diff --git a/k8s/instance/list b/k8s/instance/list
index a11a8d07..4d327699 100644
--- a/k8s/instance/list
+++ b/k8s/instance/list
@@ -36,4 +36,4 @@ echo "$PODS" | jq --argjson limit ${LIMIT:-10} '{
    launch_time: .metadata.creationTimestamp,
    spot: (.spec.nodeName // "" | test("spot"; "i"))
  })
-}'
\ No newline at end of file
+}'
diff --git a/k8s/instance/tests/build_context.bats b/k8s/instance/tests/build_context.bats
new file mode 100644
index 00000000..3148f3f8
--- /dev/null
+++ b/k8s/instance/tests/build_context.bats
@@ -0,0 +1,107 @@
+#!/usr/bin/env bats
+# =============================================================================
+# Unit tests for instance/build_context - instance parameter extraction
+# =============================================================================
+
+setup() {
+  export PROJECT_ROOT="$(cd "$BATS_TEST_DIRNAME/../../.." && pwd)"
+  source "$PROJECT_ROOT/testing/assertions.sh"
+
+  export SCRIPT="$BATS_TEST_DIRNAME/../build_context"
+
+  export CONTEXT='{
+    "arguments": {
+      "application_id": "app-123",
+      "scope_id": "scope-456",
+      "deployment_id": "deploy-789"
+    }
+  }'
+
+  export LIMIT=10
+}
+
+teardown() {
+  unset CONTEXT LIMIT APPLICATION_ID SCOPE_ID DEPLOYMENT_ID
+}
+
+# =============================================================================
+# Success flow
+# =============================================================================
+@test "instance/build_context: exports all parameters correctly" {
+  source "$SCRIPT"
+
+  assert_equal "$APPLICATION_ID" "app-123"
+  assert_equal "$SCOPE_ID" "scope-456"
+  assert_equal "$DEPLOYMENT_ID" "deploy-789"
+  assert_equal "$LIMIT" "10"
+}
+
+@test "instance/build_context: produces no stdout output" {
+  run bash -c 'source "$SCRIPT"'
+
+  assert_equal "$status" "0"
+  assert_equal "$output" ""
+}
+
+# =============================================================================
+# Array argument handling
+# =============================================================================
+@test "instance/build_context: handles array arguments (takes first element)" {
+  export CONTEXT='{
+    "arguments": {
+      "application_id": ["app-first", "app-second"],
+      "scope_id": ["scope-first", "scope-second"],
+      "deployment_id": ["deploy-first", "deploy-second"]
+    }
+  }'
+
+  source "$SCRIPT"
+
+  assert_equal "$APPLICATION_ID" "app-first"
+  assert_equal "$SCOPE_ID" "scope-first"
+  assert_equal "$DEPLOYMENT_ID" "deploy-first"
+}
+
+# =============================================================================
+# Missing / null arguments
+# =============================================================================
+@test "instance/build_context: handles missing arguments" {
+  export CONTEXT='{
+    "arguments": {}
+  }'
+
+  source "$SCRIPT"
+
+  assert_equal "$APPLICATION_ID" "null"
+  assert_equal "$SCOPE_ID" "null"
+  assert_equal "$DEPLOYMENT_ID" "null"
+}
+
+@test "instance/build_context: handles null arguments object" {
+  export CONTEXT='{}'
+
+  source "$SCRIPT"
+
+  assert_empty "$APPLICATION_ID"
+  assert_empty "$SCOPE_ID"
+  assert_empty "$DEPLOYMENT_ID"
+}
+
+# =============================================================================
+# LIMIT handling
+# =============================================================================
+@test "instance/build_context: uses default LIMIT of 10 when not set" {
+  unset LIMIT
+
+  source "$SCRIPT"
+
+  assert_equal "$LIMIT" "10"
+}
+
+@test "instance/build_context: preserves custom LIMIT" {
+  export LIMIT=50
+
+  source "$SCRIPT"
+
+  assert_equal "$LIMIT" "50"
+}
diff --git a/k8s/instance/tests/list.bats b/k8s/instance/tests/list.bats
new file mode 100644
index 00000000..7c7831e4
--- /dev/null
+++ b/k8s/instance/tests/list.bats
@@ -0,0 +1,377 @@
+#!/usr/bin/env bats
+# =============================================================================
+# Unit tests for instance/list - list instances/pods with details
+# =============================================================================
+
+setup() {
+  export PROJECT_ROOT="$(cd "$BATS_TEST_DIRNAME/../../.." && pwd)"
+  source "$PROJECT_ROOT/testing/assertions.sh"
+
+  export SCRIPT="$BATS_TEST_DIRNAME/../list"
+
+  export NAMESPACE_OVERRIDE=""
+  export APPLICATION_ID="app-123"
+  export SCOPE_ID="scope-456"
+  export DEPLOYMENT_ID="deploy-789"
+  export LIMIT=10
+
+  # Default kubectl mock — two pods with different characteristics
+  kubectl() {
+    echo '{
+      "items": [
+        {
+          "metadata": {
+            "name": "app-pod-1",
+            "namespace": "nullplatform",
