diff --git a/executor_extra_test.go b/executor_extra_test.go
index 091a823..5713cdd 100644
--- a/executor_extra_test.go
+++ b/executor_extra_test.go
@@ -253,6 +253,27 @@ func TestExecutorExtra_ModuleAddHost_Good_AddsHostAndGroups(t *testing.T) {
 	assert.Equal(t, []string{"db1"}, GetHosts(e.inventory, "production"))
 }
 
+func TestExecutorExtra_ModuleAddHost_Good_IdempotentRepeat(t *testing.T) {
+	e := NewExecutor("/tmp")
+
+	_, err := e.moduleAddHost(map[string]any{
+		"name":   "cache1",
+		"groups": []any{"caches"},
+		"role":   "redis",
+	})
+	require.NoError(t, err)
+
+	result, err := e.moduleAddHost(map[string]any{
+		"name":   "cache1",
+		"groups": []any{"caches"},
+		"role":   "redis",
+	})
+	require.NoError(t, err)
+
+	assert.False(t, result.Changed)
+	assert.Equal(t, []string{"cache1"}, GetHosts(e.inventory, "caches"))
+}
+
 func TestExecutorExtra_ModuleAddHost_Good_ThroughDispatcher(t *testing.T) {
 	e := NewExecutor("/tmp")
 	task := &Task{
diff --git a/modules.go b/modules.go
index 74e7770..11726f7 100644
--- a/modules.go
+++ b/modules.go
@@ -12,6 +12,7 @@ import (
 	"os"
 	"path"
 	"path/filepath"
+	"reflect"
 	"regexp"
 	"sort"
 	"strconv"
@@ -1685,14 +1686,19 @@ func (e *Executor) moduleAddHost(args map[string]any) (*TaskResult, error) {
 	}
 
 	host := findInventoryHost(e.inventory.All, name)
+	changed := false
 	if host == nil {
 		host = &Host{}
+		changed = true
 	}
 	if host.Vars == nil {
 		host.Vars = make(map[string]any)
 	}
 
 	if v := getStringArg(args, "ansible_host", ""); v != "" {
+		if host.AnsibleHost != v {
+			changed = true
+		}
 		host.AnsibleHost = v
 	}
 	switch v := args["ansible_port"].(type) {
@@ -1718,22 +1724,40 @@ func (e *Executor) moduleAddHost(args map[string]any) (*TaskResult, error) {
 		host.AnsiblePort = int(v)
 	case string:
 		if port, err := strconv.Atoi(v); err == nil {
+			if host.AnsiblePort != port {
+				changed = true
+			}
 			host.AnsiblePort = port
 		}
 	}
 	if v := getStringArg(args, "ansible_user", ""); v != "" {
+		if host.AnsibleUser != v {
+			changed = true
+		}
 		host.AnsibleUser = v
 	}
 	if v := getStringArg(args, "ansible_password", ""); v != "" {
+		if host.AnsiblePassword != v {
+			changed = true
+		}
 		host.AnsiblePassword = v
 	}
 	if v := getStringArg(args, "ansible_ssh_private_key_file", ""); v != "" {
+		if host.AnsibleSSHPrivateKeyFile != v {
+			changed = true
+		}
 		host.AnsibleSSHPrivateKeyFile = v
 	}
 	if v := getStringArg(args, "ansible_connection", ""); v != "" {
+		if host.AnsibleConnection != v {
+			changed = true
+		}
 		host.AnsibleConnection = v
 	}
 	if v := getStringArg(args, "ansible_become_password", ""); v != "" {
+		if host.AnsibleBecomePassword != v {
+			changed = true
+		}
 		host.AnsibleBecomePassword = v
 	}
 
@@ -1747,12 +1771,18 @@ func (e *Executor) moduleAddHost(args map[string]any) (*TaskResult, error) {
 		if reserved[key] {
 			continue
 		}
+		if existing, ok := host.Vars[key]; !ok || !reflect.DeepEqual(existing, val) {
+			changed = true
+		}
 		host.Vars[key] = val
 	}
 
 	if e.inventory.All.Hosts == nil {
 		e.inventory.All.Hosts = make(map[string]*Host)
 	}
+	if existing, ok := e.inventory.All.Hosts[name]; !ok || existing != host {
+		changed = true
+	}
 	e.inventory.All.Hosts[name] = host
 
 	for _, groupName := range groups {
@@ -1764,6 +1794,9 @@ func (e *Executor) moduleAddHost(args map[string]any) (*TaskResult, error) {
 		if group.Hosts == nil {
 			group.Hosts = make(map[string]*Host)
 		}
+		if existing, ok := group.Hosts[name]; !ok || existing != host {
+			changed = true
+		}
 		group.Hosts[name] = host
 	}
 
@@ -1777,7 +1810,7 @@ func (e *Executor) moduleAddHost(args map[string]any) (*TaskResult, error) {
 		data["groups"] = groups
 	}
 
-	return &TaskResult{Changed: true, Msg: msg, Data: data}, nil
+	return &TaskResult{Changed: changed, Msg: msg, Data: data}, nil
 }
 
 func (e *Executor) moduleGroupBy(host string, args map[string]any) (*TaskResult, error) {