feat(antigravity): add FetchAntigravityProjectID function and integrate project ID retrieval

feat(antigravity): implement project ID retrieval and integration in payload processing

internal/api/handlers/management/auth_files.go

@@ -1472,6 +1472,17 @@ func (h *Handler) RequestAntigravityToken(c *gin.Context) {
 			}
 		}
 
+		projectID := ""
+		if strings.TrimSpace(tokenResp.AccessToken) != "" {
+			fetchedProjectID, errProject := sdkAuth.FetchAntigravityProjectID(ctx, tokenResp.AccessToken, httpClient)
+			if errProject != nil {
+				log.Warnf("antigravity: failed to fetch project ID: %v", errProject)
+			} else {
+				projectID = fetchedProjectID
+				log.Infof("antigravity: obtained project ID %s", projectID)
+			}
+		}
+
 		now := time.Now()
 		metadata := map[string]any{
 			"type":          "antigravity",
@@ -1484,6 +1495,9 @@ func (h *Handler) RequestAntigravityToken(c *gin.Context) {
 		if email != "" {
 			metadata["email"] = email
 		}
+		if projectID != "" {
+			metadata["project_id"] = projectID
+		}
 
 		fileName := sanitizeAntigravityFileName(email)
 		label := strings.TrimSpace(email)
@@ -1507,6 +1521,9 @@ func (h *Handler) RequestAntigravityToken(c *gin.Context) {
 
 		delete(oauthStatus, state)
 		fmt.Printf("Authentication successful! Token saved to %s\n", savedPath)
+		if projectID != "" {
+			fmt.Printf("Using GCP project: %s\n", projectID)
+		}
 		fmt.Println("You can now use Antigravity services through this CLI")
 	}()
 

internal/api/handlers/management/config_basic.go

@@ -1,16 +1,28 @@
 package management
 
 import (
+	"encoding/json"
+	"fmt"
 	"io"
 	"net/http"
 	"os"
 	"path/filepath"
+	"strings"
+	"time"
 
 	"github.com/gin-gonic/gin"
 	"github.com/router-for-me/CLIProxyAPI/v6/internal/config"
+	"github.com/router-for-me/CLIProxyAPI/v6/internal/util"
+	sdkconfig "github.com/router-for-me/CLIProxyAPI/v6/sdk/config"
+	log "github.com/sirupsen/logrus"
 	"gopkg.in/yaml.v3"
 )
 
+const (
+	latestReleaseURL       = "https://api.github.com/repos/router-for-me/CLIProxyAPI/releases/latest"
+	latestReleaseUserAgent = "CLIProxyAPI"
+)
+
 func (h *Handler) GetConfig(c *gin.Context) {
 	if h == nil || h.cfg == nil {
 		c.JSON(200, gin.H{})
@@ -20,6 +32,66 @@ func (h *Handler) GetConfig(c *gin.Context) {
 	c.JSON(200, &cfgCopy)
 }
 
+type releaseInfo struct {
+	TagName string `json:"tag_name"`
+	Name    string `json:"name"`
+}
+
+// GetLatestVersion returns the latest release version from GitHub without downloading assets.
+func (h *Handler) GetLatestVersion(c *gin.Context) {
+	client := &http.Client{Timeout: 10 * time.Second}
+	proxyURL := ""
+	if h != nil && h.cfg != nil {
+		proxyURL = strings.TrimSpace(h.cfg.ProxyURL)
+	}
+	if proxyURL != "" {
+		sdkCfg := &sdkconfig.SDKConfig{ProxyURL: proxyURL}
+		util.SetProxy(sdkCfg, client)
+	}
+
+	req, err := http.NewRequestWithContext(c.Request.Context(), http.MethodGet, latestReleaseURL, nil)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "request_create_failed", "message": err.Error()})
+		return
+	}
+	req.Header.Set("Accept", "application/vnd.github+json")
+	req.Header.Set("User-Agent", latestReleaseUserAgent)
+
+	resp, err := client.Do(req)
+	if err != nil {
+		c.JSON(http.StatusBadGateway, gin.H{"error": "request_failed", "message": err.Error()})
+		return
+	}
+	defer func() {
+		if errClose := resp.Body.Close(); errClose != nil {
+			log.WithError(errClose).Debug("failed to close latest version response body")
+		}
+	}()
+
+	if resp.StatusCode != http.StatusOK {
+		body, _ := io.ReadAll(io.LimitReader(resp.Body, 1024))
+		c.JSON(http.StatusBadGateway, gin.H{"error": "unexpected_status", "message": fmt.Sprintf("status %d: %s", resp.StatusCode, strings.TrimSpace(string(body)))})
+		return
+	}
+
+	var info releaseInfo
+	if errDecode := json.NewDecoder(resp.Body).Decode(&info); errDecode != nil {
+		c.JSON(http.StatusBadGateway, gin.H{"error": "decode_failed", "message": errDecode.Error()})
+		return
+	}
+
+	version := strings.TrimSpace(info.TagName)
+	if version == "" {
+		version = strings.TrimSpace(info.Name)
+	}
+	if version == "" {
+		c.JSON(http.StatusBadGateway, gin.H{"error": "invalid_response", "message": "missing release version"})
+		return
+	}
+
+	c.JSON(http.StatusOK, gin.H{"latest-version": version})
+}
+
 func WriteConfig(path string, data []byte) error {
 	data = config.NormalizeCommentIndentation(data)
 	f, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)

