docs: replace deprecated --ai flag with --integration in all documentation

Replace all user-facing --ai, --ai-skills, and --ai-commands-dir references
with their modern equivalents:

- --ai <agent> → --integration <agent>
- --ai-skills → --integration-options="--skills"
- --ai-commands-dir <dir> → --integration generic --integration-options="--commands-dir <dir>"

Updated files:
- README.md (~17 occurrences)
- docs/installation.md (~8 occurrences)
- docs/upgrade.md (~11 occurrences)
- docs/local-development.md (~5 occurrences)
- CONTRIBUTING.md (1 occurrence)
- extensions/EXTENSION-USER-GUIDE.md (1 occurrence)
- src/specify_cli/__init__.py (docstring examples and error messages)

Left unchanged:
- CHANGELOG.md (historical record)
- Test files (intentionally exercise deprecated flag path)
- CLI flag implementation (backward compatibility)

Closes #2358

Author: mnriem

CONTRIBUTING.md

@@ -94,7 +94,7 @@ uv pip install -e .
 # Ensure the `specify` binary in this environment points at your working tree so the agent runs the branch you're testing.
 
 # Initialize a test project using your local changes
-uv run specify init <temp-dir>/speckit-test --ai <agent> --offline
+uv run specify init <temp-dir>/speckit-test --integration <agent> --offline
 cd <temp-dir>/speckit-test
 
 # Open in your agent

README.md

@@ -81,9 +81,9 @@ And use the tool directly:
 specify init <PROJECT_NAME>
 
 # Or initialize in existing project
-specify init . --ai copilot
+specify init . --integration copilot
 # or
-specify init --here --ai copilot
+specify init --here --integration copilot
 
 # Check installed tools
 specify check
@@ -105,9 +105,9 @@ Run directly without installing:
 uvx --from git+https://github.com/github/spec-kit.git@vX.Y.Z specify init <PROJECT_NAME>
 
 # Or initialize in existing project
-uvx --from git+https://github.com/github/spec-kit.git@vX.Y.Z specify init . --ai copilot
+uvx --from git+https://github.com/github/spec-kit.git@vX.Y.Z specify init . --integration copilot
 # or
-uvx --from git+https://github.com/github/spec-kit.git@vX.Y.Z specify init --here --ai copilot
+uvx --from git+https://github.com/github/spec-kit.git@vX.Y.Z specify init --here --integration copilot
 ```
 
 **Benefits of persistent installation:**
@@ -302,7 +302,7 @@ Run `specify integration list` to see all available integrations in your install
 
 ## Available Slash Commands
 
-After running `specify init`, your AI coding agent will have access to these slash commands for structured development. If you pass `--ai <agent> --ai-skills`, Spec Kit installs agent skills instead of slash-command prompt files; `--ai-skills` requires `--ai`.
+After running `specify init`, your AI coding agent will have access to these slash commands for structured development. If you pass `--integration <agent> --integration-options="--skills"`, Spec Kit installs agent skills instead of slash-command prompt files.
 
 #### Core Commands
 
@@ -478,29 +478,29 @@ specify init --here --force
 You will be prompted to select the AI agent you are using. You can also proactively specify it directly in the terminal:
 
 ```bash
-specify init <project_name> --ai copilot
-specify init <project_name> --ai gemini
-specify init <project_name> --ai copilot
+specify init <project_name> --integration copilot
+specify init <project_name> --integration gemini
+specify init <project_name> --integration copilot
 
 # Or in current directory:
-specify init . --ai copilot
-specify init . --ai codex --ai-skills
+specify init . --integration copilot
+specify init . --integration codex --integration-options="--skills"
 
 # or use --here flag
-specify init --here --ai copilot
-specify init --here --ai codex --ai-skills
+specify init --here --integration copilot
+specify init --here --integration codex --integration-options="--skills"
 
 # Force merge into a non-empty current directory
-specify init . --force --ai copilot
+specify init . --force --integration copilot
 
 # or
-specify init --here --force --ai copilot
+specify init --here --force --integration copilot
 ```
 
 The CLI will check if you have Claude Code, Gemini CLI, Cursor CLI, Qwen CLI, opencode, Codex CLI, Qoder CLI, Tabnine CLI, Kiro CLI, Pi, Forge, Goose, or Mistral Vibe installed. If you do not, or you prefer to get the templates without checking for the right tools, use `--ignore-agent-tools` with your command:
 
