diff --git a/src/specify_cli/extensions/__init__.py b/src/specify_cli/extensions/__init__.py
index 0936e5a445..61cbaac89f 100644
--- a/src/specify_cli/extensions/__init__.py
+++ b/src/specify_cli/extensions/__init__.py
@@ -285,9 +285,25 @@ def _validate(self):
             raise ValidationError(
                 f"Invalid extension: expected a mapping, got {type(ext).__name__}"
             )
+        # Check presence AND type: the format/version checks below feed these
+        # values straight to ``re.match`` and ``packaging.Version``, both of
+        # which raise a bare TypeError on a non-string. YAML makes that an easy
+        # authoring slip -- unquoted ``version: 1.0`` parses as a float and
+        # ``id: 2`` as an int -- and TypeError is not a ValidationError, so it
+        # escapes every caller that already handles a malformed manifest (see
+        # list_installed()'s "Corrupted extension" fallback, which catches
+        # ValidationError only, making one bad extension exit ``specify
+        # extension list`` with a raw traceback and hide the healthy ones).
+        # Mirrors the sibling IntegrationDescriptor, which already type-checks
+        # the same four fields.
         for field in ["id", "name", "version", "description"]:
             if field not in ext:
                 raise ValidationError(f"Missing extension.{field}")
+            if not isinstance(ext[field], str):
+                raise ValidationError(
+                    f"Invalid extension.{field}: expected a string, "
+                    f"got {type(ext[field]).__name__}"
+                )
 
         # Validate extension ID format
         if not re.match(r"^[a-z0-9-]+$", ext["id"]):
@@ -391,6 +407,16 @@ def _validate(self):
                 )
             if "name" not in cmd or "file" not in cmd:
                 raise ValidationError("Command missing 'name' or 'file'")
+            # The pattern match below would raise a bare TypeError on a
+            # non-string name (``name: 2``), escaping the ValidationError
+            # contract. The 'file' field needs no check here:
+            # relative_extension_path_violation() below already rejects a
+            # non-string value.
+            if not isinstance(cmd["name"], str):
+                raise ValidationError(
+                    f"Invalid command name: expected a string, "
+                    f"got {type(cmd['name']).__name__}"
+                )
 
             # Validate the 'file' field at manifest-load time using the single
             # shared policy in relative_extension_path_violation(), so manifest
diff --git a/src/specify_cli/presets/__init__.py b/src/specify_cli/presets/__init__.py
index 2f32d162b4..db3ab8b367 100644
--- a/src/specify_cli/presets/__init__.py
+++ b/src/specify_cli/presets/__init__.py
@@ -307,9 +307,25 @@ def _validate(self):
 
         # Validate preset metadata
         pack = self.data["preset"]
+        # Check presence AND type: the format/version checks below feed these
+        # values straight to ``re.match`` and ``packaging.Version``, both of
+        # which raise a bare TypeError on a non-string. YAML makes that an easy
+        # authoring slip -- unquoted ``version: 1.0`` parses as a float and
+        # ``id: 2`` as an int -- and TypeError is not a PresetValidationError,
+        # so it escapes every caller that already handles a malformed manifest
+        # (see list_installed()'s "Corrupted preset" fallback, which catches
+        # PresetValidationError only, making one bad preset exit ``specify
+        # preset list`` with a raw traceback and hide the healthy ones).
+        # Mirrors the sibling IntegrationDescriptor, which already type-checks
+        # the same four fields.
         for field in ["id", "name", "version", "description"]:
             if field not in pack:
                 raise PresetValidationError(f"Missing preset.{field}")
+            if not isinstance(pack[field], str):
+                raise PresetValidationError(
+                    f"Invalid preset.{field}: expected a string, "
+                    f"got {type(pack[field]).__name__}"
+                )
 
         # Validate pack ID format
         if not re.match(r'^[a-z0-9-]+$', pack["id"]):
@@ -367,6 +383,19 @@ def _validate(self):
                     "Template missing 'type', 'name', or 'file'"
                 )
 
+            # 'name' feeds re.match and 'file' feeds os.path.normpath below;
+            # both raise a bare TypeError on a non-string, which is not a
+            # PresetValidationError and so escapes the callers that handle a
+            # malformed manifest. The sibling extension manifest already
+            # rejects a non-string command 'file' via
+            # relative_extension_path_violation().
+            for field in ("type", "name", "file"):
+                if not isinstance(tmpl[field], str):
+                    raise PresetValidationError(
+                        f"Invalid template {field}: expected a string, "
+                        f"got {type(tmpl[field]).__name__}"
+                    )
+
             if tmpl["type"] not in VALID_PRESET_TEMPLATE_TYPES:
                 raise PresetValidationError(
                     f"Invalid template type '{tmpl['type']}': "
diff --git a/tests/test_extensions.py b/tests/test_extensions.py
index 63df3133fe..22da438281 100644
--- a/tests/test_extensions.py
+++ b/tests/test_extensions.py
@@ -671,6 +671,102 @@ def test_required_section_not_mapping_rejected(
         with pytest.raises(ValidationError, match=f"Invalid {section}"):
             ExtensionManifest(manifest_path)
 
