Chrome Enterprise Premium MCP Server

[!NOTE] This is an officially supported Google product, but it is currently in an early stage of development. It is intended as a working example of how to build an MCP server that wraps Google Cloud and Workspace APIs and does not yet support the full range of features.

A Model Context Protocol (MCP) server for Chrome Enterprise Premium (CEP). CEP extends Chrome's built-in security with Data Loss Prevention (DLP), real-time threat protection (phishing and malware scanning), and Context-Aware Access controls. This server exposes CEP's DLP rules, content detectors, connector policies, browser telemetry, and license management as MCP tools — letting any MCP-compatible AI agent inspect and configure a Chrome Enterprise environment.

The codebase also serves as a worked example of wrapping Google Workspace and Cloud APIs in an MCP server: client abstraction with test doubles, offline CEL validation, retry logic, structured tool output, and an evaluation harness.

Important security consideration: Indirect Prompt Injection Risk

When exposing any language model to untrusted data, there's a risk of an indirect prompt injection attack. Agentic tools like Gemini CLI, connected to MCP servers, have access to a wide array of tools and APIs.

This MCP server grants the agent the ability to read, modify, and delete your Google Account data, as well as other data shared with you.

Never use this with untrusted tools
Never include untrusted inputs into the model context. This includes asking Gemini CLI to process mail, documents, or other resources from unverified sources.
Untrusted inputs may contain hidden instructions that could hijack your CLI session. Attackers can then leverage this to modify, steal, or destroy your data.
Always carefully review actions taken by Gemini CLI on your behalf to ensure they are correct and align with your intentions.

Quick Start

git clone <repo-url>
cd cmcp
npm install

1. Authenticate with Google Cloud

Install the Google Cloud CLI if you don't have it, then create Application Default Credentials (ADC) with the scopes needed by each API:

gcloud auth application-default login \
  --scopes="https://www.googleapis.com/auth/chrome.management.policy,https://www.googleapis.com/auth/chrome.management.reports.readonly,https://www.googleapis.com/auth/chrome.management.profiles.readonly,https://www.googleapis.com/auth/admin.reports.audit.readonly,https://www.googleapis.com/auth/admin.directory.orgunit.readonly,https://www.googleapis.com/auth/admin.directory.customer.readonly,https://www.googleapis.com/auth/cloud-identity.policies,https://www.googleapis.com/auth/apps.licensing,https://www.googleapis.com/auth/cloud-platform"

These scopes map to the underlying APIs:

Scope	API	Used for
`chrome.management.policy`	Chrome Policy	Reading/writing connector policies, extension install policies
`chrome.management.reports.readonly`	Chrome Management	Browser version counts, customer profiles
`chrome.management.profiles.readonly`	Chrome Management	Managed browser profiles
`admin.reports.audit.readonly`	Admin SDK Reports	Chrome activity logs
`admin.directory.orgunit.readonly`	Admin SDK Directory	Organizational unit hierarchy
`admin.directory.customer.readonly`	Admin SDK Directory	Customer ID resolution
`cloud-identity.policies`	Cloud Identity	DLP rules and content detectors (CRUD)
`apps.licensing`	Enterprise License Manager	CEP subscription and per-user license checks
`cloud-platform`	Service Usage	Checking and enabling required APIs

Then set a quota project (identifies which GCP project's API enablement and quotas to use):

gcloud auth application-default set-quota-project YOUR_PROJECT_ID

Scopes must be provided at login time. You cannot add scopes to existing ADC credentials. If you get "insufficient scopes" errors, delete ~/.config/gcloud/application_default_credentials.json and re-run the login command above.

No per-call charges. These APIs are included with your Google Workspace / Chrome Enterprise Premium license. The quota project is for API enablement and rate limiting, not billing. If you skip setting it, you'll see a "quota project not set" error on the first API call.

