> ## Documentation Index > Fetch the complete documentation index at: https://docs.formal.ai/llms.txt > Use this file to discover all available pages before exploring further. # Google Drive > Search, read, create, and share files across Google Drive and Workspace. Knowledge Publisher: Google Route Google Drive MCP traffic through Formal to control and log what AI agents do in Google Drive: * **Block** risky tools, such as `update_file`. * **Mask** sensitive data in tool results, such as emails and phone numbers in `get_file_permissions` responses. * **Keep credentials at the Connector**, so users and agents never see Google Drive tokens. * **Log** every tool call with the user, the MCP client and its parameters. Cloud agents Laptop / VM Endpoint [https://drivemcp.googleapis.com/mcp/v1](https://drivemcp.googleapis.com/mcp/v1) Connector ![](https://docs.formal.ai/static/brands/google-drive.png) ## 0. Prepare your Connector The Connector needs an MCP listener and a hostname with wildcard DNS and TLS. Set them up once by following [Deploy the Connector](https://docs.formal.ai/docs/guides/core-concepts/connectors/mcp-gateway.md#deploy-the-connector). Every MCP server reuses them. ## 1. Add Google Drive MCP server to your Resources > [tab] UI > > 1. Open the [Admin Catalog](https://app.formal.ai/catalog) and click **Add MCP**. > 2. Select the **Google Drive** template. > 3. Enter a DNS-label **Name**, such as `google-drive`. > 4. Choose the **Space** containing your Connector, such as `default`. > 5. Configure upstream authentication as described below, then save. > > If no Connector is in the selected Space, the **Configuration** tab shows **MCP clients can't connect directly yet**. > The reason reads: `No Connector is in this server's Space.` > > Adding Google Drive to the Admin Catalog > [tab] Terraform > > Set `space_id` to the ID of the Space containing your Connector. > > ```hcl theme={"languages":{"custom":["/languages/cel.json","/languages/rego.json"]}} > resource "formal_resource" "google_drive" { > name = "google-drive" > technology = "mcp" > hostname = "drivemcp.googleapis.com" > space_id = "" > native_users_v3_enabled = true > port = 443 > tags = { > "mcp-endpoint" = "/mcp/v1" > } > } > > resource "formal_resource_oauth_settings" "google_drive" { > resource_id = formal_resource.google_drive.id > } > ``` > [tab] Pulumi > > Set `spaceId` to the ID of the Space containing your Connector. > > ```ts theme={"languages":{"custom":["/languages/cel.json","/languages/rego.json"]}} > import * as formal from "@formalco/pulumi"; > > const resource = new formal.Resource("mcp", { > name: "google-drive", > technology: "mcp", > hostname: "drivemcp.googleapis.com", > port: 443, > spaceId: "", > tags: { "mcp-endpoint": "/mcp/v1" }, > nativeUsersV3Enabled: true, > }); > > new formal.ResourceOauthSettings("mcpOAuth", { > resourceId: resource.id, > }); > ``` > [tab] API > > Create a Resource with the MCP endpoint and its Space ID. > > ```bash theme={"languages":{"custom":["/languages/cel.json","/languages/rego.json"]}} > export FORMAL_API_KEY="" > RESOURCE_RESPONSE=$(curl --fail --silent --show-error \ > --request POST \ > https://api.formal.ai/core.v1.ResourceService/CreateResource \ > --header "x-api-key: ${FORMAL_API_KEY}" \ > --header "Content-Type: application/json" \ > --data-binary @- < { > "name": "google-drive", > "hostname": "drivemcp.googleapis.com", > "port": 443, > "technology": "mcp", > "spaceId": "", > "tags": [ > { > "key": "mcp-endpoint", > "value": "/mcp/v1" > } > ] > } > JSON > ) > RESOURCE_ID=$(printf '%s' "${RESOURCE_RESPONSE}" | jq -r '.resource.id') > curl --fail --silent --show-error \ > --request POST \ > https://api.formal.ai/core.v1.ResourceService/CreateResourceOAuthSettings \ > --header "x-api-key: ${FORMAL_API_KEY}" \ > --header "Content-Type: application/json" \ > --data-binary @- < { > "resourceId": "${RESOURCE_ID}" > } > JSON > ``` ## 2. Setup Authentication > [tab] Linked Accounts (Recommended) > > Each user links their own Google Drive account once in the Employee Catalog, and the Connector sends that user's token to Google Drive. > > ![Linked Accounts selected under How does Formal authenticate to this resource?](https://mintcdn.com/formal/vzPMpIcsF4BYmdx8/assets/images/mcp-servers/auth-linked-accounts.png?fit=max\&auto=format\&n=vzPMpIcsF4BYmdx8\&q=85\&s=dc448db2a373faa6e1bf49fd5ffaf7c4) > > Google