diff --git a/README.md b/README.md
index fb8eacb..801febe 100644
--- a/README.md
+++ b/README.md
@@ -68,6 +68,32 @@ See [Installation](#installation) for source-install / upgrade / multi-install s
 
 ---
 
+## Live source-control diff (`--auto-mirror`)
+
+When `--auto-mirror` is added to the server args, every successful modifying tool call (`set_pou_code`, `create_pou`, `rename_object`, `add_library`, ...) is followed by an automatic `mirror_export`. The textual `<projectDir>/mcp-mirror/` tree is refreshed on disk in lock-step with the binary `.project`, so an external editor watching the folder sees the change immediately. The first refresh on a given project also fires `code --add <mirrorDir>` once, which appends the mirror folder to your active VSCode window so the diff shows up in the Source Control panel.
+
+Enable it by adding the flag to the relevant entry's `args` in `.mcp.json`:
+
+```jsonc
+"args": [
+  "--codesys-path", "...",
+  "--codesys-profile", "...",
+  "--mode", "persistent",
+  "--auto-mirror"
+]
+```
+
+Recommended one-time setup so the Source Control panel has a baseline to diff against:
+
+```bash
+cd <projectDir>/mcp-mirror
+git init && git add -A && git commit -m "baseline"
+```
+
+After that, watch VSCode's Source Control panel as Claude edits — every tool call shows up as a real diff. The VSCode hook is best-effort: if the `code` CLI shim isn't on the standard path, the mirror still refreshes silently and the response carries an `(auto-mirror: refreshed)` hint instead of opening a window.
+
+---
+
 ## What's new in this fork
 
 ### Compatibility fixes (the headline)
diff --git a/src/server.ts b/src/server.ts
index 629c47a..c6c9472 100644
--- a/src/server.ts
+++ b/src/server.ts
@@ -839,7 +839,7 @@ export async function startMcpServer(config: ServerConfig): Promise<void> {
         'open_project', { PROJECT_FILE_PATH: escaped }, ['ensure_project_open']
       );
       const result = await executor.executeScript(script);
-      return formatToolResponse(result, `Project opened: ${args.filePath}`);
+      return await formatModifyingResponse(result, `Project opened: ${args.filePath}`, escaped, mirrorCtx);
     }
   );
 
@@ -886,7 +886,7 @@ export async function startMcpServer(config: ServerConfig): Promise<void> {
         TEMPLATE_PROJECT_PATH: templatePath,
       });
       const result = await executor.executeScript(script);
-      return formatToolResponse(result, `Project created from template: ${absPath}`);
+      return await formatModifyingResponse(result, `Project created from template: ${absPath}`, absPath, mirrorCtx);
     }
   );
 
@@ -902,7 +902,7 @@ export async function startMcpServer(config: ServerConfig): Promise<void> {
         'save_project', { PROJECT_FILE_PATH: escaped }, ['ensure_project_open']
       );
       const result = await executor.executeScript(script);
-      return formatToolResponse(result, `Project saved: ${args.projectFilePath}`);
+      return await formatModifyingResponse(result, `Project saved: ${args.projectFilePath}`, escaped, mirrorCtx);
     }
   );
 
@@ -933,9 +933,11 @@ export async function startMcpServer(config: ServerConfig): Promise<void> {
         ['ensure_project_open', 'find_object_by_path']
       );
       const result = await executor.executeScript(script);
-      return formatToolResponse(
+      return await formatModifyingResponse(
         result,
-        `POU '${args.name}' created in '${sanParentPath}' of ${args.projectFilePath}. Project saved.`
+        `POU '${args.name}' created in '${sanParentPath}' of ${args.projectFilePath}. Project saved.`,
+        escProjPath,
+        mirrorCtx
       );
     }
   );
@@ -992,9 +994,11 @@ export async function startMcpServer(config: ServerConfig): Promise<void> {
         ['ensure_project_open', 'find_object_by_path']
       );
       const result = await executor.executeScript(script);
-      return formatToolResponse(
+      return await formatModifyingResponse(
         result,
-        `Code set for '${sanPouPath}' in ${args.projectFilePath}. Project saved.`
+        `Code set for '${sanPouPath}' in ${args.projectFilePath}. Project saved.`,
+        escProjPath,
+        mirrorCtx
       );
     }
   );
@@ -1022,9 +1026,11 @@ export async function startMcpServer(config: ServerConfig): Promise<void> {
         ['ensure_project_open', 'find_object_by_path']
       );
       const result = await executor.executeScript(script);
-      return formatToolResponse(
+      return await formatModifyingResponse(
         result,
-        `Property '${args.propertyName}' created under '${sanParentPath}' in ${args.projectFilePath}. Project saved.`
+        `Property '${args.propertyName}' created under '${sanParentPath}' in ${args.projectFilePath}. Project saved.`,
+        escProjPath,
+        mirrorCtx
       );
     }
   );
@@ -1052,9 +1058,11 @@ export async function startMcpServer(config: ServerConfig): Promise<void> {
         ['ensure_project_open', 'find_object_by_path']
       );
       const result = await executor.executeScript(script);
-      return formatToolResponse(
+      return await formatModifyingResponse(
         result,
-        `Method '${args.methodName}' created under '${sanParentPath}' in ${args.projectFilePath}. Project saved.`
+        `Method '${args.methodName}' created under '${sanParentPath}' in ${args.projectFilePath}. Project saved.`,
+        escProjPath,
+        mirrorCtx
       );
     }
   );
@@ -1219,9 +1227,11 @@ export async function startMcpServer(config: ServerConfig): Promise<void> {
         ['ensure_project_open', 'find_object_by_path']
       );
       const result = await executor.executeScript(script);
-      return formatToolResponse(
+      return await formatModifyingResponse(
         result,
-        `DUT '${args.name}' (${args.dutType}) created in '${sanParentPath}' of ${args.projectFilePath}. Project saved.`
+        `DUT '${args.name}' (${args.dutType}) created in '${sanParentPath}' of ${args.projectFilePath}. Project saved.`,
+        escProjPath,
+        mirrorCtx
       );
     }
   );
@@ -1262,9 +1272,11 @@ export async function startMcpServer(config: ServerConfig): Promise<void> {
         ['ensure_project_open', 'find_object_by_path']
       );
       const result = await executor.executeScript(script);
-      return formatToolResponse(
+      return await formatModifyingResponse(
         result,
-        `GVL '${args.name}' created in '${sanParentPath}' of ${args.projectFilePath}. Project saved.`
+        `GVL '${args.name}' created in '${sanParentPath}' of ${args.projectFilePath}. Project saved.`,
+        escProjPath,
+        mirrorCtx
       );
     }
   );
@@ -1290,9 +1302,11 @@ export async function startMcpServer(config: ServerConfig): Promise<void> {
         ['ensure_project_open', 'find_object_by_path']
       );
       const result = await executor.executeScript(script);
-      return formatToolResponse(
+      return await formatModifyingResponse(
         result,
-        `Folder '${args.folderName}' created in '${sanParentPath}' of ${args.projectFilePath}. Project saved.`
+        `Folder '${args.folderName}' created in '${sanParentPath}' of ${args.projectFilePath}. Project saved.`,
+        escProjPath,
+        mirrorCtx
       );
     }
   );
@@ -1316,9 +1330,11 @@ export async function startMcpServer(config: ServerConfig): Promise<void> {
         ['ensure_project_open', 'find_object_by_path']
       );
       const result = await executor.executeScript(script);
-      return formatToolResponse(
+      return await formatModifyingResponse(
         result,
-        `Object '${sanObjPath}' deleted from ${args.projectFilePath}. Project saved.`
+        `Object '${sanObjPath}' deleted from ${args.projectFilePath}. Project saved.`,
+        escProjPath,
+        mirrorCtx
       );
     }
   );
@@ -1344,9 +1360,11 @@ export async function startMcpServer(config: ServerConfig): Promise<void> {
         ['ensure_project_open', 'find_object_by_path']
       );
       const result = await executor.executeScript(script);
-      return formatToolResponse(
+      return await formatModifyingResponse(
         result,
-        `Object '${sanObjPath}' renamed to '${args.newName}' in ${args.projectFilePath}. Project saved.`
+        `Object '${sanObjPath}' renamed to '${args.newName}' in ${args.projectFilePath}. Project saved.`,
+        escProjPath,
+        mirrorCtx
       );
     }
   );
@@ -1792,9 +1810,11 @@ export async function startMcpServer(config: ServerConfig): Promise<void> {
         ['ensure_project_open']
       );
       const result = await executor.executeScript(script);
-      return formatToolResponse(
+      return await formatModifyingResponse(
         result,
-        `Library '${args.libraryName}' added to ${args.projectFilePath}. Project saved.`
+        `Library '${args.libraryName}' added to ${args.projectFilePath}. Project saved.`,
+        escaped,
+        mirrorCtx
       );
     }
   );