+    @pytest.mark.parametrize("field", ["id", "name", "version", "description"])
+    @pytest.mark.parametrize("bad", [1.0, 5, None, ["a"], {"a": 1}, True])
+    def test_extension_metadata_field_not_string_rejected(
+        self, temp_dir, valid_manifest_data, field, bad
+    ):
+        """A non-string extension.<field> must raise ValidationError, not a raw
+        TypeError.
+
+        The loop over these four fields only checked key PRESENCE, then fed the
+        values to ``re.match`` (id) and ``packaging.Version`` (version), both of
+        which raise a bare TypeError on a non-string. YAML makes that an easy
+        authoring slip: unquoted ``version: 1.0`` parses as a float and ``id: 2``
+        as an int. TypeError is not a ValidationError, so it escaped
+        list_installed()'s "Corrupted extension" fallback and made
+        `specify extension list` exit 1 with a raw traceback, hiding every
+        healthy extension too. The sibling IntegrationDescriptor already
+        type-checks the same four fields.
+        """
+        import yaml
+
+        valid_manifest_data["extension"][field] = bad
+
+        manifest_path = temp_dir / "extension.yml"
+        with open(manifest_path, 'w') as f:
+            yaml.dump(valid_manifest_data, f)
+
+        with pytest.raises(ValidationError, match=f"Invalid extension.{field}"):
+            ExtensionManifest(manifest_path)
+
+    @pytest.mark.parametrize("bad", [1.0, 5, None, ["a"], {"a": 1}, True])
+    def test_command_name_not_string_rejected(
+        self, temp_dir, valid_manifest_data, bad
+    ):
+        """A non-string command name must raise ValidationError, not a raw
+        TypeError from the name-pattern match.
+
+        The sibling ``file`` field was already covered, since
+        relative_extension_path_violation() rejects a non-string value; ``name``
+        went straight into EXTENSION_COMMAND_NAME_PATTERN.match().
+        """
+        import yaml
+
+        valid_manifest_data["provides"]["commands"][0]["name"] = bad
+
+        manifest_path = temp_dir / "extension.yml"
+        with open(manifest_path, 'w') as f:
+            yaml.dump(valid_manifest_data, f)
+
+        with pytest.raises(ValidationError, match="Invalid command name"):
+            ExtensionManifest(manifest_path)
+
+    def test_one_bad_manifest_does_not_hide_healthy_extensions(self, temp_dir):
+        """End-to-end guard for the symptom: an unquoted ``version: 1.0`` in one
+        installed extension must degrade to "Corrupted extension" and still let
+        list_installed() report the healthy ones, instead of raising TypeError
+        out of the whole call.
+        """
+        ext_root = temp_dir / ".specify" / "extensions"
+        for ext_id, version in (("good-ext", '"1.0.0"'), ("bad-ext", "1.0")):
+            ext_path = ext_root / ext_id
+            ext_path.mkdir(parents=True, exist_ok=True)
+            (ext_path / "extension.yml").write_text(
+                f"""schema_version: "1.0"
+extension:
+  id: {ext_id}
+  name: {ext_id}
+  version: {version}
+  description: desc
+requires:
+  speckit_version: ">=0.1.0"
+provides:
+  commands:
+    - name: speckit.{ext_id}.hello
+      file: commands/hello.md
+""",
+                encoding="utf-8",
+            )
+        (ext_root / ".registry").write_text(
+            json.dumps(
+                {
+                    "schema_version": "1.0",
+                    "extensions": {
+                        "good-ext": {"version": "1.0.0", "enabled": True},
+                        "bad-ext": {"version": "1.0", "enabled": True},
+                    },
+                }
+            ),
+            encoding="utf-8",
+        )
+
+        listed = {row["id"]: row for row in ExtensionManager(temp_dir).list_installed()}
+
+        assert set(listed) == {"good-ext", "bad-ext"}
+        assert "Corrupted" not in listed["good-ext"]["description"]
+        assert "Corrupted" in listed["bad-ext"]["description"]
+
     def test_empty_provides_mapping_is_still_accepted_with_hooks(
         self, temp_dir, valid_manifest_data
     ):
diff --git a/tests/test_presets.py b/tests/test_presets.py
index d4c964c838..798d7aaf60 100644
--- a/tests/test_presets.py
+++ b/tests/test_presets.py
@@ -217,6 +217,102 @@ def test_required_section_not_mapping_raises_validation_error(
         ):
             PresetManifest(manifest_path)
 