 ```bash
-specify init <project_name> --ai copilot --ignore-agent-tools
+specify init <project_name> --integration copilot --ignore-agent-tools
 ```
 
 ### **STEP 1:** Establish project principles

docs/installation.md

@@ -39,16 +39,16 @@ uvx --from git+https://github.com/github/spec-kit.git@vX.Y.Z specify init .
 uvx --from git+https://github.com/github/spec-kit.git@vX.Y.Z specify init --here
 ```
 
-### Specify AI Agent
+### Specify Integration
 
 You can proactively specify your AI agent during initialization:
 
 ```bash
-uvx --from git+https://github.com/github/spec-kit.git@vX.Y.Z specify init <project_name> --ai claude
-uvx --from git+https://github.com/github/spec-kit.git@vX.Y.Z specify init <project_name> --ai gemini
-uvx --from git+https://github.com/github/spec-kit.git@vX.Y.Z specify init <project_name> --ai copilot
-uvx --from git+https://github.com/github/spec-kit.git@vX.Y.Z specify init <project_name> --ai codebuddy
-uvx --from git+https://github.com/github/spec-kit.git@vX.Y.Z specify init <project_name> --ai pi
+uvx --from git+https://github.com/github/spec-kit.git@vX.Y.Z specify init <project_name> --integration claude
+uvx --from git+https://github.com/github/spec-kit.git@vX.Y.Z specify init <project_name> --integration gemini
+uvx --from git+https://github.com/github/spec-kit.git@vX.Y.Z specify init <project_name> --integration copilot
+uvx --from git+https://github.com/github/spec-kit.git@vX.Y.Z specify init <project_name> --integration codebuddy
+uvx --from git+https://github.com/github/spec-kit.git@vX.Y.Z specify init <project_name> --integration pi
 ```
 
 ### Specify Script Type (Shell vs PowerShell)
@@ -73,7 +73,7 @@ uvx --from git+https://github.com/github/spec-kit.git@vX.Y.Z specify init <proje
 If you prefer to get the templates without checking for the right tools:
 
 ```bash
-uvx --from git+https://github.com/github/spec-kit.git@vX.Y.Z specify init <project_name> --ai claude --ignore-agent-tools
+uvx --from git+https://github.com/github/spec-kit.git@vX.Y.Z specify init <project_name> --integration claude --ignore-agent-tools
 ```
 
 ## Verification
@@ -131,7 +131,7 @@ pip install --no-index --find-links=./dist specify-cli
 
 ```bash
 # Initialize a project — no GitHub access needed
-specify init my-project --ai claude --offline
+specify init my-project --integration claude --offline
 ```
 
 The `--offline` flag tells the CLI to use the templates, commands, and scripts bundled inside the wheel instead of downloading from GitHub.

docs/local-development.md

@@ -20,7 +20,7 @@ You can execute the CLI via the module entrypoint without installing anything:
 ```bash
 # From repo root
 python -m src.specify_cli --help
-python -m src.specify_cli init demo-project --ai claude --ignore-agent-tools --script sh
+python -m src.specify_cli init demo-project --integration claude --ignore-agent-tools --script sh
 ```
 
 If you prefer invoking the script file style (uses shebang):
@@ -52,7 +52,7 @@ Re-running after code edits requires no reinstall because of editable mode.
 `uvx` can run from a local path (or a Git ref) to simulate user flows:
 
 ```bash
-uvx --from . specify init demo-uvx --ai copilot --ignore-agent-tools --script sh
+uvx --from . specify init demo-uvx --integration copilot --ignore-agent-tools --script sh
 ```
 
 You can also point uvx at a specific branch without merging:
@@ -69,14 +69,14 @@ If you're in another directory, use an absolute path instead of `.`:
 
 ```bash
 uvx --from /mnt/c/GitHub/spec-kit specify --help
-uvx --from /mnt/c/GitHub/spec-kit specify init demo-anywhere --ai copilot --ignore-agent-tools --script sh
+uvx --from /mnt/c/GitHub/spec-kit specify init demo-anywhere --integration copilot --ignore-agent-tools --script sh
 ```
 
