adk-python/contributing/samples/spanner

Spanner Tools Sample

Introduction

This sample agent demonstrates the Spanner first-party tools in ADK, distributed via the google.adk.tools.spanner module. These tools include:

1. list_table_names

Fetches Spanner table names present in a GCP Spanner database.

1. list_table_indexes

Fetches Spanner table indexes present in a GCP Spanner database.

1. list_table_index_columns

Fetches Spanner table index columns present in a GCP Spanner database.

1. list_named_schemas

Fetches named schema for a Spanner database.

1. get_table_schema

Fetches Spanner database table schema and metadata information.

1. execute_sql

Runs a SQL query in Spanner database.

How to use

Set up environment variables in your .env file for using Google AI Studio or Google Cloud Vertex AI for the LLM service for your agent. For example, for using Google AI Studio you would set:

• GOOGLE_GENAI_USE_VERTEXAI=FALSE
• GOOGLE_API_KEY={your api key}

With Application Default Credentials

This mode is useful for quick development when the agent builder is the only user interacting with the agent. The tools are run with these credentials.

1. Create application default credentials on the machine where the agent would be running by following https://cloud.google.com/docs/authentication/provide-credentials-adc.

2. Set CREDENTIALS_TYPE=None in agent.py

3. Run the agent

With Service Account Keys

This mode is useful for quick development when the agent builder wants to run the agent with service account credentials. The tools are run with these credentials.

1. Create service account key by following https://cloud.google.com/iam/docs/service-account-creds#user-managed-keys.

2. Set CREDENTIALS_TYPE=AuthCredentialTypes.SERVICE_ACCOUNT in agent.py

3. Download the key file and replace "service_account_key.json" with the path

4. Run the agent

With Interactive OAuth

1. Follow https://developers.google.com/identity/protocols/oauth2#1.-obtain-oauth-2.0-credentials-from-the-dynamic_data.setvar.console_name. to get your client id and client secret. Be sure to choose "web" as your client type.

2. Follow https://developers.google.com/workspace/guides/configure-oauth-consent to add scope "https://www.googleapis.com/auth/spanner.data" and "https://www.googleapis.com/auth/spanner.admin" as declaration, this is used for review purpose.

3. Follow https://developers.google.com/identity/protocols/oauth2/web-server#creatingcred to add http://localhost/dev-ui/ to "Authorized redirect URIs".

   Note: localhost here is just a hostname that you use to access the dev ui, replace it with the actual hostname you use to access the dev ui.

4. For 1st run, allow popup for localhost in Chrome.

5. Configure your .env file to add two more variables before running the agent:

   • OAUTH_CLIENT_ID={your client id}
   • OAUTH_CLIENT_SECRET={your client secret}

   Note: don't create a separate .env, instead put it to the same .env file that stores your Vertex AI or Dev ML credentials

6. Set CREDENTIALS_TYPE=AuthCredentialTypes.OAUTH2 in agent.py and run the agent

Sample prompts

• Show me all tables in the product_db Spanner database.
• Describe the schema of the product_table table.
• List all indexes on the product_table table.
• Show me the first 10 rows of data from the product_table table.
• Write a query to find the most popular product by joining the product_table and sales_table tables.