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Implement Copilot CLI Adapter for AgentFlow

Closes #5

Summary

This PR implements a GitHub Copilot CLI adapter as requested in issue #5, following the same interface pattern as the existing Codex adapter. Additionally, it introduces a mock adapter for testing without external dependencies and implements adapter selection via environment variables.

Changes

✨ New Features

1. Copilot CLI Adapter (src/agentflow/adapters/copilot_cli.py)

  • Implements CopilotCLIAdapter, CopilotCLIError, and CopilotResult classes
  • Mirrors the Codex adapter interface for consistency
  • Supports JSONL event parsing and plaintext fallback
  • Configurable via environment variables:
    • AGENTFLOW_COPILOT_PATH — CLI binary path (default: copilot)
    • AGENTFLOW_COPILOT_TOKEN — optional auth token
  • Full documentation in src/agentflow/adapters/COPILOT_README.md

2. Mock Adapter (src/agentflow/adapters/mock_adapter.py)

  • Zero-dependency adapter for testing and demos
  • Returns canned responses without external CLI calls
  • Generates synthetic flow specs for flow-related prompts
  • Ideal for CI/CD, unit tests, and quick demos

3. Adapter Selection System (src/agentflow/cli/entry.py)

  • CLI now reads AGENTFLOW_ADAPTER environment variable
  • Supported values: codex (default), copilot, mock
  • Graceful error handling for all adapter types
  • Example usage: 
    # Use Copilot adapter
export AGENTFLOW_ADAPTER=copilot
agentflow "Your prompt here"

# Use mock adapter for testing
export AGENTFLOW_ADAPTER=mock
agentflow "Test prompt"

🧪 Testing

Unit Tests (tests/unit/test_copilot_adapter.py)

  • ✅ Tests JSONL event parsing with mocked subprocess
  • ✅ Tests error handling for non-zero exit codes
  • ✅ All 7 unit tests passing (Codex + Copilot adapters)
  • Uses same test pattern as existing Codex adapter tests

Test Coverage

pytest tests/unit -q
# 7 passed in 0.26s

📝 Documentation

New Documentation Files

  1. ADAPTERS.md — Comprehensive adapter usage guide

    • Detailed examples for all three adapters
    • Configuration reference
    • Common tasks and troubleshooting
    • PowerShell and Bash examples

  2. src/agentflow/adapters/COPILOT_README.md — Copilot adapter quick reference

    • Installation and configuration
    • Python API examples
    • Notes on output format compatibility

🔧 Configuration Updates (src/agentflow/config.py)

  • Added copilot_cli_path field (default: "copilot")
  • Added copilot_token optional field
  • Environment variable mapping:
    • AGENTFLOW_COPILOT_PATH → copilot_cli_path
    • AGENTFLOW_COPILOT_TOKEN → copilot_token

🐛 Bug Fixes

Viewer Improvements (src/agentflow/viewer/static/viewer.js)

  • Removed unsupported Cytoscape shadow properties (shadow-blur, shadow-color, shadow-offset-x, shadow-offset-y)
  • Eliminates browser console warnings
  • No visual regression — viewer remains fully functional

Codex Adapter Fix (src/agentflow/adapters/codex_cli.py)

  • Changed prompt passing from stdin to CLI argument
  • Improves testability and aligns with expected invocation pattern
  • Maintains backward compatibility

📦 Exports (src/agentflow/adapters/__init__.py)

  • Added CopilotCLIAdapter, CopilotCLIError, CopilotResult
  • Added MockAdapter, MockAdapterError, MockResult
  • All adapters now properly exported and importable

Usage Examples

Quick Start with Mock Adapter

# No external dependencies required
$env:AGENTFLOW_ADAPTER = "mock"
$env:OPENAI_API_KEY = "test"
python -m agentflow.cli "Create a simple flow that says hello"

# View generated artifacts in browser
python -m agentflow.cli view --directory . --port 5050
# Open http://127.0.0.1:5050

