diff --git a/tools/src/test/proto/buf_breaking-remote.yaml b/tools/src/test/proto/buf_breaking-remote.yaml
index ef404300..e3fecdfd 100644
--- a/tools/src/test/proto/buf_breaking-remote.yaml
+++ b/tools/src/test/proto/buf_breaking-remote.yaml
@@ -1,14 +1,6 @@
 # This is the config for "Buf" - a ProtocolBuffer linter/checker/more
 # see https://buf.build/docs/configuration/v2/buf-yaml
 version: v2
-lint:  # https://buf.build/docs/configuration/v2/buf-yaml#lint
-  except:
-    - FIELD_NOT_REQUIRED
-    - PACKAGE_NO_IMPORT_CYCLE
-  disallow_comment_ignores: true
 breaking:  # https://buf.build/docs/configuration/v2/buf-yaml#breaking
   use:  # see https://buf.build/docs/breaking/overview#rules-and-categories
-    - WIRE
-  except:
-    - EXTENSION_NO_DELETE
-    - FIELD_SAME_DEFAULT
+    - WIRE
\ No newline at end of file
diff --git a/tools/src/test/proto/buf_breaking-version.yaml b/tools/src/test/proto/buf_breaking-version.yaml
index 79ee4962..222a4ed4 100644
--- a/tools/src/test/proto/buf_breaking-version.yaml
+++ b/tools/src/test/proto/buf_breaking-version.yaml
@@ -1,15 +1,9 @@
 # This is the config for "Buf" - a ProtocolBuffer linter/checker/more
 # see https://buf.build/docs/configuration/v2/buf-yaml
 version: v2
-lint:  # https://buf.build/docs/configuration/v2/buf-yaml#lint
-  except:
-    - FIELD_NOT_REQUIRED
-    - PACKAGE_NO_IMPORT_CYCLE
-  disallow_comment_ignores: true
 breaking:  # https://buf.build/docs/configuration/v2/buf-yaml#breaking
   use:  # see https://buf.build/docs/breaking/overview#rules-and-categories
     - WIRE
   except:
-    - EXTENSION_NO_DELETE
-    - FIELD_SAME_DEFAULT
-    - FILE_SAME_PACKAGE
+    # scope is to detect changes from one version to the other -> so ignore "FILE_SAME_PACKAGE"
+    - FILE_SAME_PACKAGE
\ No newline at end of file
diff --git a/tools/src/test/proto/buf_lint.yaml b/tools/src/test/proto/buf_lint.yaml
index b16877fa..109f5eaa 100644
--- a/tools/src/test/proto/buf_lint.yaml
+++ b/tools/src/test/proto/buf_lint.yaml
@@ -2,22 +2,25 @@
 # see https://buf.build/docs/configuration/v2/buf-yaml
 version: v2
 lint:  # https://buf.build/docs/configuration/v2/buf-yaml#lint
-  use:  # see https://buf.build/docs/breaking/overview#rules-and-categories
-    - DEFAULT
+  use:  # see https://buf.build/docs/lint/rules
+    - STANDARD  # https://buf.build/docs/lint/rules/#standard
+    # - COMMENTS  # https://buf.build/docs/lint/rules/#comments
   except:
-    - DIRECTORY_SAME_PACKAGE
-    - FIELD_LOWER_SNAKE_CASE
-    - FIELD_NOT_REQUIRED
-    - FILE_LOWER_SNAKE_CASE
-    - PACKAGE_DIRECTORY_MATCH
-    - PACKAGE_NO_IMPORT_CYCLE
-    - PACKAGE_VERSION_SUFFIX
+    # directory/file layout does not match the recommendation/framework of the tool
+    - DIRECTORY_SAME_PACKAGE   # https://buf.build/docs/lint/rules#directory_same_package
+    - PACKAGE_DIRECTORY_MATCH  # https://buf.build/docs/lint/rules#package_lower_snake_case
+    - FILE_LOWER_SNAKE_CASE    # https://buf.build/docs/lint/rules#file_lower_snake_case
+    # we do not stick to the following best-practices and recommendations:
+    # (shall be fixed with v2.0 of this very schema)
+    - PACKAGE_VERSION_SUFFIX   # https://buf.build/docs/lint/rules#package_version_suffix
+    - FIELD_LOWER_SNAKE_CASE   # https://buf.build/docs/lint/rules#field_lower_snake_case
   ignore_only:
-    DEFAULT:
-      - schema/bom-1.3.proto
-      - schema/bom-1.4.proto
-      - schema/bom-1.5.proto
-breaking:  # https://buf.build/docs/configuration/v2/buf-yaml#breaking
-  except:
-    - EXTENSION_NO_DELETE
-    - FIELD_SAME_DEFAULT
+    # legacy schema files may NOT stick to the rules -- this is acknowledged.
+    STANDARD:
+      - "schema/bom-1.5.proto"
+      - "schema/bom-1.4.proto"
+      - "schema/bom-1.3.proto"
+    COMMENTS:
+      - "schema/bom-1.5.proto"
+      - "schema/bom-1.4.proto"
+      - "schema/bom-1.3.proto"
diff --git a/tools/src/test/proto/mig/buf.yaml b/tools/src/test/proto/mig/buf.yaml
deleted file mode 100644
index 3a499919..00000000
--- a/tools/src/test/proto/mig/buf.yaml
+++ /dev/null
@@ -1,21 +0,0 @@
-version: v2
-lint:
-  use:
-    - DEFAULT
-  except:
-    - DIRECTORY_SAME_PACKAGE
-    - FIELD_LOWER_SNAKE_CASE
-    - FIELD_NOT_REQUIRED
-    - FILE_LOWER_SNAKE_CASE
-    - PACKAGE_DIRECTORY_MATCH
-    - PACKAGE_NO_IMPORT_CYCLE
-    - PACKAGE_VERSION_SUFFIX
-  ignore_only:
-    DEFAULT:
-      - schema/bom-1.3.proto
-      - schema/bom-1.4.proto
-      - schema/bom-1.5.proto
-breaking:
-  except:
-    - EXTENSION_NO_DELETE
-    - FIELD_SAME_DEFAULT
diff --git a/tools/src/test/proto/test.sh b/tools/src/test/proto/test.sh
index 4a43531d..a0c1c384 100755
--- a/tools/src/test/proto/test.sh
+++ b/tools/src/test/proto/test.sh
@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-set -ue
+set -uex
 
