gsc-ga4-mcp

gsc-ga4-mcp

A small local MCP server that gives Claude Code read-only access to Google Search Console and GA4, plus a few tools that cross the two datasets.

The problem

SEO work in an AI assistant usually means exporting CSVs from Search Console, exporting more CSVs from GA4, pasting both into a chat, and repeating that every time you want a fresh number. The two datasets also never line up on their own: Search Console knows impressions, clicks and CTR; GA4 knows sessions, engagement and conversions. Answering "which pages get traffic but waste it" means joining them by URL by hand.

Google publishes an official MCP server for Analytics, but it does not cover Search Console. Community Search Console servers exist, but if the data belongs to clients, running a small wrapper you can read end to end beats trusting someone else's.

This server calls the official Google APIs directly, with read-only scopes, from your own machine.

What it does

Twenty MCP tools over stdio.

Search Console

GA4

Combined analysis

Config

project_mappings and project_lookup read a local file that maps a project or client name to its GSC property and GA4 property, so you can say "cross GSC and GA4 for example.com" instead of remembering properties/123456789.

Stack

Node.js + TypeScript. @modelcontextprotocol/sdk for the server, google-auth-library for auth, zod for tool schemas. No database, no hosted backend, no telemetry — the process runs locally and Claude Code launches it over stdio.

Scopes are read-only and that is the whole permission surface:

• https://www.googleapis.com/auth/webmasters.readonly
• https://www.googleapis.com/auth/analytics.readonly

Credentials live outside the repo, by default in ~/.config/gsc-ga4-mcp/.

Setup

1. Install

git clone https://github.com/YOUR_USER/gsc-ga4-mcp.git
cd gsc-ga4-mcp
npm install
npm run build
mkdir -p ~/.config/gsc-ga4-mcp

2. Enable the APIs

In Google Cloud Console, create or pick a project, then enable:

• Google Search Console API
• Google Analytics Data API
• Google Analytics Admin API

3. Create OAuth credentials

Under APIs & Services → OAuth consent screen, configure the consent screen. Use External if the properties you manage are not all in one Google Workspace, and add your own email as a test user while the app is in testing.

Under APIs & Services → Credentials, create an OAuth client ID of type Desktop app, download the JSON, and save it as ~/.config/gsc-ga4-mcp/oauth-client.json.

For client work where you want permissions isolated per account, use a service account instead and add its email to each GSC and GA4 property with read access. Set GOOGLE_AUTH_MODE=service_account and point GOOGLE_SERVICE_ACCOUNT_KEY_FILE at the key.

4. Configure

cp .env.example .env
cp projects.example.json ~/.config/gsc-ga4-mcp/projects.json

Paths in .env must be absolute — ~ is not expanded.

GOOGLE_AUTH_MODE=oauth
GOOGLE_OAUTH_CREDENTIALS_FILE=/Users/YOUR_USER/.config/gsc-ga4-mcp/oauth-client.json
GOOGLE_TOKEN_PATH=/Users/YOUR_USER/.config/gsc-ga4-mcp/token.json
GOOGLE_OAUTH_REDIRECT_URI=http://127.0.0.1:3000/oauth2callback
PROJECTS_CONFIG=/Users/YOUR_USER/.config/gsc-ga4-mcp/projects.json
MCP_DEFAULT_GSC_SITE=sc-domain:example.com
MCP_DEFAULT_GA4_PROPERTY=properties/123456789
MAX_ROWS=25000

Project mappings (projects.json):

{
  "projects": [
    {
      "name": "My Site",
      "client": "Internal",
      "domain": "example.com",
      "gscSiteUrl": "sc-domain:example.com",
      "ga4Property": "properties/123456789",
      "notes": "Replace with the real GA4 property ID."
    }
  ]
}

5. Authorise

npm run auth

The script starts a loopback listener on 127.0.0.1:3000 and prints a Google URL. Open it, approve the read-only scopes, and the token is written to GOOGLE_TOKEN_PATH.

6. Register with Claude Code

claude mcp add google-seo -- node /ABSOLUTE/PATH/TO/gsc-ga4-mcp/dist/index.js
claude mcp list

Or check a .mcp.json into the project where you want the tools (see .mcp.example.json):

{
  "mcpServers": {
    "google-seo": {
      "command": "node",
      "args": ["/ABSOLUTE/PATH/TO/gsc-ga4-mcp/dist/index.js"],
      "env": {
        "GOOGLE_AUTH_MODE": "oauth",
        "GOOGLE_OAUTH_CREDENTIALS_FILE": "/Users/YOUR_USER/.config/gsc-ga4-mcp/oauth-client.json",
        "GOOGLE_TOKEN_PATH": "/Users/YOUR_USER/.config/gsc-ga4-mcp/token.json",
        "PROJECTS_CONFIG": "/Users/YOUR_USER/.config/gsc-ga4-mcp/projects.json",
        "MCP_DEFAULT_GSC_SITE": "sc-domain:example.com",
        "MCP_DEFAULT_GA4_PROPERTY": "properties/123456789"
      }
    }
  }
}

Use the CLI registration when you would rather keep paths and property defaults out of a repo.

Usage with Claude Code

Ask in plain language; Claude picks the tools.

Use gsc_list_sites and ga4_list_properties. Give me a table of the GSC sites
and GA4 properties I can reach.

Analyse organic traffic for sc-domain:example.com over the last 90 days using
gsc_top_queries and gsc_top_pages.

Cross GSC and GA4 for example.com over the last 90 days. Find pages with high
impressions and low CTR, and rank the opportunities by likely impact.

Run seo_opportunity_report and group the output into quick wins, pages that
need a rewrite, and pages that miss search intent.

Inspect https://www.example.com/page/ with gsc_url_inspection and tell me
whether Google has it indexed.

Operating notes

• Keep .env, token.json, projects.json and any service-account key out of version control. The shipped .gitignore already covers them.
• Client analytics data is confidential. Do not paste full outputs into tools the client has not approved.
• Revoke the token or the service account when an engagement ends.
• MAX_ROWS caps response size. Lower it if replies get unwieldy.

Troubleshooting

• Claude Code does not see the tools. Run claude mcp list, then /mcp inside Claude Code.
• OAuth token errors. Re-run npm run auth and confirm GOOGLE_TOKEN_PATH is an absolute path.
• access_denied. Add your email as a test user on the OAuth consent screen while the app is in testing.
• A domain is missing from GSC. The credentials need access to that exact property — sc-domain:example.com and https://www.example.com/ are different properties.
• A GA4 property is missing. The user or service account needs at least Viewer on the account or property.
• gsc_url_inspection fails. inspectionUrl must sit inside siteUrl, and URL-prefix properties must end with /.
• Invalid GA4 metrics. Use the official GA4 dimension and metric names; runReport rejects anything else.

References

• Claude Code MCP documentation
• Model Context Protocol
• Search Console API
• GA4 Data API
• Google Analytics Admin API
• Google OAuth scopes

Licence

MIT. See LICENSE.