fix: address code review feedback

- Fix model name to gemini-2.5-flash
- Remove redundant sardis_tool.py, consolidate into __init__.py
- Include sardis_check_policy in usage example

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: EfeDurmaz16

tools/sardis/README.md

@@ -24,7 +24,7 @@ from google.adk.agents import Agent
 from tools.sardis import sardis_pay, sardis_check_balance, sardis_check_policy
 
 agent = Agent(
-    model="gemini-2.0-flash",
+    model="gemini-2.5-flash",
     name="payment_agent",
     description="An agent that can make policy-controlled payments",
     tools=[sardis_pay, sardis_check_balance, sardis_check_policy],

tools/sardis/__init__.py

@@ -1,4 +1,21 @@
-"""Sardis payment tools for Google ADK agents."""
+"""Sardis payment tools for Google ADK agents.
+
+This module enables ADK agents to make policy-controlled payments through
+Sardis non-custodial MPC wallets.
+
+Installation:
+    pip install sardis-adk
+
+Usage:
+    from tools.sardis import sardis_pay, sardis_check_balance, sardis_check_policy
+
+    # Use in an ADK agent
+    agent = Agent(
+        model="gemini-2.5-flash",
+        name="payment_agent",
+        tools=[sardis_pay, sardis_check_balance, sardis_check_policy],
+    )
+"""
 
 from sardis_adk.tools import (
     sardis_pay,