feat(init)!: make git extension opt-in and remove --no-git at v0.10.0

- Remove --no-git parameter from specify init command
- Remove git extension auto-installation from init flow
- Git repository initialization (git init) still runs when git is available
- Remove --no-git from all test invocations across the test suite
- Update docs to reflect opt-in git extension behavior
- Replace TestGitExtensionAutoInstall with TestGitExtensionOptIn tests

BREAKING CHANGE: specify init no longer auto-installs the git extension.
Use `specify extension add git` to install it explicitly.
The --no-git flag has been removed.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: mnriem

docs/local-development.md

@@ -162,7 +162,7 @@ rm -rf .venv dist build *.egg-info
 |---------|-----|
 | `ModuleNotFoundError: typer` | Run `uv pip install -e .` |
 | Scripts not executable (Linux) | Re-run init or `chmod +x scripts/*.sh` |
-| Git step skipped | You passed `--no-git` or Git not installed |
+| Git step skipped | Git not installed on your system |
 | Wrong script type downloaded | Pass `--script sh` or `--script ps` explicitly |
 | TLS errors on corporate network | Configure your environment's certificate store or proxy. The `--skip-tls` flag is deprecated and has no effect. |
 

docs/reference/core.md

@@ -15,16 +15,14 @@ specify init [<project_name>]
 | `--script sh\|ps`        | Script type: `sh` (bash/zsh) or `ps` (PowerShell)                       |
 | `--here`                 | Initialize in the current directory instead of creating a new one        |
 | `--force`                | Force merge/overwrite when initializing in an existing directory         |
-| `--no-git`               | Skip git repository initialization                                       |
 | `--ignore-agent-tools`   | Skip checks for AI coding agent CLI tools                                |
 | `--preset <id>`          | Install a preset during initialization                                   |
 | `--branch-numbering`     | Branch numbering strategy: `sequential` (default) or `timestamp`         |
 
 Creates a new Spec Kit project with the necessary directory structure, templates, scripts, and AI coding agent integration files.
 
 > [!NOTE]
-> The git extension is currently enabled by default during `specify init`.
-> Starting in `v0.10.0`, it will require explicit opt-in. To add it after init, run `specify extension add git`.
+> The git extension is opt-in during `specify init`. To add it after init, run `specify extension add git`.
 
 Use `<project_name>` to create a new directory, or `--here` (or `.`) to initialize in the current directory. If the directory already has files, use `--force` to merge without confirmation.
 
@@ -45,9 +43,6 @@ specify init --here --force --integration copilot
 # Use PowerShell scripts (Windows/cross-platform)
 specify init my-project --integration copilot --script ps
 
-# Skip git initialization
-specify init my-project --integration copilot --no-git
-
 # Install a preset during initialization
 specify init my-project --integration copilot --preset compliance
 

docs/upgrade.md

@@ -257,58 +257,28 @@ rm speckit.old-command-name.md
 # Restart your IDE
 ```
 
-### Scenario 4: "I'm working on a project without Git"
+### Scenario 4: "I don't want the git extension"
 
-If you initialized your project with `--no-git`, you can still upgrade:
+The git extension is now opt-in, so upgrades do not install it unless you add it explicitly.
 
 ```bash
 # Manually back up files you customized
-cp .specify/memory/constitution.md /tmp/constitution-backup.md
+cp .specify/memory/constitution.md .specify/memory/constitution.backup.md
 
 # Run upgrade
-specify init --here --force --integration copilot --no-git
+specify init --here --force --integration copilot
 
 # Restore customizations
-mv /tmp/constitution-backup.md .specify/memory/constitution.md
-```
-
-The `--no-git` flag skips git initialization but doesn't affect file updates.
-
----
-
-## Using `--no-git` Flag
-
-The `--no-git` flag tells Spec Kit to **skip git repository initialization**. This is useful when:
-
-- You manage version control differently (Mercurial, SVN, etc.)
-- Your project is part of a larger monorepo with existing git setup
-- You're experimenting and don't want version control yet
-
-**During initial setup:**
-
-```bash
-specify init my-project --integration copilot --no-git
+mv .specify/memory/constitution.backup.md .specify/memory/constitution.md
 ```
 
-**During upgrade:**
+If you later decide you want the git extension's commands and hooks, install it explicitly:
 
