Authenticating Looker CLI

Authenticating Looker CLI

Authenticates the Looker CLI to a Looker instance using OAuth and saves the session configuration in a named profile.

Prerequisites

• Looker CLI must be installed (see installing-looker-cli skill).
• You must know the Looker instance URL (host and API port). Generically, the API port is 443 for Looker Core / Google Cloud Core.

Instructions

1. Configure a Named Profile

Create a new profile named default to save your connection details:

looker-cli profile add default --host {instance_host} --port {instance_port}

Set this new profile as your default configuration:

looker-cli profile use default

2. Trigger OAuth Login

Run the login command in the background (since it requires interactive browser authorization):

looker-cli session login --oauth

3. Retrieve the Authorization URL

Monitor the background login task log or stdout to extract the generated login URL. Looker CLI will output:

Opening browser to URL: followed by a long URL.

4. Instruct the User (Interactive Step)

Present the login URL to the user and instruct them:

"Please open the following URL in your browser, log in to Looker, and authorize the CLI:

URL: {auth_url}

If you are running on a local desktop machine, the login should complete automatically once authorized. If you are on a remote server/headless workspace, the browser will show a page load error or try to redirect to http://127.0.0.1:7777/?code=.... Please copy the entire redirected URL from your browser's address bar and paste it back into the terminal prompt."

5. Handle the OAuth Response

• Scenario A (Automatic): If the user completes authentication and the CLI is listening locally on port 7777, the login command task will finish successfully.
• Scenario B (Headless Fallback): The background process will print: Paste redirected URL here: If the user pastes the redirected URL, use manage_task with send_input to pass the pasted URL directly to the background login task.

Once complete, looker-cli will automatically save the access and refresh tokens into your default profile in ~/.config/looker-cli/config.yaml.

6. Verify Authentication

Confirm you can successfully communicate with the Looker API without passing any connection flags:

looker-cli user me

This should return a JSON object containing the authenticated user details.

7. Pre-flight Check: Looker User Privileges

Verify that your authenticated user account has the required developer and connection management permissions:

1. Inspect the roles and permissions in the output of looker-cli user me.
2. Confirm the account has roles containing develop and manage_project_connections permissions (or the Admin role as a fallback).
3. If privileges are insufficient: Warn the user and pause to wait for updates: > "I have authenticated successfully, but I noticed your Looker user account lacks the required 'develop' and 'manage_project_connections' permissions (or the 'Admin' role). > > Without these developer permissions, I will not be able to create the database connection, project, or write LookML. Please grant these permissions to my user account in the Looker console and let me know once done so we can proceed!"