Drive doesn't support Formal's App, so register your own OAuth app. > > See [Google Drive OAuth documentation](https://developers.google.com/workspace/drive/api/guides/configure-mcp-server) and [register an app](https://console.cloud.google.com/auth/clients/create). > > **1. Configure the project** > > Enable the Drive API and Drive MCP API, then configure **Google Auth Platform > Branding**. > > **2. Choose scopes** > > Open **Data Access > Add or Remove Scopes**, add the required scopes, and click **Update**, then **Save**. > > **3. Create the client** > > Open [Google Auth Platform > Clients](https://console.cloud.google.com/auth/clients), click **Create Client**, select **Web application**, and enter a **Name**. > > **4. Set the callback** > > Under **Authorized redirect URIs**, click **+ Add URI** and paste Formal's **Redirect URI** into **URIs**. > > **5. Get credentials** > > Select **Use this client for an AI-powered agent**, click **Create**, and copy the **Client ID** and **Client Secret**. > > **6. Enter the app in Formal** > > > [tab] UI > > > > Back in the Admin Catalog, enter the **Client ID** and **Client secret**, then save. > > Users then link their accounts on the Google Drive server's page in the [Employee Catalog](https://catalog.formal.ai). > > > > ![Your OAuth App selected in the Admin Catalog, with the Redirect URI, Client ID and Client secret fields](https://mintcdn.com/formal/R-3CwVgs8IU6liji/assets/images/mcp-servers/your-oauth-app.png?fit=max\&auto=format\&n=R-3CwVgs8IU6liji\&q=85\&s=00584678f4f2696805678de060eaea0a) > > > [tab] Terraform > > > > Use these OAuth settings instead of the ones from step 1. > > > > ```hcl theme={"languages":{"custom":["/languages/cel.json","/languages/rego.json"]}} > > variable "google_drive_oauth_client_secret" { > > type = string > > sensitive = true > > } > > > > resource "formal_resource_oauth_settings" "google_drive" { > > resource_id = formal_resource.google_drive.id > > upstream_oauth_mode = "pre_registered" > > client_id = "" > > client_secret_wo = var.google_drive_oauth_client_secret > > client_secret_wo_version = 1 > > } > > ``` > > > [tab] Pulumi > > > > Use these OAuth settings instead of the ones from step 1. > > Store the secret with `pulumi config set --secret googleDriveOauthClientSecret`. > > > > ```ts theme={"languages":{"custom":["/languages/cel.json","/languages/rego.json"]}} > > import * as pulumi from "@pulumi/pulumi"; > > > > const config = new pulumi.Config(); > > > > new formal.ResourceOauthSettings("mcpOAuth", { > > resourceId: resource.id, > > upstreamOauthMode: "pre_registered", > > clientId: "", > > clientSecret: config.requireSecret("googleDriveOauthClientSecret"), > > }); > > ``` > > > [tab] API > > > > Use this call instead of the `CreateResourceOAuthSettings` call from step 1. > > The OAuth app is fixed at creation. > > > > ```bash theme={"languages":{"custom":["/languages/cel.json","/languages/rego.json"]}} > > curl --fail --silent --show-error \ > > --request POST \ > > https://api.formal.ai/core.v1.ResourceService/CreateResourceOAuthSettings \ > > --header "x-api-key: ${FORMAL_API_KEY}" \ > > --header "Content-Type: application/json" \ > > --data-binary @- < > { > > "resourceId": "${RESOURCE_ID}", > > "upstreamOauthMode": "pre_registered", > > "clientId": "", > > "clientSecret": "" > > } > > JSON > > ``` > [tab] Shared Credentials > > An administrator stores one Google Drive token in Formal, and the Connector sends it on every user's requests without showing it to them. > > ![Shared Credentials selected under How does Formal authenticate to this resource?](https://mintcdn.com/formal/R-3CwVgs8IU6liji/assets/images/mcp-servers/auth-shared-credentials.png?fit=max\&auto=format\&n=R-3CwVgs8IU6liji\&q=85\&s=91032e202518088292ee1cf39451b9ef) > > Google Drive's MCP endpoint doesn't accept API tokens, so use Linked Accounts. > [tab] Pass Through > > Each user sends their own Google Drive sign-in or token from their MCP client, and Formal forwards it unchanged without storing it. > > ![Pass Through selected under How does Formal authenticate to this resource?](https://mintcdn.com/formal/R-3CwVgs8IU6liji/assets/images/mcp-servers/auth-pass-through.png?fit=max\&auto=format\&n=R-3CwVgs8IU6liji\&q=85\&s=c14ae61de2dba8b567626cba03aae2cf) > > Nothing in the request identifies the Formal user. Formal attributes these requests