 ```bash
-specify init --here --force --integration copilot --no-git
+specify extension add git
 ```
 
-### What `--no-git` does NOT do
-
-❌ Does NOT prevent file updates
-❌ Does NOT skip slash command installation
-❌ Does NOT affect template merging
-
-It **only** skips running `git init` and creating the initial commit.
-
-### Working without Git
-
-If you use `--no-git`, you'll need to manage feature directories manually:
-
-**Set the `SPECIFY_FEATURE` environment variable** before using planning commands:
+Projects that do not use Git can still work with Spec Kit by setting `SPECIFY_FEATURE` manually before planning commands:
 
 ```bash
 # Bash/Zsh
@@ -318,10 +288,6 @@ export SPECIFY_FEATURE="001-my-feature"
 $env:SPECIFY_FEATURE = "001-my-feature"
 ```
 
-This tells Spec Kit which feature directory to use when creating specs, plans, and tasks.
-
-**Why this matters:** Without git, Spec Kit can't detect your current branch name to determine the active feature. The environment variable provides that context manually.
-
 ---
 
 ## Troubleshooting

src/specify_cli/commands/init.py

@@ -71,7 +71,6 @@ def init(
         project_name: str = typer.Argument(None, help="Name for your new project directory (optional if using --here, or use '.' for current directory)"),
         script_type: str = typer.Option(None, "--script", help="Script type to use: sh or ps"),
         ignore_agent_tools: bool = typer.Option(False, "--ignore-agent-tools", help="Skip checks for coding agent tools like Claude Code"),
-        no_git: bool = typer.Option(False, "--no-git", help="Skip git repository initialization"),
         here: bool = typer.Option(False, "--here", help="Initialize project in the current directory instead of creating a new one"),
         force: bool = typer.Option(False, "--force", help="Force merge/overwrite when using --here (skip confirmation)"),
         skip_tls: bool = typer.Option(False, "--skip-tls", help="Deprecated (no-op). Previously: skip SSL/TLS verification.", hidden=True),
@@ -96,13 +95,12 @@ def init(
            in non-interactive sessions
         3. Install bundled Spec Kit templates, scripts, workflow, and shared
            project infrastructure
-        4. Initialize a fresh git repository (if not --no-git and no existing repo)
+        4. Initialize a fresh git repository (if git is available and no existing repo)
         5. Set up coding agent integration commands and optional presets
 
         Examples:
             specify init my-project
             specify init my-project --integration claude
-            specify init my-project --integration copilot --no-git
             specify init --ignore-agent-tools my-project
             specify init . --integration claude         # Initialize in current directory
             specify init .                     # Initialize in current directory (interactive integration selection)
@@ -142,13 +140,6 @@ def init(
                 console.print(f"[yellow]Available integrations:[/yellow] {available}")
                 raise typer.Exit(1)
 
-        if no_git:
-            console.print(
-                "[yellow]⚠️  --no-git is deprecated and will be removed in v0.10.0.[/yellow]\n"
-                "[yellow]The git extension will no longer be enabled by default "
-                "— use the [bold]specify extension[/bold] commands to install or enable the git extension if needed.[/yellow]"
-            )
-
         if project_name == ".":
             here = True
             project_name = None
@@ -253,11 +244,9 @@ def init(
 
         console.print(Panel("\n".join(setup_lines), border_style="cyan", padding=(1, 2)))
 
-        should_init_git = False
-        if not no_git:
-            should_init_git = check_tool("git")
-            if not should_init_git:
-                console.print("[yellow]Git not found - will skip repository initialization[/yellow]")
+        should_init_git = check_tool("git")
+        if not should_init_git:
+            console.print("[yellow]Git not found - will skip repository initialization[/yellow]")
 
         if not ignore_agent_tools:
             agent_config = AGENT_CONFIG.get(selected_ai)
@@ -308,15 +297,13 @@ def init(
         for key, label in [
             ("chmod", "Ensure scripts executable"),
             ("constitution", "Constitution setup"),
-            ("git", "Install git extension"),
+            ("git", "Git repository setup"),
             ("workflow", "Install bundled workflow"),
             ("agent-context", "Install agent-context extension"),
             ("final", "Finalize"),
         ]:
             tracker.add(key, label)
 
-        git_default_notice = False
-
         with Live(tracker.render(), console=console, refresh_per_second=8, transient=True) as live:
