Cws

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MCP server for Chrome Web Store extension management. Upload, publish, and manage Chrome extensions directly from Claude Code or any MCP client.

When to Use

Use this MCP when you need to:

• "Upload a new version of my Chrome extension" — build your ZIP and use the upload tool to push it as a draft
• "Publish my extension to the Chrome Web Store" — use publish to submit for review and go live
• "Check the review status of my extension" — use status to see review state, version, and deploy percentage
• "Update my extension's metadata (description, screenshots)" — use update-metadata-ui to change store listing details
• "Cancel a pending submission" — use cancel to withdraw a submission under review
• "Set up staged rollout for my extension" — use publish with staged rollout, then deploy-percentage to ramp up

Tools

Tool	Description
upload	Upload a ZIP file to Chrome Web Store (update existing item draft)
publish	Publish an extension with optional staged rollout, publish type, and skip-review
status	Fetch the current status including review state, deploy percentage, and version
cancel	Cancel a pending submission
deploy-percentage	Set staged rollout percentage (0-100, must exceed current target)
get	Read draft/published listing metadata (v1.1 API, deprecated Oct 2026)
update-metadata	Update listing metadata via v1.1 API (deprecated Oct 2026)
update-metadata-ui	Update listing metadata via dashboard UI automation (Playwright)

API Coverage

This MCP server covers all Chrome Web Store API v2 endpoints:

v2 Endpoint	MCP Tool
media.upload	upload
publishers.items.publish	publish
publishers.items.fetchStatus	status
publishers.items.cancelSubmission	cancel
publishers.items.setPublishedDeployPercentage	deploy-percentage

Additionally, v1.1 API endpoints are available for metadata operations (get, update-metadata), with dashboard UI automation (update-metadata-ui) as the recommended alternative since v1 is deprecated.

Setup

1. Create OAuth2 Credentials

1. Go to Google Cloud Console
2. Create a project (or select existing)
3. Enable Chrome Web Store API
4. Create OAuth2 credentials (Desktop app type)
5. Note your Client ID and Client Secret

2. Get Refresh Token

# Open in browser to get authorization code
open "https://accounts.google.com/o/oauth2/auth?response_type=code&scope=https://www.googleapis.com/auth/chromewebstore&client_id=YOUR_CLIENT_ID&redirect_uri=urn:ietf:wg:oauth:2.0:oob"

# Exchange code for refresh token
curl -X POST https://oauth2.googleapis.com/token \
  -d "client_id=YOUR_CLIENT_ID" \
  -d "client_secret=YOUR_CLIENT_SECRET" \
  -d "code=YOUR_AUTH_CODE" \
  -d "grant_type=authorization_code" \
  -d "redirect_uri=urn:ietf:wg:oauth:2.0:oob"

3. Configure MCP

Add to your Claude Code MCP settings (~/.claude/settings.local.json):

{
  "mcpServers": {
    "cws-mcp": {
      "command": "node",
      "args": ["/path/to/cws-mcp/dist/index.js"],
      "env": {
        "CWS_CLIENT_ID": "xxxxx.apps.googleusercontent.com",
        "CWS_CLIENT_SECRET": "GOCSPX-xxxxx",
        "CWS_REFRESH_TOKEN": "1//xxxxx",
        "CWS_PUBLISHER_ID": "me",
        "CWS_ITEM_ID": "your-extension-id"
      }
    }
  }
}

Or install globally via npm:

{
  "mcpServers": {
    "cws-mcp": {
      "command": "npx",
      "args": ["-y", "cws-mcp"],
      "env": { ... }
    }
  }
}

Environment Variables

Variable	Required	Description
CWS_CLIENT_ID	Yes	Google OAuth2 Client ID
CWS_CLIENT_SECRET	Yes	Google OAuth2 Client Secret
CWS_REFRESH_TOKEN	Yes	OAuth2 Refresh Token
CWS_PUBLISHER_ID	No	Publisher ID (default: me)
CWS_ITEM_ID	No	Default extension item ID
CWS_DASHBOARD_PROFILE_DIR	No	Browser profile path for UI automation (default: ~/.cws-mcp-profile)

Usage Examples

Check extension status

Use the cws-mcp status tool

Upload and publish

1. Use cws-mcp upload with zipPath="/path/to/extension.zip"
2. Use cws-mcp publish

Publish with staged rollout

Use cws-mcp publish with:
- publishType="STAGED_PUBLISH"
- deployPercentage=10

Publish with skip-review

Use cws-mcp publish with skipReview=true

Update listing title/description without publishing

Use cws-mcp update-metadata with:
- title="Pexus"
- summary="Official wallet for Plumise"
- description="..."
- category="productivity"
- defaultLocale="en"

Update advanced metadata fields

Use cws-mcp update-metadata with metadata={
  "homepageUrl": "https://plumise.com",
  "supportUrl": "https://plug.plumise.com/docs"
}

When API metadata updates don't reflect

Use cws-mcp update-metadata-ui with:
- title
- summary
- description
- category
- homepageUrl
- supportUrl

Notes:

• This tool automates the Chrome Web Store dashboard UI.
• First run with headless=false if login is required.
• Browser profile path defaults to ~/.cws-mcp-profile (override with CWS_DASHBOARD_PROFILE_DIR).

Staged rollout

1. Use cws-mcp publish
2. Use cws-mcp deploy-percentage with percentage=10
3. Use cws-mcp deploy-percentage with percentage=50
4. Use cws-mcp deploy-percentage with percentage=100

Note: deploy-percentage is only available for extensions with 10,000+ seven-day active users. The new percentage must always be higher than the current target.

V1 API Deprecation

The get and update-metadata tools use the Chrome Web Store v1.1 API, which is deprecated and will be removed after October 15, 2026. The v2 API does not provide metadata read/write endpoints, so these tools remain available as a bridge. Use update-metadata-ui (Playwright dashboard automation) as the long-term alternative.

License

MIT