diff --git a/src/cifflow/dictionary/ddlm_parser.py b/src/cifflow/dictionary/ddlm_parser.py
index fc4124c..15f32ba 100644
--- a/src/cifflow/dictionary/ddlm_parser.py
+++ b/src/cifflow/dictionary/ddlm_parser.py
@@ -59,3 +59,17 @@ class DdlmDictionary:
     warnings: list[str] = field(default_factory=list)
     source_files: list[str] = field(default_factory=list)
     uri: str | None = None
+
+    @property
+    def has_warnings(self) -> bool:
+        """Return True if any non-fatal issues were recorded during loading.
+
+        Warnings range from purely informational (e.g. a dictionary with
+        multiple data blocks) to significant (e.g. a skipped import).  A
+        dictionary with warnings is not necessarily unusable; inspect
+        :attr:`warnings` to determine severity.
+        """
+        return bool(self.warnings)
+
+    # def __bool__(self) -> bool:
+    #     return self.is_valid
diff --git a/tasks/todo.md b/tasks/todo.md
index 0c644e7..b5e7cbf 100644
--- a/tasks/todo.md
+++ b/tasks/todo.md
@@ -49,9 +49,13 @@ Decomposed all F-grade and all 6 reducible E-grade functions into private helper
      ingest a real `.cif` to file-backed SQLite, emit to `.cif` and re-ingest, property-based
      tests for `_BlockData` helpers.
 
-  4. **Unify severity levels** across parser/ingest/validation — audit every `on_error` /
-     `ParseError` site; assign `'Error' | 'Warning' | 'Info'`; standardise message phrasing;
-     decide `ingest()` return type.
+  4. **Unify severity levels** across parser/ingest/validation/dictionary — audit every `on_error` /
+     `ParseError` site and every `warn()` call in `loader.py`; assign `'Error' | 'Warning' | 'Info'`;
+     standardise message phrasing; decide `ingest()` return type.  Dictionary warnings currently span
+     the full range from purely informational ("has 2 data blocks — using first") to effectively fatal
+     ("contains no data blocks"), making `DdlmDictionary.is_valid` / `__bool__` meaningless as a
+     single threshold.  Fix requires classifying each warning site before exposing validity on the
+     public API.
 
   6. **`CifBuilder` cross-type duplicate tag detection** — scalar-then-loop silently loses
      scalar; loop-then-scalar makes loop structurally inconsistent. Fix in `builder.py` with