feat: wire runtime entrypoints to service factory defaults

This change routes adk run and the FastAPI server through the new session/artifact service factory, keeps the default experience backed by per-agent .adk storage

Co-authored-by: George Weale <gweale@google.com>
PiperOrigin-RevId: 836733234

src/google/adk/cli/cli.py

@@ -15,6 +15,7 @@
 from __future__ import annotations
 
 from datetime import datetime
+from pathlib import Path
 from typing import Optional
 from typing import Union
 
@@ -22,7 +23,6 @@ import click
 from google.genai import types
 from pydantic import BaseModel
 
-from ..agents.base_agent import BaseAgent
 from ..agents.llm_agent import LlmAgent
 from ..apps.app import App
 from ..artifacts.base_artifact_service import BaseArtifactService
@@ -35,8 +35,11 @@ from ..sessions.in_memory_session_service import InMemorySessionService
 from ..sessions.session import Session
 from ..utils.context_utils import Aclosing
 from ..utils.env_utils import is_env_enabled
+from .service_registry import load_services_module
 from .utils import envs
 from .utils.agent_loader import AgentLoader
+from .utils.service_factory import create_artifact_service_from_options
+from .utils.service_factory import create_session_service_from_options
 
 
 class InputFile(BaseModel):
@@ -66,7 +69,7 @@ async def run_input_file(
   )
   with open(input_path, 'r', encoding='utf-8') as f:
     input_file = InputFile.model_validate_json(f.read())
-  input_file.state['_time'] = datetime.now()
+  input_file.state['_time'] = datetime.now().isoformat()
 
   session = await session_service.create_session(
       app_name=app_name, user_id=user_id, state=input_file.state
@@ -134,6 +137,8 @@ async def run_cli(
     saved_session_file: Optional[str] = None,
     save_session: bool,
     session_id: Optional[str] = None,
+    session_service_uri: Optional[str] = None,
+    artifact_service_uri: Optional[str] = None,
 ) -> None:
   """Runs an interactive CLI for a certain agent.
 
@@ -148,24 +153,47 @@ async def run_cli(
       contains a previously saved session, exclusive with input_file.
     save_session: bool, whether to save the session on exit.
     session_id: Optional[str], the session ID to save the session to on exit.
+    session_service_uri: Optional[str], custom session service URI.
+    artifact_service_uri: Optional[str], custom artifact service URI.
   """
-
-  artifact_service = InMemoryArtifactService()
-  session_service = InMemorySessionService()
-  credential_service = InMemoryCredentialService()
-
+  agent_parent_path = Path(agent_parent_dir).resolve()
+  agent_root = agent_parent_path / agent_folder_name
+  load_services_module(str(agent_root))
   user_id = 'test_user'
-  agent_or_app = AgentLoader(agents_dir=agent_parent_dir).load_agent(
+
+  # Create session and artifact services using factory functions
+  session_service = create_session_service_from_options(
+      base_dir=agent_root,
+      session_service_uri=session_service_uri,
+  )
+
+  artifact_service = create_artifact_service_from_options(
+      base_dir=agent_root,
+      artifact_service_uri=artifact_service_uri,
+  )
+
+  credential_service = InMemoryCredentialService()
+  agents_dir = str(agent_parent_path)
+  agent_or_app = AgentLoader(agents_dir=agents_dir).load_agent(
       agent_folder_name
   )
   session_app_name = (
       agent_or_app.name if isinstance(agent_or_app, App) else agent_folder_name
   )
-  session = await session_service.create_session(
-      app_name=session_app_name, user_id=user_id
-  )
   if not is_env_enabled('ADK_DISABLE_LOAD_DOTENV'):
-    envs.load_dotenv_for_agent(agent_folder_name, agent_parent_dir)
+    envs.load_dotenv_for_agent(agent_folder_name, agents_dir)
+
+  # Helper function for printing events
+  def _print_event(event) -> None:
+    content = event.content
+    if not content or not content.parts:
+      return
+    text_parts = [part.text for part in content.parts if part.text]
+    if not text_parts:
+      return
+    author = event.author or 'system'
+    click.echo(f'[{author}]: {"".join(text_parts)}')
+
   if input_file:
     session = await run_input_file(
         app_name=session_app_name,
@@ -177,16 +205,22 @@ async def run_cli(
         input_path=input_file,
     )
   elif saved_session_file:
+    # Load the saved session from file
     with open(saved_session_file, 'r', encoding='utf-8') as f:
       loaded_session = Session.model_validate_json(f.read())
 
+    # Create a new session in the service, copying state from the file
+    session = await session_service.create_session(
+        app_name=session_app_name,
+        user_id=user_id,
+        state=loaded_session.state if loaded_session else None,
+    )
+
+    # Append events from the file to the new session and display them
     if loaded_session:
       for event in loaded_session.events:
         await session_service.append_event(session, event)
-        content = event.content
-        if not content or not content.parts or not content.parts[0].text:
-          continue
-        click.echo(f'[{event.author}]: {content.parts[0].text}')
+        _print_event(event)
 
     await run_interactively(
         agent_or_app,
@@ -196,6 +230,9 @@ async def run_cli(
         credential_service,
     )
   else:
+    session = await session_service.create_session(
+        app_name=session_app_name, user_id=user_id
+    )
     click.echo(f'Running agent {agent_or_app.name}, type exit to exit.')
     await run_interactively(
         agent_or_app,
@@ -207,9 +244,7 @@ async def run_cli(
 
   if save_session:
     session_id = session_id or input('Session ID to save: ')
-    session_path = (
-        f'{agent_parent_dir}/{agent_folder_name}/{session_id}.session.json'
-    )
+    session_path = agent_root / f'{session_id}.session.json'
 
     # Fetch the session again to get all the details.
     session = await session_service.get_session(
@@ -217,9 +252,9 @@ async def run_cli(
         user_id=session.user_id,
         session_id=session.id,
     )
-    with open(session_path, 'w', encoding='utf-8') as f:
-      f.write(
-          session.model_dump_json(indent=2, exclude_none=True, by_alias=True)
-      )
+    session_path.write_text(
+        session.model_dump_json(indent=2, exclude_none=True, by_alias=True),
+        encoding='utf-8',
+    )
 
     print('Session saved to', session_path)

src/google/adk/cli/fast_api.py

@@ -34,20 +34,19 @@ from opentelemetry.sdk.trace import TracerProvider
 from starlette.types import Lifespan
 from watchdog.observers import Observer
 
-from ..artifacts.in_memory_artifact_service import InMemoryArtifactService
 from ..auth.credential_service.in_memory_credential_service import InMemoryCredentialService
 from ..evaluation.local_eval_set_results_manager import LocalEvalSetResultsManager
 from ..evaluation.local_eval_sets_manager import LocalEvalSetsManager
-from ..memory.in_memory_memory_service import InMemoryMemoryService
 from ..runners import Runner
-from ..sessions.in_memory_session_service import InMemorySessionService
 from .adk_web_server import AdkWebServer
-from .service_registry import get_service_registry
 from .service_registry import load_services_module
 from .utils import envs
 from .utils import evals
 from .utils.agent_change_handler import AgentChangeEventHandler
 from .utils.agent_loader import AgentLoader
+from .utils.service_factory import create_artifact_service_from_options
+from .utils.service_factory import create_memory_service_from_options
+from .utils.service_factory import create_session_service_from_options
 
 logger = logging.getLogger("google_adk." + __name__)
 
@@ -74,6 +73,8 @@ def get_fast_api_app(
     logo_text: Optional[str] = None,
     logo_image_url: Optional[str] = None,
 ) -> FastAPI:
+  # Convert to absolute path for consistency
+  agents_dir = str(Path(agents_dir).resolve())
 
   # Set up eval managers.
   if eval_storage_uri:
@@ -91,48 +92,32 @@ def get_fast_api_app(
   # Load services.py from agents_dir for custom service registration.
   load_services_module(agents_dir)
 
-  service_registry = get_service_registry()
-
   # Build the Memory service
-  if memory_service_uri:
-    memory_service = service_registry.create_memory_service(
-        memory_service_uri, agents_dir=agents_dir
+  try:
+    memory_service = create_memory_service_from_options(
+        base_dir=agents_dir,
+        memory_service_uri=memory_service_uri,
     )
-    if not memory_service:
-      raise click.ClickException(
-          "Unsupported memory service URI: %s" % memory_service_uri
-      )
-  else:
-    memory_service = InMemoryMemoryService()
+  except ValueError as exc:
+    raise click.ClickException(str(exc)) from exc
 
   # Build the Session service
-  if session_service_uri:
-    session_kwargs = session_db_kwargs or {}
-    session_service = service_registry.create_session_service(
-        session_service_uri, agents_dir=agents_dir, **session_kwargs
-    )
-    if not session_service:
-      # Fallback to DatabaseSessionService if the service registry doesn't
-      # support the session service URI scheme.
-      from ..sessions.database_session_service import DatabaseSessionService
-
-      session_service = DatabaseSessionService(
-          db_url=session_service_uri, **session_kwargs
-      )
-  else:
-    session_service = InMemorySessionService()
+  session_service = create_session_service_from_options(
+      base_dir=agents_dir,
+      session_service_uri=session_service_uri,
+      session_db_kwargs=session_db_kwargs,
+      per_agent=True,  # Multi-agent mode
+  )
 