2. Enable Required APIs

These APIs must be enabled on your GCP project:

gcloud services enable \
  admin.googleapis.com \
  chromemanagement.googleapis.com \
  chromepolicy.googleapis.com \
  cloudidentity.googleapis.com \
  licensing.googleapis.com \
  serviceusage.googleapis.com

Or enable them from the API Library in Cloud Console.

Propagation delay: Newly enabled APIs can take 1–5 minutes to become available. The server handles this automatically by retrying PERMISSION_DENIED errors with exponential backoff. If you see retry messages on first run, wait — don't restart.

3. Connect Your MCP Client

The server uses stdio transport — your MCP client launches it as a child process. Add the config snippet for your client:

Claude Desktop

Edit ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows):

{
  "mcpServers": {
    "chrome-enterprise": {
      "command": "node",
      "args": ["/absolute/path/to/cmcp/mcp-server.js"],
      "env": { "GCP_STDIO": "true" }
    }
  }
}

Claude Code

Add to .mcp.json in your project root:

{
  "mcpServers": {
    "chrome-enterprise": {
      "command": "node",
      "args": ["/absolute/path/to/cmcp/mcp-server.js"],
      "env": { "GCP_STDIO": "true" }
    }
  }
}

VS Code

Add to .vscode/mcp.json:

{
  "servers": {
    "chrome-enterprise": {
      "command": "node",
      "args": ["/absolute/path/to/cmcp/mcp-server.js"],
      "env": { "GCP_STDIO": "true" }
    }
  }
}

Gemini CLI

Add to ~/.gemini/settings.json:

{
  "mcpServers": {
    "chrome-enterprise": {
      "command": "node",
      "args": ["/absolute/path/to/cmcp/mcp-server.js"],
      "env": { "GCP_STDIO": "true" }
    }
  }
}

Replace /absolute/path/to/cmcp/ with the actual path where you cloned the repo. Relative paths may not resolve correctly depending on the client.

4. Verify

Restart your MCP client, then ask:

"What Chrome Enterprise Premium tools do you have access to?"

You should see the agent discover and list the available tools. If tools don't appear, see Troubleshooting.

Configuration (`.env`)

The server loads a .env file from the project root on startup if one exists. Copy the example to get started:

cp .env.example .env

See .env.example for all available variables with inline documentation on how to obtain each value. At minimum, you'll want to set GOOGLE_CLOUD_QUOTA_PROJECT to avoid repeated --set-quota-project commands.

Prerequisites

Requirement	Details
Node.js	>= 18.0.0 (`node --version` to check)
Google Cloud CLI	`gcloud` installed and on your PATH (`gcloud --version` to check)
Google Workspace	Any edition, plus a Chrome Enterprise Premium license (60-day free trial available)
Admin role	Google Workspace Super Admin, or a delegated admin with Chrome Management and DLP permissions
GCP project	Linked to your Workspace domain, with required APIs enabled

GCP IAM is not enough. Chrome Management and Admin SDK APIs require a Google Workspace admin role in addition to GCP IAM roles. The user must hold an admin role in the Admin Console (Super Admin or delegated with Chrome Management permissions). Having only GCP IAM permissions produces 403 Permission Denied with no indication that a Workspace role is missing.

Available Tools and Prompts

Prompts

Prompt	Description
`cep:diagnose`	Health check of the Chrome Enterprise environment (APIs, DLP, connectors, extensions).
`cep:maturity`	DLP maturity assessment based on rule configuration and events.
`cep:noise`	Rule noise analysis (false positives/overrides) with optimization recommendations.
`cep:expert`	Loads the Chrome Enterprise Premium expert persona with full product context.