internal/api/middleware/request_logging.go

@@ -112,5 +112,10 @@ func shouldLogRequest(path string) bool {
 	if strings.HasPrefix(path, "/v0/management") || strings.HasPrefix(path, "/management") {
 		return false
 	}
+
+	if strings.HasPrefix(path, "/api") {
+		return strings.HasPrefix(path, "/api/provider")
+	}
+
 	return true
 }

internal/api/modules/amp/amp.go

@@ -27,11 +27,20 @@ type Option func(*AmpModule)
 type AmpModule struct {
 	secretSource    SecretSource
 	proxy           *httputil.ReverseProxy
+	proxyMu         sync.RWMutex // protects proxy for hot-reload
 	accessManager   *sdkaccess.Manager
 	authMiddleware_ gin.HandlerFunc
 	modelMapper     *DefaultModelMapper
 	enabled         bool
 	registerOnce    sync.Once
+
+	// restrictToLocalhost controls localhost-only access for management routes (hot-reloadable)
+	restrictToLocalhost bool
+	restrictMu          sync.RWMutex
+
+	// configMu protects lastConfig for partial reload comparison
+	configMu   sync.RWMutex
+	lastConfig *config.AmpCode
 }
 
 // New creates a new Amp routing module with the given options.
@@ -107,9 +116,19 @@ func (m *AmpModule) Register(ctx modules.Context) error {
 		// Initialize model mapper from config (for routing unavailable models to alternatives)
 		m.modelMapper = NewModelMapper(settings.ModelMappings)
 
+		// Store initial config for partial reload comparison
+		settingsCopy := settings
+		m.lastConfig = &settingsCopy
+
+		// Initialize localhost restriction setting (hot-reloadable)
+		m.setRestrictToLocalhost(settings.RestrictManagementToLocalhost)
+
 		// Always register provider aliases - these work without an upstream
 		m.registerProviderAliases(ctx.Engine, ctx.BaseHandler, auth)
 
+		// Register management proxy routes once; middleware will gate access when upstream is unavailable.
+		m.registerManagementRoutes(ctx.Engine, ctx.BaseHandler)
+
 		// If no upstream URL, skip proxy routes but provider aliases are still available
 		if upstreamURL == "" {
 			log.Debug("amp upstream proxy disabled (no upstream URL configured)")
@@ -118,28 +137,11 @@ func (m *AmpModule) Register(ctx modules.Context) error {
 			return
 		}
 
-		// Create secret source with precedence: config > env > file
-		// Cache secrets for 5 minutes to reduce file I/O
-		if m.secretSource == nil {
-			m.secretSource = NewMultiSourceSecret(settings.UpstreamAPIKey, 0 /* default 5min */)
-		}
-
-		// Create reverse proxy with gzip handling via ModifyResponse
-		proxy, err := createReverseProxy(upstreamURL, m.secretSource)
-		if err != nil {
+		if err := m.enableUpstreamProxy(upstreamURL, &settings); err != nil {
 			regErr = fmt.Errorf("failed to create amp proxy: %w", err)
 			return
 		}
 