only when they come through the [Formal Endpoint](https://docs.formal.ai/docs/guides/core-concepts/connectors/mcp-gateway.md#identity-headers). Pass-through servers have no Connector address, so cloud agents can't use them. > > For OAuth, each MCP client signs in to Google Drive itself. ## 3. Route Endpoint traffic Auth is managed at the Connector level when you use Linked Accounts or Shared Credentials, so the Endpoint needs to forward the MCP traffic to it. Laptops and VMs with the Formal Endpoint keep using `https://drivemcp.googleapis.com/mcp/v1`, and a network rule sends that traffic to the Connector. > [tab] UI > > 1. Go to [Network Rules](https://app.formal.ai/network-rules) and create a rule named `google-drive-mcp`. > 2. Paste this expression, set the rule to **Active**, then save: > > ```javascript theme={"languages":{"custom":["/languages/cel.json","/languages/rego.json"]}} > { > "condition": { > "pre_tcp": process.is_agent, > // Every MCP server added to Formal: process.is_agent && resource.technology == "mcp" > "pre_tls": process.is_agent && hostname == "drivemcp.googleapis.com", > "post_tls": true > }, > "outputs": { > "forward_to_connector": true > } > } > ``` > [tab] Terraform > > ```hcl theme={"languages":{"custom":["/languages/cel.json","/languages/rego.json"]}} > resource "formal_network_rule" "google_drive_mcp" { > name = "google-drive-mcp" > description = "Forward Google Drive MCP traffic from agents to the Connector" > status = "active" > > # Every MCP server added to Formal: set pre_tls to process.is_agent && resource.technology == "mcp" > cel_expression = <<-EOT > { > "condition": { > "pre_tcp": process.is_agent, > "pre_tls": process.is_agent && hostname == "drivemcp.googleapis.com", > "post_tls": true > }, > "outputs": { > "forward_to_connector": true > } > } > EOT > } > ``` > [tab] Pulumi > > ```ts theme={"languages":{"custom":["/languages/cel.json","/languages/rego.json"]}} > import * as formal from "@formalco/pulumi"; > > new formal.NetworkRule("googleDriveMcp", { > name: "google-drive-mcp", > description: "Forward Google Drive MCP traffic from agents to the Connector", > status: "active", > // Every MCP server added to Formal: set pre_tls to process.is_agent && resource.technology == "mcp" > celExpression: ` > { > "condition": { > "pre_tcp": process.is_agent, > "pre_tls": process.is_agent && hostname == "drivemcp.googleapis.com", > "post_tls": true > }, > "outputs": { > "forward_to_connector": true > } > } > `, > }); > ``` > [tab] API > > ```bash theme={"languages":{"custom":["/languages/cel.json","/languages/rego.json"]}} > export FORMAL_API_KEY="" > # Every MCP server added to Formal: set pre_tls to process.is_agent && resource.technology == "mcp" > CEL_EXPRESSION=$(cat <<'CEL' > { > "condition": { > "pre_tcp": process.is_agent, > "pre_tls": process.is_agent && hostname == "drivemcp.googleapis.com", > "post_tls": true > }, > "outputs": { > "forward_to_connector": true > } > } > CEL > ) > jq -n --arg cel "${CEL_EXPRESSION}" '{ > name: "google-drive-mcp", > description: "Forward Google Drive MCP traffic from agents to the Connector", > status: "active", > celExpression: $cel > }' | curl --fail --silent --show-error \ > --request POST \ > https://api.formal.ai/core.v1.DesktopService/CreateDesktopRoutingRule \ > --header "x-api-key: ${FORMAL_API_KEY}" \ > --header "Content-Type: application/json" \ > --data-binary @- > ``` The rule matches [known agents](https://docs.formal.ai/docs/guides/network-rules.md#known-agent-identities) only. See [Identity headers](https://docs.formal.ai/docs/guides/core-concepts/connectors/mcp-gateway.md#identity-headers). Cloud agents such as Claude, ChatGPT and Cursor Cloud Agents don't run the Endpoint. Point them at this server's Connector address, `https://google-drive./mcp`. Find it in the [Admin Catalog](https://app.formal.ai/catalog): open Google Drive, then copy **Connector address** on the **Configuration** tab. ## 4. Create policies ### Tools The Admin Catalog lists these tools for Google Drive: | Tool | Description | | - | - | | `search_files` | Search files in Google Drive. | | `list_recent_files` | List recently accessed Drive files. | | `get_file_metadata` | Retrieve file metadata. | | `read_file_content` | Read supported file content. | | `download_file_content` | Download the original content of a file. | | `create_file` | Create a file