Tools

The server exposes tools for reading and managing Chrome Enterprise resources:

Discovery — get customer ID, list org units, count browser versions, list customer profiles
Licensing — check CEP subscription status, check per-user license assignment
DLP — list/create/delete DLP rules, list/create/delete detectors (regex, word list, URL list), create default rule sets
Connectors — get connector policy status, enable Chrome Enterprise connectors
Extensions — check SEB extension status, install SEB extension
Security — get Chrome activity logs, check and enable required APIs
Knowledge — search the built-in Chrome Enterprise Premium knowledge base

Architecture

/
├── lib/
│   ├── api/              # Google Cloud API clients
│   │   ├── interfaces/   # Abstract client contracts
│   │   ├── real_*.js     # Production clients (live Google APIs)
│   │   └── fake_*.js     # Test doubles (local mock server)
│   ├── util/             # Auth, retry logic, CEL validation, logging
│   └── constants.js      # Centralized configuration
├── prompts/              # MCP prompt definitions
│   ├── definitions/      # Individual prompt implementations
│   └── index.js
├── tools/
│   ├── definitions/      # Individual tool implementations
│   ├── utils/            # Tool-specific utilities
│   └── index.js          # Tool registration entry point
├── test/                 # Unit, integration, and eval tests
└── mcp-server.js         # Server entry point

Key design patterns:

Client abstraction — each Google API has an interface (interfaces/), a real implementation (real_*.js), and a fake (fake_*.js). Tools depend on the interface, making them testable without live API calls.
Structured tool output — tools return structured JSON with both machine-readable data and human-readable summaries.
Retry with backoff — API calls retry on PERMISSION_DENIED (gRPC code 7) to handle eventual consistency after enabling APIs.
CEL validation — DLP rule conditions are validated offline against the Chrome CEL grammar before submission.

Development

Fake vs. real backends

Tests and evals can run against two backends:

Fake (default) — an in-process Express server (test/helpers/fake-api-server.js) that simulates all five Google APIs. Returns canned responses, tracks mutations, and resets state between tests. No network calls, no credentials needed.
Real — calls the live Google APIs using your ADC credentials. Requires authentication (Step 1) and API enablement (Step 2). Used for post-merge validation.

The CEP_BACKEND environment variable controls the backend. Integration test scripts accept fake or real as a positional argument.

Running tests

🚦 Run npm run presubmit before every PR. It runs unit tests, fake integration tests, and a smoke test. If presubmit passes, your change is safe to submit.

# Before submitting (no credentials needed)
npm run presubmit

# After merge (requires real API credentials)
npm run postsubmit

Individual test commands:

npm run test:unit                # Unit tests (test/local/)
npm run test:integration:fake    # Integration tests (fake)
npm run test:integration:real    # Integration tests (real)
npm run test:smoke               # Server starts and responds
npm test                         # Unit + smoke

Evaluations

Evals measure agent behavior end-to-end: a Gemini-powered agent calls MCP tools against the fake backend, and responses are graded by deterministic checks and an LLM judge. Requires GEMINI_API_KEY. See test/evals/README.md for the full eval framework documentation.

npm run eval                     # All evals
npm run eval:knowledge           # Knowledge grounding only
npm run eval:agentic             # Tool use only
npm run eval:full                # 3 judge runs per eval

The eval runner accepts flags for filtering and tuning:

# Run a specific eval by ID
node test/evals/run.js --id m01

# Run a category
node test/evals/run.js --category mutation

# Multiple judge runs for consistency
node test/evals/run.js --runs 5

# Skip the LLM judge (deterministic checks only)
node test/evals/run.js --no-judge

# Dry run: validate eval config without Gemini
node test/evals/run.js --dry-run

# Verbose: show full agent responses
node test/evals/run.js --id k01 --verbose

# Write JSON results to a file
node test/evals/run.js --output results/eval.json

Debugging

The MCP Inspector provides a browser UI for invoking tools and prompts directly:

npm run mcp-inspector

Linting and Formatting

npm run lint                     # Check for errors
npm run lint -- --fix            # Auto-fix
npm run format                   # Prettier

HTTP Mode with OAuth

The server also supports HTTP transport with optional OAuth — useful for shared or remote deployments where multiple users connect to a single server instance.

In this mode, the MCP client (e.g., Gemini CLI) authenticates the end user via OAuth and passes their access token as a Bearer header. The server validates the token and uses it directly for Google API calls — ADC is not involved.

