diff --git a/mergify_cli/ci/scopes/cli.py b/mergify_cli/ci/scopes/cli.py
index 7d765dc..432178a 100644
--- a/mergify_cli/ci/scopes/cli.py
+++ b/mergify_cli/ci/scopes/cli.py
@@ -75,6 +75,25 @@ def maybe_write_github_outputs(
         )
 
 
+def maybe_write_github_step_summary(
+    base: str,
+    all_scopes: abc.Iterable[str],
+    scopes_hit: set[str],
+) -> None:
+    gha = os.environ.get("GITHUB_STEP_SUMMARY")
+    if not gha:
+        return
+    # Build a pretty Markdown table with emojis
+    markdown = f"## Mergify CI Scope Matching Results for `{base}...HEAD`\n\n"
+    markdown += "| 🎯 Scope | ✅ Match |\n|:--|:--|\n"
+    for scope in sorted(all_scopes):
+        emoji = "✅" if scope in scopes_hit else "❌"
+        markdown += f"| `{scope}` | {emoji} |\n"
+
+    with pathlib.Path(gha).open("a", encoding="utf-8") as fh:
+        fh.write(markdown)
+
+
 class InvalidDetectedScopeError(exceptions.ScopesError):
     pass
 
@@ -136,6 +155,7 @@ def detect(config_path: str) -> DetectedScope:
         click.echo("No scopes matched.")
 
     maybe_write_github_outputs(all_scopes, scopes_hit)
+    maybe_write_github_step_summary(base.ref, all_scopes, scopes_hit)
     return DetectedScope(base_ref=base.ref, scopes=scopes_hit)
 
 
diff --git a/mergify_cli/tests/ci/scopes/test_cli.py b/mergify_cli/tests/ci/scopes/test_cli.py
index 17fa06b..0e75880 100644
--- a/mergify_cli/tests/ci/scopes/test_cli.py
+++ b/mergify_cli/tests/ci/scopes/test_cli.py
@@ -292,6 +292,30 @@ def test_maybe_write_github_outputs(
     assert """{"backend": "true", "docs": "true", "frontend": "false"}""" in content
 
 
+def test_maybe_write_github_step_summary(
+    tmp_path: pathlib.Path,
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    output_file = tmp_path / "github_step_summary"
+    monkeypatch.setenv("GITHUB_STEP_SUMMARY", str(output_file))
+
+    all_scopes = ["backend", "frontend", "docs"]
+    scopes_hit = {"backend", "docs"}
+
+    cli.maybe_write_github_step_summary("da26838", all_scopes, scopes_hit)
+
+    content = output_file.read_text()
+    expected = """## Mergify CI Scope Matching Results for `da26838...HEAD`
+
+| 🎯 Scope | ✅ Match |
+|:--|:--|
+| `backend` | ✅ |
+| `docs` | ✅ |
+| `frontend` | ❌ |
+"""
+    assert content == expected
+
+
 def test_maybe_write_github_outputs_no_env(
     monkeypatch: pytest.MonkeyPatch,
 ) -> None: