@@ -1907,6 +1907,7 @@ def init(
     preset: str = typer.Option(None, "--preset", help="Install a preset during initialization (by preset ID)"),
     branch_numbering: str = typer.Option(None, "--branch-numbering", help="Branch numbering strategy: 'sequential' (001, 002, ...) or 'timestamp' (YYYYMMDD-HHMMSS)"),
     integration: str = typer.Option(None, "--integration", help="Use the new integration system (e.g. --integration copilot). Mutually exclusive with --ai."),
+    integration_options: str = typer.Option(None, "--integration-options", help='Options for the integration (e.g. --integration-options="--commands-dir .myagent/cmds")'),
 ):
     """
     Initialize a new Specify project.
@@ -1997,6 +1998,26 @@ def init(
                 f"--ai {ai_assistant}. The --ai flag will be deprecated in a future release.[/dim]"
             )
 
+    # Deprecation warnings for --ai-skills and --ai-commands-dir when using integration path
+    if use_integration:
+        if ai_skills:
+            from .integrations.base import SkillsIntegration as _SkillsCheck
+            if isinstance(resolved_integration, _SkillsCheck):
+                console.print(
+                    "[dim]Note: --ai-skills is not needed with --integration; "
+                    "skills are the default for this integration.[/dim]"
+                )
+            else:
+                console.print(
+                    "[dim]Note: --ai-skills has no effect with --integration "
+                    f"{resolved_integration.key}; this integration uses commands, not skills.[/dim]"
+                )
+        if ai_commands_dir and resolved_integration.key != "generic":
+            console.print(
+                "[dim]Note: --ai-commands-dir is deprecated; "
+                'use [bold]--integration generic --integration-options="--commands-dir <dir>"[/bold] instead.[/dim]'
+            )
+
     if project_name == ".":
         here = True
         project_name = None  # Clear project_name to use existing validation logic
@@ -2062,8 +2083,18 @@ def init(
             "copilot"
         )
 
+    # Auto-promote interactively selected agents to the integration path
+    # when a matching integration is registered (same behavior as --ai).
+    if not use_integration:
+        from .integrations import get_integration as _get_int
+        _resolved = _get_int(selected_ai)
+        if _resolved:
+            use_integration = True
+            resolved_integration = _resolved
+
     # Agents that have moved from explicit commands/prompts to agent skills.
-    if selected_ai in AGENT_SKILLS_MIGRATIONS and not ai_skills:
+    # Skip this check when using the integration path — skills are the default.
+    if not use_integration and selected_ai in AGENT_SKILLS_MIGRATIONS and not ai_skills:
         # If selected interactively (no --ai provided), automatically enable
         # ai_skills so the agent remains usable without requiring an extra flag.
         # Preserve fail-fast behavior only for explicit '--ai <agent>' without skills.
@@ -2073,14 +2104,20 @@ def init(
             ai_skills = True
             console.print(f"\n[yellow]Note:[/yellow] {AGENT_SKILLS_MIGRATIONS[selected_ai]['interactive_note']}")
 
-    # Validate --ai-commands-dir usage
-    if selected_ai == "generic":
+    # Validate --ai-commands-dir usage.
+    # Skip validation when --integration-options is provided — the integration
+    # will validate its own options in setup().
+    if selected_ai == "generic" and not integration_options:
         if not ai_commands_dir:
-            console.print("[red]Error:[/red] --ai-commands-dir is required when using --ai generic")
-            console.print("[dim]Example: specify init my-project --ai generic --ai-commands-dir .myagent/commands/[/dim]")
+            console.print("[red]Error:[/red] --ai-commands-dir is required when using --ai generic or --integration generic")
+            console.print("[dim]Example: specify init my-project --integration generic --integration-options=\"--commands-dir .myagent/commands/\"[/dim]")
             raise typer.Exit(1)
-    elif ai_commands_dir:
-        console.print(f"[red]Error:[/red] --ai-commands-dir can only be used with --ai generic (not '{selected_ai}')")
+    elif ai_commands_dir and not use_integration:
+        console.print(
+            f"[red]Error:[/red] --ai-commands-dir can only be used with the "
+            f"'generic' integration via --ai generic or --integration generic "
+            f"(not '{selected_ai}')"
+        )
         raise typer.Exit(1)
 
     current_dir = Path.cwd()
@@ -2210,9 +2247,21 @@ def init(
                 manifest = IntegrationManifest(
                     resolved_integration.key, project_path, version=get_speckit_version()
                 )
+
+                # Forward all legacy CLI flags to the integration as parsed_options.
+                # Integrations receive every option and decide what to use;
+                # irrelevant keys are simply ignored by the integration's setup().
+                integration_parsed_options: dict[str, Any] = {}
+                if ai_commands_dir:
+                    integration_parsed_options["commands_dir"] = ai_commands_dir
+                if ai_skills:
+                    integration_parsed_options["skills"] = True
+
                 resolved_integration.setup(
                     project_path, manifest,
+                    parsed_options=integration_parsed_options or None,
                     script_type=selected_script,
+                    raw_options=integration_options,
                 )
                 manifest.save()
 