-		m.proxy = proxy
-		m.enabled = true
-
-		// Register management proxy routes (requires upstream)
-		// Restrict to localhost by default for security (prevents drive-by browser attacks)
-		handler := proxyHandler(proxy)
-		m.registerManagementRoutes(ctx.Engine, ctx.BaseHandler, handler, settings.RestrictManagementToLocalhost)
-
-		log.Infof("amp upstream proxy enabled for: %s", upstreamURL)
 		log.Debug("amp provider alias routes registered")
 	})
 
@@ -162,44 +164,169 @@ func (m *AmpModule) getAuthMiddleware(ctx modules.Context) gin.HandlerFunc {
 	}
 }
 
-// OnConfigUpdated handles configuration updates.
-// Currently requires restart for URL changes (could be enhanced for dynamic updates).
+// OnConfigUpdated handles configuration updates with partial reload support.
+// Only updates components that have actually changed to avoid unnecessary work.
+// Supports hot-reload for: model-mappings, upstream-api-key, upstream-url, restrict-management-to-localhost.
 func (m *AmpModule) OnConfigUpdated(cfg *config.Config) error {
-	settings := cfg.AmpCode
+	newSettings := cfg.AmpCode
 
-	// Update model mappings (hot-reload supported)
-	if m.modelMapper != nil {
-		m.modelMapper.UpdateMappings(settings.ModelMappings)
-		if m.enabled {
-			log.Infof("amp config updated: reloading %d model mapping(s)", len(settings.ModelMappings))
-		}
-	} else if m.enabled {
-		log.Warnf("amp model mapper not initialized, skipping model mapping update")
-	}
+	// Get previous config for comparison
+	m.configMu.RLock()
+	oldSettings := m.lastConfig
+	m.configMu.RUnlock()
 
-	if !m.enabled {
-		return nil
-	}
-
-	upstreamURL := strings.TrimSpace(settings.UpstreamURL)
-	if upstreamURL == "" {
-		log.Warn("amp upstream URL removed from config, restart required to disable")
-		return nil
-	}
-
-	// If API key changed, invalidate the cache
-	if m.secretSource != nil {
-		if ms, ok := m.secretSource.(*MultiSourceSecret); ok {
-			ms.InvalidateCache()
-			log.Debug("amp secret cache invalidated due to config update")
+	if oldSettings != nil && oldSettings.RestrictManagementToLocalhost != newSettings.RestrictManagementToLocalhost {
+		m.setRestrictToLocalhost(newSettings.RestrictManagementToLocalhost)
+		if !newSettings.RestrictManagementToLocalhost {
+			log.Warnf("amp management routes now accessible from any IP - this is insecure!")
 		}
 	}
 
-	log.Debug("amp config updated (restart required for URL changes)")
+	newUpstreamURL := strings.TrimSpace(newSettings.UpstreamURL)
+	oldUpstreamURL := ""
+	if oldSettings != nil {
+		oldUpstreamURL = strings.TrimSpace(oldSettings.UpstreamURL)
+	}
+
+	if !m.enabled && newUpstreamURL != "" {
+		if err := m.enableUpstreamProxy(newUpstreamURL, &newSettings); err != nil {
+			log.Errorf("amp config: failed to enable upstream proxy for %s: %v", newUpstreamURL, err)
+		}
+	}
+
+	// Check model mappings change
+	modelMappingsChanged := m.hasModelMappingsChanged(oldSettings, &newSettings)
+	if modelMappingsChanged {
+		if m.modelMapper != nil {
+			m.modelMapper.UpdateMappings(newSettings.ModelMappings)
+		} else if m.enabled {
+			log.Warnf("amp model mapper not initialized, skipping model mapping update")
+		}
+	}
+
+	if m.enabled {
+		// Check upstream URL change - now supports hot-reload
+		if newUpstreamURL == "" && oldUpstreamURL != "" {
+			m.setProxy(nil)
+			m.enabled = false
+		} else if oldUpstreamURL != "" && newUpstreamURL != oldUpstreamURL && newUpstreamURL != "" {
+			// Recreate proxy with new URL
+			proxy, err := createReverseProxy(newUpstreamURL, m.secretSource)
+			if err != nil {
+				log.Errorf("amp config: failed to create proxy for new upstream URL %s: %v", newUpstreamURL, err)
+			} else {
+				m.setProxy(proxy)
+			}
+		}
+
+		// Check API key change
+		apiKeyChanged := m.hasAPIKeyChanged(oldSettings, &newSettings)
+		if apiKeyChanged {
+			if m.secretSource != nil {
+				if ms, ok := m.secretSource.(*MultiSourceSecret); ok {
+					ms.UpdateExplicitKey(newSettings.UpstreamAPIKey)
+					ms.InvalidateCache()
+				}
+			}
+		}
+
+	}
+
+	// Store current config for next comparison
+	m.configMu.Lock()
+	settingsCopy := newSettings // copy struct
+	m.lastConfig = &settingsCopy
+	m.configMu.Unlock()
+
 	return nil
 }
 
+func (m *AmpModule) enableUpstreamProxy(upstreamURL string, settings *config.AmpCode) error {
+	if m.secretSource == nil {
+		m.secretSource = NewMultiSourceSecret(settings.UpstreamAPIKey, 0 /* default 5min */)
+	} else if ms, ok := m.secretSource.(*MultiSourceSecret); ok {
+		ms.UpdateExplicitKey(settings.UpstreamAPIKey)
+		ms.InvalidateCache()
+	}
+
+	proxy, err := createReverseProxy(upstreamURL, m.secretSource)
+	if err != nil {
+		return err
+	}
+
+	m.setProxy(proxy)
+	m.enabled = true
+
+	log.Infof("amp upstream proxy enabled for: %s", upstreamURL)
+	return nil
+}
+
+// hasModelMappingsChanged compares old and new model mappings.
+func (m *AmpModule) hasModelMappingsChanged(old *config.AmpCode, new *config.AmpCode) bool {
+	if old == nil {
+		return len(new.ModelMappings) > 0
+	}
+
+	if len(old.ModelMappings) != len(new.ModelMappings) {
+		return true
+	}
+
+	// Build map for efficient comparison
+	oldMap := make(map[string]string, len(old.ModelMappings))
+	for _, mapping := range old.ModelMappings {
+		oldMap[strings.TrimSpace(mapping.From)] = strings.TrimSpace(mapping.To)
+	}
+
+	for _, mapping := range new.ModelMappings {
+		from := strings.TrimSpace(mapping.From)
+		to := strings.TrimSpace(mapping.To)
+		if oldTo, exists := oldMap[from]; !exists || oldTo != to {
+			return true
+		}
+	}
+
+	return false
+}
+
+// hasAPIKeyChanged compares old and new API keys.
+func (m *AmpModule) hasAPIKeyChanged(old *config.AmpCode, new *config.AmpCode) bool {
+	oldKey := ""
+	if old != nil {
+		oldKey = strings.TrimSpace(old.UpstreamAPIKey)
+	}
+	newKey := strings.TrimSpace(new.UpstreamAPIKey)
+	return oldKey != newKey
+}
+
 // GetModelMapper returns the model mapper instance (for testing/debugging).
 func (m *AmpModule) GetModelMapper() *DefaultModelMapper {
 	return m.modelMapper
 }
+
+// getProxy returns the current proxy instance (thread-safe for hot-reload).
+func (m *AmpModule) getProxy() *httputil.ReverseProxy {
+	m.proxyMu.RLock()
+	defer m.proxyMu.RUnlock()
+	return m.proxy
+}
+
+// setProxy updates the proxy instance (thread-safe for hot-reload).
+func (m *AmpModule) setProxy(proxy *httputil.ReverseProxy) {
+	m.proxyMu.Lock()
+	defer m.proxyMu.Unlock()
+	m.proxy = proxy
+}
+
+// IsRestrictedToLocalhost returns whether management routes are restricted to localhost.
+func (m *AmpModule) IsRestrictedToLocalhost() bool {
+	m.restrictMu.RLock()
+	defer m.restrictMu.RUnlock()
+	return m.restrictToLocalhost
+}
+
+// setRestrictToLocalhost updates the localhost restriction setting.
+func (m *AmpModule) setRestrictToLocalhost(restrict bool) {
+	m.restrictMu.Lock()
+	defer m.restrictMu.Unlock()
+	m.restrictToLocalhost = restrict
+}

internal/api/modules/amp/fallback_handlers.go

@@ -48,25 +48,25 @@ func logAmpRouting(routeType AmpRouteType, requestedModel, resolvedModel, provid
 	case RouteTypeLocalProvider:
 		fields["cost"] = "free"
 		fields["source"] = "local_oauth"
-		log.WithFields(fields).Infof("[amp] using local provider for model: %s", requestedModel)
+		log.WithFields(fields).Debugf("amp using local provider for model: %s", requestedModel)
 
