DiffSage

An AI-aware Git workflow toolkit for developers, automation, and AI agents.

DiffSage is a modern command-line toolkit that enhances Git workflows with AI while keeping Git as the single source of truth. Rather than replacing Git or competing with AI coding assistants, DiffSage provides a reliable, structured interface that helps developers and automation execute Git workflows consistently.

Why DiffSage?

AI coding assistants have dramatically improved code generation, but Git workflows still require reliable execution, proper validation, and consistent handling of repository state.

Today, developers often rely on:

• Manual Git commands
• Shell scripts
• AI-generated terminal commands
• Ad-hoc automation

Each approach solves part of the problem but leaves Git workflow logic scattered across tools.

DiffSage centralizes that logic into a single toolkit.

Instead of reinventing Git operations in every script or AI workflow, developers and automation can invoke DiffSage commands that handle repository validation, Git interactions, AI integration, and workflow execution through a consistent interface.

Philosophy

DiffSage is built around several core principles.

Git remains the source of truth

DiffSage builds on top of Git.

It never replaces Git.

Every operation ultimately delegates to Git while providing a safer and more consistent developer experience.

AI assists — it doesn't control

Artificial intelligence enhances Git workflows by generating suggestions, summaries, and explanations.

The developer always retains the final decision.

Reliability over cleverness

Predictable workflows are more valuable than overly complex automation.

Every feature should prioritize correctness, validation, and graceful failure.

Designed for automation

DiffSage is designed to be consumed by:

• Developers
• Automation scripts
• AI agents

Each consumer interacts through the same consistent interface.

Features

Current capabilities include:

• AI-assisted Conventional Commit generation
• Interactive commit workflow
• Commit message editing using the user's preferred editor
• Commit message regeneration
• Global, local, and resolved configuration management
• Git repository validation
• Environment diagnostics via diffsage doctor
• Provider abstraction for AI integrations
• Provider credential management with named profiles
• AI provider authentication and error handling
• Layered architecture
• Comprehensive automated test suite

What DiffSage Is

DiffSage is:

• An AI-aware Git workflow toolkit
• A command-line application
• Git-first
• Automation-friendly
• Extensible through a layered architecture
• Designed for both developers and AI-driven workflows

What DiffSage Is Not

DiffSage is not:

• A Git replacement
• A code editor
• A chatbot
• A code generation platform
• A project management tool
• An IDE replacement
• A general-purpose AI assistant

Its scope is intentionally focused on improving Git workflows.

Project Status

Current Stage: Active Development

DiffSage is currently under active development.

The project is being developed privately while the core architecture, documentation, and workflow foundation are finalized.

The long-term goal is to open source the project once it reaches a stable and well-documented foundation.

Installation

Clone the repository:

git clone <repository-url>
cd DiffSage

Create a virtual environment:

python -m venv .venv

Activate it:

macOS / Linux

source .venv/bin/activate

Windows

.venv\Scripts\activate

Install the project:

pip install -e ".[dev]"

Configuration

DiffSage supports layered configuration through global and repository-local TOML files.

Application configuration controls how DiffSage behaves and can be managed through global, repository-local, and environment-based configuration.

Provider credentials are managed separately from application configuration. Provider credentials are managed separately from application configuration and are not part of the Settings configuration model.

DIFFSAGE_PROVIDER=gemini
DIFFSAGE_AI_MODEL=gemini-3.5-flash-lite
DIFFSAGE_LOG_LEVEL=INFO
DIFFSAGE_TIMEOUT=60
DIFFSAGE_MAX_RETRIES=3

Configuration can also be managed directly from the CLI:

diffsage config list
diffsage config get provider
diffsage config set provider gemini
diffsage config unset provider

Quick Start

Set up your provider credential:

diffsage auth set gemini YOUR_API_KEY

Verify your environment:

diffsage doctor

View the current configuration:

diffsage config list

Ask the configured AI provider a question:

diffsage ask "Explain the current staged changes"

Generate a commit message:

diffsage commit

Interactive workflow:

Generate commit message
        │
        ▼
Display AI suggestion
        │
        ▼
[Y] Commit
[E] Edit
[R] Regenerate
[N] Cancel

Named credential profiles are also supported:

diffsage auth set gemini YOUR_API_KEY --name paid

View configured credentials:

diffsage auth list
diffsage auth get gemini

Remove a credential:

diffsage auth unset gemini

Commands

More commands will be introduced as the project evolves.

Architecture Overview

DiffSage follows a layered architecture to separate responsibilities and improve maintainability.

CLI
│
▼
Commands
│
├── Configuration
│
├── Authentication
│
▼
Services
│
├── Git
├── AI
├── Prompt Generation
└── Credentials
│
▼
Providers / Storage

Key architectural principles include:

• Single Responsibility Principle
• Separation of concerns
• Dependency inversion
• Provider abstraction
• Testability
• Extensibility

Detailed documentation is available under the docs/ directory.

Project Structure

src/
└── diffsage/
    ├── commands/
    ├── config/
    ├── exceptions/
    ├── git/
    ├── logging/
    ├── models/
    ├── parsers/
    ├── prompts/
    ├── providers/
    ├── services/
    ├── storage/
    └── ui/

tests/

docs/

Documentation

Additional project documentation is available within the repository.

Future documentation will include:

• Contributing Guide

Roadmap

The long-term roadmap focuses on strengthening Git workflows rather than expanding into unrelated developer tooling.

Planned capabilities include:

• Pull request generation
• Branch naming assistance
• Merge assistance
• Repository summaries
• Git workflow automation
• Machine-readable output for automation
• Additional AI provider integrations

Every planned feature must satisfy the project's mission:

Improve Git workflows while making them more reliable and easier to automate.

AI-Agent Compatibility

DiffSage is designed to work equally well for humans and automation.

Instead of requiring every automation tool or AI agent to implement Git workflow logic independently, DiffSage provides a reusable interface that encapsulates:

• Repository validation
• Git operations
• AI integration
• Workflow execution
• Error handling

This allows developers, scripts, and AI-driven workflows to interact with Git through a consistent, well-defined toolkit.

DiffSage does not replace AI coding assistants.

Instead, it complements them by providing reliable Git workflow capabilities.

Design Principles

Every feature in DiffSage should satisfy the following principles:

• Strengthen Git workflows
• Improve workflow reliability
• Simplify automation
• Preserve human control
• Maintain architectural consistency

Features that fall outside these principles intentionally remain out of scope.

Contributing

Contribution guidelines will be published when the project becomes publicly available.

Future contributors will be encouraged to review:

• Architecture documentation
• Coding conventions
• ADRs

before submitting changes.

License

This project is licensed under the MIT License.

See the LICENSE file for details.