diff --git a/src/specify_cli/integrations/agy/__init__.py b/src/specify_cli/integrations/agy/__init__.py
index d62bafad40..244f95e4f0 100644
--- a/src/specify_cli/integrations/agy/__init__.py
+++ b/src/specify_cli/integrations/agy/__init__.py
@@ -5,6 +5,7 @@
 
 from __future__ import annotations
 
+import re
 from pathlib import Path
 from typing import TYPE_CHECKING, Any
 
@@ -13,6 +14,15 @@
 if TYPE_CHECKING:
     from ..manifest import IntegrationManifest
 
+# Note injected into hook sections so agy maps dot-notation command
+# names (from extensions.yml) to the hyphenated skill names it uses.
+# Without this, agy emits ``/speckit.git.commit`` (which does not
+# resolve) instead of ``/speckit-git-commit``.
+_HOOK_COMMAND_NOTE = (
+    "- When constructing slash commands from hook command names, "
+    "replace dots (`.`) with hyphens (`-`). "
+    "For example, `speckit.git.commit` → `/speckit-git-commit`.\n"
+)
 
 
 class AgyIntegration(SkillsIntegration):
@@ -23,8 +33,8 @@ class AgyIntegration(SkillsIntegration):
         "name": "Antigravity",
         "folder": ".agents/",
         "commands_subdir": "skills",
-        "install_url": None,
-        "requires_cli": False,
+        "install_url": "https://antigravity.google/",
+        "requires_cli": True,
     }
     registrar_config = {
         "dir": ".agents/skills",
@@ -34,6 +44,54 @@ class AgyIntegration(SkillsIntegration):
     }
     context_file = "AGENTS.md"
 
+    @staticmethod
+    def _inject_hook_command_note(content: str) -> str:
+        """Insert a dot-to-hyphen note before each hook output instruction.
+
+        Targets the line ``- For each executable hook, output the following``
+        and inserts the note on the line before it, matching its indentation.
+        Skips if the note is already present.
+        """
+        if "replace dots" in content:
+            return content
+
+        def repl(m: re.Match[str]) -> str:
+            indent = m.group(1)
+            instruction = m.group(2)
+            # ``eol`` is empty when the regex matched via ``$`` because the
+            # instruction was the final line of a file with no trailing
+            # newline. Default to ``\n`` so the note never collapses onto
+            # the same line as the instruction.
+            eol = m.group(3) or "\n"
+            return (
+                indent
+                + _HOOK_COMMAND_NOTE.rstrip("\n")
+                + eol
+                + indent
+                + instruction
+                + eol
+            )
+
+        return re.sub(
+            r"(?m)^(\s*)(- For each executable hook, output the following[^\r\n]*)(\r\n|\n|$)",
+            repl,
+            content,
+        )
+
+    def post_process_skill_content(self, content: str) -> str:
+        """Inject the dot-to-hyphen hook command note."""
+        return self._inject_hook_command_note(content)
+
+    def build_exec_args(
+        self,
+        prompt: str,
+        *,
+        model: str | None = None,
+        output_json: bool = True,
+    ) -> list[str] | None:
+        # agy does not support --model or JSON output; both params are ignored
+        return ["agy", "--print", prompt]
+
     def setup(
         self,
         project_root: Path,
@@ -49,4 +107,21 @@ def setup(
             fg="yellow",
             err=True,
         )
-        return super().setup(project_root, manifest, parsed_options=parsed_options, **opts)
+        created = super().setup(project_root, manifest, parsed_options=parsed_options, **opts)
+
+        skills_dir = self.skills_dest(project_root).resolve()
+        for path in created:
+            try:
+                path.resolve().relative_to(skills_dir)
+            except ValueError:
+                continue
+            if path.name != "SKILL.md":
+                continue
+
+            content = path.read_bytes().decode("utf-8")
+            updated = self.post_process_skill_content(content)
+            if updated != content:
+                path.write_bytes(updated.encode("utf-8"))
+                self.record_file_in_manifest(path, project_root, manifest)
+
+        return created
diff --git a/tests/integrations/test_integration_agy.py b/tests/integrations/test_integration_agy.py
index b95caf3bee..78014ce814 100644
--- a/tests/integrations/test_integration_agy.py
+++ b/tests/integrations/test_integration_agy.py
@@ -1,5 +1,7 @@
 """Tests for AgyIntegration (Antigravity)."""
 