GCP_STDIO=false npm start

See .env.example for the full set of OAuth variables and how to configure them. The server exposes .well-known/oauth-protected-resource and .well-known/oauth-authorization-server endpoints so clients can auto-discover the OAuth flow.

Troubleshooting

Authentication

"Could not load the default credentials"

ADC is not configured. Run the login command from Step 1. Verify credentials exist afterward:

cat ~/.config/gcloud/application_default_credentials.json

If the file doesn't exist, login didn't complete (check for browser popup you may have missed).

"Request had insufficient authentication scopes"

Credentials were created without the required scopes — usually because gcloud auth application-default login was run without --scopes. The default scope (cloud-platform) does not cover Workspace APIs like Admin SDK or Chrome Management. You must delete and re-create credentials:

rm ~/.config/gcloud/application_default_credentials.json

Then re-run the full login command from Step 1. There is no way to add scopes to existing ADC credentials.

"API requires a quota project, which is not set by default"

Google needs to know which project's API quotas and enablement to use. This error appears on the first API call, not at login:

gcloud auth application-default set-quota-project YOUR_PROJECT_ID

If you're unsure which project to use, run gcloud projects list and pick the one linked to your Workspace domain.

"invalid_grant" or "Token has been revoked"

Cached credentials are stale. Common causes: password change, admin revoked access, MFA re-enrollment, or token expired after 7 days of inactivity. Delete ~/.config/gcloud/application_default_credentials.json and re-authenticate.

`gcloud` is installed but `gcloud auth` fails with "command not found"

Your shell can find gcloud but not the auth component. Run gcloud components install or reinstall the Cloud SDK. On macOS with Homebrew, brew install google-cloud-sdk sometimes doesn't add auth components — use the official installer instead.

Permissions

"The caller does not have permission" (403)

This is almost always one of three things:

API not enabled — run the gcloud services enable command from Step 2. This is the most common cause on first setup.
Missing Workspace admin role — Chrome and Admin SDK APIs require a Google Workspace admin role (Super Admin or delegated) configured in the Admin Console > Account > Admin roles. GCP IAM roles alone are not sufficient for Workspace APIs.
Missing GCP IAM role — the user needs roles on the GCP project itself (e.g., roles/browser.admin, roles/serviceusage.serviceUsageAdmin).

"PERMISSION_DENIED" followed by retries

Normal on first run. The server retries PERMISSION_DENIED (gRPC code 7) up to 7 times with exponential backoff — the first retry waits 15 seconds. This handles the propagation delay after enabling APIs. If retries exhaust, the permission issue is real — check the three items above.

Node.js

"Cannot find module" or "ERR_MODULE_NOT_FOUND"

Dependencies are missing. Run npm install from the project root.

"ExperimentalWarning: ... is an experimental feature"

Harmless. Some Node.js features used by dependencies emit warnings on older Node versions. Upgrade to Node 20+ to suppress, or ignore them — they don't affect functionality.

Wrong Node version

The server requires Node >= 18. Check with node --version. If you're using nvm, make sure you've run nvm use 18 (or higher) in the project directory. MCP clients launch node as a subprocess — they use whatever node is on the system PATH, which may differ from your shell's nvm-managed version.

MCP Client Integration

Tools don't appear in the client

Restart the client after editing its config file — most clients don't hot-reload MCP config.
Use absolute paths — the args path in your config must be absolute. Relative paths resolve from the client's working directory, which is unpredictable.
Check node visibility — GUI apps (Claude Desktop, VS Code) may not inherit your shell PATH. Try the full path to node: "command": "/usr/local/bin/node" (find yours with which node).
Test manually — run node /path/to/cmcp/mcp-server.js in a terminal. You should see [mcp] Chrome Enterprise Premium MCP server stdio transport connected on stderr. If you see errors instead, fix those first.

Server starts but immediately exits

Check stderr output. Common causes: missing .env values the server expects, or a port conflict if accidentally running in HTTP mode (GCP_STDIO=false).

