diff --git a/scripts/consistency_check.py b/scripts/consistency_check.py
index 84a5183..9ad670f 100644
--- a/scripts/consistency_check.py
+++ b/scripts/consistency_check.py
@@ -33,6 +33,7 @@ Checks:
   C-28  inbox-stale-unread       WARN  No   Unread inbox messages older than INBOX_STALE_DAYS
   C-29  inbox-work-unpromoted    WARN  No   Stale unread message looks like a multi-step work request without a workplan
   C-30  scope-current-state-stale WARN No   SCOPE.md Current State contradicts live workplan statuses
+  C-31  work-record-unregistered  WARN No   YAML-block id matches no kind in the canon work-record type registry (sidetrack detector, CUST-WP-0060)
 
 Usage:
     python scripts/consistency_check.py --repo SLUG [--fix] [--no-writeback] [--json] [--api-base URL]
@@ -772,6 +773,82 @@ def _infer_slug_from_path(api_base: str, path: str) -> "tuple[str, str] | None":
     return None
 
 
+_WORK_RECORD_FENCE_RE = re.compile(r"```(?:yaml|task)\n(.*?)```", re.S)
+_WORK_RECORD_ID_LINE_RE = re.compile(r"^id:\s*[\"']?([A-Za-z0-9_-]+)[\"']?\s*$", re.M)
+_WORK_RECORD_ID_LIKE_RE = re.compile(r"^[A-Z][A-Z0-9]*(-[A-Z0-9]+)+$")
+_WORK_RECORD_SKIP_DIRS = frozenset({".git", "node_modules", ".venv", "history"})
+
+
+def _load_work_record_patterns() -> list[re.Pattern] | None:
+    """Load id patterns from the canon work-record type registry.
+
+    Location: $WORK_RECORD_REGISTRY, else ~/the-custodian/canon/standards/
+    work-record-types.yaml. Returns None (check skipped) when unavailable.
+    """
+    if not _HAS_YAML:
+        return None
+    candidates = []
+    env = os.environ.get("WORK_RECORD_REGISTRY")
+    if env:
+        candidates.append(Path(env))
+    candidates.append(
+        Path.home() / "the-custodian/canon/standards/work-record-types.yaml")
+    for path in candidates:
+        if not path.is_file():
+            continue
+        try:
+            reg = _yaml.safe_load(path.read_text())
+            patterns = []
+            for kind in reg.get("kinds", []):
+                patterns += [re.compile(p) for p in kind.get("id_patterns", [])]
+                patterns += [re.compile(lp["pattern"])
+                             for lp in kind.get("legacy_patterns", [])]
+            return patterns
+        except Exception:
+            return None
+    return None
+
+
+def _check_unregistered_work_records(repo_dir: Path, report: "ConsistencyReport") -> None:
+    """C-31: warn on YAML-block ids matching no registered work-record kind.
+
+    Detection only (CUST-WP-0060-T05); registration of non-workplan kinds is
+    a later stage. An unregistered id scheme is a coordination sidetrack that
+    will need manual reintegration — surface it the day it appears.
+    """
+    patterns = _load_work_record_patterns()
+    if patterns is None:
+        return
+    seen: set[str] = set()
+    for md in sorted(repo_dir.rglob("*.md")):
+        if any(part in _WORK_RECORD_SKIP_DIRS for part in md.parts):
+            continue
+        try:
+            text = md.read_text(errors="replace")
+        except OSError:
+            continue
+        for body in _WORK_RECORD_FENCE_RE.findall(text):
+            for rid in _WORK_RECORD_ID_LINE_RE.findall(body):
+                if rid in seen or "NNN" in rid or rid.endswith("-TNN"):
+                    continue
+                if not _WORK_RECORD_ID_LIKE_RE.match(rid):
+                    continue
+                if any(p.match(rid) for p in patterns):
+                    continue
+                seen.add(rid)
+                report.add(
+                    severity="WARN",
+                    check_id="C-31",
+                    message=(
+                        f"[{md.relative_to(repo_dir)}] id '{rid}' matches no "
+                        f"kind in the canon work-record type registry — "
+                        f"unregistered species become sidetracks needing "
+                        f"manual reintegration (work-record-types_v0.1)"
+                    ),
+                    fixable=False,
+                )
+
+
 def check_repo(api_base: str, repo_slug: str, repo_path_override: str | None = None) -> ConsistencyReport:
     """Run all consistency checks for a registered repo."""
     repo = _api_get(api_base, f"/repos/{repo_slug}", return_error=True)
@@ -835,6 +912,9 @@ def check_repo(api_base: str, repo_slug: str, repo_path_override: str | None = N
             fixable=False,
         )
 
+    # C-31: work-record sidetrack detector (canon work-record-types registry)
+    _check_unregistered_work_records(repo_dir, report)
+
     # C-01: workplans/ directory missing
     if not workplans_dir.is_dir():
         report.add(