agentdiff — Know What Every AI Agent Wrote

Line-level attribution for AI-assisted code. Audit every agent, model, and prompt across your entire git history.

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agentdiff hooks into every major AI coding agent — Claude Code, Cursor, Codex, Copilot, Windsurf, OpenCode, Gemini — and writes a permanent, commit-scoped attribution record to your repository. Each record captures the agent name, model, prompt excerpt, and exact line ranges. All of it queryable from the CLI, no server required.

agentdiff stats

  Total lines tracked: 4,231

  By Agent:
    claude-code   2,741 (65%) ████████████████████
    cursor          973 (23%) ███████
    copilot         353  (8%) ███
    human           164  (4%) █

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Install

curl -fsSL https://raw.githubusercontent.com/codeprakhar25/agentdiff/master/install.sh | bash

Other install methods

# Specific version
curl -fsSL https://raw.githubusercontent.com/codeprakhar25/agentdiff/master/install.sh | bash -s -- --version v0.1.0

# From source (requires Rust 1.85+)
cargo install --git https://github.com/codeprakhar25/agentdiff agentdiff

Requirements: Python 3.7+ on PATH, Git 2.20+

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Quick Start

# 1. Configure global agent hooks — run once per machine
agentdiff configure

# 2. Initialize a repository
cd ~/your-project
agentdiff init

# 3. Work normally — make AI-assisted edits, then commit
git add . && git commit -m "feat: add feature"

# 4. Inspect attribution
agentdiff list
agentdiff blame src/main.rs
agentdiff stats

That's it. From here every commit is attributed to whichever agent (or human) wrote it.

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Commands

Command	Description
agentdiff configure	Install global agent hooks — run once per machine
agentdiff init	Initialize tracking in current repository
agentdiff list	List attribution entries
agentdiff blame <file>	Line-level attribution, like git blame
agentdiff stats	Aggregate stats by agent, model, file
agentdiff log	Chronological AI contribution history
agentdiff diff [<sha>]	Attribution diff for a commit or range
agentdiff show <sha>	Full details for one commit
agentdiff report	CI report in Markdown or GitHub annotations
agentdiff config	Manage global configuration

Command flags and examples

# Filter list by agent or file
agentdiff list --agent cursor --file src/auth
agentdiff list --limit 50

# Blame for a specific agent only
agentdiff blame src/api.rs --agent claude-code

# Stats broken down by file and model
agentdiff stats --by-file --by-model

# Stats from a specific date
agentdiff stats --since 2026-01-01T00:00:00Z

# CI report to file
agentdiff report --format markdown --out-md report.md
agentdiff report --format annotations --out-annotations annotations.json

# Attribution diff for last 3 commits
agentdiff diff HEAD~3

# Skip specific agents during configure
agentdiff configure --no-copilot --no-antigravity

# Skip git hook install during init
agentdiff init --no-git-hook

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Supported Agents

Agent	Hook mechanism	Captures
Claude Code	PostToolUse hook (~/.claude/settings.json)	Edit, Write, MultiEdit
Cursor	afterFileEdit, afterTabFileEdit hooks	Agent edits + Tab completions
GitHub Copilot	VS Code extension (~/.vscode/extensions/)	Inline completions, chat edits
Windsurf	post_write_code hook (~/.codeium/windsurf/hooks.json)	Cascade agent writes
OpenCode	tool.execute.after plugin (~/.config/opencode/plugins/)	All tool writes
Codex CLI	notify hook (~/.codex/config.toml)	Task-level file changes
Gemini / Antigravity	BeforeTool/AfterTool hooks (~/.gemini/settings.json)	write_file, replace

Agent hooks for Claude, Cursor, Codex, Windsurf, OpenCode, and Gemini are all installed globally once via agentdiff configure — no per-repo setup needed for those.

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Example Output

agentdiff list

  agentdiff list — 5 entries

  #   COMMIT     TIME          AGENT         MODEL           FILES  LINES   PROMPT
  ──────────────────────────────────────────────────────────────────────────────────────────────────
  1   a1b2c3d4   Mar 20 17:52  claude-code   sonnet-4-6      1      17-24   "add auth middleware"
  2   b2c3d4e5   Mar 20 18:10  cursor        cursor-fast     2      1, 44   "refactor utils module"
  3   c3d4e5f6   Mar 20 18:45  copilot       gpt-4o          1      10-12   —
  4   d4e5f6a7   Mar 20 19:01  codex         o4-mini         3      1-89    "migrate to new API"
  *   (pending)  Mar 20 19:14  claude-code   sonnet-4-6      1      5-31    "add tests"  (uncommitted)

agentdiff blame src/main.rs

  agentdiff blame — src/main.rs

     1  human         fn main() {
     2  human             let cli = Cli::parse();
     3  claude-code       let config = Config::load()?;  (Edit)
     4  claude-code       let store = Store::new(repo_root, config);  (Edit)
     5  human
     6  cursor            match cli.command {  (afterFileEdit)
     7  cursor                Command::Init(args) => init::run_init(&repo_root, &mut cfg),  (afterFileEdit)
     8  human             }
     9  human         }

agentdiff report (Markdown)