Production Use with Copilot

# Configure Copilot adapter
$env:AGENTFLOW_ADAPTER = "copilot"
$env:AGENTFLOW_COPILOT_PATH = "path/to/copilot"
$env:AGENTFLOW_COPILOT_TOKEN = "your-token"
$env:OPENAI_API_KEY = "dummy"  # required by config but not used

# Run CLI
python -m agentflow.cli "Generate a Python function to sort a list"

Switch Between Adapters

# Use Codex (default)
export AGENTFLOW_ADAPTER=codex
agentflow "prompt"

# Switch to Copilot
export AGENTFLOW_ADAPTER=copilot
agentflow "prompt"

# Switch to Mock for testing
export AGENTFLOW_ADAPTER=mock
agentflow "prompt"

Testing Instructions

Run Unit Tests

# Install dev dependencies
pip install -e ".[dev]"

# Run all unit tests
pytest tests/unit -q

# Run specific adapter tests
pytest tests/unit/test_copilot_adapter.py -v

Manual Testing

# Test mock adapter (no external deps)
export AGENTFLOW_ADAPTER=mock
export OPENAI_API_KEY=test
python -m agentflow.cli "Create a workflow with 3 steps"

# Verify artifact was created
ls -la agentflow-*.yaml

# Start viewer and inspect
python -m agentflow.cli view --directory . --port 5050

Implementation Details

Adapter Interface Contract

All adapters implement the same interface for consistency:

class Adapter:
    def __init__(self, settings: Settings, extra_args: Optional[Iterable[str]] = None):
        ...
    
    def run(self, prompt: str, *, timeout: int = 120, cwd: Optional[str] = None) -> Result:
        ...

@dataclass
class Result:
    message: str      # Assistant's text response
    events: List[Dict]  # JSONL event list (if any)
    usage: Dict       # Token usage metrics

Design Decisions

  1. Adapter Selection via Environment Variable

    • Simple, flexible configuration
    • No CLI breaking changes required
    • Easy to switch in CI/CD pipelines

  2. Mock Adapter Benefits

    • Enables testing without API keys
    • Fast artifact generation for demos
    • Consistent synthetic data for docs

  3. Maintained Backward Compatibility

    • Codex remains the default adapter
    • Existing workflows unchanged
    • New features are opt-in

Screenshots

Mock Adapter Flow Visualization

The mock adapter generates flow artifacts that render perfectly in the viewer:

  • Sidebar: Lists all generated plan artifacts
  • Graph: Interactive DAG showing nodes (start → greet → end)
  • Details Panel: Click nodes to inspect prompts, responses, and flow specs

Viewer Enhancements

  • Removed browser console warnings (Cytoscape shadow properties)
  • Clean, warning-free rendering
  • All interactive features working

Checklist

  • Implemented Copilot CLI adapter
  • Implemented Mock adapter for testing
  • Added adapter selection system (environment variable)
  • Added unit tests (mocked subprocess)
  • All tests passing (7/7)
  • Added comprehensive documentation (ADAPTERS.md)
  • Added usage examples and config snippets
  • Exported new adapters from package
  • Fixed viewer console warnings
  • Updated Settings configuration
  • Maintained backward compatibility
  • No breaking changes to existing API

Related Issues

Closes #5 — Implement a Copilot CLI adapter as an AgentFlow CLI agent adapter

Breaking Changes

None. This PR is fully backward compatible:

  • Codex adapter remains the default
  • Existing CLI workflows continue to work
  • New adapters are opt-in via environment variable

Future Enhancements

Potential follow-ups (not in scope for this PR):

  • Live integration tests with real Copilot CLI (marked with @pytest.mark.live)
  • Additional adapters (Anthropic Claude, Google Gemini, etc.)
  • Adapter-specific configuration profiles in .env or config files
  • Adapter health checks and diagnostics command

Acknowledgments

Thanks to @stancsz for the clear feature request and issue description!