 	case RouteTypeModelMapping:
 		fields["cost"] = "free"
 		fields["source"] = "local_oauth"
 		fields["mapping"] = requestedModel + " -> " + resolvedModel
-		log.WithFields(fields).Infof("[amp] model mapped: %s -> %s", requestedModel, resolvedModel)
+		// model mapping already logged in mapper; avoid duplicate here
 
 	case RouteTypeAmpCredits:
 		fields["cost"] = "amp_credits"
 		fields["source"] = "ampcode.com"
 		fields["model_id"] = requestedModel // Explicit model_id for easy config reference
-		log.WithFields(fields).Warnf("[amp] forwarding to ampcode.com (uses amp credits) - model_id: %s | To use local proxy, add to config: amp-model-mappings: [{from: \"%s\", to: \"<your-local-model>\"}]", requestedModel, requestedModel)
+		log.WithFields(fields).Warnf("forwarding to ampcode.com (uses amp credits) - model_id: %s | To use local proxy, add to config: amp-model-mappings: [{from: \"%s\", to: \"<your-local-model>\"}]", requestedModel, requestedModel)
 
 	case RouteTypeNoProvider:
 		fields["cost"] = "none"
 		fields["source"] = "error"
 		fields["model_id"] = requestedModel // Explicit model_id for easy config reference
-		log.WithFields(fields).Warnf("[amp] no provider available for model_id: %s", requestedModel)
+		log.WithFields(fields).Warnf("no provider available for model_id: %s", requestedModel)
 	}
 }
 

internal/api/modules/amp/model_mapping_test.go

@@ -152,9 +152,9 @@ func TestModelMapper_UpdateMappings_SkipsInvalid(t *testing.T) {
 	mapper := NewModelMapper(nil)
 
 	mapper.UpdateMappings([]config.AmpModelMapping{
-		{From: "", To: "model-b"},      // Invalid: empty from
-		{From: "model-a", To: ""},      // Invalid: empty to
-		{From: "  ", To: "model-b"},    // Invalid: whitespace from
+		{From: "", To: "model-b"},        // Invalid: empty from
+		{From: "model-a", To: ""},        // Invalid: empty to
+		{From: "  ", To: "model-b"},      // Invalid: whitespace from
 		{From: "model-c", To: "model-d"}, // Valid
 	})
 

internal/api/modules/amp/routes.go

@@ -1,11 +1,14 @@
 package amp
 
 import (
+	"errors"
 	"net"
+	"net/http"
 	"net/http/httputil"
 	"strings"
 
 	"github.com/gin-gonic/gin"
+	"github.com/router-for-me/CLIProxyAPI/v6/internal/logging"
 	"github.com/router-for-me/CLIProxyAPI/v6/internal/util"
 	"github.com/router-for-me/CLIProxyAPI/v6/sdk/api/handlers"
 	"github.com/router-for-me/CLIProxyAPI/v6/sdk/api/handlers/claude"
@@ -14,15 +17,16 @@ import (
 	log "github.com/sirupsen/logrus"
 )
 
-// localhostOnlyMiddleware restricts access to localhost (127.0.0.1, ::1) only.
-// Returns 403 Forbidden for non-localhost clients.
-//
-// Security: Uses RemoteAddr (actual TCP connection) instead of ClientIP() to prevent
-// header spoofing attacks via X-Forwarded-For or similar headers. This means the
-// middleware will not work correctly behind reverse proxies - users deploying behind
-// nginx/Cloudflare should disable this feature and use firewall rules instead.
-func localhostOnlyMiddleware() gin.HandlerFunc {
+// localhostOnlyMiddleware returns a middleware that dynamically checks the module's
+// localhost restriction setting. This allows hot-reload of the restriction without restarting.
+func (m *AmpModule) localhostOnlyMiddleware() gin.HandlerFunc {
 	return func(c *gin.Context) {
+		// Check current setting (hot-reloadable)
+		if !m.IsRestrictedToLocalhost() {
+			c.Next()
+			return
+		}
+
 		// Use actual TCP connection address (RemoteAddr) to prevent header spoofing
 		// This cannot be forged by X-Forwarded-For or other client-controlled headers
 		remoteAddr := c.Request.RemoteAddr
@@ -77,23 +81,58 @@ func noCORSMiddleware() gin.HandlerFunc {
 	}
 }
 
