docs/walkthrough.md

# Walkthrough - Fraud Assistant Workflow Pattern

I have successfully transitioned the **Fraud Model Explainability Assistant** to a structured **Workflow Pattern**. This change improves determinism, auditability, and reliability by forcing explicit steps for Intent Analysis, Tool Execution, and Response Generation.

## Changes

### 1. New Workflow Engine ([workflow.py](file:///Users/christiancontrerascampana/Desktop/GitHub/syf/fraud_model_explainability_assistant/workflow.py))
I created a new `FraudExplainabilityWorkflow` class that orchestrates the conversation:
- **State Management**: Uses a `WorkflowState` TypedDict to track input, intent, tool calls, and results.
- **Intent Analysis**: Explicitly plans which tools to call using an LLM router.
- **Tool Execution**: Systematically executes tools and catches errors per tool.
- **Async Wrapper**: Implemented specific `async/await` methods for all workflow steps to ensure compatibility with `uvicorn` and `uvloop`, replacing the initial synchronous design.

### 2. Application Integration ([app.py](file:///Users/christiancontrerascampana/Desktop/GitHub/syf/fraud_model_explainability_assistant/app.py))
- Replaced the legacy `Agent` loop with the new `FraudExplainabilityWorkflow`.
- Added robust dependency handling for `confluence-ingestor` to allow the app to run in lighter environments.

### 3. Verification Script ([test_workflow.py](file:///Users/christiancontrerascampana/Desktop/GitHub/syf/fraud_model_explainability_assistant/test_workflow.py))
- Created a standalone test script to verify the workflow without needing the full web server.

## Verification Results

### Test Case: "Why was application APP-78432 flagged as high risk?"

The workflow successfully:
1.  **Analyzed Intent**: Determined it needed to fetch application summary, fraud score explanation, population comparison, and risk indicators.
2.  **Executed Tools**:
    - `get_application_summary`
    - `explain_fraud_score`
    - `compare_to_population`
    - `check_fair_lending_flags`
    - `get_identity_network`
3.  **Generated Response**: Synthesized all data into a comprehensive explanation.

**Log Output:**
```log
INFO | workflow | Intent: Analyze why application APP-78432 was flagged..., Tools: 5
INFO | workflow | Executing get_application_summary with {'application_id': 'APP-78432'}
INFO | workflow | Executing explain_fraud_score with {'application_id': 'APP-78432'}
...
INFO | app | Query completed successfully
```

### Architecture Comparison

| Feature | Old Agent | New Workflow |
| :--- | :--- | :--- |
| **Control Flow** | Implicit (LLM decides loop) | Explicit (Code defines steps) |
| **Auditability** | Hard (Mixed logs) | Easy (Structured State logs) |
| **Robustness** | error-prone tool loops | Per-step error handling |
| **Dependencies** | Loose | Managed & Robust |

## Next Steps
- The `app.py` is now ready for deployment with the new architecture.
- You can extend the `WorkflowState` to include user feedback or "Human-in-the-loop" approval steps easily in the future.