## AI Attribution Report

**Total lines tracked:** 4,231 across 47 commits

| Agent | Lines | Share |
|-------|-------|-------|
| claude-code | 2,741 | 65% |
| cursor | 973 | 23% |
| copilot | 353 | 8% |
| human | 164 | 4% |

### Recent AI commits
- `a1b2c3d` claude-code — "add auth middleware" → src/auth.rs (17-24)
- `b2c3d4e` cursor — "refactor utils" → src/utils.rs (1-89)

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How It Works

Architecture overview

1. agentdiff configure — one-time global setup

Installs Python capture scripts to ~/.agentdiff/scripts/ and registers hooks with each agent:

• Claude Code → ~/.claude/settings.json (PostToolUse)
• Cursor → ~/.cursor/hooks.json (afterFileEdit, afterTabFileEdit)
• Codex → ~/.codex/config.toml (notify)
• Gemini → ~/.gemini/settings.json (BeforeTool, AfterTool)
• Windsurf → ~/.codeium/windsurf/hooks.json (post_write_code)
• OpenCode → ~/.config/opencode/plugins/agentdiff.ts (tool.execute.after)
• Copilot → VS Code extension in ~/.vscode/extensions/agentdiff-copilot-0.1.0/

2. agentdiff init — per-repo setup

Installs git pre-commit and post-commit hooks in <repo>/.git/hooks/, creates .agentdiff/ledger.jsonl, and registers the repo in ~/.agentdiff/config.toml.

3. Capture flow

When an AI agent makes an edit, its hook fires and writes a JSON entry to <repo>/.git/agentdiff/session.jsonl:

{
  "timestamp": "2026-03-28T10:54:00Z",
  "agent": "claude-code",
  "model": "sonnet-4-6",
  "session_id": "sess_abc123",
  "tool": "Edit",
  "file": "src/auth.rs",
  "lines": [17, 18, 19, 20],
  "prompt": "add auth middleware"
}

4. Commit

On git commit:

• Pre-commit hook: matches session entries against staged diff → writes pending-ledger.json
• Post-commit hook: finalizes one ledger line with the commit SHA → appends to .agentdiff/ledger.jsonl
• By default, auto-amends the commit to include the updated ledger

5. Query

~/.agentdiff/
├── config.toml           ← global config
└── scripts/              ← capture scripts (Python)

<repo>/.agentdiff/
└── ledger.jsonl          ← committed, append-only attribution log

<repo>/.git/agentdiff/
├── session.jsonl         ← live capture buffer (not committed)
├── pending.json          ← MCP context handoff (ephemeral)
└── pending-ledger.json   ← pre-commit snapshot (ephemeral)

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Configuration

Config lives at ~/.agentdiff/config.toml:

schema_version = "1.0"
scripts_dir = "~/.agentdiff/scripts"
auto_amend_ledger = true        # include ledger in same commit automatically
data_dir = "~/.agentdiff/spillover"

[[repos]]
path = "/home/user/my-project"
slug = "-home-user-my-project"

# Disable auto-amend
agentdiff config set auto_amend_ledger false

# View current config
agentdiff config show

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MCP Server

agentdiff-mcp is a stdio MCP server for richer context capture. It exposes a record_context tool that writes structured metadata before a commit:

{
  "mcpServers": {
    "agentdiff": {
      "command": "agentdiff-mcp",
      "args": []
    }
  }
}

When an agent calls record_context, the prompt, model, session ID, files read, intent, and trust score are stored and attached to the next ledger entry:

{
  "cwd": "/path/to/repo",
  "model_id": "claude-sonnet-4-6",
  "prompt": "add rate limiting to the API",
  "files_read": ["src/api.rs", "src/config.rs"],
  "intent": "security hardening",
  "trust": 92,
  "flags": ["security"]
}

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CI Integration

Add AI attribution to your pull requests with one workflow step:

# .github/workflows/agentdiff-report.yml
on: [pull_request]

jobs:
  report:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0
      - name: Install agentdiff
        run: |
          curl -fsSL https://raw.githubusercontent.com/codeprakhar25/agentdiff/master/install.sh | bash
          echo "$HOME/.local/bin" >> $GITHUB_PATH
      - name: Init repo (no agent hooks needed in CI)
        run: agentdiff init --no-git-hook
      - name: Generate report
        run: agentdiff report --format markdown --out-md ai-report.md
      - name: Post as PR comment
        uses: marocchino/sticky-pull-request-comment@v2
        with:
          path: ai-report.md

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Debugging

# Enable verbose logging for all capture scripts
export AGENTDIFF_DEBUG=1

# Then make an AI edit and commit, then check logs
tail -f ~/.agentdiff/logs/capture-claude.log
tail -f ~/.agentdiff/logs/capture-cursor.log
tail -f ~/.agentdiff/logs/capture-codex.log

# Check what was captured before committing
cat .git/agentdiff/session.jsonl

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Contributing

See CONTRIBUTING.md.

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License

Dual-licensed under MIT and Apache-2.0.