+// managementAvailabilityMiddleware short-circuits management routes when the upstream
+// proxy is disabled, preventing noisy localhost warnings and accidental exposure.
+func (m *AmpModule) managementAvailabilityMiddleware() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		if m.getProxy() == nil {
+			logging.SkipGinRequestLogging(c)
+			c.AbortWithStatusJSON(http.StatusServiceUnavailable, gin.H{
+				"error": "amp upstream proxy not available",
+			})
+			return
+		}
+		c.Next()
+	}
+}
+
 // registerManagementRoutes registers Amp management proxy routes
 // These routes proxy through to the Amp control plane for OAuth, user management, etc.
-// If restrictToLocalhost is true, routes will only accept connections from 127.0.0.1/::1.
-func (m *AmpModule) registerManagementRoutes(engine *gin.Engine, baseHandler *handlers.BaseAPIHandler, proxyHandler gin.HandlerFunc, restrictToLocalhost bool) {
+// Uses dynamic middleware and proxy getter for hot-reload support.
+func (m *AmpModule) registerManagementRoutes(engine *gin.Engine, baseHandler *handlers.BaseAPIHandler) {
 	ampAPI := engine.Group("/api")
 
 	// Always disable CORS for management routes to prevent browser-based attacks
-	ampAPI.Use(noCORSMiddleware())
+	ampAPI.Use(m.managementAvailabilityMiddleware(), noCORSMiddleware())
 
-	// Apply localhost-only restriction if configured
-	if restrictToLocalhost {
-		ampAPI.Use(localhostOnlyMiddleware())
-		log.Info("amp management routes restricted to localhost only (CORS disabled)")
-	} else {
+	// Apply dynamic localhost-only restriction (hot-reloadable via m.IsRestrictedToLocalhost())
+	ampAPI.Use(m.localhostOnlyMiddleware())
+
+	if !m.IsRestrictedToLocalhost() {
 		log.Warn("amp management routes are NOT restricted to localhost - this is insecure!")
 	}
 
+	// Dynamic proxy handler that uses m.getProxy() for hot-reload support
+	proxyHandler := func(c *gin.Context) {
+		// Swallow ErrAbortHandler panics from ReverseProxy copyResponse to avoid noisy stack traces
+		defer func() {
+			if rec := recover(); rec != nil {
+				if err, ok := rec.(error); ok && errors.Is(err, http.ErrAbortHandler) {
+					// Upstream already wrote the status (often 404) before the client/stream ended.
+					return
+				}
+				panic(rec)
+			}
+		}()
+
+		proxy := m.getProxy()
+		if proxy == nil {
+			c.JSON(503, gin.H{"error": "amp upstream proxy not available"})
+			return
+		}
+		proxy.ServeHTTP(c.Writer, c.Request)
+	}
+
 	// Management routes - these are proxied directly to Amp upstream
 	ampAPI.Any("/internal", proxyHandler)
 	ampAPI.Any("/internal/*path", proxyHandler)
@@ -114,11 +153,9 @@ func (m *AmpModule) registerManagementRoutes(engine *gin.Engine, baseHandler *ha
 	ampAPI.Any("/tab/*path", proxyHandler)
 
 	// Root-level routes that AMP CLI expects without /api prefix
-	// These need the same security middleware as the /api/* routes
-	rootMiddleware := []gin.HandlerFunc{noCORSMiddleware()}
-	if restrictToLocalhost {
-		rootMiddleware = append(rootMiddleware, localhostOnlyMiddleware())
-	}
+	// These need the same security middleware as the /api/* routes (dynamic for hot-reload)
+	rootMiddleware := []gin.HandlerFunc{m.managementAvailabilityMiddleware(), noCORSMiddleware(), m.localhostOnlyMiddleware()}
+	engine.GET("/threads/*path", append(rootMiddleware, proxyHandler)...)
 	engine.GET("/threads.rss", append(rootMiddleware, proxyHandler)...)
 
