Claude Chrome

Claude-in-Chrome on steroids: MV3 extension + local hub daemon + MCP server. Full plan in PLAN.md.

Build

npm install
npm run build

Install the extension

1. Open chrome://extensions, enable Developer mode.
2. "Load unpacked" → select the extension/ folder.
3. The toolbar badge shows ● (green) when connected to the hub.

Register the MCP server

Claude Code (CLI):

claude mcp add claude-chrome -- node /Users/edem/Personal/claude-chrome/daemon/dist/index.js

Claude Desktop (~/Library/Application Support/Claude/claude_desktop_config.json):

{
  "mcpServers": {
    "claude-chrome": {
      "command": "node",
      "args": ["/Users/edem/Personal/claude-chrome/daemon/dist/index.js"]
    }
  }
}

The MCP server auto-spawns the hub (ws://127.0.0.1:48333) if it isn't running. Start it manually with npm run hub to watch logs.

Tools

Tool	What
browser_navigate	Open URL in the active (or new) tab, wait for load
browser_outline	Semantic page outline with r<N> refs (shadow DOM + same-origin iframes)
browser_click / browser_type	Act on ref / css / text match; trusted CDP input. Refuses hidden/covered/disabled targets (pass force) — surfaces bad page state instead of clicking into the void
browser_check	Visual/layout/animation audit: still-moving elements, horizontal overflow, broken images, covered/off-screen/tiny targets, unsettled animations
browser_select	Pick <select> option by value or label (fires input+change)
browser_hover / browser_scroll / browser_key / browser_wait	Mouse-over, wheel scroll, key combos ("ctrl+a", "Escape"), settle wait
browser_text	Plain page text (main content when detectable)
browser_screenshot	JPEG of the visible viewport
browser_js	Evaluate JS in the page (awaits promises)
browser_network / browser_console	Per-tab ring buffers; failed_only / errors_only filters
browser_tabs / browser_tab_new / browser_tab_close / browser_tab_focus	Tab management
browser_resize	Resize the window
do	Plain-text intent → matching saved flow → deterministic replay + smoke report
flow_save	Snapshot the last N journaled actions as a named flow
flow_run / flow_list	Replay / enumerate saved flows
journal	Inspect recent replayable actions before saving
secrets_list	Names of credentials available for login flows

Flows persist in ~/.claude-chrome/flows.json.

Login flows (secrets)

Login pages don't break the run. Put credentials in ~/.claude-chrome/secrets.json (chmod 600) — you own this file; the values never pass through the chat, the journal, saved flows, or logs:

{ "crm_user": "[email protected]", "crm_password": "…" }

Then a login step is browser_type secret="crm_password". The hub swaps the name for the value only on the wire to the browser; flow_save records the name, so a saved login flow re-resolves the current value on every replay. secrets_list shows the names.