diff --git a/.agents/scripts/agent-test-helper.sh b/.agents/scripts/agent-test-helper.sh
index 542c00a8..8f41f5a8 100755
--- a/.agents/scripts/agent-test-helper.sh
+++ b/.agents/scripts/agent-test-helper.sh
@@ -47,12 +47,12 @@
 set -euo pipefail
 
 # Configuration
+# Source shared constants (provides sed_inplace, print_*, color constants)
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)" || exit
 source "${SCRIPT_DIR}/shared-constants.sh"
 
 # shellcheck disable=SC2034
 readonly SCRIPT_DIR
-source "$SCRIPT_DIR/shared-constants.sh" 2>/dev/null || true
 readonly AIDEVOPS_DIR="${HOME}/.aidevops"
 readonly WORKSPACE_DIR="${AIDEVOPS_DIR}/.agent-workspace"
 readonly TEST_DIR="${WORKSPACE_DIR}/agent-tests"
diff --git a/.agents/scripts/auto-version-bump.sh b/.agents/scripts/auto-version-bump.sh
index 4a3ab048..33398451 100755
--- a/.agents/scripts/auto-version-bump.sh
+++ b/.agents/scripts/auto-version-bump.sh
@@ -7,13 +7,10 @@
 # Author: AI DevOps Framework
 # Version: 1.1.1
 
+# Source shared constants (provides sed_inplace, print_*, color constants)
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)" || exit
 source "${SCRIPT_DIR}/shared-constants.sh"
 
-# Source shared constants (provides sed_inplace and other utilities)
-SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)" || exit
-source "$SCRIPT_DIR/shared-constants.sh" 2>/dev/null || true
-
 # Repository root directory
 REPO_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)" || exit
 VERSION_MANAGER="$REPO_ROOT/.agents/scripts/version-manager.sh"
diff --git a/.agents/scripts/shared-constants.sh b/.agents/scripts/shared-constants.sh
index f7a448f0..7368b3fe 100755
--- a/.agents/scripts/shared-constants.sh
+++ b/.agents/scripts/shared-constants.sh
@@ -10,6 +10,10 @@
 # Author: AI DevOps Framework
 # Version: 1.6.0
 
+# Include guard: prevent readonly errors when sourced multiple times
+[[ -n "${_SHARED_CONSTANTS_LOADED:-}" ]] && return 0
+_SHARED_CONSTANTS_LOADED=1
+
 # =============================================================================
 # HTTP and API Constants
 # =============================================================================
diff --git a/.agents/scripts/supervisor-helper.sh b/.agents/scripts/supervisor-helper.sh
index 7eebd085..67f87912 100755
--- a/.agents/scripts/supervisor-helper.sh
+++ b/.agents/scripts/supervisor-helper.sh
@@ -81,7 +81,6 @@ SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)" || exit
 source "${SCRIPT_DIR}/shared-constants.sh"
 
 readonly SCRIPT_DIR
-source "$SCRIPT_DIR/shared-constants.sh" 2>/dev/null || true
 readonly SUPERVISOR_DIR="${AIDEVOPS_SUPERVISOR_DIR:-$HOME/.aidevops/.agent-workspace/supervisor}"
 readonly SUPERVISOR_DB="$SUPERVISOR_DIR/supervisor.db"
 readonly MAIL_HELPER="${SCRIPT_DIR}/mail-helper.sh"       # Used by pulse command (t128.2)
diff --git a/.agents/scripts/unstract-helper.sh b/.agents/scripts/unstract-helper.sh
index 079d6b15..26316798 100755
--- a/.agents/scripts/unstract-helper.sh
+++ b/.agents/scripts/unstract-helper.sh
@@ -6,15 +6,12 @@
 #
 # Usage: unstract-helper.sh [install|start|stop|status|logs|uninstall|configure-llm]
 
+# Source shared constants (provides sed_inplace, print_*, color constants)
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)" || exit
 source "${SCRIPT_DIR}/shared-constants.sh"
 
 set -euo pipefail
 
-# Source shared constants (provides sed_inplace and other utilities)
-SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)" || exit
-source "$SCRIPT_DIR/shared-constants.sh" 2>/dev/null || true
-
 # Constants
 readonly UNSTRACT_DIR="${HOME}/.aidevops/unstract"
 readonly UNSTRACT_REPO="https://github.com/Zipstack/unstract.git"
diff --git a/.agents/scripts/version-manager.sh b/.agents/scripts/version-manager.sh
index 7124795d..1029e579 100755
--- a/.agents/scripts/version-manager.sh
+++ b/.agents/scripts/version-manager.sh
@@ -7,13 +7,10 @@
 # Author: AI DevOps Framework
 # Version: 1.1.0
 
+# Source shared constants (provides sed_inplace, print_*, color constants)
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)" || exit
 source "${SCRIPT_DIR}/shared-constants.sh"
 
-# Source shared constants (provides sed_inplace and other utilities)
-SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)" || exit
-source "$SCRIPT_DIR/shared-constants.sh" 2>/dev/null || true
-
 # Repository root directory
 # First try git (works when called from any location within a repo)
 # Fall back to script-relative path (for when script is sourced or tested standalone)