             tracker.attach_refresh(lambda: live.update(tracker.render()))
             try:
@@ -369,54 +356,29 @@ def init(
 
                 ensure_constitution_from_template(project_path, tracker=tracker)
 
-                if not no_git:
-                    tracker.start("git")
-                    git_messages = []
-                    git_has_error = False
-                    if is_git_repo(project_path):
-                        git_messages.append("existing repo detected")
-                    elif should_init_git:
-                        success, error_msg = init_git_repo(project_path, quiet=True)
-                        if success:
-                            git_messages.append("initialized")
-                        else:
-                            git_has_error = True
-                            if error_msg:
-                                sanitized = error_msg.replace('\n', ' ').strip()
-                                git_messages.append(f"init failed: {sanitized[:120]}")
-                            else:
-                                git_messages.append("init failed")
+                tracker.start("git")
+                git_messages = []
+                git_has_error = False
+                if is_git_repo(project_path):
+                    git_messages.append("existing repo detected")
+                elif should_init_git:
+                    success, error_msg = init_git_repo(project_path, quiet=True)
+                    if success:
+                        git_messages.append("initialized")
                     else:
-                        git_messages.append("git not available")
-                    try:
-                        from ..extensions import ExtensionManager
-                        bundled_path = _locate_bundled_extension("git")
-                        if bundled_path:
-                            manager = ExtensionManager(project_path)
-                            if manager.registry.is_installed("git"):
-                                git_messages.append("extension already installed")
-                            else:
-                                manager.install_from_directory(
-                                    bundled_path, get_speckit_version()
-                                )
-                                git_default_notice = True
-                                git_messages.append("extension installed")
-                        else:
-                            git_has_error = True
-                            git_messages.append("bundled extension not found")
-                    except Exception as ext_err:
                         git_has_error = True
-                        sanitized_ext = str(ext_err).replace('\n', ' ').strip()
-                        git_messages.append(
-                            f"extension install failed: {sanitized_ext[:120]}"
-                        )
-                    summary = "; ".join(git_messages)
-                    if git_has_error:
-                        tracker.error("git", summary)
-                    else:
-                        tracker.complete("git", summary)
+                        if error_msg:
+                            sanitized = error_msg.replace('\n', ' ').strip()
+                            git_messages.append(f"init failed: {sanitized[:120]}")
+                        else:
+                            git_messages.append("init failed")
                 else:
-                    tracker.skip("git", "--no-git flag")
+                    git_messages.append("git not available")
+                summary = "; ".join(git_messages)
+                if git_has_error:
+                    tracker.error("git", summary)
+                else:
+                    tracker.complete("git", summary)
 
                 try:
                     bundled_wf = _locate_bundled_workflow("speckit")
@@ -596,18 +558,6 @@ def init(
                 console.print()
                 console.print(security_notice)
 
-        if git_default_notice:
-            default_change_notice = Panel(
-                "The git extension is currently enabled by default during [bold]specify init[/bold].\n"
-                "Starting in [bold]v0.10.0[/bold], this will require explicit opt-in.\n"
-                "Use [bold]specify extension add git[/bold] after init when needed.",
-                title="[yellow]Notice: Git Default Changing[/yellow]",
-                border_style="yellow",
-                padding=(1, 2),
-            )
-            console.print()
-            console.print(default_change_notice)
-
         steps_lines = []
         if not here:
             steps_lines.append(f"1. Go to the project folder: [cyan]cd {project_name}[/cyan]")