Graflow Workflow

Graflow Workflow Builder

Build executable task graphs in Python using a structured 3-phase approach.

Workflow: Plan -> Implement -> Review

Phase 1: Plan

Goal: Clarify requirements, create a design document, and get user approval through iterative feedback.

Steps:

Step 1: Requirements Gathering

Ask the user clarifying questions about the workflow:

• What is the workflow's purpose?
• What are the input sources and output destinations?
• Which tasks need to run sequentially vs. in parallel?
• Is LLM integration needed?
• Are there any dynamic/conditional branching requirements?

Step 2: Create Design Document

Create a design document (workflow_design.md) with:

• Workflow overview and purpose
• Task definitions (name, responsibility, inputs/outputs)
• Task graph structure (ASCII diagram)
• Channel data flow
• Error handling strategy

Design Document Template:

# Workflow Design: {workflow_name}

## Overview
{Brief description of what this workflow accomplishes}

## Tasks

| Task ID | Responsibility | Inputs | Outputs |
|---------|---------------|--------|---------|
| task_a  | ...           | ...    | ...     |

## Task Graph

source >> (transform_a | transform_b) >> sink

## Channel Data Flow
- `config`: Set by setup, used by all tasks
- `results`: Accumulated by each task

## Error Handling
- {Strategy: fail-fast, best-effort, retry, etc.}

Step 3: Present Design to User

Present the design document to the user with a clear summary:

• Show the task graph diagram
• Highlight key design decisions
• Ask explicitly: "Does this design meet your requirements? Please provide feedback if any changes are needed."

Step 4: Iterate on Feedback

If the user provides feedback:

1. Update workflow_design.md with the requested changes
2. Summarize the changes made
3. Re-present the updated design
4. Repeat until the user is satisfied

Step 5: Confirm Design Approval

Before proceeding to implementation:

• Ask the user to confirm: "Is this design approved? If yes, I'll proceed to implementation."
• Only move to Phase 2 after explicit approval

Phase 2: Implement

Goal: Write the workflow code based on the approved design.

Steps:

1. Create the workflow file following the design document
2. Use appropriate Graflow patterns (see references/workflow-patterns.md)
3. Add type hints and docstrings

Implementation Checklist:

• Import statements
• Task definitions with @task decorator
• Workflow context with workflow() context manager
• Task composition with >> and | operators
• Channel usage for inter-task communication
• Entry point (if __name__ == "__main__")

Phase 3: Review

Goal: Validate the implementation against the design and create documentation.

Step 1: Implementation Review

Review Checklist:

• All tasks from design are implemented
• Task graph matches the design diagram
• Channel data flow is correct
• Error handling is in place
• Code follows Graflow conventions
• Type hints are present
• Docstrings explain task purpose

Common Issues to Check:

• Missing inject_context=True when accessing channels
• Incorrect parameter priority (channel < bound < injection)
• Missing set_group_name() for parallel groups
• Incorrect execution entry point

Step 2: Create README.md

After implementation is complete, create a README.md in the workflow directory with:

README Template:

# {Workflow Name}

## Overview
{Brief description of what this workflow does and its use cases}

## Requirements
- Python 3.11+
- Graflow
- {Additional dependencies}

## Usage

### Basic Execution
```bash
PYTHONPATH=. uv run python {workflow_file}.py

With Custom Parameters

from {workflow_module} import run_workflow

result = run_workflow(param1="value1", param2="value2")

Workflow Structure

Task Graph

{ASCII representation of task graph}

Tasks

Channel Data Flow

Configuration

{Description of configurable parameters and environment variables}

Examples

{Usage examples with expected output}

#### Step 3: Final Presentation

Present the completed workflow to the user:
- Summarize what was implemented
- Show the README.md content
- Confirm the workflow is ready for use

## Quick Reference

### Core Imports
```python
from graflow.core.decorators import task
from graflow.core.workflow import workflow
from graflow.core.context import TaskExecutionContext
from graflow.core.task import parallel

Task Patterns

# Simple task
@task
def process() -> str:
    return "done"

# Task with context injection
@task(inject_context=True)
def with_channel(ctx: TaskExecutionContext):
    ctx.get_channel().set("key", "value")

# Task with LLM client
@task(inject_llm_client=True)
def with_llm(llm_client: LLMClient):
    return llm_client.completion_text(messages=[...])

# Task instance with bound parameters
task1 = process(task_id="task1", value=10)

Composition Operators

a >> b           # Sequential: a then b
a | b            # Parallel: a and b concurrently
(a | b) >> c     # Fan-in: c waits for both a and b
a >> (b | c)     # Fan-out: b and c start after a

References

• Detailed patterns: See references/workflow-patterns.md
• Advanced patterns: See references/advanced-patterns.md

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