Merge pull request #38 from wso2/pavinduLakshan-patch-4

* Add StreambleHTTP support

.github/scripts/release.sh

@@ -51,7 +51,7 @@ else
 fi
 
 # Extract current version.
-CURRENT_VERSION=$(git describe --tags --abbrev=0 2>/dev/null || echo "0.0.0")
+CURRENT_VERSION=$(git tag --sort=-v:refname | head -n 1 | sed 's/^v//' || echo "0.0.0")
 IFS='.' read -r MAJOR MINOR PATCH <<< "${CURRENT_VERSION}"
 
 # Determine which part to increment

.gitignore

@@ -36,3 +36,7 @@ coverage.html
 
 # IDE files
 .vscode
+
+# node modules
+node_modules
+openmcpauthproxy

Makefile

@@ -24,9 +24,9 @@ TEST_OPTS := -v -race
 .PHONY: all clean test fmt lint vet coverage help
 
 # Default target
-all: lint test build-linux build-linux-arm build-darwin
+all: lint test build-linux build-linux-arm build-darwin build-windows
 
-build: clean test build-linux build-linux-arm build-darwin
+build: clean test build-linux build-linux-arm build-darwin build-windows
 
 build-linux:
 	mkdir -p $(BUILD_DIR)/linux
@@ -46,6 +46,12 @@ build-darwin:
 	-o $(BUILD_DIR)/darwin/openmcpauthproxy $(PROJECT_ROOT)/cmd/proxy
 	cp config.yaml $(BUILD_DIR)/darwin
 
+build-windows:
+	mkdir -p $(BUILD_DIR)/windows
+	GOOS=windows GOARCH=amd64 CGO_ENABLED=0 go build -x -ldflags "-X main.version=$(BUILD_VERSION)" \
+	-o $(BUILD_DIR)/windows/openmcpauthproxy.exe ./cmd/proxy
+	cp config.yaml $(BUILD_DIR)/windows
+
 # Clean build artifacts
 clean:
 	@echo "Cleaning build artifacts..."

README.md

@@ -51,10 +51,16 @@ Open MCP Auth Proxy sits between MCP clients and your MCP server to:
 
 2. Start the proxy in demo mode (uses pre-configured authentication with Asgardeo sandbox):
 
+#### Linux/macOS:
 ```bash
 ./openmcpauthproxy --demo
 ```
 
+#### Windows:
+```powershell
+.\openmcpauthproxy.exe --demo
+```
+
 > The repository comes with a default `config.yaml` file that contains the basic configuration:
 > 
 > ```yaml
@@ -215,12 +221,102 @@ asgardeo:
   client_id: "<client_id>"
   client_secret: "<client_secret>"
 ```
+## Build from Source
 
-### Build from source
+### Prerequisites
+
+* Go 1.20 or higher
+* Git
+* Make (optional, for simplified builds)
+
+### Clone and Build
+
+1. **Clone the repository:**
+   ```bash
+   git clone https://github.com/wso2/open-mcp-auth-proxy
+   cd open-mcp-auth-proxy
+   ```
+
+2. **Install dependencies:**
+   ```bash
+   go get -v -t -d ./...
+   ```
+
+3. **Build the application:**
+
+   **Option A: Using Make**
+   ```bash
+   # Build for all platforms
+   make all
+   
+   # Or build for specific platforms
+   make build-linux      # For Linux (x86_64)
+   make build-linux-arm  # For ARM-based Linux
+   make build-darwin     # For macOS
+   make build-windows    # For Windows
+   ```
+
+   **Option B: Manual build (works on all platforms)**
+   ```bash
+   # Build for your current platform
+   go build -o openmcpauthproxy ./cmd/proxy
+   
+   # Cross-compile for other platforms
+   GOOS=linux GOARCH=amd64 go build -o openmcpauthproxy-linux ./cmd/proxy
+   GOOS=windows GOARCH=amd64 go build -o openmcpauthproxy.exe ./cmd/proxy
+   GOOS=darwin GOARCH=amd64 go build -o openmcpauthproxy-macos ./cmd/proxy
+   ```
+
+### Run the Built Application
+
+After building, you'll find the executables in the `build` directory (when using Make) or in your project root (when building manually).
+
+**Linux/macOS:**
+```bash
+# If built with Make
+./build/linux/openmcpauthproxy --demo
+
+# If built manually
+./openmcpauthproxy --demo
+```
+
+**Windows:**
+```powershell
+# If built with Make
+.\build\windows\openmcpauthproxy.exe --demo
+
+# If built manually
+.\openmcpauthproxy.exe --demo
+```
+
+### Available Command Line Options
 
