diff --git a/testing/ci/publish_metrics.py b/testing/ci/publish_metrics.py
index 2039c01..7ccb145 100644
--- a/testing/ci/publish_metrics.py
+++ b/testing/ci/publish_metrics.py
@@ -29,11 +29,11 @@ def _build_parser() -> argparse.ArgumentParser:
     return parser
 
 
-def _load_quality_report(path: Path) -> tuple[float, int, dict[str, str]]:
+def _load_quality_report(path: Path) -> tuple[float, int, int, dict[str, str]]:
     """Read workspace coverage/LOC summary from the quality gate JSON output."""
 
     if not path.exists():
-        return 0.0, 0, {
+        return 0.0, 0, 0, {
             "tests": "not_applicable",
             "coverage": "not_applicable",
             "loc": "not_applicable",
@@ -49,6 +49,10 @@ def _load_quality_report(path: Path) -> tuple[float, int, dict[str, str]]:
     source_lines = payload.get("source_lines_over_500")
     if not isinstance(source_lines, int):
         source_lines = 0
+    source_files = payload.get("source_files_total")
+    if not isinstance(source_files, int):
+        managed_files = payload.get("managed_files")
+        source_files = len(managed_files) if isinstance(managed_files, list) else 0
     issue_checks = [item.get("check") for item in payload.get("issues", []) if isinstance(item, dict)]
     docs_failed = any(str(check).lower() in {"docstring", "docs", "naming"} for check in issue_checks)
     coverage_failed = any(str(check).lower() == "coverage" for check in issue_checks)
@@ -95,7 +99,7 @@ def _load_quality_report(path: Path) -> tuple[float, int, dict[str, str]]:
                         checks["supply_chain"] = "failed" if ironbank_required else "not_applicable"
         except Exception:
             checks["supply_chain"] = "failed" if ironbank_required else "not_applicable"
-    return float(coverage), int(source_lines), checks
+    return float(coverage), int(source_files), int(source_lines), checks
 
