Lean MCP implementation

src/va_agent/config.py

@@ -0,0 +1,53 @@
+"""Configuration helper for ADK agent."""
+
+import os
+
+from pydantic_settings import (
+    BaseSettings,
+    PydanticBaseSettingsSource,
+    SettingsConfigDict,
+    YamlConfigSettingsSource,
+)
+
+CONFIG_FILE_PATH = os.getenv("CONFIG_YAML", "config.yaml")
+
+
+class AgentSettings(BaseSettings):
+    """Settings for ADK agent with vector search."""
+
+    google_cloud_project: str
+    google_cloud_location: str
+
+    # Agent configuration
+    agent_name: str
+    agent_instructions: str
+    agent_model: str
+
+    # Firestore configuration
+    firestore_db: str
+
+    # MCP configuration
+    mcp_remote_url: str
+
+    model_config = SettingsConfigDict(
+        yaml_file=CONFIG_FILE_PATH,
+        extra="ignore",  # Ignore extra fields from config.yaml
+    )
+
+    @classmethod
+    def settings_customise_sources(
+        cls,
+        settings_cls: type[BaseSettings],
+        init_settings: PydanticBaseSettingsSource,  # noqa: ARG003
+        env_settings: PydanticBaseSettingsSource,
+        dotenv_settings: PydanticBaseSettingsSource,  # noqa: ARG003
+        file_secret_settings: PydanticBaseSettingsSource,  # noqa: ARG003
+    ) -> tuple[PydanticBaseSettingsSource, ...]:
+        """Use env vars and YAML as settings sources."""
+        return (
+            env_settings,
+            YamlConfigSettingsSource(settings_cls),
+        )
+
+
+settings = AgentSettings.model_validate({})