 ```bash
-git clone https://github.com/wso2/open-mcp-auth-proxy
-cd open-mcp-auth-proxy
-go get github.com/golang-jwt/jwt/v4 gopkg.in/yaml.v2
-go build -o openmcpauthproxy ./cmd/proxy
+# Start in demo mode (using Asgardeo sandbox)
+./openmcpauthproxy --demo
+
+# Start with your own Asgardeo organization
+./openmcpauthproxy --asgardeo
+
+# Use stdio transport mode instead of SSE
+./openmcpauthproxy --demo --stdio
+
+# Enable debug logging
+./openmcpauthproxy --demo --debug
+
+# Show all available options
+./openmcpauthproxy --help
+```
+
+### Additional Make Targets
+
+If you're using Make, these additional targets are available:
+
+```bash
+make test       # Run tests
+make coverage   # Run tests with coverage report
+make fmt        # Format code with gofmt
+make vet        # Run go vet
+make clean      # Clean build artifacts
+make help       # Show all available targets
 ```

config.yaml

@@ -2,14 +2,15 @@
 
 # Common configuration for all transport modes
 listen_port: 8080
-base_url: "http://localhost:8000" # Base URL for the MCP server
-port: 8000 # Port for the MCP server
+base_url: "http://localhost:3001" # Base URL for the MCP server
+port: 3001 # Port for the MCP server
 timeout_seconds: 10
 
 # Path configuration
 paths:
   sse: "/sse" # SSE endpoint path
   messages: "/messages/" # Messages endpoint path
+  streamable_http: "/mcp" # MCP endpoint path
 
 # Transport mode configuration
 transport_mode: "sse" # Options: "sse" or "stdio"
@@ -28,7 +29,7 @@ path_mapping:
 # CORS configuration
 cors:
   allowed_origins:
-    - "http://localhost:5173"
+    - "http://127.0.0.1:6274"
   allowed_methods:
     - "GET"
     - "POST"

internal/authz/asgardeo.go

@@ -113,6 +113,7 @@ func (p *asgardeoProvider) RegisterHandler() http.HandlerFunc {
 
 		if err := p.createAsgardeoApplication(regReq); err != nil {
 			logger.Warn("Asgardeo application creation failed: %v", err)
+			http.Error(w, "Failed to create application in Asgardeo", http.StatusInternalServerError)
 			// Optionally http.Error(...) if you want to fail
 			// or continue to return partial data.
 		}
@@ -269,6 +270,18 @@ func buildAsgardeoPayload(regReq RegisterRequest) map[string]interface{} {
 	}
 	appName += "-" + randomString(5)
 
+	// Build redirect URIs regex from list of redirect URIs : regexp=(https://app.example.com/callback1|https://app.example.com/callback2)
+	redirectURI := "regexp=(" + strings.Join(regReq.RedirectURIs, "|") + ")"
+	redirectURIs := []string{redirectURI}
+
+	// Filter unsupported grant types
+	var grantTypes []string
+	for _, gt := range regReq.GrantTypes {
+		if gt == "authorization_code" || gt == "refresh_token" {
+			grantTypes = append(grantTypes, gt)
+		}
+	}
+
 	return map[string]interface{}{
 		"name":       appName,
 		"templateId": "custom-application-oidc",
@@ -276,10 +289,10 @@ func buildAsgardeoPayload(regReq RegisterRequest) map[string]interface{} {
 			"oidc": map[string]interface{}{
 				"clientId":       regReq.ClientID,
 				"clientSecret":   regReq.ClientSecret,
-				"grantTypes":     regReq.GrantTypes,
-				"callbackURLs":   regReq.RedirectURIs,
+				"grantTypes":     grantTypes,
+				"callbackURLs":   redirectURIs,
 				"allowedOrigins": []string{},
-				"publicClient":   false,
+				"publicClient":   true,
 				"pkce": map[string]bool{
 					"mandatory":                      true,
 					"supportPlainTransformAlgorithm": true,

internal/config/config.go

