diff --git a/scripts/check_review_completeness.py b/scripts/check_review_completeness.py
new file mode 100644
index 00000000..f60b3560
--- /dev/null
+++ b/scripts/check_review_completeness.py
@@ -0,0 +1,80 @@
+"""Check review requests for completeness before submission."""
+
+from __future__ import annotations
+
+import json
+import sys
+from pathlib import Path
+
+REQUIRED_FIELDS = {
+    "request_id": "Unique identifier for the review request",
+    "reviewer_role": "Role being requested (e.g., domain_expert, safety_reviewer)",
+    "artifact_refs": "List of artifacts to review (PR URLs, doc paths)",
+    "claim_boundary": "What claim the review is expected to evaluate",
+    "decision_needed": "What decision is needed (approve, reject, defer)",
+    "requested_by": "Name or ID of the person requesting review",
+}
+
+OPTIONAL_FIELDS = {
+    "deadline": "ISO 8601 deadline for the review",
+    "context_notes": "Additional context for the reviewer",
+    "safety_relevant": "Whether the request touches safety policy",
+}
+
+
+def check_completeness(request_path: str) -> dict:
+    p = Path(request_path)
+    if not p.exists():
+        return {"error": f"Request file not found: {request_path}"}
+
+    try:
+        data = json.loads(p.read_text())
+    except json.JSONDecodeError as e:
+        return {"error": f"Invalid JSON: {e}"}
+
+    if not isinstance(data, dict):
+        return {"error": "Request must be a JSON object"}
+
+    missing = []
+    present = []
+
+    for field, desc in REQUIRED_FIELDS.items():
+        if field not in data or data[field] is None or (isinstance(data[field], str) and not data[field].strip()):
+            missing.append({"field": field, "description": desc})
+        else:
+            present.append(field)
+
+    optional_present = [f for f in OPTIONAL_FIELDS if f in data and data[f]]
+
+    return {
+        "request_path": request_path,
+        "valid_json": True,
+        "is_complete": len(missing) == 0,
+        "required_fields_present": len(present),
+        "required_fields_total": len(REQUIRED_FIELDS),
+        "optional_fields_present": len(optional_present),
+        "missing_fields": missing,
+        "fields_present": present,
+    }
+
+
+def main() -> int:
+    import argparse
+    parser = argparse.ArgumentParser(description="Check review request completeness")
+    parser.add_argument("--request", required=True, help="Path to review request JSON")
+    args = parser.parse_args()
+
+    result = check_completeness(args.request)
+    if "error" in result:
+        print(f"Error: {result['error']}", file=sys.stderr)
+        return 2
+
+    print(json.dumps(result, indent=2))
+    if not result["is_complete"]:
+        print(f"\nMissing {len(result['missing_fields'])} required fields.")
+        return 3
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())
diff --git a/tests/test_check_review_completeness.py b/tests/test_check_review_completeness.py
new file mode 100644
index 00000000..a2f260d9
--- /dev/null
+++ b/tests/test_check_review_completeness.py
@@ -0,0 +1,80 @@
+"""Tests for review request completeness checker."""
+import json
+import subprocess
+import sys
+from pathlib import Path
+import pytest
+
+from scripts.check_review_completeness import check_completeness
+
+
+def _make_request(tmp_path, data: dict) -> str:
+    p = Path(tmp_path) / "request.json"
+    p.write_text(json.dumps(data))
+    return str(p)
+
+
+def _valid_request():
+    return {
+        "request_id": "REV-001",
+        "reviewer_role": "domain_expert",
+        "artifact_refs": ["docs/review/EXPERT_REVIEW_PACK.md"],
+        "claim_boundary": "Evaluate whether the candidate panel is credible",
+        "decision_needed": "approve",
+        "requested_by": "PI Name",
+        "deadline": "2026-08-01",
+        "context_notes": "First pilot panel review",
+    }
+
+
+def test_complete_request(tmp_path):
+    r = check_completeness(_make_request(tmp_path, _valid_request()))
+    assert r["is_complete"] is True
+
+
+def test_missing_required_field(tmp_path):
+    d = _valid_request()
+    del d["decision_needed"]
+    r = check_completeness(_make_request(tmp_path, d))
+    assert r["is_complete"] is False
+
+
+def test_empty_required_field(tmp_path):
+    d = _valid_request()
+    d["reviewer_role"] = ""
+    r = check_completeness(_make_request(tmp_path, d))
+    assert r["is_complete"] is False
+
+
+def test_missing_multiple_fields(tmp_path):
+    d = _valid_request()
+    del d["artifact_refs"]
+    del d["claim_boundary"]
+    r = check_completeness(_make_request(tmp_path, d))
+    assert len(r["missing_fields"]) >= 2
+
+
+def test_missing_file():
+    r = check_completeness("/nonexistent.json")
+    assert "error" in r
+
+
+def test_invalid_json(tmp_path):
+    p = Path(tmp_path) / "bad.json"
+    p.write_text("not json")
+    r = check_completeness(str(p))
+    assert "error" in r
+
+
+def test_cli_valid(tmp_path):
+    p = _make_request(tmp_path, _valid_request())
+    res = subprocess.run([sys.executable, "scripts/check_review_completeness.py", "--request", p],
+                         capture_output=True, text=True)
+    assert res.returncode == 0
+
+
+def test_cli_invalid(tmp_path):
+    p = _make_request(tmp_path, {"id": "incomplete"})
+    res = subprocess.run([sys.executable, "scripts/check_review_completeness.py", "--request", p],
+                         capture_output=True, text=True)
+    assert res.returncode == 3