Deploy an agent for generative AI application
Important
This feature is in Public Preview.
This article shows how to deploy your AI agent using the deploy() API from databricks.agents.
Requirements
MLflow 2.13.1 or above to deploy agents using the the
deploy()API fromdatabricks.agents.Register an AI agent to Unity Catalog. See Register the chain to Unity Catalog.
Install the the
databricks-agentsSDK.%pip install databricks-agents dbutils.library.restartPython()
Deploy an agent using deploy()
The deploy() API does the following:
- Creates CPU model serving endpoints for your agent that can be integrated into your user-facing application.
- Inference tables are enabled on these model serving endpoints. See Inference tables for monitoring and debugging models.
- Authentication credentials are automatically passed to all Databricks-managed resources required by the agent as specified when logging the model. Databricks creates a service principal that has access to these resources, and automatically passes that into the endpoint. See Authentication for dependent resources.
- If you have resource dependencies that are not Databricks-managed, for example using Pinecone, you can pass in environment variables with secrets to the
deploy()API. See Configure access to resources from model serving endpoints.
- Inference tables are enabled on these model serving endpoints. See Inference tables for monitoring and debugging models.
- Enables the Review App for your agent. The Review App allows your stakeholders to chat with the agent and give feedback using the Review App UI.
- Logs every request to the Review App or REST API to an inference table. The data logged includes query requests, responses, and intermediate trace data from MLflow Tracing.
- Creates a feedback model with the same catalog and schema as the agent you are trying to deploy. This feedback model is the mechanism that makes it possible to accept feedback from the Review App and log it to an inference table. This model is served in the same CPU model serving endpoint as your deployed agent. Because this serving endpoint has inference tables enabled, it is possible to log feedback from the Review App to an inference table.
Note
Deployments can take up to 15 minutes to complete. Raw JSON payloads take 10 - 30 minutes to arrive, and the formatted logs are processed from the raw payloads about every hour.
from databricks.agents import deploy
from mlflow.utils import databricks_utils as du
deployment = deploy(model_fqn, uc_model_info.version)
# query_endpoint is the URL that can be used to make queries to the app
deployment.query_endpoint
# Copy deployment.rag_app_url to browser and start interacting with your RAG application.
deployment.rag_app_url
Agent-enhanced inference tables
The deploy() creates three inference tables for each deployment to log requests and responses to and from the agent serving endpoint. Users can expect the data to be in the payload table within an hour of interacting with their deployment.
Payload request logs and assessment logs might take longer to populate, but are ultimately derived from the raw payload table. You can extract request and assessment logs from the payload table yourself. Deletions and updates to the payload table are not reflected in the payload request logs or the payload assessment logs.
Note
If you have Azure Storage Firewall enabled, reach out to your Databricks account team to enable inference tables for your endpoints.
| Table | Example Unity Catalog table name | What is in each table |
|---|---|---|
| Payload | {catalog_name}.{schema_name}.{model_name}_payload |
Raw JSON request and response payloads |
| Payload request logs | {catalog_name}.{schema_name}.{model_name}_payload_request_logs |
Formatted request and responses, MLflow traces |
| Payload assessment logs | {catalog_name}.{schema_name}.{model_name}_payload_assessment_logs |
Formatted feedback, as provided in the Review App, for each request |
The following shows the schema for the request logs table.
| Column name | Type | Description |
|---|---|---|
client_request_id |
String | Client request ID, usually null. |
databricks_request_id |
String | Databricks request ID. |
date |
Date | Date of request. |
timestamp_ms |
Long | Timestamp in milliseconds. |
timestamp |
Timestamp | Timestamp of the request. |
status_code |
Integer | Status code of endpoint. |
execution_time_ms |
Long | Total execution milliseconds. |
conversation_id |
String | Conversation id extracted from request logs. |
request |
String | The last user query from the user’s conversation. This is extracted from the RAG request. |
response |
String | The last response to the user. This is extracted from the RAG request. |
request_raw |
String | String representation of request. |
response_raw |
String | String representation of response. |
trace |
String | String representation of trace extracted from the databricks_options of response Struct. |
sampling_fraction |
Double | Sampling fraction. |
request_metadata |
Map[String, String] | A map of metadata related to the model serving endpoint associated with the request. This map contains the endpoint name, model name, and model version used for your endpoint. |
schema_version |
String | Integer for the schema version. |
The following is the schema for the assessment logs table.
| Column name | Type | Description |
|---|---|---|
request_id |
String | Databricks request ID. |
step_id |
String | Derived from retrieval assessment. |
source |
Struct | A struct field containing the information on who created the assessment. |
timestamp |
Timestamp | Timestamp of request. |
text_assessment |
Struct | A struct field containing the data for any feedback on the agent’s responses from the review app. |
retrieval_assessment |
Struct | A struct field containing the data for any feedback on the documents retrieved for a response. |
Authentication for dependent resources
When creating the model serving endpoint for agent deployment, Databricks verifies that the creator of the endpoint has permissions to access all resources on which the agent depends.
For LangChain flavored agents, dependent resources are automatically inferred during agent creation and logging. Those resources are logged in the resources.yaml file in the logged model artifact. During deployment, databricks.agents.deploy automatically creates the M2M OAuth tokens required to access and communicate with these inferred resource dependencies.
For PyFunc flavored agents, you must manually specify any resource dependencies during logging of the deployed agent in the resources parameter. See Specify resources for PyFunc agent.
During deployment, databricks.agents.deploy creates an M2M OAuth token with access to the resources specified in the resources parameter, and deploys it to the deployed agent.
Automatic authentication passthrough
The following table lists the features that support automatic authentication passthrough. Automatic authentication passthrough uses the credentials of the deployment creator to automatically authenticate against supported features.
| Feature | Minimum mlflow version |
|---|---|
| Vector search indexes | Requires mlflow 2.13.1 or above |
| Model Serving endpoints | Requires mlflow 2.13.1 or above |
| SQL warehouses | Requires mlflow 2.16.1 or above |
| Unity Catalog Functions | Requires mlflow 2.16.1 or above |
Manual authentication
If you have a dependent resource that does not support automatic authentication passthrough, or if you want to use credentials other than those of the deployment creator, you can manually provide credentials using secrets-based environment variables. For example, if using the Databricks SDK in your agent to access other types of dependent resources, you can set the environment variables described in Databricks client unified authentication.
Get deployed applications
The following shows how to get your deployed agents.
from databricks.agents import list_deployments, get_deployments
# Get the deployment for specific model_fqn and version
deployment = get_deployments(model_name=model_fqn, model_version=model_version.version)
deployments = list_deployments()
# Print all the current deployments
deployments