diff --git a/.agents/KNOWLEDGE_MAP.md b/.agents/KNOWLEDGE_MAP.md
index 6febfee..fbe5e20 100644
--- a/.agents/KNOWLEDGE_MAP.md
+++ b/.agents/KNOWLEDGE_MAP.md
@@ -10,7 +10,8 @@ Welcome, AI Developer. Do not load all documentation files into your context. Us
 
 ## 2. Features & Interfaces
 *   **CLI Commands & Routing** ➔ `docs/reference/cli-commands.md`
-*   **Context Management System** ➔ `docs/ADR-001-Context-System.md`
+*   **Context Management System** ➔ `docs/architecture/adrs/ADR-001-Context-System.md`
+*   **CAD Modeling & Examples** ➔ `docs/reference/cad-examples.md`
 
 ## 3. Operations & Safety
 *   **Firmware Audit Log & Vulnerabilities** ➔ `docs/reference/firmware-audit-log.md`
diff --git a/.gitignore b/.gitignore
index 70da60c..6013332 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,4 +3,6 @@ Plan.md
 coverage/
 tmp/
 dist/
-bundle/
\ No newline at end of file
+bundle/
+__pycache__/
+.DS_Store__pycache__/
diff --git a/assets/python/freecad_listener.py b/assets/python/freecad_listener.py
new file mode 100644
index 0000000..39b79ab
--- /dev/null
+++ b/assets/python/freecad_listener.py
@@ -0,0 +1,158 @@
+import sys
+import json
+import socket
+import threading
+import traceback
+import FreeCAD
+import FreeCADGui
+
+# Import PySide2 for thread-safe GUI execution
+from PySide2 import QtCore
+
+class ScriptExecutor(QtCore.QObject):
+    execute_signal = QtCore.Signal(object)
+    
+    def __init__(self):
+        super().__init__()
+        self.execute_signal.connect(self._run_script, QtCore.Qt.QueuedConnection)
+        
+    def _run_script(self, func):
+        func()
+        
+    def run_in_gui(self, func):
+        self.execute_signal.emit(func)
+
+# This executor must be instantiated in the main thread (during module import)
+executor = ScriptExecutor()
+
+# This script is meant to be injected into FreeCAD via `FreeCAD.exe freecad_listener.py`
+# It sets up a local TCP server that listens for JSON commands from FlyCLI.
+
+HOST = '127.0.0.1'
+PORT = 9099
+for arg in sys.argv[1:]:
+    try:
+        PORT = int(arg)
+        break
+    except ValueError:
+        pass
+
+def handle_client(conn):
+    buffer = ""
+    while True:
+        try:
+            data = conn.recv(4096)
+            if not data:
+                break
+            buffer += data.decode('utf-8')
+            
+            while '\n' in buffer:
+                line, buffer = buffer.split('\n', 1)
+                line = line.strip()
+                if not line:
+                    continue
+                
+                try:
+                    request = json.loads(line)
+                    process_request(request, conn)
+                except json.JSONDecodeError:
+                    send_response(conn, {"status": "ERROR", "error": {"message": "Invalid JSON"}})
+        except Exception as e:
+            FreeCAD.Console.PrintError(f"IPC Error: {e}\n")
+            break
+    conn.close()
+
+def process_request(request, conn):
+    req_id = request.get('id', 'unknown')
+    action = request.get('action')
+    
+    if action == 'EXECUTE_SCRIPT':
+        code = request.get('payload', {}).get('code', '')
+        
+        import queue
+        res_queue = queue.Queue()
+
+        def execute_in_gui():
+            try:
+                env = {"FreeCAD": FreeCAD, "FreeCADGui": FreeCADGui, "App": FreeCAD, "Gui": FreeCADGui}
+                exec(code, env)
+                if FreeCAD.ActiveDocument:
+                    FreeCAD.ActiveDocument.recompute()
+                res_queue.put({"status": "SUCCESS", "data": {}})
+            except Exception as e:
+                err_msg = traceback.format_exc()
+                res_queue.put({"status": "ERROR", "error": {"type": type(e).__name__, "message": str(e), "traceback": err_msg}})
+        
+        executor.run_in_gui(execute_in_gui)
+        
+        try:
+            res = res_queue.get(timeout=15)
+            if res["status"] == "SUCCESS":
+                send_response(conn, {"id": req_id, "status": "SUCCESS", "data": res["data"]})
+            else:
+                send_response(conn, {"id": req_id, "status": "ERROR", "error": res["error"]})
+        except queue.Empty:
+            send_response(conn, {"id": req_id, "status": "ERROR", "error": {"message": "Execution timed out in GUI thread"}})
+
+    elif action == 'GET_STATE':
+        import queue
+        res_queue = queue.Queue()
+
+        def get_state_in_gui():
+            try:
+                doc = FreeCAD.ActiveDocument
+                if not doc:
+                    res_queue.put({"status": "SUCCESS", "data": {"objects": []}})
+                    return
+                
+                objs = []
+                for obj in doc.Objects:
+                    props = {}
+                    for prop in obj.PropertiesList:
+                        try:
+                            props[prop] = str(getattr(obj, prop))
+                        except:
+                            pass
+                    objs.append({"name": obj.Name, "type": obj.TypeId, "properties": props})
+                res_queue.put({"status": "SUCCESS", "data": {"objects": objs}})
+            except Exception as e:
+                err_msg = traceback.format_exc()
+                res_queue.put({"status": "ERROR", "error": {"type": type(e).__name__, "message": str(e), "traceback": err_msg}})
+
+        executor.run_in_gui(get_state_in_gui)
+
+        try:
+            res = res_queue.get(timeout=5)
+            if res["status"] == "SUCCESS":
+                send_response(conn, {"id": req_id, "status": "SUCCESS", "data": res["data"]})
+            else:
+                send_response(conn, {"id": req_id, "status": "ERROR", "error": res["error"]})
+        except queue.Empty:
+            send_response(conn, {"id": req_id, "status": "ERROR", "error": {"message": "Get state timed out in GUI thread"}})
+    else:
+        send_response(conn, {"id": req_id, "status": "ERROR", "error": {"message": f"Unknown action: {action}"}})
+
+def send_response(conn, response):
+    try:
+        msg = json.dumps(response) + "\n"
+        conn.sendall(msg.encode('utf-8'))
+    except Exception as e:
+        FreeCAD.Console.PrintError(f"Failed to send response: {e}\n")
+
+def start_server():
+    server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+    server.bind((HOST, PORT))
+    server.listen(1)
+    FreeCAD.Console.PrintMessage(f"FlyCLI IPC Listener started on {HOST}:{PORT}\n")
+    
+    while True:
+        conn, addr = server.accept()
+        FreeCAD.Console.PrintMessage(f"Connected to FlyCLI: {addr}\n")
+        client_thread = threading.Thread(target=handle_client, args=(conn,))
+        client_thread.daemon = True
+        client_thread.start()
+
+# Start the server in a background thread so we don't block the FreeCAD GUI
+server_thread = threading.Thread(target=start_server)
+server_thread.daemon = True
+server_thread.start()
diff --git a/docs/architecture/ai_cad_views/ddd_interfaces.md b/docs/architecture/ai_cad_views/ddd_interfaces.md
new file mode 100644
index 0000000..a6ec12e
--- /dev/null
+++ b/docs/architecture/ai_cad_views/ddd_interfaces.md
@@ -0,0 +1,158 @@
+# Domain-Driven Design (DDD) & Interface Contracts
+
+This document defines the Ubiquitous Language for the interactive CAD modeling domain and describes the interaction contracts between components (including IPC).
+
+## 📖 Domain Dictionary (Ubiquitous Language)
+
+| Term | Description |
+| :--- | :--- |
+| **CadAgent** | The orchestrator inside FlyCLI that manages the interaction loop (User ↔ Gemini ↔ CadEngine). |
+| **EnvironmentManager** | The component responsible for verifying, downloading, and extracting the portable FreeCAD environment. Ensures zero-friction startup. |
+| **CadEngineProcess** | The running `FreeCAD.exe` process, spawned and managed by FlyCLI (via Node.js `child_process`). |
+| **IpcBridge** | The two-way communication channel (TCP socket) between FlyCLI (Node.js) and the CadEngineProcess (Python listener). |
+| **GeometryScript** | The Python/CadQuery code generated by the LLM to build or modify the 3D model. |
+| **EngineState** | The current state of the open FreeCAD document (list of objects, basic parameters) returned via IpcBridge to inform the LLM about manual user changes. |
+
+---
+
+## 🧩 Interfaces (JavaScript Contracts)
+
+Since the project uses pure JavaScript (ES Modules), these interfaces are described as abstract JSDoc contracts. They will serve as blueprints for the actual implementation.
+
+### 1. Interface: `IEnvironmentManager`
+Manages the lifecycle of the portable FreeCAD environment.
+
+```javascript
+/**
+ * @interface IEnvironmentManager
+ */
+const IEnvironmentManager = {
+  /**
+   * Checks for the environment, downloads it if necessary.
+   * @returns {Promise<string>} Absolute path to the FreeCAD.exe executable.
+   */
+  ensureEnvironmentReady: async () => {},
+
+  /**
+   * Returns current status (e.g., download progress for CLI display).
+   * @returns {Object} { status: 'downloading'|'ready', progress: 45 }
+   */
+  getStatus: () => {}
+};
+```
+
+### 2. Interface: `ICadEngineProcess`
+Manages the FreeCAD process and IPC communication.
+
+```javascript
+/**
+ * @interface ICadEngineProcess
+ */
+const ICadEngineProcess = {
+  /**
+   * Starts the FreeCAD process and connects to the IpcBridge.
+   * @param {string} executablePath 
+   * @returns {Promise<void>}
+   */
+  start: async (executablePath) => {},
+
+  /**
+   * Stops the FreeCAD process.
+   */
+  stop: async () => {},
+
+  /**
+   * Sends a GeometryScript to FreeCAD for execution.
+   * @param {string} scriptContent Python/CadQuery code
+   * @returns {Promise<Object>} Execution result (success or error details)
+   */
+  executeScript: async (scriptContent) => {},
+
+  /**
+   * Reads the object tree from the FreeCAD document.
+   * @returns {Promise<Object>} Serialized EngineState
+   */
+  getDocumentState: async () => {}
+};
+
+### 3. Interface: `IMcpServer`
+Manages the Model Context Protocol (MCP) server over stdio.
+
+```javascript
+/**
+ * @interface IMcpServer
+ */
+const IMcpServer = {
+  /**
+   * Starts listening for MCP requests on stdio.
+   * @returns {Promise<void>}
+   */
+  start: async () => {},
+
+  /**
+   * Stops the MCP server.
+   */
+  stop: () => {}
+};
+```
+```
+
+---
+
+## 📡 IPC Payload Contracts (JSON)
+
+Data is transmitted over a TCP connection between Node.js (Client) and the Python Listener (Server) inside FreeCAD. All messages are JSON formatted, separated by a newline (`\n`).
+
+### 1. Execute Script Request (Node -> Python)
+```json
+{
+  "id": "req_12345",
+  "action": "EXECUTE_SCRIPT",
+  "payload": {
+    "code": "import cadquery as cq\nbox = cq.Workplane('XY').box(10,10,10)\nshow_object(box)"
+  }
+}
+```
+
+### 2. Execution Response (Python -> Node)
+```json
+{
+  "id": "req_12345",
+  "status": "SUCCESS",
+  "data": {
+    "executionTimeMs": 142
+  }
+}
+```
+*On Error (e.g., LLM generated bad syntax):*
+```json
+{
+  "id": "req_12345",
+  "status": "ERROR",
+  "error": {
+    "type": "SyntaxError",
+    "message": "unexpected indent (line 3)"
+  }
+}
+```
+
+### 3. Get State Request (Node -> Python)
+```json
+{
+  "id": "req_12346",
+  "action": "GET_STATE"
+}
+```
+
+### 4. State Response (Python -> Node)
+```json
+{
+  "id": "req_12346",
+  "status": "SUCCESS",
+  "data": {
+    "objects": [
+      { "name": "Box", "type": "Part::Feature", "properties": {"Length": 10, "Width": 10, "Height": 10} }
+    ]
+  }
+}
+```
diff --git a/docs/architecture/ai_cad_views/logical.md b/docs/architecture/ai_cad_views/logical.md
new file mode 100644
index 0000000..506e22f
--- /dev/null
+++ b/docs/architecture/ai_cad_views/logical.md
@@ -0,0 +1,30 @@
+# 1. Logical View: AI CAD Integration
+
+The Logical View describes the core components and their responsibilities.
+
+## Components
+
+1. **FlyCLI Core (JS):**
+   - Parses the `flycli cad` command.
+   - Manages the interaction with the Gemini API.
+
+2. **FreeCAD Manager (JS):**
+   - Responsible for the lifecycle of the FreeCAD process.
+   - Checks for the existence of the portable FreeCAD installation.
+   - Downloads and extracts it if missing.
+   - Spawns the `FreeCAD.exe` process.
+
+3. **IPC Bridge (JS <-> Python):**
+   - **Node Side:** An IPC Server (TCP/WS) hosted by FlyCLI.
+   - **Python Side:** A listener script injected into FreeCAD on startup (`freecad_listener.py`).
+   - Translates MCP tool calls from Gemini into Python execution requests.
+
+4. **CadQuery Execution Engine (Python inside FreeCAD):**
+   - Receives CadQuery scripts from the IPC Bridge.
+   - Executes them in the context of the active FreeCAD document.
+   - Updates the 3D viewport.
+
+5. **External AI Agent (Any LLM Client):**
+   - Connects to FlyCLI via Model Context Protocol (MCP) using standard input/output (stdio).
+   - Generates CadQuery scripts via MCP tool calls.
+   - Consumes FreeCAD document state (e.g., bounding box, object tree) to refine models.
diff --git a/docs/business/OKR.md b/docs/business/OKR.md
index 096ec04..6363c10 100644
--- a/docs/business/OKR.md
+++ b/docs/business/OKR.md
@@ -10,3 +10,11 @@ Ensure that every automated process involving hardware configuration can be safe
 
 ## Pivot Logic & Reasoning
 If the JSON parsing fails for AI Agents due to visual artifacts, we must immediately pivot to a pure background headless mode for agents, separating human UI completely into a standalone tool.
+
+## Objective 2: Empower Amateurs with AI-Assisted CAD Design
+Transform FlyCLI from a mere configuration tool into a hardware development assistant by integrating an AI-driven, interactive 3D modeling workflow.
+
+**Key Results:**
+- **KR2.1:** Implement the `flycli cad` command that seamlessly orchestrates the FreeCAD GUI from Node.js by `v1.3.0`.
+- **KR2.2:** Establish a reliable IPC/CadQuery bridge allowing the AI (Gemini) to generate and instantly visualize solid models without user scripting.
+- **KR2.3:** Ensure a zero-friction distribution strategy where users don't need to manually configure FreeCAD paths or Python environments.
diff --git a/docs/reference/cad-examples.md b/docs/reference/cad-examples.md
new file mode 100644
index 0000000..54cd55c
--- /dev/null
+++ b/docs/reference/cad-examples.md
@@ -0,0 +1,72 @@
+# 📐 CAD Modeling Examples for AI Agents
+
+When using the `flycli cad` command, you (the AI Agent) can send Python scripts to FreeCAD via the `render_cadquery` tool. Here are common patterns.
+
+## 1. Simple Box (using Part API)
+If CadQuery is not available, use the built-in FreeCAD `Part` module.
+
+```python
+import FreeCAD as App
+import Part
+
+# Create a new document if none exists
+if not App.ActiveDocument:
+    App.newDocument("FlyCLI_Model")
+
+doc = App.ActiveDocument
+
+# Create a box: length, width, height
+box = Part.makeBox(10.0, 10.0, 10.0)
+obj = doc.addObject("Part::Feature", "MyBox")
+obj.Shape = box
+
+doc.recompute()
+```
+
+## 2. Drawing a Line (Box Line)
+Creating a polyline that forms a square (box-like boundary).
+
+```python
+import FreeCAD as App
+import Part
+
+if not App.ActiveDocument:
+    App.newDocument("FlyCLI_Model")
+
+doc = App.ActiveDocument
+
+# Define points
+p1 = App.Vector(0, 0, 0)
+p2 = App.Vector(10, 0, 0)
+p3 = App.Vector(10, 10, 0)
+p4 = App.Vector(0, 10, 0)
+
+# Create segments
+l1 = Part.LineSegment(p1, p2)
+l2 = Part.LineSegment(p2, p3)
+l3 = Part.LineSegment(p3, p4)
+l4 = Part.LineSegment(p4, p1)
+
+# Create a wire (box outline)
+wire = Part.Wire([l1.toShape(), l2.toShape(), l3.toShape(), l4.toShape()])
+obj = doc.addObject("Part::Feature", "BoxLine")
+obj.Shape = wire
+
+doc.recompute()
+```
+
+## 3. Using CadQuery (Preferred if available)
+CadQuery is much more concise for complex geometry.
+
+```python
+import cadquery as cq
+
+# Create a box 10x10x10 and show it
+result = cq.Workplane("XY").box(10, 10, 10)
+show_object(result)
+```
+
+## Tips:
+- Always check if `App.ActiveDocument` exists.
+- Call `doc.recompute()` after adding objects.
+- Use `process.stderr` for progress feedback and `process.stdout` for JSON results.
diff --git a/docs/reference/cli-commands.md b/docs/reference/cli-commands.md
index b21d5e7..14703f9 100644
--- a/docs/reference/cli-commands.md
+++ b/docs/reference/cli-commands.md
@@ -63,5 +63,19 @@ This document contains a complete list of commands built into your flight contro
 
 ---
 
+## 🏗 FlyCLI Infrastructure Commands
+
+These commands manage the FlyCLI tool itself and its advanced features like CAD integration.
+
+| Command | Description |
+| --- | --- |
+| `scan` | Scans for available serial ports to find flight controllers. |
+| `health` | Performs basic diagnostics (voltage, version, status) of the FC. |
+| `context` | Retrieves documentation and usage tips for AI agents. |
+| `wizard` | Starts interactive setup processes (e.g., `rx` for radio calibration). |
+| `cad` | Starts the CAD Agent (MCP Server) to orchestrate FreeCAD for 3D modeling. |
+
+---
+
 ### Note for AI Agent:
 This command list is the basis for automated diagnostics. If you want to check hardware health, start with `status` and `resource show`. To change behavior, use `get/set` and necessarily `save`.
diff --git a/fpv_boat.stl b/fpv_boat.stl
new file mode 100644
index 0000000..e2a2b85
Binary files /dev/null and b/fpv_boat.stl differ
diff --git a/index.js b/index.js
index 07af2ca..20d3298 100755
--- a/index.js
+++ b/index.js
@@ -6,13 +6,14 @@ import executeCommand from './src/interfaces/cli/execute.js';
 import healthCommand from './src/interfaces/cli/health.js';
 import contextCommand from './src/interfaces/cli/context.js';
 import wizardCommand from './src/interfaces/cli/wizard.js';
+import cadCommand from './src/interfaces/cli/cad.js';
 
 const program = new Command();
 
 program
   .name('flycli')
   .description('CLI tool for Betaflight flight controller interaction')
-  .version('1.0.0');
+  .version('1.3.1');
 
 program
   .command('scan')
@@ -54,4 +55,9 @@ program
   .option('--json', 'Output final result as JSON for AI Agents')
   .action(wizardCommand);
 
+program
+  .command('cad')
+  .description('Start an interactive AI-powered CAD session with FreeCAD (MCP Server)')
+  .action(cadCommand);
+
 program.parse();
diff --git a/launcher.cjs b/launcher.cjs
index bf798f3..21c47b0 100644
--- a/launcher.cjs
+++ b/launcher.cjs
@@ -1,3 +1,19 @@
-(async () => {
-  await import('./index.js');
-})();
+const { spawn } = require('child_process');
+const path = require('path');
+
+// Це спрощений запуск FreeCAD для утримання вікна відкритим
+const executablePath = '/Applications/FreeCAD.app/Contents/MacOS/FreeCAD';
+const listenerPath = path.resolve(__dirname, 'assets/python/freecad_listener.py');
+const port = '9099';
+
+console.log('🚀 Запуск незалежної сесії FreeCAD...');
+
+const child = spawn(executablePath, [listenerPath, port], {
+  detached: true,
+  stdio: 'ignore'
+});
+
+child.unref();
+
+console.log('✅ FreeCAD запущено в незалежному режимі. Вікно має залишатися відкритим.');
+process.exit(0);
diff --git a/package-lock.json b/package-lock.json
index c3f1dbf..103680c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,14 +1,15 @@
 {
   "name": "flycli",
-  "version": "1.1.0",
+  "version": "1.3.1",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "flycli",
-      "version": "1.1.0",
+      "version": "1.3.1",
       "license": "MIT",
       "dependencies": {
+        "@modelcontextprotocol/sdk": "^1.29.0",
         "@yao-pkg/pkg": "^5.12.0",
         "commander": "^14.0.3",
         "esbuild": "^0.28.0",
@@ -1402,6 +1403,18 @@
         "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
       }
     },
+    "node_modules/@hono/node-server": {
+      "version": "1.19.14",
+      "resolved": "https://registry.npmjs.org/@hono/node-server/-/node-server-1.19.14.tgz",
+      "integrity": "sha512-GwtvgtXxnWsucXvbQXkRgqksiH2Qed37H9xHZocE5sA3N8O8O8/8FA3uclQXxXVzc9XBZuEOMK7+r02FmSpHtw==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=18.14.1"
+      },
+      "peerDependencies": {
+        "hono": "^4"
+      }
+    },
     "node_modules/@humanwhocodes/config-array": {
       "version": "0.13.0",
       "resolved": "https://registry.npmjs.org/@humanwhocodes/config-array/-/config-array-0.13.0.tgz",
@@ -2362,6 +2375,68 @@
         "@jridgewell/sourcemap-codec": "^1.4.14"
       }
     },
+    "node_modules/@modelcontextprotocol/sdk": {
+      "version": "1.29.0",
+      "resolved": "https://registry.npmjs.org/@modelcontextprotocol/sdk/-/sdk-1.29.0.tgz",
+      "integrity": "sha512-zo37mZA9hJWpULgkRpowewez1y6ML5GsXJPY8FI0tBBCd77HEvza4jDqRKOXgHNn867PVGCyTdzqpz0izu5ZjQ==",
+      "license": "MIT",
+      "dependencies": {
+        "@hono/node-server": "^1.19.9",
+        "ajv": "^8.17.1",
+        "ajv-formats": "^3.0.1",
+        "content-type": "^1.0.5",
+        "cors": "^2.8.5",
+        "cross-spawn": "^7.0.5",
+        "eventsource": "^3.0.2",
+        "eventsource-parser": "^3.0.0",
+        "express": "^5.2.1",
+        "express-rate-limit": "^8.2.1",
+        "hono": "^4.11.4",
+        "jose": "^6.1.3",
+        "json-schema-typed": "^8.0.2",
+        "pkce-challenge": "^5.0.0",
+        "raw-body": "^3.0.0",
+        "zod": "^3.25 || ^4.0",
+        "zod-to-json-schema": "^3.25.1"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "peerDependencies": {
+        "@cfworker/json-schema": "^4.1.1",
+        "zod": "^3.25 || ^4.0"
+      },
+      "peerDependenciesMeta": {
+        "@cfworker/json-schema": {
+          "optional": true
+        },
+        "zod": {
+          "optional": false
+        }
+      }
+    },
+    "node_modules/@modelcontextprotocol/sdk/node_modules/ajv": {
+      "version": "8.20.0",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-8.20.0.tgz",
+      "integrity": "sha512-Thbli+OlOj+iMPYFBVBfJ3OmCAnaSyNn4M1vz9T6Gka5Jt9ba/HIR56joy65tY6kx/FCF5VXNB819Y7/GUrBGA==",
+      "license": "MIT",
+      "dependencies": {
+        "fast-deep-equal": "^3.1.3",
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+        "unpipe": "~1.0.0"
+      },
+      "engines": {
+        "node": ">= 0.10"
+      }
+    },
     "node_modules/rc": {
       "version": "1.2.8",
       "resolved": "https://registry.npmjs.org/rc/-/rc-1.2.8.tgz",
@@ -8452,7 +9042,6 @@
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-      "dev": true,
       "license": "MIT",
       "engines": {
         "node": ">=0.10.0"
@@ -8539,6 +9128,22 @@
         "url": "https://github.com/sponsors/isaacs"
       }
     },
+    "node_modules/router": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/router/-/router-2.2.0.tgz",
+      "integrity": "sha512-nLTrUKm2UyiL7rlhapu/Zl45FwNgkZGaCpZbIHajDYgwlJCOzLSk+cIPAnsEqV955GjILJnKbdQC1nVPz+gAYQ==",
+      "license": "MIT",
+      "dependencies": {
+        "debug": "^4.4.0",
+        "depd": "^2.0.0",
+        "is-promise": "^4.0.0",
+        "parseurl": "^1.3.3",
+        "path-to-regexp": "^8.0.0"
+      },
+      "engines": {
+        "node": ">= 18"
+      }
+    },
     "node_modules/run-parallel": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/run-parallel/-/run-parallel-1.2.0.tgz",
@@ -8634,6 +9239,12 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/safer-buffer": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/safer-buffer/-/safer-buffer-2.1.2.tgz",
+      "integrity": "sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg==",
+      "license": "MIT"
+    },
     "node_modules/seed-random": {
       "version": "2.2.0",
       "resolved": "https://registry.npmjs.org/seed-random/-/seed-random-2.2.0.tgz",
@@ -8651,6 +9262,32 @@
         "semver": "bin/semver.js"
       }
     },
+    "node_modules/send": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/send/-/send-1.2.1.tgz",
+      "integrity": "sha512-1gnZf7DFcoIcajTjTwjwuDjzuz4PPcY2StKPlsGAQ1+YH20IRVrBaXSWmdjowTJ6u8Rc01PoYOGHXfP1mYcZNQ==",
+      "license": "MIT",
+      "dependencies": {
+        "debug": "^4.4.3",
+        "encodeurl": "^2.0.0",
+        "escape-html": "^1.0.3",
+        "etag": "^1.8.1",
+        "fresh": "^2.0.0",
+        "http-errors": "^2.0.1",
+        "mime-types": "^3.0.2",
+        "ms": "^2.1.3",
+        "on-finished": "^2.4.1",
+        "range-parser": "^1.2.1",
+        "statuses": "^2.0.2"
+      },
+      "engines": {
+        "node": ">= 18"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
+      }
+    },
     "node_modules/serialport": {
       "version": "13.0.0",
       "resolved": "https://registry.npmjs.org/serialport/-/serialport-13.0.0.tgz",
@@ -8696,6 +9333,25 @@
         }
       }
     },
+    "node_modules/serve-static": {
+      "version": "2.2.1",
+      "resolved": "https://registry.npmjs.org/serve-static/-/serve-static-2.2.1.tgz",
+      "integrity": "sha512-xRXBn0pPqQTVQiC8wyQrKs2MOlX24zQ0POGaj0kultvoOCstBQM5yvOhAVSUwOMjQtTvsPWoNCHfPGwaaQJhTw==",
+      "license": "MIT",
+      "dependencies": {
+        "encodeurl": "^2.0.0",
+        "escape-html": "^1.0.3",
+        "parseurl": "^1.3.3",
+        "send": "^1.2.0"
+      },
+      "engines": {
+        "node": ">= 18"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
+      }
+    },
     "node_modules/set-function-length": {
       "version": "1.2.2",
       "resolved": "https://registry.npmjs.org/set-function-length/-/set-function-length-1.2.2.tgz",
@@ -8745,11 +9401,16 @@
         "node": ">= 0.4"
       }
     },
+    "node_modules/setprototypeof": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/setprototypeof/-/setprototypeof-1.2.0.tgz",
+      "integrity": "sha512-E5LDX7Wrp85Kil5bhZv46j8jOeboKq5JMmYM3gVGdGH8xFpPWXUMsNrlODCrkoxMEeNi/XZIwuRvY4XNwYMJpw==",
+      "license": "ISC"
+    },
     "node_modules/shebang-command": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/shebang-command/-/shebang-command-2.0.0.tgz",
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-      "dev": true,
       "license": "MIT",
       "dependencies": {
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@@ -8762,7 +9423,6 @@
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-      "dev": true,
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@@ -8772,7 +9432,6 @@
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-      "dev": true,
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@@ -8792,7 +9451,6 @@
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-      "dev": true,
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@@ -8809,7 +9467,6 @@
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-      "dev": true,
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@@ -8828,7 +9485,6 @@
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-      "dev": true,
       "license": "MIT",
       "dependencies": {
         "call-bound": "^1.0.2",
@@ -8997,6 +9653,15 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/statuses": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/statuses/-/statuses-2.0.2.tgz",
+      "integrity": "sha512-DvEy55V3DB7uknRo+4iOGT5fP1slR8wQohVdknigZPMpMstaKJQWhwiYBACJE3Ul2pTnATihhBYnRhZQHGBiRw==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
     "node_modules/stop-iteration-iterator": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/stop-iteration-iterator/-/stop-iteration-iterator-1.1.0.tgz",
@@ -9405,6 +10070,15 @@
         "node": ">=8.0"
       }
     },
+    "node_modules/toidentifier": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/toidentifier/-/toidentifier-1.0.1.tgz",
+      "integrity": "sha512-o5sSPKEkg/DIQNmH43V0/uerLrpzVedkUh8tGNvaeXpfpuwjKenlSox/2O/BTlZUtEe+JG7s5YhEz608PlAHRA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.6"
+      }
+    },
     "node_modules/toposort": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/toposort/-/toposort-2.0.2.tgz",
@@ -9560,6 +10234,37 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/type-is": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/type-is/-/type-is-2.1.0.tgz",
+      "integrity": "sha512-faYHw0anBbc/kWF3zFTEnxSFOAGUX9GFbOBthvDdLsIlEoWOFOtS0zgCiQYwIskL9iGXZL3kAXD8OoZ4GmMATA==",
+      "license": "MIT",
+      "dependencies": {
+        "content-type": "^2.0.0",
+        "media-typer": "^1.1.0",
+        "mime-types": "^3.0.0"
+      },
+      "engines": {
+        "node": ">= 18"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
+      }
+    },
+    "node_modules/type-is/node_modules/content-type": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/content-type/-/content-type-2.0.0.tgz",
+      "integrity": "sha512-j/O/d7GcZCyNl7/hwZAb606rzqkyvaDctLmckbxLzHvFBzTJHuGEdodATcP3yIRoDrLHkIATJuvzbFlp/ki2cQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
+      }
+    },
     "node_modules/typed-array-buffer": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/typed-array-buffer/-/typed-array-buffer-1.0.3.tgz",
@@ -9686,6 +10391,15 @@
         "node": ">= 10.0.0"
       }
     },
+    "node_modules/unpipe": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
+      "integrity": "sha512-pjy2bYhSsufwWlKwPc+l3cN7+wuJlK6uz0YdJEOlQDbl6jo/YlPi4mb8agUkVC8BF7V8NuzeyPNqRksA3hztKQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
     "node_modules/update-browserslist-db": {
       "version": "1.2.3",
       "resolved": "https://registry.npmjs.org/update-browserslist-db/-/update-browserslist-db-1.2.3.tgz",
@@ -9776,6 +10490,15 @@
         "spdx-expression-parse": "^3.0.0"
       }
     },
+    "node_modules/vary": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
+      "integrity": "sha512-BNGbWLfd0eUPabhkXUVm0j8uuvREyTh5ovRa/dyow/BqAbZJyC+5fU+IzQOzmAKzYqYRAISoRhdQr3eIZ/PXqg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
     "node_modules/walker": {
       "version": "1.0.8",
       "resolved": "https://registry.npmjs.org/walker/-/walker-1.0.8.tgz",
@@ -9819,7 +10542,6 @@
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
       "integrity": "sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==",
-      "dev": true,
       "license": "ISC",
       "dependencies": {
         "isexe": "^2.0.0"
@@ -10076,6 +10798,24 @@
       "funding": {
         "url": "https://github.com/sponsors/sindresorhus"
       }
+    },
+    "node_modules/zod": {
+      "version": "4.4.3",
+      "resolved": "https://registry.npmjs.org/zod/-/zod-4.4.3.tgz",
+      "integrity": "sha512-ytENFjIJFl2UwYglde2jchW2Hwm4GJFLDiSXWdTrJQBIN9Fcyp7n4DhxJEiWNAJMV1/BqWfW/kkg71UDcHJyTQ==",
+      "license": "MIT",
+      "funding": {
+        "url": "https://github.com/sponsors/colinhacks"
+      }
+    },
+    "node_modules/zod-to-json-schema": {
+      "version": "3.25.2",
+      "resolved": "https://registry.npmjs.org/zod-to-json-schema/-/zod-to-json-schema-3.25.2.tgz",
+      "integrity": "sha512-O/PgfnpT1xKSDeQYSCfRI5Gy3hPf91mKVDuYLUHZJMiDFptvP41MSnWofm8dnCm0256ZNfZIM7DSzuSMAFnjHA==",
+      "license": "ISC",
+      "peerDependencies": {
+        "zod": "^3.25.28 || ^4"
+      }
     }
   }
 }
diff --git a/package.json b/package.json
index a09ac7b..de36685 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "flycli",
-  "version": "1.1.0",
+  "version": "1.3.1",
   "description": "A reliable CLI tool for Betaflight flight controller interaction and automation.",
   "license": "MIT",
   "keywords": [
@@ -59,6 +59,7 @@
     "node": ">=18"
   },
   "dependencies": {
+    "@modelcontextprotocol/sdk": "^1.29.0",
     "@yao-pkg/pkg": "^5.12.0",
     "commander": "^14.0.3",
     "esbuild": "^0.28.0",
diff --git a/skills/flycli/SKILL.md b/skills/flycli/SKILL.md
index d0bba6b..9125175 100644
--- a/skills/flycli/SKILL.md
+++ b/skills/flycli/SKILL.md
@@ -39,8 +39,39 @@ Executes raw CLI commands on the flight controller.
 - **File Input**: You can also pass a file containing multiple CLI commands using `-f <path>` or `--file <path>`.
 - **Agent Usage**: Use this to read configurations (`dump`, `diff all`) or apply changes (`set ...`, `save`). Always remember to send `save` if you expect settings to persist.
 
-## 🔄 Recommended Workflow for Agents
+### 5. `cad`
+Starts an interactive CAD modeling session with FreeCAD using the Model Context Protocol (MCP).
+- **Command**: `flycli cad`
+- **Agent Usage**: This command starts an MCP server on `stdio`. Once started, you (the agent) can use specialized tools to interact with FreeCAD:
+    - `render_cadquery`: Executes CadQuery Python code to create or modify 3D models.
+    - `get_engine_state`: Returns the list of objects currently in the FreeCAD document.
+- **Example Flow**:
+    1. Run `flycli cad`.
+    2. Use `render_cadquery` with code like:
+       ```python
+       import cadquery as cq
+       result = cq.Workplane("XY").box(10, 10, 10)
+       show_object(result)
+       ```
+    3. The model will appear in the FreeCAD GUI.
+
+    ## 🤝 Human-in-the-Loop CAD Workflow
+
+    To effectively collaborate with a human designer, you must follow the **Synchronize-and-React** protocol:
 
+    1. **Verify Before Act**: Before modifying or adding new geometry, always run `get_engine_state` to see what the user has changed manually.
+    2. **Respect Human Intent**: If a human deletes an object you created, do not recreate it without asking. Interpret it as a design correction.
+    3. **Contextual Awareness**: If you detect new objects added by the human, acknowledge them. Use their names and properties as context for your next steps (e.g., "I see you added a mounting hole, I will now align the bracket to it").
+    4. **Visual Feedback**: Use `process.stderr` to explain what you are doing in plain language while keeping `process.stdout` clean for JSON results.
+
+## 🛡️ Interactive CAD UX Standards
+1. **Window Persistence**: NEVER close the FreeCAD window once it's open. Use detached processes to ensure the user doesn't lose their visual context.
+2. **Zero-File Policy**: Do NOT create temporary `.json` or `.py` files in the project root for CAD operations. Send commands directly via IPC/MCP tools.
+3. **Live Feedback**: Before executing any 3D command, describe it in one sentence to the user.
+4. **Interactive Co-creation**: If the user has FreeCAD open, always try to "attach" to the existing session rather than starting a new one.
+
+## 🔄 Recommended Workflow for Agents
+    ...
 1. **Discover**: Run `flycli scan --json` to get the port.
 2. **Verify**: Run `flycli health <port> 115200 --json` to ensure the FC is responding.
 3. **Backup/Read**: Run `flycli execute <port> 115200 "diff all" --json` to capture current state.
diff --git a/src/infrastructure/ai/McpCadTools.js b/src/infrastructure/ai/McpCadTools.js
new file mode 100644
index 0000000..8d32dee
--- /dev/null
+++ b/src/infrastructure/ai/McpCadTools.js
@@ -0,0 +1,108 @@
+/**
+ * @module McpCadTools
+ * @description Provides Gemini-facing MCP tool definitions for CAD interaction.
+ *
+ * Traceability:
+ *   - Interface: ddd_interfaces.md § ICadEngineProcess (IpcBridge contract)
+ *   - Architecture: implementation_plan.md § [NEW] src/infrastructure/ai/McpCadTools.js
+ *   - Domain terms: GeometryScript, EngineState, IpcBridge (ddd_interfaces.md)
+ *   - CQRS: renderCadQuery is a Command; getEngineState / getToolDefinitions are Queries.
+ */
+
+/**
+ * Tool definition schema for Gemini function-calling API.
+ * @typedef {Object} ToolDefinition
+ * @property {string} name
+ * @property {string} description
+ * @property {Object} parameters
+ */
+
+const RENDER_TOOL = {
+  name: 'render_cadquery',
+  description:
+    'Executes a CadQuery (Python) GeometryScript inside the running FreeCAD window. '
+    + 'Call this tool whenever you have generated 3D model code to display or update.',
+  parameters: {
+    type: 'object',
+    properties: {
+      code: {
+        type: 'string',
+        description: 'Valid CadQuery Python code. Must not be empty.',
+      },
+    },
+    required: ['code'],
+  },
+};
+
+const STATE_TOOL = {
+  name: 'get_engine_state',
+  description:
+    'Returns the current EngineState: the list of objects in the open FreeCAD document. '
+    + 'Use this to understand what is already rendered before making changes.',
+  parameters: {
+    type: 'object',
+    properties: {},
+    required: [],
+  },
+};
+
+const TOOL_DEFINITIONS = [RENDER_TOOL, STATE_TOOL];
+
+/**
+ * Validates that a GeometryScript is a non-empty string.
+ * @param {unknown} code
+ * @throws {Error} if code is not a non-empty string
+ */
+function assertValidScript(code) {
+  if (typeof code !== 'string' || code.trim().length === 0) {
+    throw new Error('GeometryScript must be a non-empty string.');
+  }
+}
+
+/**
+ * Provides Gemini-facing MCP tool definitions and delegates execution to CadEngineProcess.
+ * @implements {ICadToolsProvider}
+ */
+export class McpCadTools {
+  /**
+   * @param {import('../cad/CadEngineProcess.js').CadEngineProcess} engine
+   */
+  constructor(engine) {
+    this.engine = engine;
+  }
+
+  /**
+   * [COMMAND] Sends a GeometryScript to FreeCAD for execution via the IpcBridge.
+   * Mutates CAD document state; returns execution metadata.
+   *
+   * @param {string} code - Python/CadQuery GeometryScript
+   * @returns {Promise<Object>} Execution result from CadEngineProcess
+   * @throws {Error} If code is invalid or engine returns an error
+   */
+  async renderCadQuery(code) {
+    assertValidScript(code);
+    return this.engine.executeScript(code);
+  }
+
+  /**
+   * [QUERY] Reads the current EngineState from the open FreeCAD document.
+   * Returns data; produces no side effects.
+   *
+   * @returns {Promise<Object>} Serialized EngineState (object tree)
+   */
+  async getEngineState() {
+    return this.engine.getDocumentState();
+  }
+
+  /**
+   * [QUERY] Returns the list of Gemini tool definitions for CAD interaction.
+   * Static — returns module-level constants, no instance state required.
+   *
+   * @returns {ToolDefinition[]}
+   */
+  static getToolDefinitions() {
+    return TOOL_DEFINITIONS;
+  }
+}
+
+export default McpCadTools;
diff --git a/src/infrastructure/cad/CadEngineProcess.js b/src/infrastructure/cad/CadEngineProcess.js
new file mode 100644
index 0000000..efc5f03
--- /dev/null
+++ b/src/infrastructure/cad/CadEngineProcess.js
@@ -0,0 +1,258 @@
+import { spawn } from 'child_process';
+import net from 'net';
+import path from 'path';
+import { fileURLToPath } from 'url';
+
+const filename = fileURLToPath(import.meta.url);
+const dirname = path.dirname(filename);
+
+/**
+ * @module CadEngineProcess
+ * @description Manages the FreeCAD process and IPC communication (IpcBridge).
+ *
+ * Traceability:
+ *   - Interface: ddd_interfaces.md § ICadEngineProcess, IpcBridge
+ *   - Architecture: implementation_plan.md § CadEngineProcess
+ *   - IPC Payload: ddd_interfaces.md § IPC Payload Contracts (JSON over TCP)
+ *   - CQRS: start/stop/executeScript [Commands]; getDocumentState [Query]
+ */
+
+const DEFAULT_PORT = 9099;
+const MAX_RETRIES = 15;
+const RETRY_DELAY_MS = 1000;
+
+/**
+ * Returns the absolute path to the Python IPC listener script.
+ * @returns {string}
+ */
+function resolveListenerPath() {
+  return path.resolve(dirname, '../../../assets/python/freecad_listener.py');
+}
+
+/**
+ * Parses a newline-delimited JSON buffer and returns complete messages.
+ * @param {string} buffer
+ * @returns {{ messages: Object[], remaining: string }}
+ */
+function parseBuffer(buffer) {
+  const messages = [];
+  let remaining = buffer;
+  let idx = remaining.indexOf('\n');
+
+  while (idx !== -1) {
+    const line = remaining.slice(0, idx).trim();
+    remaining = remaining.slice(idx + 1);
+
+    if (line) {
+      try {
+        messages.push(JSON.parse(line));
+      } catch {
+        /*
+         * Malformed JSON from FreeCAD — silently skip.
+         * The caller logs errors via _handleResponse.
+         */
+      }
+    }
+    idx = remaining.indexOf('\n');
+  }
+
+  return { messages, remaining };
+}
+
+/**
+ * Attempts a single TCP connection to the IPC socket.
+ * @param {number} port
+ * @returns {Promise<net.Socket>}
+ */
+function tryConnect(port) {
+  return new Promise((resolve, reject) => {
+    const socket = new net.Socket();
+    socket.connect(port, '127.0.0.1', () => resolve(socket));
+    socket.on('error', (err) => {
+      socket.destroy();
+      reject(err);
+    });
+  });
+}
+
+/**
+ * Manages the FreeCAD process and IPC communication.
+ * @implements {ICadEngineProcess}
+ */
+export class CadEngineProcess {
+  /**
+   * @param {object} logger
+   */
+  constructor(logger = console) {
+    this.logger = logger;
+    this.process = null;
+    this.socket = null;
+    this.port = DEFAULT_PORT;
+    this.requestMap = new Map();
+    this.requestIdCounter = 1;
+  }
+
+  /**
+   * [COMMAND] Starts the FreeCAD process and connects to the IpcBridge.
+   * @param {string} executablePath
+   * @returns {Promise<void>}
+   */
+  async start(executablePath) {
+    if (this.process) {
+      throw new Error('FreeCAD process is already running.');
+    }
+
+    const listenerPath = resolveListenerPath();
+    this.logger.info(`Launching FreeCAD from ${executablePath}...`);
+
+    this.process = spawn(executablePath, [listenerPath, String(this.port)], {
+      detached: false,
+      stdio: ['ignore', 'pipe', 'pipe'],
+    });
+
+    this.process.stdout.on('data', (data) => {
+      this.logger.debug(`[FreeCAD STDOUT]: ${data.toString().trim()}`);
+    });
+
+    this.process.stderr.on('data', (data) => {
+      this.logger.debug(`[FreeCAD STDERR]: ${data.toString().trim()}`);
+    });
+
+    this.process.on('close', (code) => {
+      this.logger.info(`FreeCAD process exited with code ${code}`);
+      this.process = null;
+      this.socket = null;
+    });
+
+    await this.waitForConnection();
+  }
+
+  /**
+   * Retries TCP connection until FreeCAD IPC socket is available.
+   * @param {number} retries
+   * @param {number} delayMs
+   * @returns {Promise<void>}
+   */
+  async waitForConnection(retries = MAX_RETRIES, delayMs = RETRY_DELAY_MS) {
+    let attempts = 0;
+
+    const attempt = async () => {
+      attempts += 1;
+      this.logger.info(`Attempting IPC connection… (${attempts}/${retries})`);
+
+      try {
+        this.socket = await tryConnect(this.port);
+        this.setupSocketListeners();
+        this.logger.info('Connected to FreeCAD IPC.');
+      } catch {
+        if (attempts >= retries) {
+          throw new Error(`Failed to connect to FreeCAD IPC after ${retries} attempts.`);
+        }
+        await new Promise((res) => { setTimeout(res, delayMs); });
+        await attempt();
+      }
+    };
+
+    await attempt();
+  }
+
+  /**
+   * Wires data/close handlers on the IPC socket.
+   */
+  setupSocketListeners() {
+    let buffer = '';
+
+    this.socket.on('data', (data) => {
+      buffer += data.toString('utf-8');
+      const { messages, remaining } = parseBuffer(buffer);
+      buffer = remaining;
+      messages.forEach((msg) => this.handleResponse(msg));
+    });
+
+    this.socket.on('close', () => {
+      this.logger.info('IPC connection closed.');
+      this.socket = null;
+    });
+  }
+
+  /**
+   * Resolves or rejects a pending request based on the IPC response.
+   * @param {Object} response
+   */
+  handleResponse(response) {
+    const { id } = response;
+
+    if (!this.requestMap.has(id)) {
+      return;
+    }
+
+    const { resolve, reject } = this.requestMap.get(id);
+    this.requestMap.delete(id);
+
+    if (response.status === 'ERROR') {
+      reject(new Error(`CadEngine Error: ${JSON.stringify(response.error)}`));
+    } else {
+      resolve(response.data);
+    }
+  }
+
+  /**
+   * Sends a JSON request over the IPC socket and returns a Promise.
+   * @param {string} action
+   * @param {Object} payload
+   * @returns {Promise<Object>}
+   */
+  sendRequest(action, payload = {}) {
+    if (!this.socket) {
+      return Promise.reject(new Error('IPC Socket is not connected.'));
+    }
+
+    return new Promise((resolve, reject) => {
+      const id = `req_${this.requestIdCounter}`;
+      this.requestIdCounter += 1;
+      this.requestMap.set(id, { resolve, reject });
+
+      const msg = `${JSON.stringify({ id, action, payload })}\n`;
+      this.socket.write(msg, 'utf-8', (err) => {
+        if (err) {
+          this.requestMap.delete(id);
+          reject(err);
+        }
+      });
+    });
+  }
+
+  /**
+   * [COMMAND] Stops the FreeCAD process and closes the IPC socket.
+   * @returns {Promise<void>}
+   */
+  async stop() {
+    if (this.socket) {
+      this.socket.destroy();
+      this.socket = null;
+    }
+    if (this.process) {
+      this.process.kill();
+      this.process = null;
+    }
+  }
+
+  /**
+   * [COMMAND] Sends a GeometryScript to FreeCAD for execution.
+   * @param {string} scriptContent - Python/CadQuery code
+   * @returns {Promise<Object>} Execution result
+   */
+  async executeScript(scriptContent) {
+    return this.sendRequest('EXECUTE_SCRIPT', { code: scriptContent });
+  }
+
+  /**
+   * [QUERY] Reads the object tree from the open FreeCAD document.
+   * @returns {Promise<Object>} Serialized EngineState
+   */
+  async getDocumentState() {
+    return this.sendRequest('GET_STATE');
+  }
+}
+
+export default CadEngineProcess;
diff --git a/src/infrastructure/cad/EnvironmentManager.js b/src/infrastructure/cad/EnvironmentManager.js
new file mode 100644
index 0000000..ea7b445
--- /dev/null
+++ b/src/infrastructure/cad/EnvironmentManager.js
@@ -0,0 +1,103 @@
+import fs from 'fs/promises';
+
+/**
+ * @module EnvironmentManager
+ * @description Manages the lifecycle of the portable FreeCAD environment.
+ *   Searches known installation paths and validates executable presence.
+ *
+ * Traceability:
+ *   - Interface: ddd_interfaces.md § IEnvironmentManager
+ *   - Architecture: implementation_plan.md § EnvironmentManager
+ *   - CQRS: ensureEnvironmentReady [Command/Query hybrid — resolves path, validates FS]
+ *           getStatus [Query]
+ */
+
+const WINDOWS_PATHS = [
+  'C:\\Program Files\\FreeCAD 0.21\\bin\\FreeCAD.exe',
+  'C:\\Program Files\\FreeCAD 0.20\\bin\\FreeCAD.exe',
+  'C:\\Program Files\\FreeCAD 1.0\\bin\\FreeCAD.exe',
+];
+
+const UNIX_PATHS = [
+  '/usr/bin/freecad',
+  '/Applications/FreeCAD.app/Contents/MacOS/FreeCAD',
+];
+
+/**
+ * Builds the list of candidate paths to check, including the env override.
+ * @returns {string[]}
+ */
+function buildCandidatePaths() {
+  const envPath = process.env.FREECAD_PATH;
+  const base = [...WINDOWS_PATHS, ...UNIX_PATHS];
+  return envPath ? [envPath, ...base] : base;
+}
+
+/**
+ * Checks whether a file exists at the given path.
+ * @param {string} filePath
+ * @returns {Promise<boolean>}
+ */
+async function fileExists(filePath) {
+  try {
+    const stats = await fs.stat(filePath);
+    return stats.isFile();
+  } catch {
+    return false;
+  }
+}
+
+/**
+ * Finds the first existing FreeCAD executable from the candidate list.
+ * @param {string[]} candidates
+ * @returns {Promise<string|null>}
+ */
+async function findExecutable(candidates) {
+  const checks = candidates.map((p) => fileExists(p).then((ok) => (ok ? p : null)));
+  const results = await Promise.all(checks);
+  return results.find((p) => p !== null) ?? null;
+}
+
+/**
+ * Manages the lifecycle of the portable FreeCAD environment.
+ * @implements {IEnvironmentManager}
+ */
+export class EnvironmentManager {
+  /**
+   * @param {object} logger
+   */
+  constructor(logger = console) {
+    this.logger = logger;
+  }
+
+  /**
+   * Checks for the environment; throws if not found.
+   * @returns {Promise<string>} Absolute path to the FreeCAD executable.
+   * @throws {Error} If no FreeCAD installation is found.
+   */
+  async ensureEnvironmentReady() {
+    this.logger.info('Checking for FreeCAD installation...');
+    const candidates = buildCandidatePaths();
+    const found = await findExecutable(candidates);
+
+    if (!found) {
+      throw new Error(
+        'FreeCAD installation not found. '
+        + 'Please install FreeCAD and set the FREECAD_PATH environment variable.',
+      );
+    }
+
+    this.logger.info(`Found FreeCAD at: ${found}`);
+    return found;
+  }
+
+  /**
+   * Returns current environment status.
+   * @returns {{ status: string, progress: number }}
+   */
+  static getStatus() {
+    return { status: 'ready', progress: 100 };
+  }
+}
+
+export default EnvironmentManager;
diff --git a/src/infrastructure/mcp/McpServer.js b/src/infrastructure/mcp/McpServer.js
new file mode 100644
index 0000000..4e161c1
--- /dev/null
+++ b/src/infrastructure/mcp/McpServer.js
@@ -0,0 +1,107 @@
+// eslint-disable-next-line import/no-unresolved
+import { Server } from '@modelcontextprotocol/sdk/server/index.js';
+// eslint-disable-next-line import/no-unresolved
+import { StdioServerTransport } from '@modelcontextprotocol/sdk/server/stdio.js';
+// eslint-disable-next-line import/no-unresolved
+import { CallToolRequestSchema, ListToolsRequestSchema } from '@modelcontextprotocol/sdk/types.js';
+import { McpCadTools } from '../ai/McpCadTools.js';
+
+/**
+ * @module McpServerAdapter
+ * @description Translates FlyCLI's McpCadTools into a standard MCP Stdio Server.
+ *
+ * Traceability:
+ *   - Interface: ddd_interfaces.md § IMcpServer
+ *   - Architecture: implementation_plan.md § [NEW] src/infrastructure/mcp/McpServer.js
+ *   - CQRS: start/stop [Commands]
+ */
+export class McpServerAdapter {
+  /**
+   * @param {McpCadTools} cadTools
+   * @param {object} logger
+   */
+  constructor(cadTools, logger = console) {
+    this.cadTools = cadTools;
+    this.logger = logger;
+
+    this.server = new Server(
+      { name: 'FlyCLI-CAD-Server', version: '1.2.0' },
+      { capabilities: { tools: {} } },
+    );
+
+    this.setupHandlers();
+  }
+
+  /**
+   * Handles the ListTools request by mapping definitions to SDK format.
+   * @returns {Object}
+   */
+  static handleListTools() {
+    const rawDefs = McpCadTools.getToolDefinitions();
+    const mappedTools = rawDefs.map((def) => ({
+      name: def.name,
+      description: def.description,
+      inputSchema: def.parameters,
+    }));
+    return { tools: mappedTools };
+  }
+
+  /**
+   * Handles the CallTool request by dispatching to local CadTools.
+   * @param {Object} request
+   * @returns {Promise<Object>}
+   */
+  async handleCallTool(request) {
+    const { name, arguments: args } = request.params;
+    try {
+      if (name === 'render_cadquery') {
+        const code = String(args?.code || '');
+        const result = await this.cadTools.renderCadQuery(code);
+        return {
+          content: [{ type: 'text', text: `Success: ${JSON.stringify(result)}` }],
+        };
+      }
+      if (name === 'get_engine_state') {
+        const state = await this.cadTools.getEngineState();
+        return {
+          content: [{ type: 'text', text: JSON.stringify(state) }],
+        };
+      }
+      throw new Error(`Unknown tool: ${name}`);
+    } catch (err) {
+      return {
+        content: [{ type: 'text', text: `Error executing tool: ${err.message}` }],
+        isError: true,
+      };
+    }
+  }
+
+  /**
+   * Wires the SDK request handlers to the local methods.
+   */
+  setupHandlers() {
+    this.server.setRequestHandler(ListToolsRequestSchema, () => McpServerAdapter.handleListTools());
+    this.server.setRequestHandler(CallToolRequestSchema, (req) => this.handleCallTool(req));
+  }
+
+  /**
+   * [COMMAND] Starts listening for MCP requests on stdio.
+   * @returns {Promise<void>}
+   */
+  async start() {
+    this.logger.info('Starting MCP Server on stdio...');
+    const transport = new StdioServerTransport();
+    await this.server.connect(transport);
+    this.logger.info('MCP Server running. Waiting for agent connection...');
+  }
+
+  /**
+   * [COMMAND] Stops the MCP server.
+   * @returns {Promise<void>}
+   */
+  async stop() {
+    await this.server.close();
+  }
+}
+
+export default McpServerAdapter;
diff --git a/src/interfaces/cli/cad.js b/src/interfaces/cli/cad.js
new file mode 100644
index 0000000..04a692b
--- /dev/null
+++ b/src/interfaces/cli/cad.js
@@ -0,0 +1,119 @@
+import { EnvironmentManager } from '../../infrastructure/cad/EnvironmentManager.js';
+import { CadEngineProcess } from '../../infrastructure/cad/CadEngineProcess.js';
+import { McpCadTools } from '../../infrastructure/ai/McpCadTools.js';
+import { McpServerAdapter } from '../../infrastructure/mcp/McpServer.js';
+import ConsoleLogger from '../../infrastructure/Logger.js';
+
+/**
+ * @module CadAgent
+ * @description Orchestrates the interactive CAD modeling session.
+ *   Acts as the top-level "CadAgent" from the DDD Ubiquitous Language:
+ *   External Agent (MCP) <-> CadAgent <-> IpcBridge <-> CadEngineProcess (FreeCAD)
+ *
+ * Traceability:
+ *   - Domain: ddd_interfaces.md § CadAgent
+ *   - Architecture: implementation_plan.md § [MODIFY] src/interfaces/cli/cad.js
+ *   - CQRS: startSession() is a Command (launches FreeCAD, starts MCP Server)
+ */
+
+/**
+ * Bootstraps the CadAgent infrastructure dependencies.
+ * @param {object} logger
+ * @returns {{ env: EnvironmentManager, engine: CadEngineProcess, mcpServer: McpServerAdapter }}
+ */
+function buildDependencies(logger) {
+  const env = new EnvironmentManager(logger);
+  const engine = new CadEngineProcess(logger);
+  const tools = new McpCadTools(engine);
+  const mcpServer = new McpServerAdapter(tools, logger);
+  return { env, engine, mcpServer };
+}
+
+/**
+ * Resolves the FreeCAD executable and starts the CadEngine process.
+ * @param {EnvironmentManager} env
+ * @param {CadEngineProcess} engine
+ * @returns {Promise<void>}
+ */
+async function startEngine(env, engine) {
+  const executablePath = await env.ensureEnvironmentReady();
+  await engine.start(executablePath);
+}
+
+/**
+ * Prints the CadAgent welcome banner to stdout.
+ */
+function printBanner() {
+  process.stderr.write('\n🚀 FlyCLI CAD Agent — Model Context Protocol (MCP) Server\n');
+  process.stderr.write(`${'-'.repeat(50)}\n`);
+  process.stderr.write('💡 FreeCAD is starting… Please wait.\n');
+}
+
+/**
+ * Prints a user-friendly error message to stderr.
+ * @param {Error} err
+ */
+function printError(err) {
+  process.stderr.write(`\n❌ CAD Agent Error: ${err.message}\n`);
+  process.stderr.write('💡 Tip: Make sure FreeCAD is installed or set the FREECAD_PATH env var.\n');
+}
+
+/**
+ * Helper to gracefully stop services.
+ * @param {McpServerAdapter} mcpServer
+ * @param {CadEngineProcess} engine
+ * @param {Function} resolveExit
+ */
+async function stopServices(mcpServer, engine, resolveExit) {
+  try {
+    await mcpServer.stop();
+  } finally {
+    await engine.stop();
+    if (resolveExit) resolveExit();
+  }
+}
+
+/**
+ * [COMMAND] Main CLI handler for `flycli cad`.
+ * Orchestrates EnvironmentManager → CadEngineProcess → McpServerAdapter.
+ * Guarantees engine.stop() is always called (graceful cleanup).
+ *
+ * @returns {Promise<void>}
+ */
+export default async function cadCommand() {
+  const logger = new ConsoleLogger();
+  const { env, engine, mcpServer } = buildDependencies(logger);
+
+  printBanner();
+
+  let isStopping = false;
+  let resolveExit;
+  const exitPromise = new Promise((resolve) => { resolveExit = resolve; });
+
+  const cleanup = async () => {
+    if (isStopping) return;
+    isStopping = true;
+    await stopServices(mcpServer, engine, resolveExit);
+  };
+
+  process.on('SIGINT', cleanup);
+  process.on('SIGTERM', cleanup);
+
+  try {
+    await startEngine(env, engine);
+    /*
+     * Note: Start the MCP Server on stdio.
+     * The Promise from mcpServer.start() will resolve when the server is ready,
+     * but the node process will stay alive because of the stdio event listeners.
+     */
+    await mcpServer.start();
+
+    await exitPromise;
+  } catch (err) {
+    if (!isStopping) {
+      printError(err);
+    }
+  } finally {
+    await cleanup();
+  }
+}
diff --git a/test/unit/CadCommand.test.js b/test/unit/CadCommand.test.js
new file mode 100644
index 0000000..2d96826
--- /dev/null
+++ b/test/unit/CadCommand.test.js
@@ -0,0 +1,98 @@
+import { jest } from '@jest/globals';
+
+/**
+ * Unit tests for CadCommand (src/interfaces/cli/cad.js)
+ *
+ * Traceability:
+ *   - User Story: Business Scenario "flycli cad"
+ *   - Architecture: implementation_plan.md § [MODIFY] src/interfaces/cli/cad.js
+ *   - Domain: CadAgent orchestrates EnvironmentManager + CadEngineProcess + McpServer
+ *   - Protocol: DEVELOPER.md (TDD — RED phase)
+ */
+
+// ─── Mocks ────────────────────────────────────────────────────────────────────
+
+const mockEnsureEnvironmentReady = jest.fn();
+const mockEngineStart = jest.fn();
+const mockEngineStop = jest.fn();
+const mockMcpStart = jest.fn();
+const mockMcpStop = jest.fn();
+
+jest.unstable_mockModule('../../src/infrastructure/cad/EnvironmentManager.js', () => ({
+  EnvironmentManager: jest.fn().mockImplementation(() => ({
+    ensureEnvironmentReady: mockEnsureEnvironmentReady,
+  })),
+}));
+
+jest.unstable_mockModule('../../src/infrastructure/cad/CadEngineProcess.js', () => ({
+  CadEngineProcess: jest.fn().mockImplementation(() => ({
+    start: mockEngineStart,
+    stop: mockEngineStop,
+  })),
+}));
+
+jest.unstable_mockModule('../../src/infrastructure/ai/McpCadTools.js', () => ({
+  McpCadTools: jest.fn(),
+}));
+
+jest.unstable_mockModule('../../src/infrastructure/mcp/McpServer.js', () => ({
+  McpServerAdapter: jest.fn().mockImplementation(() => ({
+    start: mockMcpStart,
+    stop: mockMcpStop,
+  })),
+}));
+
+const { default: cadCommand } = await import('../../src/interfaces/cli/cad.js');
+
+// ─── Tests ────────────────────────────────────────────────────────────────────
+
+const setup = () => {
+  jest.clearAllMocks();
+  mockEnsureEnvironmentReady.mockResolvedValue('/usr/bin/freecad');
+  mockEngineStart.mockResolvedValue(undefined);
+  mockEngineStop.mockResolvedValue(undefined);
+  mockMcpStart.mockResolvedValue(undefined);
+  mockMcpStop.mockResolvedValue(undefined);
+};
+
+describe('cadCommand — Happy Path', () => {
+  it('should bootstrap EnvironmentManager → CadEngineProcess → McpServerAdapter in sequence', async () => {
+    setup();
+    // Simulate graceful interruption since server runs indefinitely
+    mockMcpStart.mockImplementation(async () => {
+      // Simulate process.on('SIGINT') event
+      process.emit('SIGINT');
+    });
+
+    await cadCommand();
+
+    expect(mockEnsureEnvironmentReady).toHaveBeenCalledTimes(1);
+    expect(mockEngineStart).toHaveBeenCalledWith('/usr/bin/freecad');
+    expect(mockMcpStart).toHaveBeenCalledTimes(1);
+    expect(mockMcpStop).toHaveBeenCalledTimes(1);
+    expect(mockEngineStop).toHaveBeenCalledTimes(1);
+  });
+});
+
+describe('cadCommand — Error Handling', () => {
+  it('should call engine.stop() even when EnvironmentManager fails', async () => {
+    setup();
+    mockEnsureEnvironmentReady.mockRejectedValue(new Error('FreeCAD not found'));
+
+    // Should not throw — graceful exit
+    await expect(cadCommand()).resolves.not.toThrow();
+
+    expect(mockMcpStop).toHaveBeenCalledTimes(1);
+    expect(mockEngineStop).toHaveBeenCalledTimes(1);
+  });
+
+  it('should call mcpServer.stop() and engine.stop() when McpServer fails', async () => {
+    setup();
+    mockMcpStart.mockRejectedValue(new Error('Port in use'));
+
+    await expect(cadCommand()).resolves.not.toThrow();
+
+    expect(mockMcpStop).toHaveBeenCalledTimes(1);
+    expect(mockEngineStop).toHaveBeenCalledTimes(1);
+  });
+});
diff --git a/test/unit/McpCadTools.test.js b/test/unit/McpCadTools.test.js
new file mode 100644
index 0000000..6cb077c
--- /dev/null
+++ b/test/unit/McpCadTools.test.js
@@ -0,0 +1,94 @@
+import { jest } from '@jest/globals';
+
+/**
+ * Unit tests for McpCadTools
+ *
+ * Traceability:
+ *   - Requirement: ddd_interfaces.md § IpcBridge, GeometryScript
+ *   - Architecture: implementation_plan.md § [NEW] src/infrastructure/ai/McpCadTools.js
+ *   - Protocol: DEVELOPER.md (TDD — RED phase)
+ */
+
+const mockExecuteScript = jest.fn();
+const mockGetDocumentState = jest.fn();
+const mockStart = jest.fn();
+const mockStop = jest.fn();
+
+const mockEngine = {
+  start: mockStart,
+  stop: mockStop,
+  executeScript: mockExecuteScript,
+  getDocumentState: mockGetDocumentState,
+};
+
+const { McpCadTools } = await import('../../src/infrastructure/ai/McpCadTools.js');
+
+const setup = () => {
+  jest.clearAllMocks();
+  return new McpCadTools(mockEngine);
+};
+
+// ─── render_cadquery ──────────────────────────────────────────────────────────
+
+describe('McpCadTools.renderCadQuery — Success Path', () => {
+  it('should delegate cadquery code to CadEngineProcess.executeScript()', async () => {
+    const tools = setup();
+    mockExecuteScript.mockResolvedValue({ executionTimeMs: 50 });
+
+    const result = await tools.renderCadQuery('import cadquery as cq\ncq.Workplane().box(1,1,1)');
+
+    expect(mockExecuteScript).toHaveBeenCalledTimes(1);
+    expect(mockExecuteScript).toHaveBeenCalledWith('import cadquery as cq\ncq.Workplane().box(1,1,1)');
+    expect(result).toEqual({ executionTimeMs: 50 });
+  });
+});
+
+describe('McpCadTools.renderCadQuery — Error Path', () => {
+  it('should propagate CadEngine errors to the caller', async () => {
+    const tools = setup();
+    mockExecuteScript.mockRejectedValue(new Error('CadEngine Error: SyntaxError'));
+
+    await expect(tools.renderCadQuery('bad python code !!!'))
+      .rejects
+      .toThrow('CadEngine Error: SyntaxError');
+  });
+
+  it('should reject if code argument is empty or not a string', async () => {
+    const tools = setup();
+
+    await expect(tools.renderCadQuery('')).rejects.toThrow('GeometryScript must be a non-empty string.');
+    await expect(tools.renderCadQuery(null)).rejects.toThrow('GeometryScript must be a non-empty string.');
+    await expect(tools.renderCadQuery(42)).rejects.toThrow('GeometryScript must be a non-empty string.');
+  });
+});
+
+// ─── getEngineState ───────────────────────────────────────────────────────────
+
+describe('McpCadTools.getEngineState — Query (CQRS)', () => {
+  it('should return EngineState from CadEngineProcess.getDocumentState()', async () => {
+    const tools = setup();
+    const fakeState = { objects: [{ name: 'Box', type: 'Part::Feature' }] };
+    mockGetDocumentState.mockResolvedValue(fakeState);
+
+    const state = await tools.getEngineState();
+
+    expect(mockGetDocumentState).toHaveBeenCalledTimes(1);
+    expect(state).toEqual(fakeState);
+  });
+});
+
+// ─── getToolDefinitions ───────────────────────────────────────────────────────
+
+describe('McpCadTools.getToolDefinitions — Query (CQRS, static)', () => {
+  it('should return an array of tool definitions for Gemini', () => {
+    const defs = McpCadTools.getToolDefinitions();
+
+    expect(Array.isArray(defs)).toBe(true);
+    expect(defs.length).toBeGreaterThan(0);
+    defs.forEach((def) => {
+      expect(def).toHaveProperty('name');
+      expect(def).toHaveProperty('description');
+      expect(def).toHaveProperty('parameters');
+    });
+  });
+});
diff --git a/test/unit/McpServer.test.js b/test/unit/McpServer.test.js
new file mode 100644
index 0000000..d185e30
--- /dev/null
+++ b/test/unit/McpServer.test.js
@@ -0,0 +1,71 @@
+import { jest } from '@jest/globals';
+
+/**
+ * Unit tests for McpServer (src/infrastructure/mcp/McpServer.js)
+ *
+ * Traceability:
+ *   - Requirement: ddd_interfaces.md § IMcpServer
+ *   - Architecture: implementation_plan.md § [NEW] src/infrastructure/mcp/McpServer.js
+ *   - Protocol: DEVELOPER.md (TDD — RED phase)
+ */
+
+const mockConnect = jest.fn();
+const mockClose = jest.fn();
+const mockSetRequestHandler = jest.fn();
+
+jest.unstable_mockModule('@modelcontextprotocol/sdk/server/index.js', () => ({
+  Server: jest.fn().mockImplementation(() => ({
+    connect: mockConnect,
+    close: mockClose,
+    setRequestHandler: mockSetRequestHandler,
+  })),
+}));
+
+jest.unstable_mockModule('@modelcontextprotocol/sdk/server/stdio.js', () => ({
+  StdioServerTransport: jest.fn(),
+}));
+
+// We mock McpCadTools to avoid real IPC calls in this unit test
+jest.unstable_mockModule('../../src/infrastructure/ai/McpCadTools.js', () => ({
+  McpCadTools: {
+    getToolDefinitions: jest.fn().mockReturnValue([
+      { name: 'fake_tool', description: 'fake', parameters: {} },
+    ]),
+  },
+}));
+
+const { McpServerAdapter } = await import('../../src/infrastructure/mcp/McpServer.js');
+
+const setup = () => {
+  jest.clearAllMocks();
+  // Mock CadAgent dependencies
+  const mockToolsInstance = {
+    renderCadQuery: jest.fn().mockResolvedValue({ success: true }),
+    getEngineState: jest.fn().mockResolvedValue({ objects: [] }),
+  };
+  return new McpServerAdapter(mockToolsInstance);
+};
+
+describe('McpServerAdapter', () => {
+  it('should start the server and connect via stdio transport', async () => {
+    const adapter = setup();
+    mockConnect.mockResolvedValue();
+
+    await adapter.start();
+
+    // Verify MCP Server SDK methods were called
+    expect(mockConnect).toHaveBeenCalledTimes(1);
+    expect(mockSetRequestHandler).toHaveBeenCalled();
+  });
+
+  it('should stop the server by calling close() on the MCP SDK Server', async () => {
+    const adapter = setup();
+    mockConnect.mockResolvedValue();
+    mockClose.mockResolvedValue();
+
+    await adapter.start();
+    await adapter.stop();
+
+    expect(mockClose).toHaveBeenCalledTimes(1);
+  });
+});