+    @pytest.mark.parametrize("field", ["id", "name", "version", "description"])
+    @pytest.mark.parametrize("bad", [1.0, 5, None, ["a"], {"a": 1}, True])
+    def test_preset_metadata_field_not_string_raises_validation_error(
+        self, temp_dir, valid_pack_data, field, bad
+    ):
+        """A non-string preset.<field> raises PresetValidationError, not a raw
+        TypeError.
+
+        The loop over these four fields only checked key PRESENCE, then fed the
+        values to ``re.match`` (id) and ``packaging.Version`` (version), both of
+        which raise a bare TypeError on a non-string. YAML makes that an easy
+        authoring slip: unquoted ``version: 1.0`` parses as a float and ``id: 2``
+        as an int. TypeError is not a PresetValidationError, so it escaped
+        list_installed()'s "Corrupted preset" fallback and made
+        `specify preset list` exit 1 with a raw traceback, hiding every healthy
+        preset too. The sibling IntegrationDescriptor already type-checks the
+        same four fields.
+        """
+        valid_pack_data["preset"][field] = bad
+        manifest_path = temp_dir / "preset.yml"
+        manifest_path.write_text(yaml.safe_dump(valid_pack_data), encoding="utf-8")
+
+        with pytest.raises(
+            PresetValidationError,
+            match=rf"Invalid preset\.{field}: expected a string",
+        ):
+            PresetManifest(manifest_path)
+
+    @pytest.mark.parametrize("field", ["name", "file"])
+    @pytest.mark.parametrize("bad", [1.0, 5, None, ["a"], {"a": 1}, True])
+    def test_template_entry_field_not_string_raises_validation_error(
+        self, temp_dir, valid_pack_data, field, bad
+    ):
+        """A non-string template ``name``/``file`` raises PresetValidationError.
+
+        ``name`` reaches ``re.match`` and ``file`` reaches ``os.path.normpath``;
+        both raise a bare TypeError on a non-string. The sibling extension
+        manifest already rejects a non-string command ``file`` via
+        relative_extension_path_violation().
+        """
+        valid_pack_data["provides"]["templates"][0][field] = bad
+        manifest_path = temp_dir / "preset.yml"
+        manifest_path.write_text(yaml.safe_dump(valid_pack_data), encoding="utf-8")
+
+        with pytest.raises(
+            PresetValidationError,
+            match=rf"Invalid template {field}: expected a string",
+        ):
+            PresetManifest(manifest_path)
+
+    def test_one_bad_manifest_does_not_hide_healthy_presets(self, temp_dir):
+        """End-to-end guard for the symptom: an unquoted ``version: 1.0`` in one
+        installed preset must degrade to "Corrupted preset" and still let
+        list_installed() report the healthy ones, instead of raising TypeError
+        out of the whole call.
+        """
+        preset_root = temp_dir / ".specify" / "presets"
+        for pack_id, version in (("good-pack", '"1.0.0"'), ("bad-pack", "1.0")):
+            pack_path = preset_root / pack_id
+            pack_path.mkdir(parents=True, exist_ok=True)
+            (pack_path / "preset.yml").write_text(
+                f"""schema_version: "1.0"
+preset:
+  id: {pack_id}
+  name: {pack_id}
+  version: {version}
+  description: desc
+requires:
+  speckit_version: ">=0.1.0"
+provides:
+  templates:
+    - type: template
+      name: spec
+      file: templates/spec.md
+""",
+                encoding="utf-8",
+            )
+        (preset_root / ".registry").write_text(
+            json.dumps(
+                {
+                    "schema_version": "1.0",
+                    "presets": {
+                        "good-pack": {"version": "1.0.0", "enabled": True},
+                        "bad-pack": {"version": "1.0", "enabled": True},
+                    },
+                }
+            ),
+            encoding="utf-8",
+        )
+
+        listed = {row["id"]: row for row in PresetManager(temp_dir).list_installed()}
+
+        assert set(listed) == {"good-pack", "bad-pack"}
+        assert "Corrupted" not in listed["good-pack"]["description"]
+        assert "Corrupted" in listed["bad-pack"]["description"]
+
     @pytest.mark.parametrize(
         "bad",
         [