 	// Root-level auth routes for CLI login flow
@@ -134,7 +171,7 @@ func (m *AmpModule) registerManagementRoutes(engine *gin.Engine, baseHandler *ha
 	geminiHandlers := gemini.NewGeminiAPIHandler(baseHandler)
 	geminiBridge := createGeminiBridgeHandler(geminiHandlers)
 	geminiV1Beta1Fallback := NewFallbackHandler(func() *httputil.ReverseProxy {
-		return m.proxy
+		return m.getProxy()
 	})
 	geminiV1Beta1Handler := geminiV1Beta1Fallback.WrapHandler(geminiBridge)
 
@@ -177,10 +214,10 @@ func (m *AmpModule) registerProviderAliases(engine *gin.Engine, baseHandler *han
 	openaiResponsesHandlers := openai.NewOpenAIResponsesAPIHandler(baseHandler)
 
 	// Create fallback handler wrapper that forwards to ampcode.com when provider not found
-	// Uses lazy evaluation to access proxy (which is created after routes are registered)
+	// Uses m.getProxy() for hot-reload support (proxy can be updated at runtime)
 	// Also includes model mapping support for routing unavailable models to alternatives
 	fallbackHandler := NewFallbackHandlerWithMapper(func() *httputil.ReverseProxy {
-		return m.proxy
+		return m.getProxy()
 	}, m.modelMapper)
 
 	// Provider-specific routes under /api/provider/:provider

internal/api/modules/amp/routes_test.go

@@ -13,16 +13,26 @@ func TestRegisterManagementRoutes(t *testing.T) {
 	gin.SetMode(gin.TestMode)
 	r := gin.New()
 
-	// Spy to track if proxy handler was called
-	proxyCalled := false
-	proxyHandler := func(c *gin.Context) {
-		proxyCalled = true
-		c.String(200, "proxied")
+	// Create module with proxy for testing
+	m := &AmpModule{
+		restrictToLocalhost: false, // disable localhost restriction for tests
 	}
 
-	m := &AmpModule{}
+	// Create a mock proxy that tracks calls
+	proxyCalled := false
+	mockProxy := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		proxyCalled = true
+		w.WriteHeader(200)
+		w.Write([]byte("proxied"))
+	}))
+	defer mockProxy.Close()
+
+	// Create real proxy to mock server
+	proxy, _ := createReverseProxy(mockProxy.URL, NewStaticSecretSource(""))
+	m.setProxy(proxy)
+
 	base := &handlers.BaseAPIHandler{}
-	m.registerManagementRoutes(r, base, proxyHandler, false) // false = don't restrict to localhost in tests
+	m.registerManagementRoutes(r, base)
 
 	managementPaths := []struct {
 		path   string
@@ -37,13 +47,14 @@ func TestRegisterManagementRoutes(t *testing.T) {
 		{"/api/meta", http.MethodGet},
 		{"/api/telemetry", http.MethodGet},
 		{"/api/threads", http.MethodGet},
+		{"/threads/", http.MethodGet},
 		{"/threads.rss", http.MethodGet}, // Root-level route (no /api prefix)
 		{"/api/otel", http.MethodGet},
 		{"/api/tab", http.MethodGet},
 		{"/api/tab/some/path", http.MethodGet},
-		{"/auth", http.MethodGet},              // Root-level auth route
-		{"/auth/cli-login", http.MethodGet},    // CLI login flow
-		{"/auth/callback", http.MethodGet},     // OAuth callback
+		{"/auth", http.MethodGet},           // Root-level auth route
+		{"/auth/cli-login", http.MethodGet}, // CLI login flow
+		{"/auth/callback", http.MethodGet},  // OAuth callback
 		// Google v1beta1 bridge should still proxy non-model requests (GET) and allow POST
 		{"/api/provider/google/v1beta1/models", http.MethodGet},
 		{"/api/provider/google/v1beta1/models", http.MethodPost},
@@ -231,8 +242,13 @@ func TestLocalhostOnlyMiddleware_PreventsSpoofing(t *testing.T) {
 	gin.SetMode(gin.TestMode)
 	r := gin.New()
 