 Set an environment variable for convenience:
 
 ```bash
 export SPEC_KIT_SRC=/mnt/c/GitHub/spec-kit
-uvx --from "$SPEC_KIT_SRC" specify init demo-env --ai copilot --ignore-agent-tools --script ps
+uvx --from "$SPEC_KIT_SRC" specify init demo-env --integration copilot --ignore-agent-tools --script ps
 ```
 
 (Optional) Define a shell function:
@@ -123,7 +123,7 @@ When testing `init --here` in a dirty directory, create a temp workspace:
 
 ```bash
 mkdir /tmp/spec-test && cd /tmp/spec-test
-python -m src.specify_cli init --here --ai claude --ignore-agent-tools --script sh  # if repo copied here
+python -m src.specify_cli init --here --integration claude --ignore-agent-tools --script sh  # if repo copied here
 ```
 
 Or copy only the modified CLI portion if you want a lighter sandbox.

docs/upgrade.md

@@ -10,7 +10,7 @@
 |----------------|---------|-------------|
 | **CLI Tool Only** | `uv tool install specify-cli --force --from git+https://github.com/github/spec-kit.git@vX.Y.Z` | Get latest CLI features without touching project files |
 | **CLI Tool Only (pipx)** | `pipx install --force git+https://github.com/github/spec-kit.git@vX.Y.Z` | Reinstall/upgrade a pipx-installed CLI to a specific release |
-| **Project Files** | `specify init --here --force --ai <your-agent>` | Update slash commands, templates, and scripts in your project |
+| **Project Files** | `specify init --here --force --integration <your-agent>` | Update slash commands, templates, and scripts in your project |
 | **Both** | Run CLI upgrade, then project update | Recommended for major version updates |
 
 ---
@@ -32,7 +32,7 @@ uv tool install specify-cli --force --from git+https://github.com/github/spec-ki
 Specify the desired release tag:
 
 ```bash
-uvx --from git+https://github.com/github/spec-kit.git@vX.Y.Z specify init --here --ai copilot
+uvx --from git+https://github.com/github/spec-kit.git@vX.Y.Z specify init --here --integration copilot
 ```
 
 ### If you installed with `pipx`
@@ -82,15 +82,15 @@ The `specs/` directory is completely excluded from template packages and will ne
 Run this inside your project directory:
 
 ```bash
-specify init --here --force --ai <your-agent>
+specify init --here --force --integration <your-agent>
 ```
 
 Replace `<your-agent>` with your AI coding agent. Refer to this list of [Supported AI Coding Agent Integrations](reference/integrations.md)
 
 **Example:**
 
 ```bash
-specify init --here --force --ai copilot
+specify init --here --force --integration copilot
 ```
 
 ### Understanding the `--force` flag
@@ -124,7 +124,7 @@ Without `--force`, shared infrastructure files that already exist are skipped 
 cp .specify/memory/constitution.md .specify/memory/constitution-backup.md
 
 # 2. Run the upgrade
-specify init --here --force --ai copilot
+specify init --here --force --integration copilot
 
 # 3. Restore your customized constitution
 mv .specify/memory/constitution-backup.md .specify/memory/constitution.md
@@ -182,7 +182,7 @@ Restart your IDE to refresh the command list.
 uv tool install specify-cli --force --from git+https://github.com/github/spec-kit.git
 
 # Update project files to get new commands
-specify init --here --force --ai copilot
+specify init --here --force --integration copilot
 
 # Restore your constitution if customized
 git restore .specify/memory/constitution.md
@@ -199,7 +199,7 @@ cp -r .specify/templates /tmp/templates-backup
 uv tool install specify-cli --force --from git+https://github.com/github/spec-kit.git
 
 # 3. Update project
-specify init --here --force --ai copilot
+specify init --here --force --integration copilot
 
 # 4. Restore customizations
 mv /tmp/constitution-backup.md .specify/memory/constitution.md
@@ -232,7 +232,7 @@ If you initialized your project with `--no-git`, you can still upgrade:
 cp .specify/memory/constitution.md /tmp/constitution-backup.md
 
 # Run upgrade
-specify init --here --force --ai copilot --no-git
+specify init --here --force --integration copilot --no-git
 
 # Restore customizations
 mv /tmp/constitution-backup.md .specify/memory/constitution.md
@@ -253,13 +253,13 @@ The `--no-git` flag tells Spec Kit to **skip git repository initialization**. Th
 **During initial setup:**
 
 ```bash
-specify init my-project --ai copilot --no-git
+specify init my-project --integration copilot --no-git
 ```
 
