Complete conditional check simplification in cloud_engineer_agent.py

[awsdataarchitect]

Summary

This PR completes the refactoring of redundant conditional checks in cloud_engineer_agent.py, building upon the changes from PR #6. It simplifies the tool loading logic by removing unnecessary null checks when mcp_initialized is False.

Requirements Implemented

Code Refactoring

• ✅ Simplified tool loading logic (lines 116-117): Changed from mcp_initialized and aws_docs_mcp_client to just mcp_initialized for both docs_tools and diagram_tools loading, since the MCP clients are guaranteed to be None when mcp_initialized is False
• ✅ Cleanup function simplification (already addressed in PR Fix MCP initialization error handling and enable graceful degradation #6): Simplified conditional checks in the cleanup() function from mcp_initialized and aws_docs_mcp_client to just mcp_initialized for both AWS Documentation and AWS Diagram MCP client cleanup logic

Previous Requirements (from PR #5 and #6)

• ✅ Fixed ImportError for mcp_initialized: The variable is properly defined at module level in cloud_engineer_agent.py and is accessible for import
• ✅ Added validation for required environment variables: Checks for AWS-related environment variables (AWS_REGION, AWS credentials) at application startup with clear error messages
• ✅ Implemented health check endpoint: Added for the Streamlit application with operational status and appropriate status indicators
• ✅ Improved error handling: Added graceful degradation when MCP clients fail to initialize

Changes Made

• Refactored docs_tools loading: Removed redundant aws_docs_mcp_client check
• Refactored diagram_tools loading: Removed redundant aws_diagram_mcp_client check
• Merged latest changes from main branch to ensure compatibility

Testing

• ✅ Code validated against Dockerfile at cloudeng-strands-agent/Dockerfile
• ✅ Simplified conditional logic maintains the same behavior as before
• ✅ MCP clients are only called when properly initialized

Technical Details

The refactoring is safe because:

1. When mcp_initialized is False, both aws_docs_mcp_client and aws_diagram_mcp_client are guaranteed to be None
2. The redundant null checks add no additional safety but increase code complexity
3. The simplified conditions are more readable and maintainable

Related PRs

• PR Fix MCP initialization error handling and enable graceful degradation #6: Initial cleanup function simplification
• PR Enhance application robustness: exception handling, environment validation, and health check endpoint #5: Environment validation and health check implementation
• PR Fix bare except clauses in app.py with specific exception handling #4: Previous improvements to the agent

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This PR addresses feedback from amazon-q-developer[bot] to complete the conditional check simplification throughout the codebase.

[amazon-q-developer]

Code Review Summary

This PR simplifies conditional checks in the tool loading logic by removing redundant null checks. While the current logic guarantees that MCP clients are non-null when mcp_initialized is True, the removed null checks serve as defensive programming against potential future changes to the initialization logic.

Key Finding

• Critical Issue: Removing the null checks creates a crash risk if the initialization logic changes in the future, potentially causing AttributeError when calling methods on None objects.

Recommendation

Retain the existing redundant checks for defensive programming and code robustness. The minimal performance impact is outweighed by the safety benefits.

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You can now have the agent implement changes and create commits directly on your pull request's source branch. Simply comment with /q followed by your request in natural language to ask the agent to make changes.

[amazon-q-developer]

🛑 Logic Error: Removing the null checks creates a potential crash risk. If mcp_initialized is True but the MCP clients are None (which could happen if the initialization logic changes in the future), this will cause an AttributeError when calling list_tools_sync() on None. The redundant checks provide defensive programming against future code changes.

Suggested change

	docs_tools = aws_docs_mcp_client.list_tools_sync() if mcp_initialized else []
	diagram_tools = aws_diagram_mcp_client.list_tools_sync() if mcp_initialized else []
	docs_tools = aws_docs_mcp_client.list_tools_sync() if mcp_initialized and aws_docs_mcp_client else []
	diagram_tools = aws_diagram_mcp_client.list_tools_sync() if mcp_initialized and aws_diagram_mcp_client else []

[awsdataarchitect]

/q work on the suggested changes

[kiro-agent]

Taking a look!

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_{Learn more}

[amazon-q-developer]

I'll implement the suggested changes to restore the defensive programming approach for MCP client null checks.

Changes to implement:
• Restore null checks for aws_docs_mcp_client in docs_tools loading (cloud_engineer_agent.py:116)
• Restore null checks for aws_diagram_mcp_client in diagram_tools loading (cloud_engineer_agent.py:117)

This will prevent potential AttributeError crashes if the initialization logic changes in the future while maintaining defensive programming practices.

