fix: expense reimbursement sample agent env var reference and function parsing errors (#286)

* #212 fix typo in README.md related to LiteLLM env var reqs

* #212 fix runtime issue related to dynamic functions param parsing - google/adk-python#1634

* #212 update dependencies for expense reimbursement sample

* #212 fix reference to env var

Author: dvmorris

samples/python/agents/adk_expense_reimbursement/README.md

@@ -21,7 +21,7 @@ This agent takes text requests from the client and, if any details are missing,
 2. Create an environment file with your API key:
 
    ```bash
-   echo "GOOGLE_API_KEY=your_api_key_here" > .env
+   echo "GEMINI_API_KEY=your_api_key_here" > .env
    ```
 
 3. Run an agent:

samples/python/agents/adk_expense_reimbursement/__main__.py

@@ -33,9 +33,9 @@ def main(host, port):
     try:
         # Check for API key only if Vertex AI is not configured
         if not os.getenv('GOOGLE_GENAI_USE_VERTEXAI') == 'TRUE':
-            if not os.getenv('GOOGLE_API_KEY'):
+            if not os.getenv('GEMINI_API_KEY'):
                 raise MissingAPIKeyError(
-                    'GOOGLE_API_KEY environment variable not set and GOOGLE_GENAI_USE_VERTEXAI is not TRUE.'
+                    'GEMINI_API_KEY environment variable not set and GOOGLE_GENAI_USE_VERTEXAI is not TRUE.'
                 )
 
         capabilities = AgentCapabilities(streaming=True)

samples/python/agents/adk_expense_reimbursement/agent.py

@@ -1,6 +1,7 @@
 import json
 import os
 import random
+from typing import Optional
 
 from collections.abc import AsyncIterable
 from typing import Any
@@ -20,9 +21,9 @@
 
 
 def create_request_form(
-    date: str | None = None,
-    amount: str | None = None,
-    purpose: str | None = None,
+    date: Optional[str] = None,
+    amount: Optional[str] = None,
+    purpose: Optional[str] = None,
 ) -> dict[str, Any]:
     """Create a request form for the employee to fill out.
 
@@ -49,7 +50,7 @@ def create_request_form(
 def return_form(
     form_request: dict[str, Any],
     tool_context: ToolContext,
-    instructions: str | None = None,
+    instructions: Optional[str] = None,
 ) -> dict[str, Any]:
     """Returns a structured json object indicating a form to complete.
 

samples/python/agents/adk_expense_reimbursement/pyproject.toml

@@ -3,12 +3,12 @@ name = "a2a-sample-agent-adk"
 version = "0.1.0"
 description = "Sample Google ADK-based Expense Reimbursement agent hosted as an A2A server." 
 readme = "README.md"
-requires-python = ">=3.12"
+requires-python = ">=3.13"
 dependencies = [
     "a2a-sdk>=0.2.16",
     "click>=8.1.8",
-    "google-adk>=1.0.0",
-    "google-genai>=1.9.0",
+    "google-adk>=1.8.0",
+    "google-genai>=1.27.0",
     "python-dotenv>=1.1.0",
     "litellm",
 ]