 **During upgrade:**
 
 ```bash
-specify init --here --force --ai copilot --no-git
+specify init --here --force --integration copilot --no-git
 ```
 
 ### What `--no-git` does NOT do
@@ -367,7 +367,7 @@ Only Spec Kit infrastructure files:
 - **Use `--force` flag** - Skip this confirmation entirely:
 
   ```bash
-  specify init --here --force --ai copilot
+  specify init --here --force --integration copilot
   ```
 
 **When you see this warning:**

extensions/EXTENSION-USER-GUIDE.md

@@ -189,7 +189,7 @@ Provided commands:
 
 ### Automatic Agent Skill Registration
 
-If your project was initialized with `--ai-skills`, extension commands are **automatically registered as agent skills** during installation. This ensures that extensions are discoverable by agents that use the [agentskills.io](https://agentskills.io) skill specification.
+If your project was initialized with `--integration-options="--skills"`, extension commands are **automatically registered as agent skills** during installation. This ensures that extensions are discoverable by agents that use the [agentskills.io](https://agentskills.io) skill specification.
 
 ```text
 ✓ Extension installed successfully!

src/specify_cli/__init__.py

@@ -1004,22 +1004,22 @@ def init(
 
     Examples:
         specify init my-project
-        specify init my-project --ai claude
-        specify init my-project --ai copilot --no-git
+        specify init my-project --integration claude
+        specify init my-project --integration copilot --no-git
         specify init --ignore-agent-tools my-project
-        specify init . --ai claude         # Initialize in current directory
+        specify init . --integration claude         # Initialize in current directory
         specify init .                     # Initialize in current directory (interactive AI selection)
-        specify init --here --ai claude    # Alternative syntax for current directory
-        specify init --here --ai codex --ai-skills
-        specify init --here --ai codebuddy
-        specify init --here --ai vibe      # Initialize with Mistral Vibe support
+        specify init --here --integration claude    # Alternative syntax for current directory
+        specify init --here --integration codex --integration-options="--skills"
+        specify init --here --integration codebuddy
+        specify init --here --integration vibe      # Initialize with Mistral Vibe support
         specify init --here
         specify init --here --force  # Skip confirmation when current directory not empty
-        specify init my-project --ai claude   # Claude installs skills by default
-        specify init --here --ai gemini --ai-skills
-        specify init my-project --ai generic --ai-commands-dir .myagent/commands/  # Unsupported agent
+        specify init my-project --integration claude   # Claude installs skills by default
+        specify init --here --integration gemini --integration-options="--skills"
+        specify init my-project --integration generic --integration-options="--commands-dir .myagent/commands/"  # Unsupported agent
         specify init my-project --offline  # Use bundled assets (no network access)
-        specify init my-project --ai claude --preset healthcare-compliance  # With preset
+        specify init my-project --integration claude --preset healthcare-compliance  # With preset
     """
 
     show_banner()
@@ -1029,14 +1029,14 @@ def init(
     if ai_assistant and ai_assistant.startswith("--"):
         console.print(f"[red]Error:[/red] Invalid value for --ai: '{ai_assistant}'")
         console.print("[yellow]Hint:[/yellow] Did you forget to provide a value for --ai?")
-        console.print("[yellow]Example:[/yellow] specify init --ai claude --here")
+        console.print("[yellow]Example:[/yellow] specify init --integration claude --here")
         console.print(f"[yellow]Available agents:[/yellow] {', '.join(AGENT_CONFIG.keys())}")
         raise typer.Exit(1)
 
     if ai_commands_dir and ai_commands_dir.startswith("--"):
         console.print(f"[red]Error:[/red] Invalid value for --ai-commands-dir: '{ai_commands_dir}'")
         console.print("[yellow]Hint:[/yellow] Did you forget to provide a value for --ai-commands-dir?")
-        console.print("[yellow]Example:[/yellow] specify init --ai generic --ai-commands-dir .myagent/commands/")
+        console.print("[yellow]Example:[/yellow] specify init --integration generic --integration-options=\"--commands-dir .myagent/commands/\"")
         raise typer.Exit(1)
 
     if ai_assistant: