git-ai

git-ai

Save your prompts and keep track of code generated by AI.

curl -sSL https://gitai.run/install.sh | bash

git blame src/log_fmt_authorship.rs

https://github.com/user-attachments/assets/74b49493-92af-4627-934a-a3c161dbb49f

Install

git-ai is implimented as a git proxy. It passes commands, args and flags to your git binary. You and your IDEs won’t notice the difference, but all your code will be annotated with AI Authorship.

curl -sSL https://gitai.run/install.sh | bash

Recommended: add an alias git=git-ai to your shell config

Alternative (more flaky): update your IDEs and SCM GUI tool’s git paths to bin/git-ai and favor git-ai over git when running commmands you manually.

Agent Setup

Supported:

[x] Cursor via Extension. Source and documentation are here

[x] Claude Code via Hooks

Help needed:

[ ] Sourcegraph Cody + Amp

[ ] OpenAI Codex

[ ] Windsurf

[ ] RovoDev CLI …your tool

Want to add yours? All PRs welcome! Add documentation or plugin code to /agent-support/{tool-name}.md

Manually:

If you want to manually mark code as written by you or your agent.

Before submitting your prompt run checkpoint to attribute any new working copy changes to yourself.

git-ai checkpoint

After the AI has applied its changes, run checkpoint with the name of the agent you’re using. This will apply the latest (generated) working copy changes to the agent.

git-ai checkpoint --author "Claude Code"

Why git-ai?

git blame attributes all code to the commit’s author, even when much of it is AI-generated.

⭐️Git-native - enhanced authorship is stored in Git and linked to commit hashes.

🫡Simple and explicit - no file system monitors, keyloggers or batch-write heuristics. Supported Agents call git-ai checkpoint --author "Claude Code" --model claude-4-sonnet after writing code.

🤞Emerging Standard - developers have tool choice, and they’re likely using a mix of Claude Code, Codex, Cursor, etc.

⚡️Fast + Cross Platform - implemented in Rust, as fast as git status, and built on libgit2

How it works

git-ai uses checkpoints to establish authorship of specific lines of code. Agents call git-ai checkpoint before they write to the file system to mark any previous edits as yours. After they write to the file system they call checkpoint --author 'Claude Code' --model 'claude-4-sonnet' to mark their contribution as AI-generated. These checkpoints work similarly to how IDEs handle local history and they do not leave your machine.

When you commit code, the base commit’s checkpoints are compacted into a much smaller authorship log that is linked to your commit.

For toolbuilders

The Standard (draft-1)

Authorship logs, attached to commits, pushed to the refs/ai/authorship as blob objects.

• Authorship logs MUST be named refs/ai/authorship/{commit-sha}. MUST be the full SHA
• Authorship logs SHOULD be saved for every commit, but implementations MUST not fail if they are not provided.
• Authorship logs MUST be a valid JSON object with the following properties:
  • schema_version MUST use semantic versioning. Options: authorship/0.0.1
  • files MUST be a map of git file names -> authors[]
    • author MUST be a string. Agents SHOULD use their full name. Human developers SHOULD use their git.config.name
    • lines MUST be an array of added lines. Items MUST be an integer or a range tuple [start-int, end-int]. Range MUST be inclusive.
    • agent_metadata
      • SHOULD be null for humans
      • SHOULD be an object for agents
        • MUST have model (a string), that SHOULD be the model’s name as it is provided to the API (ie claude-4-sonnet, not Claude 4, Sonnet).
        • MAY have any other properties of any other type.

```json file=”refs/ai/authorship/f46b403b4f269bd2530b2d91a676449787886d02” { “schema_version”: “authorship/0.0.1”, “files”: { “src/main.rs”: { “file”: “src/main.rs”, “authors”: [ { “author”: “Claude Code”, “lines”: [12, [91, 101]], “agent_metadata”: { “model”: “claude-4-sonnet” } }, { “author”: “Aidan Cunniffe”, “lines”: [57], “agent_metadata”: null } ] } } }

**Coming next**: Prompt saving that maintains pointers to specific lines of code, across files.

### Adding Support to Your Agents

#### Via User-Installed CLI (Recommended)

Adding `git-ai` support to a coding agent is easy. You just have to call `git-ai checkpoint` once before writing to the file system and once immediately after your writes have completed. The `checkpoint` command has similar performance to `git status` and will not noticeably slow down your Agent's performance (we're talking ~100ms).

**Requirements:**

- Agents SHOULD check if `git-ai` is installed when they start and only try to log checkpoints if the user has it installed.
- Agents SHOULD write checkpoints to every git repo if the user has git-ai installed, no opt-in needed.
- Agents MUST only call `git-ai checkpoint` command from within a git repo. At the root or any sub directory will work.
- Agents MUST call `git-ai checkpoint` and wait for the command to finish before writing to the file system.
- Agents MUST call `git-ai checkpoint` immediately after writing generated code to the file system.
- Agents SHOULD not try to handle errors from the checkpoint command. Log them to the user to encourage them to fix or uninstall tool if it persists.

#### Via Rust Library

If you want to call `git-ai checkpoint` using a packaged rust binary and bindings, open an issue with runtime, language, and other details so we can provide the exact bindings you need. We'll provide a function like this that will run checkpoint without the CLI overhead.

**Note**: We suggest you adopt the CLI approach first, help make this a standard by providing great feedback, and then set up the deeper integration.

```rust
pub fn checkpoint_internal(
    repo_path: &str,
    author: &str,
    model: Option<&str>,
    human_author: Option<&str>,
) -> Result<(usize, usize, usize), GitAiError>

Known limitiaitons

• Authorship logs will not survive a rebase. Possible, but requires merging authorship logs in a post-rewrite hook.

Development Setup

git clone https://github.com/acunniffe/git-ai.git
cd git-ai
cargo build
cargo test

License

MIT