@@ -3,6 +3,8 @@ package config
 import (
 	"fmt"
 	"os"
+	"runtime"
+	"strings"
 
 	"gopkg.in/yaml.v2"
 )
@@ -17,15 +19,16 @@ const (
 
 // Common path configuration for all transport modes
 type PathsConfig struct {
-	SSE       string `yaml:"sse"`
-	Messages  string `yaml:"messages"`
+	SSE            string `yaml:"sse"`
+	Messages       string `yaml:"messages"`
+	StreamableHTTP string `yaml:"streamable_http"` // Path for streamable HTTP requests
 }
 
 // StdioConfig contains stdio-specific configuration
 type StdioConfig struct {
 	Enabled     bool     `yaml:"enabled"`
-	UserCommand string   `yaml:"user_command"` // The command provided by the user
-	WorkDir     string   `yaml:"work_dir"`     // Working directory (optional)
+	UserCommand string   `yaml:"user_command"`   // The command provided by the user
+	WorkDir     string   `yaml:"work_dir"`       // Working directory (optional)
 	Args        []string `yaml:"args,omitempty"` // Additional arguments
 	Env         []string `yaml:"env,omitempty"`  // Environment variables
 }
@@ -83,18 +86,18 @@ type DefaultConfig struct {
 }
 
 type Config struct {
-	AuthServerBaseURL  string
-	ListenPort         int           `yaml:"listen_port"`
-	BaseURL            string        `yaml:"base_url"`
-	Port               int           `yaml:"port"`
-	JWKSURL            string
-	TimeoutSeconds     int               `yaml:"timeout_seconds"`
-	PathMapping        map[string]string `yaml:"path_mapping"`
-	Mode               string            `yaml:"mode"`
-	CORSConfig         CORSConfig        `yaml:"cors"`
-	TransportMode      TransportMode     `yaml:"transport_mode"`
-	Paths              PathsConfig       `yaml:"paths"`
-	Stdio              StdioConfig       `yaml:"stdio"`
+	AuthServerBaseURL string
+	ListenPort        int    `yaml:"listen_port"`
+	BaseURL           string `yaml:"base_url"`
+	Port              int    `yaml:"port"`
+	JWKSURL           string
+	TimeoutSeconds    int               `yaml:"timeout_seconds"`
+	PathMapping       map[string]string `yaml:"path_mapping"`
+	Mode              string            `yaml:"mode"`
+	CORSConfig        CORSConfig        `yaml:"cors"`
+	TransportMode     TransportMode     `yaml:"transport_mode"`
+	Paths             PathsConfig       `yaml:"paths"`
+	Stdio             StdioConfig       `yaml:"stdio"`
 
 	// Nested config for Asgardeo
 	Demo     DemoConfig     `yaml:"demo"`
@@ -136,7 +139,7 @@ func (c *Config) Validate() error {
 
 // GetMCPPaths returns the list of paths that should be proxied to the MCP server
 func (c *Config) GetMCPPaths() []string {
-	return []string{c.Paths.SSE, c.Paths.Messages}
+	return []string{c.Paths.SSE, c.Paths.Messages, c.Paths.StreamableHTTP}
 }
 
 // BuildExecCommand constructs the full command string for execution in stdio mode
@@ -145,7 +148,15 @@ func (c *Config) BuildExecCommand() string {
 		return ""
 	}
 
-	// Construct the full command
+	if runtime.GOOS == "windows" {
+		// For Windows, we need to properly escape the inner command
+		escapedCommand := strings.ReplaceAll(c.Stdio.UserCommand, `"`, `\"`)
+		return fmt.Sprintf(
+			`npx -y supergateway --stdio "%s" --port %d --baseUrl %s --ssePath %s --messagePath %s`,
+			escapedCommand, c.Port, c.BaseURL, c.Paths.SSE, c.Paths.Messages,
+		)
+	}
+
 	return fmt.Sprintf(
 		`npx -y supergateway --stdio "%s" --port %d --baseUrl %s --ssePath %s --messagePath %s`,
 		c.Stdio.UserCommand, c.Port, c.BaseURL, c.Paths.SSE, c.Paths.Messages,
