diff --git a/README.md b/README.md
index cc2db74..7bae4c4 100644
--- a/README.md
+++ b/README.md
@@ -44,7 +44,7 @@ Accepted user-facing surfaces:
 
 - Training API validation failures are deterministic public validation errors: `400` with `invalid_json_body`, `400` with `missing_required_json_field:<field>`, `400` with `invalid_json_field:<field>`, `400` with `invalid_path_param:<field>`, or `400` with `invalid_limit_query_param:limit`.
 - Missing Training cases return `404` with `not_found`.
-- Unexpected Training API failures return `500` with `internal_server_error`; the public response masks raw internals, and responses do not echo raw internals.
+- Masked unexpected Training API failures return `500` with `internal_server_error`; the public response masks raw internals, and responses do not echo raw internals.
 - Package CLI public errors for invalid input paths and invalid output targets emit one-line JSON with `passed`, `input`, `output`, and `error`; stable public error codes include `input_file_not_found`, `input_path_is_directory`, `output_path_is_directory`, and `output_path_unwritable`.
 
 Public API response examples:
@@ -85,7 +85,7 @@ Public API response examples:
 {"error": "not_found"}
 ```
 
-- Unexpected Training route failure: any Training route -> HTTP `500`
+- Masked internal server error: any Training route -> HTTP `500`
 
 ```json
 {"error": "internal_server_error"}
diff --git a/docs/training_case_engine_m1_m6_product_readme.md b/docs/training_case_engine_m1_m6_product_readme.md
index 8720a58..9fe0bfc 100644
--- a/docs/training_case_engine_m1_m6_product_readme.md
+++ b/docs/training_case_engine_m1_m6_product_readme.md
@@ -121,7 +121,7 @@ Training public error catalog:
 - Invalid path identifiers are deterministic public validation errors and return `400` with `invalid_path_param:<field>`.
 - Invalid list limits are deterministic public validation errors and return `400` with `invalid_limit_query_param:limit`; valid limits are `1` through `100`.
 - Missing cases return `404` with `not_found`.
-- Unexpected failures return `500` with `internal_server_error`; the public response masks raw internals, and responses do not echo raw internals.
+- Masked unexpected failures return `500` with `internal_server_error`; the public response masks raw internals, and responses do not echo raw internals.
 - Package CLI public errors for invalid input paths and invalid output targets emit one-line JSON with `passed`, `input`, `output`, and `error`; stable public error codes include `input_file_not_found`, `input_path_is_directory`, `output_path_is_directory`, and `output_path_unwritable`.
 
 Public API response examples:
@@ -162,7 +162,7 @@ Public API response examples:
 {"error": "not_found"}
 ```
 
-- Unexpected Training route failure: any Training route -> HTTP `500`
+- Masked internal server error: any Training route -> HTTP `500`
 
 ```json
 {"error": "internal_server_error"}
diff --git a/tests/unit/test_documentation_consistency.py b/tests/unit/test_documentation_consistency.py
index 5ea31aa..46eb8aa 100644
--- a/tests/unit/test_documentation_consistency.py
+++ b/tests/unit/test_documentation_consistency.py
@@ -325,7 +325,7 @@ TRAINING_PUBLIC_ERROR_API_EXAMPLES = (
         {"error": "not_found"},
     ),
     (
-        "Unexpected Training route failure",
+        "Masked internal server error",
         "any Training route -> HTTP `500`",
         {"error": "internal_server_error"},
     ),
@@ -4756,6 +4756,36 @@ TRAINING_M41_RELEASE_INDEX_REQUIRED_SNIPPET_INVENTORY = (
                 for forbidden in TRAINING_PUBLIC_ERROR_FORBIDDEN_RAW_WORDING:
                     self.assertNotIn(forbidden.lower(), text)
 
+    def test_training_public_error_sections_avoid_sensitive_and_local_internals(self) -> None:
+        forbidden_terms = (
+            "data" + "base",
+            "data" + "base_url",
+            "post" + "gresql",
+            "psy" + "copg",
+            "pass" + "word",
+            "pass" + "wd",
+            "tok" + "en",
+            "sec" + "ret",
+            "api" + "_key",
+            "trace" + "back",
+            "stack trace",
+            "runtime" + "error",
+        )
+        local_path_roots = tuple(
+            "/" + root + "/"
+            for root in ("tmp", "root", "home", "Users", "var", "etc")
+        )
+
+        for path in TRAINING_PUBLIC_ERROR_DOCS:
+            section = _training_public_error_section(path)
+            lower_section = section.lower()
+            with self.subTest(path=path.name):
+                for forbidden in forbidden_terms:
+                    self.assertNotIn(forbidden.lower(), lower_section)
+                for local_path_root in local_path_roots:
+                    self.assertNotIn(local_path_root.lower(), lower_section)
+                self.assertNotRegex(section, r"(?<![\w`])(?:[A-Za-z]:\\|~[/\\])")
+
     def test_training_case_product_doc_avoids_private_literal_shapes(self) -> None:
         text = TRAINING_PRODUCT_DOC.read_text(encoding="utf-8").lower()