+from specify_cli.integrations import get_integration
+
 from .test_integration_base_skills import SkillsIntegrationTests
 
 
@@ -12,10 +14,21 @@ class TestAgyIntegration(SkillsIntegrationTests):
 
     def test_options_include_skills_flag(self):
         """Override inherited test: AgyIntegration should not expose a --skills flag because .agents/ is its only layout."""
-        from specify_cli.integrations import get_integration
         i = get_integration(self.KEY)
         skills_opts = [o for o in i.options() if o.name == "--skills"]
         assert len(skills_opts) == 0
+
+    def test_requires_cli_is_true(self):
+        """agy is a CLI tool; requires_cli must be True."""
+        i = get_integration(self.KEY)
+        assert i.config["requires_cli"] is True
+
+    def test_install_url_is_set(self):
+        """install_url must point to the official installation page."""
+        i = get_integration(self.KEY)
+        assert i.config["install_url"] == "https://antigravity.google/"
+
+
 class TestAgyAutoPromote:
     """--ai agy auto-promotes to integration path."""
 
@@ -36,10 +49,87 @@ def test_agy_setup_warning(self, tmp_path):
         from typer.testing import CliRunner
         from specify_cli import app
 
-        # Click >= 8.2 separates stdout and stderr natively, mix_stderr is removed
+        # Click >= 8.2 separates stdout and stderr natively
         runner = CliRunner()
         target = tmp_path / "test-proj2"
         result = runner.invoke(app, ["init", str(target), "--ai", "agy", "--no-git", "--script", "sh"])
 
         assert result.exit_code == 0
         assert "Warning: The .agents/ layout requires Antigravity v1.20.5 or newer" in result.stderr
+
+
+class TestAgyBuildExecArgs:
+    """agy non-interactive execution argument building."""
+
+    def test_build_exec_args_returns_print_command(self):
+        """build_exec_args should return ['agy', '--print', prompt]."""
+        from specify_cli.integrations import get_integration
+        i = get_integration("agy")
+        result = i.build_exec_args("describe my feature")
+        assert result == ["agy", "--print", "describe my feature"]
+
+    def test_build_exec_args_ignores_model(self):
+        """agy does not support --model; model param must be ignored."""
+        from specify_cli.integrations import get_integration
+        i = get_integration("agy")
+        result = i.build_exec_args("my prompt", model="gemini-pro")
+        assert result == ["agy", "--print", "my prompt"]
+
+    def test_build_exec_args_ignores_output_json(self):
+        """agy does not support JSON output; output_json param must be ignored."""
+        from specify_cli.integrations import get_integration
+        i = get_integration("agy")
+        result = i.build_exec_args("my prompt", output_json=False)
+        assert result == ["agy", "--print", "my prompt"]
+
+
+class TestAgyHookCommandNote:
+    """Verify dot-to-hyphen normalization note is injected into hook sections."""
+
+    def test_hook_note_injected_in_skills_with_hooks(self, tmp_path):
+        """Skills with hook sections should contain the normalization note."""
+        from specify_cli.integrations import get_integration
+        from specify_cli.integrations.manifest import IntegrationManifest
+
+        i = get_integration("agy")
+        m = IntegrationManifest("agy", tmp_path)
+        i.setup(tmp_path, m, script_type="sh")
+        specify_skill = tmp_path / ".agents/skills/speckit-specify/SKILL.md"
+        assert specify_skill.exists()
+        content = specify_skill.read_text(encoding="utf-8")
+        assert "replace dots" in content, (
+            "speckit-specify should have dot-to-hyphen hook note"
+        )
+
+    def test_hook_note_not_in_skills_without_hooks(self):
+        """Skills without hook sections should not get the note."""
+        from specify_cli.integrations.agy import AgyIntegration
+
+        content = "---\nname: test\ndescription: test\n---\n\nNo hooks here.\n"
+        result = AgyIntegration._inject_hook_command_note(content)
+        assert "replace dots" not in result
+
+    def test_hook_note_idempotent(self):
+        """Injecting the note twice must not duplicate it."""
+        from specify_cli.integrations.agy import AgyIntegration
+
+        content = (
+            "---\nname: test\n---\n\n"
+            "- For each executable hook, output the following based on its flag:\n"
+        )
+        once = AgyIntegration._inject_hook_command_note(content)
+        twice = AgyIntegration._inject_hook_command_note(once)
+        assert once == twice, "Hook note injection should be idempotent"
+
+    def test_hook_note_preserves_indentation(self):
+        """The injected note must match the indentation of the target line."""
+        from specify_cli.integrations.agy import AgyIntegration
+
+        content = (
+            "---\nname: test\n---\n\n"
+            "   - For each executable hook, output the following\n"
+        )
+        result = AgyIntegration._inject_hook_command_note(content)
+        lines = result.splitlines()
+        note_line = [l for l in lines if "replace dots" in l][0]
+        assert note_line.startswith("   "), "Note should preserve indentation"