FAQ

Do I need a Chrome Enterprise Premium license?

Yes. DLP rules, content detectors, Chrome connectors, and threat protection are CEP features — they require an active Chrome Enterprise Premium license assigned to the relevant users. Without it, most tools will return permission errors. A 60-day free trial is available from the Admin Console or Cloud Console.

Which Google Workspace edition do I need?

Chrome Enterprise Premium is a paid add-on available with any Google Workspace edition. Chrome Enterprise Core (free) provides policy management for over 300 policies but does not include DLP, threat protection, or Context-Aware Access. See Chrome Enterprise Premium pricing for current rates.

Can I use a service account instead of user credentials?

Yes, but the service account must have domain-wide delegation configured in the Admin Console with the required scopes. Set GOOGLE_APPLICATION_CREDENTIALS to point to the key file.

Why do I see "Retrying in 15s..." on first use?

Newly enabled APIs take a few minutes to propagate. The server retries automatically. This is normal on first run and should resolve within a minute or two.

How do I enable experimental features?

Some tools (e.g., deletion of DLP rules and detectors) are gated behind feature flags and disabled by default. Enable them with EXPERIMENT_ prefixed environment variables:

EXPERIMENT_DELETE_TOOL_ENABLED=true npm start

See lib/util/feature_flags.js for the full list of available flags.

Reporting Bugs

If something isn't working:

In Gemini CLI, run /bug to capture session diagnostics. Attach the generated file to your issue.
Run npm run presubmit and include the output — this helps determine whether the issue is environmental or a code bug.
Describe what you expected vs. what actually happened, including the exact error message.

Contributing

Contributions are welcome! Please read the CONTRIBUTING.md file for details on how to contribute to this project.

Legal

License: Apache License 2.0
Terms of Service: Terms of Service
Privacy Policy: Privacy Policy
Security: Security Policy

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adk		adk
gemini-extension		gemini-extension
lib		lib
prompts		prompts
test		test
tools		tools
.commit_msg		.commit_msg
.env.example		.env.example
.gitignore		.gitignore
.prettierrc		.prettierrc
CONTRIBUTING.md		CONTRIBUTING.md
Dockerfile		Dockerfile
LICENSE		LICENSE
README.md		README.md
SECURITY.md		SECURITY.md
eslint.config.mjs		eslint.config.mjs
gemini-extension.json		gemini-extension.json
mcp-server.js		mcp-server.js
package-lock.json		package-lock.json
package.json		package.json

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Chrome Enterprise Premium MCP Server

Important security consideration: Indirect Prompt Injection Risk

Quick Start

1. Authenticate with Google Cloud

2. Enable Required APIs

3. Connect Your MCP Client

4. Verify

Configuration (.env)

Prerequisites

Available Tools and Prompts

Prompts

Tools

Architecture

Development

Fake vs. real backends

Running tests

Evaluations

Debugging

Linting and Formatting

HTTP Mode with OAuth

Troubleshooting

Authentication

"Could not load the default credentials"

"Request had insufficient authentication scopes"

"API requires a quota project, which is not set by default"

"invalid_grant" or "Token has been revoked"

gcloud is installed but gcloud auth fails with "command not found"

Permissions

"The caller does not have permission" (403)

"PERMISSION_DENIED" followed by retries

Node.js

"Cannot find module" or "ERR_MODULE_NOT_FOUND"

"ExperimentalWarning: ... is an experimental feature"

Wrong Node version

MCP Client Integration

Tools don't appear in the client

Server starts but immediately exits

FAQ

Do I need a Chrome Enterprise Premium license?

Which Google Workspace edition do I need?

Can I use a service account instead of user credentials?

Why do I see "Retrying in 15s..." on first use?

How do I enable experimental features?

Reporting Bugs

Contributing

Legal

About

Resources

License

Code of conduct

Contributing

Security policy

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Watchers

Forks

Releases

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Configuration (`.env`)

`gcloud` is installed but `gcloud auth` fails with "command not found"

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