diff --git a/bin/build b/bin/build
index f4a4b9d..e3c69e7 100755
--- a/bin/build
+++ b/bin/build
@@ -4,13 +4,25 @@ set -euo pipefail
 root="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
 
 if [ -f "$root/services/core/go.mod" ]; then
-  (cd "$root/services/core" && go build ./...)
+  if command -v go >/dev/null 2>&1; then
+    (cd "$root/services/core" && go build ./...)
+  else
+    echo "skip services/core: go not found"
+  fi
 fi
 
 if [ -f "$root/apps/web/package.json" ]; then
-  (cd "$root/apps/web" && npm run build)
+  if command -v npm >/dev/null 2>&1; then
+    (cd "$root/apps/web" && npm run build)
+  else
+    echo "skip apps/web: npm not found"
+  fi
 fi
 
 if [ -f "$root/apps/mobile/pubspec.yaml" ]; then
-  (cd "$root/apps/mobile" && flutter build web)
+  if command -v flutter >/dev/null 2>&1; then
+    (cd "$root/apps/mobile" && flutter build web)
+  else
+    echo "skip apps/mobile: flutter not found"
+  fi
 fi
diff --git a/bin/lint b/bin/lint
index eb73706..33f6fe3 100755
--- a/bin/lint
+++ b/bin/lint
@@ -4,13 +4,25 @@ set -euo pipefail
 root="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
 
 if [ -f "$root/services/core/go.mod" ]; then
-  (cd "$root/services/core" && go vet ./...)
+  if command -v go >/dev/null 2>&1; then
+    (cd "$root/services/core" && go vet ./...)
+  else
+    echo "skip services/core: go not found"
+  fi
 fi
 
 if [ -f "$root/apps/web/package.json" ]; then
-  (cd "$root/apps/web" && npm run lint --if-present)
+  if command -v npm >/dev/null 2>&1; then
+    (cd "$root/apps/web" && npm run lint --if-present)
+  else
+    echo "skip apps/web: npm not found"
+  fi
 fi
 
 if [ -f "$root/apps/mobile/pubspec.yaml" ]; then
-  (cd "$root/apps/mobile" && flutter analyze)
+  if command -v flutter >/dev/null 2>&1; then
+    (cd "$root/apps/mobile" && flutter analyze)
+  else
+    echo "skip apps/mobile: flutter not found"
+  fi
 fi
diff --git a/bin/test b/bin/test
index c99797a..34bce27 100755
--- a/bin/test
+++ b/bin/test
@@ -4,13 +4,32 @@ set -euo pipefail
 root="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
 
 if [ -f "$root/services/core/go.mod" ]; then
-  (cd "$root/services/core" && go test ./...)
+  if command -v go >/dev/null 2>&1; then
+    (cd "$root/services/core" && go test ./...)
+  else
+    echo "skip services/core: go not found"
+  fi
 fi
 
 if [ -f "$root/apps/web/package.json" ]; then
-  (cd "$root/apps/web" && npm test -- --run)
+  if command -v npm >/dev/null 2>&1; then
+    (
+      cd "$root/apps/web"
+      if node -e "process.exit(require('./package.json').scripts?.test ? 0 : 1)" >/dev/null 2>&1; then
+        npm test -- --run
+      else
+        npm run check --if-present
+      fi
+    )
+  else
+    echo "skip apps/web: npm not found"
+  fi
 fi
 
 if [ -f "$root/apps/mobile/pubspec.yaml" ]; then
-  (cd "$root/apps/mobile" && flutter test)
+  if command -v flutter >/dev/null 2>&1; then
+    (cd "$root/apps/mobile" && flutter test)
+  else
+    echo "skip apps/mobile: flutter not found"
+  fi
 fi