in Drive. | | `update_file` | Update a file's content or metadata. | | `copy_file` | Copy a file. | | `trash_file` | Move a file to trash. | | `get_file_permissions` | List permissions on a file. | | `share_file` | Share a file with a user or group. | ### Policies examples > [tab] Block a tool > > This policy blocks the tools that change data, so agents can only read Google Drive. > > ```rego theme={"languages":{"custom":["/languages/cel.json","/languages/rego.json"]}} > package formal.v2 > > import future.keywords.if > import future.keywords.in > > write_tools := { > "create_file", > "update_file", > "copy_file", > "trash_file", > "share_file", > } > > request := { > "action": "block", > "type": "block_with_custom_message", > "message": "Writing to Google Drive is not allowed.", > } if { > input.resource.name == "google-drive" > input.mcp.method == "tools/call" > input.mcp.tool_name in write_tools > } > ``` > [tab] Mask a tool's output > > This policy replaces email addresses in results returned by `get_file_permissions`, `get_file_metadata`, and `read_file_content`. > > ```rego theme={"languages":{"custom":["/languages/cel.json","/languages/rego.json"]}} > package formal.v2 > > import future.keywords.if > import future.keywords.in > > email_pattern := `[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,}` > > response := { > "action": "rewrite", > "body": regex.replace(input.http.body, email_pattern, "[REDACTED-EMAIL]"), > "reason": "Mask emails in Google Drive results", > } if { > input.resource.name == "google-drive" > input.mcp.tool_name in {"get_file_permissions", "get_file_metadata", "read_file_content"} > regex.match(email_pattern, input.http.body) > } > ``` See [MCP resources](https://docs.formal.ai/docs/guides/policies/evaluation.md#mcp-resources) for the `input.mcp` fields and [Rewrite Action](https://docs.formal.ai/docs/guides/policies/enforcement.md#rewrite-action) for body rewrites. ## 5. Check the logs Open [Logs](https://app.formal.ai/logs) and search for `resource.name:google-drive`. Each Google Drive tool call is one `request` log with the user, the MCP client and the tool. Open a log to see its tool parameters and the policies it triggered. A blocked write shows the block policy and its message. A masked search shows the rewrite policy. Google Drive tool calls in Logs, including a masked response and a blocked write See [Logs](https://docs.formal.ai/docs/guides/observability/logs.md) for search syntax and filters. ## Troubleshooting > [accordion] The agent says Formal has no current sign-in > > The agent relays: `Formal has no current google-drive sign-in for you. Link or re-link your google-drive account in Formal…` > > **Cause:** The user never linked Google Drive, or the token expired and couldn't be refreshed. > > **Fix:** Open the server in the [Employee Catalog](https://catalog.formal.ai) and link Google Drive again. > [accordion] The agent says Google Drive rejected your credentials > > The agent relays: `google-drive rejected your credentials. Link or re-link your google-drive account in Formal…` > > **Cause:** Google Drive no longer accepts the linked token, for example after the user revoked access in Google Drive. > > **Fix:** Link Google Drive again from the [Employee Catalog](https://catalog.formal.ai). > [accordion] Laptop traffic doesn't appear in Logs > > **Cause:** The Endpoint isn't running, or the network rule doesn't match the client. > > **Fix:** Check the Endpoint is connected. The rule above only matches [known agents](https://docs.formal.ai/docs/guides/network-rules.md#known-agent-identities). Other clients, such as a browser, reach Google Drive directly unless the rule also matches them. See [Network rules](https://docs.formal.ai/docs/guides/network-rules.md). > [accordion] MCP clients can't connect directly yet > > **Cause:** The **Configuration** tab lists the reason, most often `No Connector is in this server's Space.` > > **Fix:** Edit the server and choose the Space containing its Connector. ## Next Steps > [card] [MCP Gateway](https://docs.formal.ai/docs/guides/core-concepts/connectors/mcp-gateway.md) > > Configure Connector routing and downstream access > [card] [All MCP servers](https://docs.formal.ai/docs/guides/core-concepts/connectors/mcp-servers/index.md) > > Browse every MCP server template This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.