@@ -165,12 +176,12 @@ func LoadConfig(path string) (*Config, error) {
 	if err := decoder.Decode(&cfg); err != nil {
 		return nil, err
 	}
-	
+
 	// Set default values
 	if cfg.TimeoutSeconds == 0 {
 		cfg.TimeoutSeconds = 15 // default
 	}
-	
+
 	// Set default transport mode if not specified
 	if cfg.TransportMode == "" {
 		cfg.TransportMode = SSETransport // Default to SSE
@@ -180,11 +191,11 @@ func LoadConfig(path string) (*Config, error) {
 	if cfg.Port == 0 {
 		cfg.Port = 8000 // default
 	}
-	
+
 	// Validate the configuration
 	if err := cfg.Validate(); err != nil {
 		return nil, err
 	}
-	
+
 	return &cfg, nil
 }

internal/config/config_test.go

@@ -136,20 +136,15 @@ func TestValidate(t *testing.T) {
 func TestGetMCPPaths(t *testing.T) {
 	cfg := Config{
 		Paths: PathsConfig{
-			SSE:      "/custom-sse",
-			Messages: "/custom-messages",
+			SSE:            "/custom-sse",
+			Messages:       "/custom-messages",
+			StreamableHTTP: "/custom-streamable",
 		},
 	}
 
 	paths := cfg.GetMCPPaths()
-	if len(paths) != 2 {
-		t.Errorf("Expected 2 MCP paths, got %d", len(paths))
-	}
-	if paths[0] != "/custom-sse" {
-		t.Errorf("Expected first path=/custom-sse, got %s", paths[0])
-	}
-	if paths[1] != "/custom-messages" {
-		t.Errorf("Expected second path=/custom-messages, got %s", paths[1])
+	if len(paths) != 3 {
+		t.Errorf("Expected 3 MCP paths, got %d", len(paths))
 	}
 }
 

internal/proxy/proxy.go

@@ -10,7 +10,7 @@ import (
 
 	"github.com/wso2/open-mcp-auth-proxy/internal/authz"
 	"github.com/wso2/open-mcp-auth-proxy/internal/config"
-	"github.com/wso2/open-mcp-auth-proxy/internal/logging"
+	logger "github.com/wso2/open-mcp-auth-proxy/internal/logging"
 	"github.com/wso2/open-mcp-auth-proxy/internal/util"
 )
 
@@ -106,7 +106,7 @@ func buildProxyHandler(cfg *config.Config, modifiers map[string]RequestModifier)
 		logger.Error("Invalid auth server URL: %v", err)
 		panic(err) // Fatal error that prevents startup
 	}
-	
+
 	mcpBase, err := url.Parse(cfg.BaseURL)
 	if err != nil {
 		logger.Error("Invalid MCP server URL: %v", err)
@@ -191,13 +191,13 @@ func buildProxyHandler(cfg *config.Config, modifiers map[string]RequestModifier)
 				req.Host = targetURL.Host
 
 				cleanHeaders := http.Header{}
-				
+
 				// Set proper origin header to match the target
 				if isSSE {
 					// For SSE, ensure origin matches the target
 					req.Header.Set("Origin", targetURL.Scheme+"://"+targetURL.Host)
 				}
-				
+
 				for k, v := range r.Header {
 					// Skip hop-by-hop headers
 					if skipHeader(k) {
@@ -231,12 +231,12 @@ func buildProxyHandler(cfg *config.Config, modifiers map[string]RequestModifier)
 				proxyHost:  r.Host,
 				targetHost: targetURL.Host,
 			}
-			
+
 			// Set SSE-specific headers
 			w.Header().Set("X-Accel-Buffering", "no")
 			w.Header().Set("Cache-Control", "no-cache")
 			w.Header().Set("Connection", "keep-alive")
-			
+
 			// Keep SSE connections open
 			HandleSSE(w, r, rp)
 		} else {

internal/subprocess/manager.go

@@ -4,13 +4,14 @@ import (
 	"fmt"
 	"os"
 	"os/exec"
+	"runtime"
+	"strings"
 	"sync"
 	"syscall"
 	"time"
-	"strings"
 
 	"github.com/wso2/open-mcp-auth-proxy/internal/config"
-	"github.com/wso2/open-mcp-auth-proxy/internal/logging"
+	logger "github.com/wso2/open-mcp-auth-proxy/internal/logging"
 )
 
 // Manager handles starting and graceful shutdown of subprocesses
@@ -31,34 +32,39 @@ func NewManager() *Manager {
 