[amazon-q-developer]

✅ Changes implemented successfully!

I've restored the defensive null checks for both MCP clients as suggested in the review. The code now includes proper null checks to prevent potential AttributeError crashes if the initialization logic changes in the future, maintaining robust defensive programming practices.

[kiro-agent]

I've started adding defensive null checks to the MCP client tool listing to prevent potential crashes.

[kiro-agent]

I'm performing final verifications and then I'll raise this for review.

[kiro-agent]

I've created a pull request for you to review:

• Complete conditional check simplification in cloud_engineer_agent.py #7

[kiro-agent]

Here's my updated plan. Let me know if you have any feedback on my plan or steps as I go.

STEP 8

• Investigate the MCP client initialization error reported in GitHub Issue Getting the following error when trying to run the cloud_engineer_agent.py directly #1
• The error occurs during MCP client initialization with the following characteristics:
  • Error message: "client failed to initialize unhandled errors in a TaskGroup (1 sub-exception)"
  • Exception traceback originates from: "...venv\Lib\site-packages\strands\tools\mcp\mcp_client.py"
  • This is an Exception Group error occurring during async TaskGroup execution
• Analyze the MCP client initialization code in cloud_engineer_agent.py to identify the root cause of the TaskGroup exception
• Review async initialization patterns and error handling in the MCP client setup
• Implement proper exception handling for the MCP client initialization to prevent TaskGroup exceptions from causing application failures
• Ensure graceful degradation if MCP clients fail to initialize (application should continue with MCP features disabled rather than crashing)
• Test the fix to verify the application handles MCP initialization failures without crashing
• Validate the code change using Dockerfile at location cloudeng-strands-agent/Dockerfile

STEP 9

• Create a pull request for the MCP client initialization TaskGroup error fix in cloudeng-strands-agent repository
• Include clear commit messages describing how the fix addresses GitHub Issue Getting the following error when trying to run the cloud_engineer_agent.py directly #1
• The PR description should reference GitHub Issue Getting the following error when trying to run the cloud_engineer_agent.py directly #1, explain the root cause of the TaskGroup exception, and describe the error handling improvements that prevent the application from crashing during MCP initialization failures
  I'm investigating and fixing the MCP client initialization TaskGroup error from GitHub Issue Getting the following error when trying to run the cloud_engineer_agent.py directly #1, analyzing the error handling in the async initialization process and implementing proper exception handling to prevent application crashes.

[kiro-agent]

I'm performing final verifications and then I'll raise this for review.

[kiro-agent]

I've created a pull request for you to review:

• Fix MCP Client Initialization Error Handling and Import Issues #8
  I've reviewed the conversation and existing requirements. The MCP client initialization TaskGroup error from GitHub Issue Getting the following error when trying to run the cloud_engineer_agent.py directly #1 is already being addressed:

STEP 8 (R008 - Already delegated)

• Investigate the MCP client initialization error reported in GitHub Issue Getting the following error when trying to run the cloud_engineer_agent.py directly #1
• The error occurs during MCP client initialization with the following characteristics:
  • Error message: "client failed to initialize unhandled errors in a TaskGroup (1 sub-exception)"
  • Exception traceback originates from: "...venv\Lib\site-packages\strands\tools\mcp\mcp_client.py"
  • This is an Exception Group error occurring during async TaskGroup error
• Analyze the MCP client initialization code in cloud_engineer_agent.py to identify the root cause of the TaskGroup exception
• Review async initialization patterns and error handling in the MCP client setup
• Implement proper exception handling for the MCP client initialization to prevent TaskGroup exceptions from causing application failures
• Ensure graceful degradation if MCP clients fail to initialize (application should continue with MCP features disabled rather than crashing)
• Test the fix to verify the application handles MCP initialization failures without crashing
• Validate the code change using Dockerfile at location cloudeng-strands-agent/Dockerfile

STEP 9 (R009 - Already delegated)

• Create a pull request for the MCP client initialization TaskGroup error fix in cloudeng-strands-agent repository
• Include clear commit messages describing how the fix addresses GitHub Issue Getting the following error when trying to run the cloud_engineer_agent.py directly #1
• The PR description should reference GitHub Issue Getting the following error when trying to run the cloud_engineer_agent.py directly #1, explain the root cause of the TaskGroup exception, and describe the error handling improvements that prevent the application from crashing during MCP initialization failures

These requirements are currently in progress. No updates to the requirements are needed at this time.