diff --git a/CHANGELOG.md b/CHANGELOG.md
index a4036ef..9c96a24 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -37,6 +37,8 @@ and versions are tracked in the repo-root `VERSION` file.
   grace period.
 - Changed list and string array helpers to require caller-declared indexed arrays
   instead of silently coercing scalar variables.
+- Changed repository validation to run a warning-level ShellCheck profile for
+  production libraries, examples, validation scripts, and shared test helpers.
 
 ## [1.0.0] - 2026-06-21
 
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index ba853f6..8186899 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -44,6 +44,8 @@ boundary.
 Useful commands:
 
 ```bash
+./tests/validate.sh
+tests/lint-warnings.sh
 basectl check base-bash-libs
 basectl doctor base-bash-libs
 basectl test base-bash-libs
diff --git a/bin/base-bash b/bin/base-bash
index d978dbc..49e3b8b 100755
--- a/bin/base-bash
+++ b/bin/base-bash
@@ -72,6 +72,8 @@ base_bash_ensure_supported_bash() {
     for candidate in "${candidates[@]}"; do
         [[ -x "$candidate" ]] || continue
         [[ "$candidate" == "${BASH:-}" ]] && continue
+        # Re-exec under a supported Bash; the current process should not continue.
+        # shellcheck disable=SC2093
         exec "$candidate" "$0" "$@"
     done
 
@@ -123,6 +125,8 @@ base_bash_source_stdlib() {
     local stdlib_path="$BASE_BASH_LIBS_DIR/std/lib_std.sh"
     shift
 
+    # Consumed by lib_std.sh while it is being sourced below.
+    # shellcheck disable=SC2034
     BASE_BASH_BOOTSTRAP_SOURCE="$script_path"
     # shellcheck source=/dev/null
     source "$stdlib_path" "$@" || exit $?
diff --git a/examples/cookbook-args-lists-strings.sh b/examples/cookbook-args-lists-strings.sh
index 8b5d8db..6f6fc8d 100755
--- a/examples/cookbook-args-lists-strings.sh
+++ b/examples/cookbook-args-lists-strings.sh
@@ -11,6 +11,8 @@ import "$repo_root/lib/bash/str/lib_str.sh"
 
 declare -A options=()
 declare -a positionals=()
+# Passed by name to arg_parse.
+# shellcheck disable=SC2034
 declare -a specs=(
     "verbose|flag|--verbose|-v"
     "tag|value|--tag|-t"
@@ -22,7 +24,11 @@ tag="${options[tag]-default}"
 str_trim tag
 str_lower tag
 
+# Mutated by name through list helpers.
+# shellcheck disable=SC2034
 declare -a values=()
+# Mutated by name through list helpers.
+# shellcheck disable=SC2034
 declare -a unique_values=()
 summary=""
 count=""
diff --git a/lib/bash/std/lib_std.sh b/lib/bash/std/lib_std.sh
index 67d3d1c..18f6b9a 100644
--- a/lib/bash/std/lib_std.sh
+++ b/lib/bash/std/lib_std.sh
@@ -326,6 +326,7 @@ import() {
            import_path="$__SCRIPT_DIR__/$lib"
         fi
         if [[ -f "$import_path" ]]; then
+            # shellcheck disable=SC1090
             source "$import_path"
             exit_if_error $? "Import of library '$lib' not successful."
         else
@@ -1987,6 +1988,8 @@ wait_for_enter() {
 # The only function that would be called upon sourcing of the library
 #
 __stdlib_init__
+# Used by companion libraries as a source-order guard.
+# shellcheck disable=SC2034
 readonly BASE_BASH_LIBS_STDLIB_LOADED=1
 
 # This is the crucial step: it resets the positional parameters ($@, $1, etc.)
diff --git a/lib/bash/tests/test_helper.sh b/lib/bash/tests/test_helper.sh
index a161505..49af9f4 100644
--- a/lib/bash/tests/test_helper.sh
+++ b/lib/bash/tests/test_helper.sh
@@ -6,11 +6,18 @@ if declare -f run >/dev/null 2>&1; then
     eval "$(declare -f run | sed '1 s/^run /bats_run /')"
 fi
 
-readonly BASE_BASH_TESTS_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd -P)"
-readonly BASE_BASH_DIR="$(cd "$BASE_BASH_TESTS_DIR/.." && pwd -P)"
-readonly BASE_REPO_ROOT="$(cd "$BASE_BASH_DIR/../.." && pwd -P)"
-readonly BASE_CLI_BASH_DIR="$BASE_REPO_ROOT/cli/bash"
-readonly BASE_TEST_ORIG_PATH="$PATH"
+BASE_BASH_TESTS_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd -P)"
+readonly BASE_BASH_TESTS_DIR
+BASE_BASH_DIR="$(cd "$BASE_BASH_TESTS_DIR/.." && pwd -P)"
+readonly BASE_BASH_DIR
+BASE_REPO_ROOT="$(cd "$BASE_BASH_DIR/../.." && pwd -P)"
+# Used by BATS suites loaded after this helper.
+# shellcheck disable=SC2034
+readonly BASE_REPO_ROOT
+# Used by BATS suites loaded after this helper.
+BASE_TEST_ORIG_PATH="$PATH"
+# shellcheck disable=SC2034
+readonly BASE_TEST_ORIG_PATH
 
 unset_base_runtime_env() {
     local var_name
@@ -57,10 +64,14 @@ capture_command() {
 
     set +e
     "$@" >"$capture_file" 2>&1
+    # BATS-compatible globals consumed by individual test cases after capture_command returns.
+    # shellcheck disable=SC2034
     status=$?
     set -e
 
+    # shellcheck disable=SC2034
     output="$(cat "$capture_file")"
+    # shellcheck disable=SC2034
     IFS=$'\n' read -r -d '' -a lines < "$capture_file" || true
 }
 
diff --git a/tests/lint-warnings.sh b/tests/lint-warnings.sh
new file mode 100755
index 0000000..1002434
--- /dev/null
+++ b/tests/lint-warnings.sh
@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+
+set -e
+
+repo_root="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd -P)" || exit 1
+cd "$repo_root" || exit 1
+
+lint_files=(
+  bin/base-bash
+  tests/validate.sh
+  tests/lint-warnings.sh
+  examples/std-usage.sh
+  examples/cookbook-cleanup-temp.sh
+  examples/cookbook-args-lists-strings.sh
+  lib/bash/std/lib_std.sh
+  lib/bash/file/lib_file.sh
+  lib/bash/git/lib_git.sh
+  lib/bash/str/lib_str.sh
+  lib/bash/arg/lib_arg.sh
+  lib/bash/list/lib_list.sh
+  lib/bash/tests/test_helper.sh
+  tests/launcher.bats
+)
+
+shellcheck --severity=warning "${lint_files[@]}"
diff --git a/tests/validate.sh b/tests/validate.sh
index b9972f9..4c4c640 100755
--- a/tests/validate.sh
+++ b/tests/validate.sh
@@ -38,6 +38,7 @@ required_files=(
   lib/bash/list/tests/lib_list.bats
   lib/bash/tests/test_helper.sh
   tests/launcher.bats
+  tests/lint-warnings.sh
 )
 
 cd "$repo_root" || exit 1
@@ -94,6 +95,7 @@ done
 shellcheck --severity=error \
   bin/base-bash \
   tests/validate.sh \
+  tests/lint-warnings.sh \
   examples/std-usage.sh \
   examples/cookbook-cleanup-temp.sh \
   examples/cookbook-args-lists-strings.sh \