 // EnsureDependenciesAvailable checks and installs required package executors
 func EnsureDependenciesAvailable(command string) error {
-    // Always ensure npx is available regardless of the command
-    if _, err := exec.LookPath("npx"); err != nil {
-        // npx is not available, check if npm is installed
-        if _, err := exec.LookPath("npm"); err != nil {
-            return fmt.Errorf("npx not found and npm not available; please install Node.js from https://nodejs.org/")
-        }
-        
-        // Try to install npx using npm
-        logger.Info("npx not found, attempting to install...")
-        cmd := exec.Command("npm", "install", "-g", "npx")
-        cmd.Stdout = os.Stdout
-        cmd.Stderr = os.Stderr
-        
-        if err := cmd.Run(); err != nil {
-            return fmt.Errorf("failed to install npx: %w", err)
-        }
-        
-        logger.Info("npx installed successfully")
-    }
-    
-    // Check if uv is needed based on the command
-    if strings.Contains(command, "uv ") {
-        if _, err := exec.LookPath("uv"); err != nil {
-            return fmt.Errorf("command requires uv but it's not installed; please install it following instructions at https://github.com/astral-sh/uv")
-        }
-    }
-    
-    return nil
+	// Always ensure npx is available regardless of the command
+	if _, err := exec.LookPath("npx"); err != nil {
+		// npx is not available, check if npm is installed
+		if _, err := exec.LookPath("npm"); err != nil {
+			return fmt.Errorf("npx not found and npm not available; please install Node.js from https://nodejs.org/")
+		}
+
+		// Try to install npx using npm
+		logger.Info("npx not found, attempting to install...")
+		var cmd *exec.Cmd
+		if runtime.GOOS == "windows" {
+			cmd = exec.Command("npm.cmd", "install", "-g", "npx")
+		} else {
+			cmd = exec.Command("npm", "install", "-g", "npx")
+		}
+		cmd.Stdout = os.Stdout
+		cmd.Stderr = os.Stderr
+
+		if err := cmd.Run(); err != nil {
+			return fmt.Errorf("failed to install npx: %w", err)
+		}
+
+		logger.Info("npx installed successfully")
+	}
+
+	// Check if uv is needed based on the command
+	if strings.Contains(command, "uv ") {
+		if _, err := exec.LookPath("uv"); err != nil {
+			return fmt.Errorf("command requires uv but it's not installed; please install it following instructions at https://github.com/astral-sh/uv")
+		}
+	}
+
+	return nil
 }
 
 // SetShutdownDelay sets the maximum time to wait for graceful shutdown
@@ -88,8 +94,13 @@ func (m *Manager) Start(cfg *config.Config) error {
 
 	logger.Info("Starting subprocess with command: %s", execCommand)
 
-	// Use the shell to execute the command
-	cmd := exec.Command("sh", "-c", execCommand)
+	var cmd *exec.Cmd
+	if runtime.GOOS == "windows" {
+		// Use PowerShell on Windows for better quote handling
+		cmd = exec.Command("powershell", "-Command", execCommand)
+	} else {
+		cmd = exec.Command("sh", "-c", execCommand)
+	}
 
 	// Set working directory if specified
 	if cfg.Stdio.WorkDir != "" {
@@ -105,8 +116,8 @@ func (m *Manager) Start(cfg *config.Config) error {
 	cmd.Stdout = os.Stdout
 	cmd.Stderr = os.Stderr
 
-	// Set the process group for proper termination
-	cmd.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}
+	// Set platform-specific process attributes
+	setProcAttr(cmd)
 
 	// Start the process
 	if err := cmd.Start(); err != nil {
@@ -117,11 +128,13 @@ func (m *Manager) Start(cfg *config.Config) error {