+            "labels": {
+              "nullplatform": "true",
+              "application_id": "app-123",
+              "scope_id": "scope-456"
+            },
+            "creationTimestamp": "2024-01-01T10:00:00Z"
+          },
+          "spec": {
+            "nodeName": "node-1",
+            "containers": [{
+              "name": "main",
+              "resources": {
+                "requests": {"cpu": "100m", "memory": "128Mi"},
+                "limits": {"cpu": "500m", "memory": "512Mi"}
+              }
+            }]
+          },
+          "status": {
+            "phase": "Running",
+            "podIP": "10.0.0.5",
+            "containerStatuses": [{
+              "name": "main",
+              "ready": true,
+              "image": "myapp:latest"
+            }]
+          }
+        },
+        {
+          "metadata": {
+            "name": "app-pod-2",
+            "namespace": "nullplatform",
+            "labels": {
+              "nullplatform": "true",
+              "application_id": "app-123",
+              "scope_id": "scope-456"
+            },
+            "creationTimestamp": "2024-01-01T11:00:00Z"
+          },
+          "spec": {
+            "nodeName": "spot-node-1",
+            "containers": [{
+              "name": "main",
+              "resources": {
+                "requests": {"cpu": "200m", "memory": "256Mi"},
+                "limits": {"cpu": "1000m", "memory": "1Gi"}
+              }
+            }]
+          },
+          "status": {
+            "phase": "Running",
+            "podIP": "10.0.0.6",
+            "containerStatuses": [{
+              "name": "main",
+              "ready": true,
+              "image": "myapp:arm64"
+            }]
+          }
+        }
+      ]
+    }'
+  }
+  export -f kubectl
+}
+
+teardown() {
+  unset NAMESPACE_OVERRIDE APPLICATION_ID SCOPE_ID DEPLOYMENT_ID LIMIT
+  unset -f kubectl
+}
+
+# =============================================================================
+# Full JSON structure validation
+# =============================================================================
+@test "instance/list: produces complete JSON with all expected fields" {
+  run bash "$SCRIPT"
+
+  assert_equal "$status" "0"
+
+  local expected_json='{
+    "results": [
+      {
+        "id": "app-pod-1",
+        "selector": {
+          "nullplatform": "true",
+          "application_id": "app-123",
+          "scope_id": "scope-456"
+        },
+        "details": {
+          "namespace": "nullplatform",
+          "ip": "10.0.0.5",
+          "dns": "10.0.0.5.nullplatform.pod.cluster.local",
+          "cpu": {
+            "requested": 0.1,
+            "limit": 0.5
+          },
+          "memory": {
+            "requested": "128Mi",
+            "limit": "512Mi"
+          },
+          "architecture": "x86"
+        },
+        "state": "Running",
+        "launch_time": "2024-01-01T10:00:00Z",
+        "spot": false
+      },
+      {
+        "id": "app-pod-2",
+        "selector": {
+          "nullplatform": "true",
+          "application_id": "app-123",
+          "scope_id": "scope-456"
+        },
+        "details": {
+          "namespace": "nullplatform",
+          "ip": "10.0.0.6",
+          "dns": "10.0.0.6.nullplatform.pod.cluster.local",
+          "cpu": {
+            "requested": 0.2,
+            "limit": 1
+          },
+          "memory": {
+            "requested": "256Mi",
+            "limit": "1Gi"
+          },
+          "architecture": "arm64"
+        },
+        "state": "Running",
+        "launch_time": "2024-01-01T11:00:00Z",
+        "spot": true
+      }
+    ]
+  }'
+
+  assert_json_equal "$output" "$expected_json" "Complete instance list output"
+}
+
+# =============================================================================
+# LIMIT handling
+# =============================================================================
+@test "instance/list: respects LIMIT parameter" {
+  export LIMIT=1
+
+  run bash "$SCRIPT"
+
+  assert_equal "$status" "0"
+  local count=$(echo "$output" | jq '.results | length')
+  assert_equal "$count" "1"
+
+  local id=$(echo "$output" | jq -r '.results[0].id')
+  assert_equal "$id" "app-pod-1"
+}
+
+# =============================================================================
+# Label selector construction
+# =============================================================================
+@test "instance/list: builds label selector with all filters" {
+  kubectl() {
+    if [[ "$*" == *"-l nullplatform=true,application_id=app-123,scope_id=scope-456,deployment_id=deploy-789"* ]]; then