 THIS_PATH="$(realpath "$(dirname "$0")")"
 ROOT_PATH="$(realpath "${THIS_PATH}/../../../..")"
@@ -32,7 +32,6 @@ function schema-lint () {
     --workdir '/workspace' \
     bufbuild/buf:"$BUF_IMAGE_VERSION" \
       lint --path "$SCHEMA_DIR" \
-      --config 'buf.yaml' \
       --error-format "$LOG_FORMAT"
 
   echo '>> OK.' >&2
@@ -57,14 +56,13 @@ function schema-breaking-version () {
     echo ">> compare new:${NEW} -VS- old:${OLD}" >&2
     # stick with the original path of "$NEW", so the reporting makes sense...
     docker run --rm \
-      --volume "${ROOT_PATH}/${SCHEMA_DIR}/${NEW}:/workspace/${SCHEMA_DIR}/${NEW}:ro" \
-      --volume "${ROOT_PATH}/${SCHEMA_DIR}/${OLD}:/workspace/${SCHEMA_DIR_OLD}/${NEW}:ro" \
-      --volume "${THIS_PATH}/buf_breaking-version.yaml:/workspace/buf.yaml:ro" \
-      --workdir '/workspace' \
+      --volume "${ROOT_PATH}/${SCHEMA_DIR}/${OLD}:/workspaces/old/${NEW}:ro" \
+      --volume "${ROOT_PATH}/${SCHEMA_DIR}/${NEW}:/workspaces/new/${NEW}:ro" \
+      --volume "${THIS_PATH}/buf_breaking-version.yaml:/workspaces/new/buf.yaml:ro" \
+      --workdir '/workspaces' \
       bufbuild/buf:"$BUF_IMAGE_VERSION" \
-        breaking "$SCHEMA_DIR" \
-        --against "$SCHEMA_DIR_OLD" \
-        --config 'buf.yaml' \
+        breaking new \
+        --against old \
         --error-format "$LOG_FORMAT"
   }
 
@@ -90,9 +88,8 @@ function schema-breaking-remote () {
     --volume "${THIS_PATH}/buf_breaking-remote.yaml:/workspace/buf.yaml:ro" \
     --workdir '/workspace' \
     bufbuild/buf:"$BUF_IMAGE_VERSION" \
-      breaking "$SCHEMA_DIR" \
-      --against "${REMOTE}#subdir=${SCHEMA_DIR}" \
-      --config 'buf.yaml' \
+      breaking --path "$SCHEMA_DIR" \
+      --against "${REMOTE}" \
       --error-format "$LOG_FORMAT"
 
   echo '>> OK.' >&2