   # Build the Artifact service
-  if artifact_service_uri:
-    artifact_service = service_registry.create_artifact_service(
-        artifact_service_uri, agents_dir=agents_dir
+  try:
+    artifact_service = create_artifact_service_from_options(
+        base_dir=agents_dir,
+        artifact_service_uri=artifact_service_uri,
+        per_agent=True,  # Multi-agent mode
     )
-    if not artifact_service:
-      raise click.ClickException(
-          "Unsupported artifact service URI: %s" % artifact_service_uri
-      )
-  else:
-    artifact_service = InMemoryArtifactService()
+  except ValueError as exc:
+    raise click.ClickException(str(exc)) from exc
 
   # Build  the Credential service
   credential_service = InMemoryCredentialService()

src/google/adk/cli/utils/service_factory.py

@@ -0,0 +1,138 @@
+# Copyright 2025 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+from __future__ import annotations
+
+import logging
+from pathlib import Path
+from typing import Any
+from typing import Optional
+
+from ...artifacts.base_artifact_service import BaseArtifactService
+from ...memory.base_memory_service import BaseMemoryService
+from ...sessions.base_session_service import BaseSessionService
+from ..service_registry import get_service_registry
+from .local_storage import create_local_artifact_service
+
+logger = logging.getLogger("google_adk." + __name__)
+
+
+def create_session_service_from_options(
+    *,
+    base_dir: Path | str,
+    session_service_uri: Optional[str] = None,
+    session_db_kwargs: Optional[dict[str, Any]] = None,
+    per_agent: bool = False,
+) -> BaseSessionService:
+  """Creates a session service based on CLI/web options."""
+  base_path = Path(base_dir)
+  registry = get_service_registry()
+
+  kwargs: dict[str, Any] = {
+      "agents_dir": str(base_path),
+      "per_agent": per_agent,
+  }
+  if session_db_kwargs:
+    kwargs.update(session_db_kwargs)
+
+  if session_service_uri:
+    if per_agent:
+      logger.warning(
+          "per_agent is not supported with remote session service URIs,"
+          " ignoring"
+      )
+    logger.info("Using session service URI: %s", session_service_uri)
+    service = registry.create_session_service(session_service_uri, **kwargs)
+    if service is not None:
+      return service
+
+    # Fallback to DatabaseSessionService if the registry doesn't support the
+    # session service URI scheme. This keeps support for SQLAlchemy-compatible
+    # databases like AlloyDB or Cloud Spanner without explicit registration.
+    from ...sessions.database_session_service import DatabaseSessionService
+
+    fallback_kwargs = dict(kwargs)
+    fallback_kwargs.pop("agents_dir", None)
+    fallback_kwargs.pop("per_agent", None)
+    logger.info(
+        "Falling back to DatabaseSessionService for URI: %s",
+        session_service_uri,
+    )
+    return DatabaseSessionService(db_url=session_service_uri, **fallback_kwargs)
+
+  logger.info("Using in-memory session service")
+  from ...sessions.in_memory_session_service import InMemorySessionService
+
+  return InMemorySessionService()
+
+
+def create_memory_service_from_options(
+    *,
+    base_dir: Path | str,
+    memory_service_uri: Optional[str] = None,
+) -> BaseMemoryService:
+  """Creates a memory service based on CLI/web options."""
+  base_path = Path(base_dir)
+  registry = get_service_registry()
+
+  if memory_service_uri:
+    logger.info("Using memory service URI: %s", memory_service_uri)
+    service = registry.create_memory_service(
+        memory_service_uri,
+        agents_dir=str(base_path),
+    )
+    if service is None:
+      raise ValueError(f"Unsupported memory service URI: {memory_service_uri}")
+    return service
+
+  logger.info("Using in-memory memory service")
+  from ...memory.in_memory_memory_service import InMemoryMemoryService
+
+  return InMemoryMemoryService()
+
+
+def create_artifact_service_from_options(
+    *,
+    base_dir: Path | str,
+    artifact_service_uri: Optional[str] = None,
+    per_agent: bool = False,
+) -> BaseArtifactService:
+  """Creates an artifact service based on CLI/web options."""
+  base_path = Path(base_dir)
+  registry = get_service_registry()
+
+  if artifact_service_uri:
+    if per_agent:
+      logger.warning(
+          "per_agent is not supported with remote artifact service URIs,"
+          " ignoring"
+      )
+    logger.info("Using artifact service URI: %s", artifact_service_uri)
+    service = registry.create_artifact_service(
+        artifact_service_uri,
+        agents_dir=str(base_path),
+        per_agent=per_agent,
+    )
+    if service is None:
+      logger.warning(
+          "Unsupported artifact service URI: %s, falling back to in-memory",
+          artifact_service_uri,
+      )
+      from ...artifacts.in_memory_artifact_service import InMemoryArtifactService
+
+      return InMemoryArtifactService()
+    return service
+
+  if per_agent:
+    logger.info("Using shared file artifact service rooted at %s", base_dir)
+  return create_local_artifact_service(base_dir=base_path, per_agent=per_agent)