+      echo '{"items":[]}'
+    else
+      echo "Unexpected label selector: $*" >&2
+      return 1
+    fi
+  }
+  export -f kubectl
+
+  run bash "$SCRIPT"
+
+  assert_equal "$status" "0"
+}
+
+@test "instance/list: builds label selector with only APPLICATION_ID" {
+  export SCOPE_ID=""
+  export DEPLOYMENT_ID=""
+
+  kubectl() {
+    if [[ "$*" == *"-l nullplatform=true,application_id=app-123"* ]]; then
+      echo '{"items":[]}'
+    else
+      echo "Unexpected label selector: $*" >&2
+      return 1
+    fi
+  }
+  export -f kubectl
+
+  run bash "$SCRIPT"
+
+  assert_equal "$status" "0"
+}
+
+@test "instance/list: excludes null filter values from label selector" {
+  export APPLICATION_ID="null"
+  export SCOPE_ID="null"
+  export DEPLOYMENT_ID="null"
+
+  kubectl() {
+    if [[ "$*" == *"-l nullplatform=true"* ]] && [[ "$*" != *"application_id"* ]]; then
+      echo '{"items":[]}'
+    else
+      echo "Unexpected label selector: $*" >&2
+      return 1
+    fi
+  }
+  export -f kubectl
+
+  run bash "$SCRIPT"
+
+  assert_equal "$status" "0"
+}
+
+# =============================================================================
+# Namespace handling
+# =============================================================================
+@test "instance/list: uses default nullplatform namespace" {
+  kubectl() {
+    if [[ "$*" == *"-n nullplatform"* ]]; then
+      echo '{"items":[]}'
+    else
+      echo "Expected default namespace: $*" >&2
+      return 1
+    fi
+  }
+  export -f kubectl
+
+  run bash "$SCRIPT"
+
+  assert_equal "$status" "0"
+}
+
+@test "instance/list: uses NAMESPACE_OVERRIDE when set" {
+  export NAMESPACE_OVERRIDE="custom-namespace"
+
+  kubectl() {
+    if [[ "$*" == *"-n custom-namespace"* ]]; then
+      echo '{"items":[]}'
+    else
+      echo "Expected namespace override: $*" >&2
+      return 1
+    fi
+  }
+  export -f kubectl
+
+  run bash "$SCRIPT"
+
+  assert_equal "$status" "0"
+}
+
+# =============================================================================
+# Edge cases
+# =============================================================================
+@test "instance/list: handles empty pod list" {
+  kubectl() {
+    echo '{"items":[]}'
+  }
+  export -f kubectl
+
+  run bash "$SCRIPT"
+
+  assert_equal "$status" "0"
+  assert_json_equal "$output" '{"results": []}' "Empty pod list"
+}
+
+@test "instance/list: handles pending pod without IP" {
+  kubectl() {
+    echo '{
+      "items": [{
+        "metadata": {
+          "name": "pending-pod",
+          "namespace": "nullplatform",
+          "labels": {"nullplatform": "true"},
+          "creationTimestamp": "2024-01-01T10:00:00Z"
+        },
+        "spec": {
+          "containers": [{
+            "name": "main",
+            "resources": {}
+          }]
+        },
+        "status": {
+          "phase": "Pending",
+          "containerStatuses": [{
+            "name": "main",
+            "image": "myapp:latest"
+          }]
+        }
+      }]
+    }'
+  }
+  export -f kubectl
+
+  run bash "$SCRIPT"
+
+  assert_equal "$status" "0"
+
+  local expected_json='{
+    "results": [{
+      "id": "pending-pod",
+      "selector": {"nullplatform": "true"},
+      "details": {
+        "namespace": "nullplatform",
+        "ip": "pending",
+        "dns": "pending",
+        "cpu": {"requested": 0, "limit": 0},
+        "memory": {"requested": "0Mi", "limit": "0Mi"},
+        "architecture": "x86"
+      },
+      "state": "Pending",
+      "launch_time": "2024-01-01T10:00:00Z",
+      "spot": false
+    }]
+  }'
+
+  assert_json_equal "$output" "$expected_json" "Pending pod output"
+}
+
+@test "instance/list: handles pod without nodeName (spot defaults to false)" {
+  kubectl() {
+    echo '{
+      "items": [{
+        "metadata": {
+          "name": "no-node-pod",
+          "namespace": "nullplatform",
+          "labels": {},
+          "creationTimestamp": "2024-01-01T10:00:00Z"
+        },
+        "spec": {
+          "containers": [{
+            "name": "main",
+            "resources": {
+              "requests": {"cpu": "500m", "memory": "256Mi"},
+              "limits": {"cpu": "1000m", "memory": "512Mi"}
+            }
+          }]
+        },
+        "status": {
+          "phase": "Pending",
+          "podIP": "10.0.0.7",
+          "containerStatuses": [{
+            "name": "main",
+            "image": "myapp:latest"
+          }]
+        }
+      }]
+    }'
+  }
+  export -f kubectl
+
+  run bash "$SCRIPT"
+
+  assert_equal "$status" "0"
+  local spot=$(echo "$output" | jq -r '.results[0].spot')
+  assert_equal "$spot" "false"
+}