@@ -2268,7 +2317,7 @@ def init(
                         shutil.rmtree(project_path)
                     raise typer.Exit(1)
             # For generic agent, rename placeholder directory to user-specified path
-            if selected_ai == "generic" and ai_commands_dir:
+            if not use_integration and selected_ai == "generic" and ai_commands_dir:
                 placeholder_dir = project_path / ".speckit" / "commands"
                 target_dir = project_path / ai_commands_dir
                 if placeholder_dir.is_dir():
@@ -2284,18 +2333,19 @@ def init(
             ensure_constitution_from_template(project_path, tracker=tracker)
 
             # Determine skills directory and migrate any legacy Kimi dotted skills.
+            # (Legacy path only — integration path handles skills in setup().)
             migrated_legacy_kimi_skills = 0
             removed_legacy_kimi_skills = 0
             skills_dir: Optional[Path] = None
-            if selected_ai in NATIVE_SKILLS_AGENTS:
+            if not use_integration and selected_ai in NATIVE_SKILLS_AGENTS:
                 skills_dir = _get_skills_dir(project_path, selected_ai)
                 if selected_ai == "kimi" and skills_dir.is_dir():
                     (
                         migrated_legacy_kimi_skills,
                         removed_legacy_kimi_skills,
                     ) = _migrate_legacy_kimi_dotted_skills(skills_dir)
 
-            if ai_skills:
+            if not use_integration and ai_skills:
                 if selected_ai in NATIVE_SKILLS_AGENTS:
                     bundled_found = _has_bundled_skills(project_path, selected_ai)
                     if bundled_found:
@@ -2383,6 +2433,11 @@ def init(
             }
             if use_integration:
                 init_opts["integration"] = resolved_integration.key
+                # Ensure ai_skills is set for SkillsIntegration so downstream
+                # tools (extensions, presets) emit SKILL.md overrides correctly.
+                from .integrations.base import SkillsIntegration as _SkillsPersist
+                if isinstance(resolved_integration, _SkillsPersist):
+                    init_opts["ai_skills"] = True
             save_init_options(project_path, init_opts)
 
             # Install preset if specified
@@ -2484,17 +2539,27 @@ def init(
         steps_lines.append("1. You're already in the project directory!")
         step_num = 2
 
-    if selected_ai == "codex" and ai_skills:
-        steps_lines.append(f"{step_num}. Start Codex in this project directory; spec-kit skills were installed to [cyan].agents/skills[/cyan]")
-        step_num += 1
+    # Determine skill display mode for the next-steps panel.
+    # Skills integrations (codex, kimi, agy) should show skill invocation syntax
+    # regardless of whether --ai-skills was explicitly passed.
+    _is_skills_integration = False
+    if use_integration:
+        from .integrations.base import SkillsIntegration as _SkillsInt
+        _is_skills_integration = isinstance(resolved_integration, _SkillsInt)
 
-    codex_skill_mode = selected_ai == "codex" and ai_skills
+    codex_skill_mode = selected_ai == "codex" and (ai_skills or _is_skills_integration)
     kimi_skill_mode = selected_ai == "kimi"
-    native_skill_mode = codex_skill_mode or kimi_skill_mode
+    agy_skill_mode = selected_ai == "agy" and _is_skills_integration
+    native_skill_mode = codex_skill_mode or kimi_skill_mode or agy_skill_mode
+
+    if codex_skill_mode and not ai_skills:
+        # Integration path installed skills; show the helpful notice
+        steps_lines.append(f"{step_num}. Start Codex in this project directory; spec-kit skills were installed to [cyan].agents/skills[/cyan]")
+        step_num += 1
     usage_label = "skills" if native_skill_mode else "slash commands"
 
     def _display_cmd(name: str) -> str:
-        if codex_skill_mode:
+        if codex_skill_mode or agy_skill_mode:
             return f"$speckit-{name}"
         if kimi_skill_mode:
             return f"/skill:speckit-{name}"
 
@@ -168,6 +168,12 @@ class CommandRegistrar:
             "format": "markdown",
             "args": "$ARGUMENTS",
             "extension": ".md"
+        },
+        "agy": {
+            "dir": ".agent/skills",
+            "format": "markdown",
+            "args": "$ARGUMENTS",
+            "extension": "/SKILL.md",
         }
     }
 
 
@@ -46,17 +46,21 @@ def _register_builtins() -> None:
     users install and invoke.
     """
     # -- Imports (alphabetical) -------------------------------------------
+    from .agy import AgyIntegration
     from .amp import AmpIntegration
     from .auggie import AuggieIntegration
     from .bob import BobIntegration
     from .claude import ClaudeIntegration
+    from .codex import CodexIntegration
     from .codebuddy import CodebuddyIntegration
     from .copilot import CopilotIntegration
     from .cursor_agent import CursorAgentIntegration
     from .gemini import GeminiIntegration
+    from .generic import GenericIntegration
     from .iflow import IflowIntegration
     from .junie import JunieIntegration
     from .kilocode import KilocodeIntegration
+    from .kimi import KimiIntegration
     from .kiro_cli import KiroCliIntegration
     from .opencode import OpencodeIntegration
     from .pi import PiIntegration
@@ -70,17 +74,21 @@ def _register_builtins() -> None:
     from .windsurf import WindsurfIntegration
 