 	m.cmd = cmd
 	logger.Info("Subprocess started with PID: %d", m.process.Pid)
 
-	// Get and store the process group ID
-	pgid, err := syscall.Getpgid(m.process.Pid)
+	// Get and store the process group ID (Unix) or PID (Windows)
+	pgid, err := getProcessGroup(m.process.Pid)
 	if err == nil {
 		m.processGroup = pgid
-		logger.Debug("Process group ID: %d", m.processGroup)
+		if runtime.GOOS != "windows" {
+			logger.Debug("Process group ID: %d", m.processGroup)
+		}
 	} else {
 		logger.Warn("Failed to get process group ID: %v", err)
 		m.processGroup = m.process.Pid
@@ -155,7 +168,7 @@ func (m *Manager) IsRunning() bool {
 // Shutdown gracefully terminates the subprocess
 func (m *Manager) Shutdown() {
 	m.mutex.Lock()
-	processToTerminate := m.process           // Local copy of the process reference
+	processToTerminate := m.process // Local copy of the process reference
 	processGroupToTerminate := m.processGroup
 	m.mutex.Unlock()
 
@@ -169,48 +182,73 @@ func (m *Manager) Shutdown() {
 	go func() {
 		defer close(terminateComplete)
 
-		// Try graceful termination first with SIGTERM
+		// Try graceful termination first
 		terminatedGracefully := false
 
-		// Try to terminate the process group first
-		if processGroupToTerminate != 0 {
-			err := syscall.Kill(-processGroupToTerminate, syscall.SIGTERM)
-			if err != nil {
-				logger.Warn("Failed to send SIGTERM to process group: %v", err)
+		if runtime.GOOS == "windows" {
+			// Windows: Try to terminate the process
+			m.mutex.Lock()
+			if m.process != nil {
+				err := m.process.Kill()
+				if err != nil {
+					logger.Warn("Failed to terminate process: %v", err)
+				}
+			}
+			m.mutex.Unlock()
 
-				// Fallback to terminating just the process
+			// Wait a bit to see if it terminates
+			for i := 0; i < 10; i++ {
+				time.Sleep(200 * time.Millisecond)
+				m.mutex.Lock()
+				if m.process == nil {
+					terminatedGracefully = true
+					m.mutex.Unlock()
+					break
+				}
+				m.mutex.Unlock()
+			}
+		} else {
+			// Unix: Use SIGTERM followed by SIGKILL if necessary
+			// Try to terminate the process group first
+			if processGroupToTerminate != 0 {
+				err := killProcessGroup(processGroupToTerminate, syscall.SIGTERM)
+				if err != nil {
+					logger.Warn("Failed to send SIGTERM to process group: %v", err)
+
+					// Fallback to terminating just the process
+					m.mutex.Lock()
+					if m.process != nil {
+						err = m.process.Signal(syscall.SIGTERM)
+						if err != nil {
+							logger.Warn("Failed to send SIGTERM to process: %v", err)
+						}
+					}
+					m.mutex.Unlock()
+				}
+			} else {
+				// Try to terminate just the process
 				m.mutex.Lock()
 				if m.process != nil {
-					err = m.process.Signal(syscall.SIGTERM)
+					err := m.process.Signal(syscall.SIGTERM)
 					if err != nil {
 						logger.Warn("Failed to send SIGTERM to process: %v", err)
 					}
 				}
 				m.mutex.Unlock()
 			}
-		} else {
-			// Try to terminate just the process
-			m.mutex.Lock()
-			if m.process != nil {
-				err := m.process.Signal(syscall.SIGTERM)
-				if err != nil {
-					logger.Warn("Failed to send SIGTERM to process: %v", err)
+
+			// Wait for the process to exit gracefully
+			for i := 0; i < 10; i++ {
+				time.Sleep(200 * time.Millisecond)
+
+				m.mutex.Lock()
+				if m.process == nil {
+					terminatedGracefully = true
+					m.mutex.Unlock()
+					break
 				}
-			}