 
 def main(argv: list[str] | None = None) -> int:
@@ -106,7 +110,7 @@ def main(argv: list[str] | None = None) -> int:
     junit_paths = [Path(path) for path in args.junit]
     summary = load_junit_summary(junit_paths)
     test_cases = load_junit_cases(junit_paths)
-    coverage_percent, source_lines_over_500, checks = _load_quality_report(Path(args.quality_report))
+    coverage_percent, source_files_total, source_lines_over_500, checks = _load_quality_report(Path(args.quality_report))
     publish_quality_metrics(
         gateway=args.gateway,
         suite=args.suite,
@@ -114,6 +118,7 @@ def main(argv: list[str] | None = None) -> int:
         status=args.status,
         summary=summary,
         workspace_line_coverage_percent=coverage_percent,
+        source_files_total=source_files_total,
         source_lines_over_500=source_lines_over_500,
         branch=args.branch,
         build_number=args.build_number,
diff --git a/testing/ci/quality_gate.py b/testing/ci/quality_gate.py
index 7c16b54..8813e2d 100644
--- a/testing/ci/quality_gate.py
+++ b/testing/ci/quality_gate.py
@@ -330,6 +330,9 @@ def run_gate(contract_path: Path, *, backend_coverage: Path, frontend_coverage:
         frontend_report=frontend_coverage,
     )
     workspace_line_coverage_percent = round(sum(coverage_values) / len(coverage_values), 3) if coverage_values else 0.0
+    source_files_total = sum(
+        1 for path in managed_files if path.exists() and path.suffix.lower() in TEXT_EXTENSIONS
+    )
     source_lines_over_500 = sum(1 for issue in issues if issue.check == "loc")
     report = {
         "managed_files": [str(path.relative_to(ROOT)) for path in managed_files],
@@ -338,6 +341,7 @@ def run_gate(contract_path: Path, *, backend_coverage: Path, frontend_coverage:
         "max_lines": max_lines,
         "coverage_threshold_pct": threshold,
         "workspace_line_coverage_percent": workspace_line_coverage_percent,
+        "source_files_total": source_files_total,
         "source_lines_over_500": source_lines_over_500,
         "issue_count": len(issues),
         "issues": [issue.__dict__ for issue in issues],
diff --git a/testing/ci/summary.py b/testing/ci/summary.py
index ae90c97..970208d 100644
--- a/testing/ci/summary.py
+++ b/testing/ci/summary.py
@@ -124,6 +124,7 @@ def render_payload(
     failed: int,
     summary: RunSummary,
     workspace_line_coverage_percent: float = 0.0,
+    source_files_total: int = 0,
     source_lines_over_500: int = 0,
     branch: str = "",
     build_number: str = "",
@@ -150,6 +151,8 @@ def render_payload(
         f'bstein_home_quality_gate_tests_total{{suite="{suite}",result="skipped"}} {summary.skipped}\n'
         "# TYPE platform_quality_gate_workspace_line_coverage_percent gauge\n"
         f'platform_quality_gate_workspace_line_coverage_percent{{suite="{suite}"}} {workspace_line_coverage_percent:.3f}\n'
+        "# TYPE platform_quality_gate_source_files_total gauge\n"
+        f'platform_quality_gate_source_files_total{{suite="{suite}"}} {int(source_files_total)}\n'
         "# TYPE platform_quality_gate_source_lines_over_500_total gauge\n"
         f'platform_quality_gate_source_lines_over_500_total{{suite="{suite}"}} {int(source_lines_over_500)}\n'
         "# TYPE platform_quality_gate_build_info gauge\n"
@@ -183,6 +186,7 @@ def publish_quality_metrics(
     status: str,
     summary: RunSummary,
     workspace_line_coverage_percent: float = 0.0,
+    source_files_total: int = 0,
     source_lines_over_500: int = 0,
     branch: str = "",
     build_number: str = "",
@@ -218,6 +222,7 @@ def publish_quality_metrics(
         failed=int(counters["failed"]),
         summary=summary,
         workspace_line_coverage_percent=workspace_line_coverage_percent,
+        source_files_total=source_files_total,
         source_lines_over_500=source_lines_over_500,
         branch=branch,
         build_number=build_number,
diff --git a/testing/tests/test_publish_metrics.py b/testing/tests/test_publish_metrics.py
index 2ae47c1..8dd667d 100644
--- a/testing/tests/test_publish_metrics.py
+++ b/testing/tests/test_publish_metrics.py
@@ -25,6 +25,7 @@ def test_load_junit_summary_combines_suites(tmp_path: Path) -> None:
     assert 'platform_quality_gate_runs_total{suite="bstein_home",status="ok"} 2' in payload
     assert 'bstein_home_quality_gate_tests_total{suite="bstein_home",result="skipped"} 1' in payload
     assert 'platform_quality_gate_workspace_line_coverage_percent{suite="bstein_home"} 0.000' in payload
+    assert 'platform_quality_gate_source_files_total{suite="bstein_home"} 0' in payload
     assert 'platform_quality_gate_source_lines_over_500_total{suite="bstein_home"} 0' in payload
 
 
diff --git a/testing/tests/test_quality_gate.py b/testing/tests/test_quality_gate.py
index fe523cb..a6151dc 100644
--- a/testing/tests/test_quality_gate.py
+++ b/testing/tests/test_quality_gate.py
@@ -160,6 +160,7 @@ def test_run_gate_reports_workspace_coverage_and_loc_totals(tmp_path: Path) -> N
 
         assert any(issue.check == "loc" for issue in issues)
         assert report["workspace_line_coverage_percent"] == 100.0
+        assert report["source_files_total"] == 2
         assert report["source_lines_over_500"] == 1
     finally:
         quality_gate_module.ROOT = root_before