     # -- Registration (alphabetical) --------------------------------------
+    _register(AgyIntegration())
     _register(AmpIntegration())
     _register(AuggieIntegration())
     _register(BobIntegration())
     _register(ClaudeIntegration())
+    _register(CodexIntegration())
     _register(CodebuddyIntegration())
     _register(CopilotIntegration())
     _register(CursorAgentIntegration())
     _register(GeminiIntegration())
+    _register(GenericIntegration())
     _register(IflowIntegration())
     _register(JunieIntegration())
     _register(KilocodeIntegration())
+    _register(KimiIntegration())
     _register(KiroCliIntegration())
     _register(OpencodeIntegration())
     _register(PiIntegration())
 
@@ -0,0 +1,41 @@
+"""Antigravity (agy) integration — skills-based agent.
+
+Antigravity uses ``.agent/skills/speckit-<name>/SKILL.md`` layout.
+Explicit command support was deprecated in version 1.20.5;
+``--skills`` defaults to ``True``.
+"""
+
+from __future__ import annotations
+
+from ..base import IntegrationOption, SkillsIntegration
+
+
+class AgyIntegration(SkillsIntegration):
+    """Integration for Antigravity IDE."""
+
+    key = "agy"
+    config = {
+        "name": "Antigravity",
+        "folder": ".agent/",
+        "commands_subdir": "skills",
+        "install_url": None,
+        "requires_cli": False,
+    }
+    registrar_config = {
+        "dir": ".agent/skills",
+        "format": "markdown",
+        "args": "$ARGUMENTS",
+        "extension": "/SKILL.md",
+    }
+    context_file = "AGENTS.md"
+
+    @classmethod
+    def options(cls) -> list[IntegrationOption]:
+        return [
+            IntegrationOption(
+                "--skills",
+                is_flag=True,
+                default=True,
+                help="Install as agent skills (default for Antigravity since v1.20.5)",
+            ),
+        ]
@@ -0,0 +1,17 @@
+# update-context.ps1 — Antigravity (agy) integration: create/update AGENTS.md
+#
+# Thin wrapper that delegates to the shared update-agent-context script.
+
+$ErrorActionPreference = 'Stop'
+
+$scriptDir = Split-Path -Parent $MyInvocation.MyCommand.Definition
+$repoRoot = try { git rev-parse --show-toplevel 2>$null } catch { $null }
+if (-not $repoRoot -or -not (Test-Path (Join-Path $repoRoot '.specify'))) {
+    $repoRoot = $scriptDir
+    $fsRoot = [System.IO.Path]::GetPathRoot($repoRoot)
+    while ($repoRoot -and $repoRoot -ne $fsRoot -and -not (Test-Path (Join-Path $repoRoot '.specify'))) {
+        $repoRoot = Split-Path -Parent $repoRoot
+    }
+}
+
+& "$repoRoot/.specify/scripts/powershell/update-agent-context.ps1" -AgentType agy
@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+# update-context.sh — Antigravity (agy) integration: create/update AGENTS.md
+#
+# Thin wrapper that delegates to the shared update-agent-context script.
+
+set -euo pipefail
+
+_script_dir="$(cd "$(dirname "$0")" && pwd)"
+_root="$_script_dir"
+while [ "$_root" != "/" ] && [ ! -d "$_root/.specify" ]; do _root="$(dirname "$_root")"; done
+if [ -z "${REPO_ROOT:-}" ]; then
+  if [ -d "$_root/.specify" ]; then
+    REPO_ROOT="$_root"
+  else
+    git_root="$(git rev-parse --show-toplevel 2>/dev/null || true)"
+    if [ -n "$git_root" ] && [ -d "$git_root/.specify" ]; then
+      REPO_ROOT="$git_root"
+    else
+      REPO_ROOT="$_root"
+    fi
+  fi
+fi
+
+exec "$REPO_ROOT/.specify/scripts/bash/update-agent-context.sh" agy
Original file line number	Diff line number	Diff line change
`@@ -168,6 +168,12 @@ class CommandRegistrar:`
`168`	`168`	`"format": "markdown",`
`169`	`169`	`"args": "$ARGUMENTS",`
`170`	`170`	`"extension": ".md"`
	`171`	`+ },`
	`172`	`+ "agy": {`
	`173`	`+ "dir": ".agent/skills",`
	`174`	`+ "format": "markdown",`
	`175`	`+ "args": "$ARGUMENTS",`
	`176`	`+ "extension": "/SKILL.md",`
`171`	`177`	`}`
`172`	`178`	`}`
`173`	`179`