-			m.mutex.Unlock()
-		}
-
-		// Wait for the process to exit gracefully
-		for i := 0; i < 10; i++ {
-			time.Sleep(200 * time.Millisecond)
-
-			m.mutex.Lock()
-			if m.process == nil {
-				terminatedGracefully = true
 				m.mutex.Unlock()
-				break
 			}
-			m.mutex.Unlock()
 		}
 
 		if terminatedGracefully {
@@ -221,12 +259,33 @@ func (m *Manager) Shutdown() {
 		// If the process didn't exit gracefully, force kill
 		logger.Warn("Subprocess didn't exit gracefully, forcing termination...")
 
-		// Try to kill the process group first
-		if processGroupToTerminate != 0 {
-			if err := syscall.Kill(-processGroupToTerminate, syscall.SIGKILL); err != nil {
-				logger.Warn("Failed to send SIGKILL to process group: %v", err)
+		if runtime.GOOS == "windows" {
+			// On Windows, Kill() is already forceful
+			m.mutex.Lock()
+			if m.process != nil {
+				if err := m.process.Kill(); err != nil {
+					logger.Error("Failed to kill process: %v", err)
+				}
+			}
+			m.mutex.Unlock()
+		} else {
+			// Unix: Try SIGKILL
+			// Try to kill the process group first
+			if processGroupToTerminate != 0 {
+				if err := killProcessGroup(processGroupToTerminate, syscall.SIGKILL); err != nil {
+					logger.Warn("Failed to send SIGKILL to process group: %v", err)
 
-				// Fallback to killing just the process
+					// Fallback to killing just the process
+					m.mutex.Lock()
+					if m.process != nil {
+						if err := m.process.Kill(); err != nil {
+							logger.Error("Failed to kill process: %v", err)
+						}
+					}
+					m.mutex.Unlock()
+				}
+			} else {
+				// Try to kill just the process
 				m.mutex.Lock()
 				if m.process != nil {
 					if err := m.process.Kill(); err != nil {
@@ -235,15 +294,6 @@ func (m *Manager) Shutdown() {
 				}
 				m.mutex.Unlock()
 			}
-		} else {
-			// Try to kill just the process
-			m.mutex.Lock()
-			if m.process != nil {
-				if err := m.process.Kill(); err != nil {
-					logger.Error("Failed to kill process: %v", err)
-				}
-			}
-			m.mutex.Unlock()
 		}
 
 		// Wait a bit more to confirm termination

internal/subprocess/manager_unix.go

@@ -0,0 +1,23 @@
+//go:build !windows
+
+package subprocess
+
+import (
+	"os/exec"
+	"syscall"
+)
+
+// setProcAttr sets Unix-specific process attributes
+func setProcAttr(cmd *exec.Cmd) {
+	cmd.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}
+}
+
+// getProcessGroup gets the process group ID on Unix systems
+func getProcessGroup(pid int) (int, error) {
+	return syscall.Getpgid(pid)
+}
+
+// killProcessGroup kills a process group on Unix systems
+func killProcessGroup(pgid int, signal syscall.Signal) error {
+	return syscall.Kill(-pgid, signal)
+}

internal/subprocess/manager_windows.go

@@ -0,0 +1,27 @@
+//go:build windows
+
+package subprocess
+
+import (
+	"os/exec"
+	"syscall"
+)
+
+// setProcAttr sets Windows-specific process attributes
+func setProcAttr(cmd *exec.Cmd) {
+	cmd.SysProcAttr = &syscall.SysProcAttr{
+		CreationFlags: syscall.CREATE_NEW_PROCESS_GROUP,
+	}
+}
+
+// getProcessGroup returns the PID itself on Windows (no process groups)
+func getProcessGroup(pid int) (int, error) {
+	return pid, nil
+}
+
+// killProcessGroup kills a process on Windows (no process groups)
+func killProcessGroup(pgid int, signal syscall.Signal) error {
+	// On Windows, we'll use the process handle directly
+	// This function shouldn't be called on Windows, but we provide it for compatibility
+	return nil
+}