHOS_PW_REGISTER": "/abs/path/to/ohos-playwright/dist/register.mjs",
        "ARKWEB_OHOS_PW_SETUP":    "/abs/path/to/ohos-playwright/dist/setup.mjs",
        "ARKWEB_PW_CORE":          "/abs/path/to/playwright-core/index.mjs"
      }
    }
  }
}

Other env vars:

• OHOS_PW_INFO_PATH — where the CDP endpoint cache lives (default: <tmpdir>/ohos-playwright-cdp.json).
• Any OHOS_PW_* vars consumed by ohos-playwright/setup (device serial, browser bundle name, port, etc.) — see that project's README.

Tools (61)

Navigation — navigate, navigate_back, navigate_forward, reload, wait, wait_for

Read-only — evaluate, get_text, get_html, screenshot, snapshot

Tabs / lifecycle — list_pages, select_page, tab_new, tab_close, close, resize

Input (selector-based) — click, hover, type, fill, fill_form, press_key, select_option, file_upload, drag

Input (raw mouse) — mouse_move_xy, mouse_click_xy, mouse_down, mouse_up, mouse_drag_xy, mouse_wheel

Diagnostics — console_messages, handle_dialog

Network — network_requests, network_request, network_state_set, route, route_list, unroute

Cookies — cookie_list, cookie_get, cookie_set, cookie_delete, cookie_clear

Storage — localstorage_list, localstorage_get, localstorage_set, localstorage_delete, localstorage_clear, sessionstorage_list, sessionstorage_get, sessionstorage_set, sessionstorage_delete, sessionstorage_clear, storage_state

Visualization — highlight, hide_highlight

Heavy — pdf_save (may not work on foreground ArkWeb), start_tracing, stop_tracing

Each tool's JSON schema is published via standard MCP tools/list.

ArkWeb-specific notes

• screenshot uses raw CDP Page.captureScreenshot to skip Playwright's font-wait, which hangs on some ArkWeb pages.
• snapshot calls Accessibility.getFullAXTree via a fresh CDP session because Playwright 1.x removed page.accessibility.
• tab_new uses the /json/new HTTP endpoint with PUT (ArkWeb rejects the playwright context.newPage() path).
• navigate_back / navigate_forward use waitUntil: 'commit' because ArkWeb doesn't re-fire load for cached history navigation.
• ArkWeb tabs can occasionally crash into arkweb-error://webdata/ under heavy CDP load. The server auto-recovers by spawning a blank tab.

License

MIT © 2026 social4hyq