-	// Apply localhost-only middleware
-	r.Use(localhostOnlyMiddleware())
+	// Create module with localhost restriction enabled
+	m := &AmpModule{
+		restrictToLocalhost: true,
+	}
+
+	// Apply dynamic localhost-only middleware
+	r.Use(m.localhostOnlyMiddleware())
 	r.GET("/test", func(c *gin.Context) {
 		c.String(http.StatusOK, "ok")
 	})
@@ -305,3 +321,53 @@ func TestLocalhostOnlyMiddleware_PreventsSpoofing(t *testing.T) {
 		})
 	}
 }
+
+func TestLocalhostOnlyMiddleware_HotReload(t *testing.T) {
+	gin.SetMode(gin.TestMode)
+	r := gin.New()
+
+	// Create module with localhost restriction initially enabled
+	m := &AmpModule{
+		restrictToLocalhost: true,
+	}
+
+	// Apply dynamic localhost-only middleware
+	r.Use(m.localhostOnlyMiddleware())
+	r.GET("/test", func(c *gin.Context) {
+		c.String(http.StatusOK, "ok")
+	})
+
+	// Test 1: Remote IP should be blocked when restriction is enabled
+	req := httptest.NewRequest(http.MethodGet, "/test", nil)
+	req.RemoteAddr = "192.168.1.100:12345"
+	w := httptest.NewRecorder()
+	r.ServeHTTP(w, req)
+
+	if w.Code != http.StatusForbidden {
+		t.Errorf("Expected 403 when restriction enabled, got %d", w.Code)
+	}
+
+	// Test 2: Hot-reload - disable restriction
+	m.setRestrictToLocalhost(false)
+
+	req = httptest.NewRequest(http.MethodGet, "/test", nil)
+	req.RemoteAddr = "192.168.1.100:12345"
+	w = httptest.NewRecorder()
+	r.ServeHTTP(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Errorf("Expected 200 after disabling restriction, got %d", w.Code)
+	}
+
+	// Test 3: Hot-reload - re-enable restriction
+	m.setRestrictToLocalhost(true)
+
+	req = httptest.NewRequest(http.MethodGet, "/test", nil)
+	req.RemoteAddr = "192.168.1.100:12345"
+	w = httptest.NewRecorder()
+	r.ServeHTTP(w, req)
+
+	if w.Code != http.StatusForbidden {
+		t.Errorf("Expected 403 after re-enabling restriction, got %d", w.Code)
+	}
+}

internal/api/modules/amp/secret.go

@@ -139,6 +139,17 @@ func (s *MultiSourceSecret) InvalidateCache() {
 	s.cache = nil
 }
 
+// UpdateExplicitKey refreshes the config-provided key and clears cache.
+func (s *MultiSourceSecret) UpdateExplicitKey(key string) {
+	if s == nil {
+		return
+	}
+	s.mu.Lock()
+	s.explicitKey = strings.TrimSpace(key)
+	s.cache = nil
+	s.mu.Unlock()
+}
+
 // StaticSecretSource returns a fixed API key (for testing)
 type StaticSecretSource struct {
 	key string

internal/api/server.go

@@ -472,6 +472,7 @@ func (s *Server) registerManagementRoutes() {
 		mgmt.GET("/config", s.mgmt.GetConfig)
 		mgmt.GET("/config.yaml", s.mgmt.GetConfigYAML)
 		mgmt.PUT("/config.yaml", s.mgmt.PutConfigYAML)
+		mgmt.GET("/latest-version", s.mgmt.GetLatestVersion)
 
 		mgmt.GET("/debug", s.mgmt.GetDebug)
 		mgmt.PUT("/debug", s.mgmt.PutDebug)

internal/interfaces/client_models.go

@@ -85,6 +85,9 @@ type InlineData struct {
 // FunctionCall represents a tool call requested by the model.
 // It includes the function name and its arguments that the model wants to execute.
 type FunctionCall struct {
+	// ID is the identifier of the function to be called.
+	ID string `json:"id,omitempty"`
+
 	// Name is the identifier of the function to be called.
 	Name string `json:"name"`
 
@@ -95,6 +98,9 @@ type FunctionCall struct {
 // FunctionResponse represents the result of a tool execution.
 // This is sent back to the model after a tool call has been processed.
 type FunctionResponse struct {
+	// ID is the identifier of the function to be called.
+	ID string `json:"id,omitempty"`
+
 	// Name is the identifier of the function that was called.
 	Name string `json:"name"`
 

internal/logging/gin_logger.go

@@ -14,6 +14,8 @@ import (
 	log "github.com/sirupsen/logrus"
 )
 
+const skipGinLogKey = "__gin_skip_request_logging__"
+
 // GinLogrusLogger returns a Gin middleware handler that logs HTTP requests and responses
 // using logrus. It captures request details including method, path, status code, latency,
 // client IP, and any error messages, formatting them in a Gin-style log format.
@@ -28,6 +30,10 @@ func GinLogrusLogger() gin.HandlerFunc {
 
 		c.Next()
 
+		if shouldSkipGinRequestLogging(c) {
+			return
+		}
+
 		if raw != "" {
 			path = path + "?" + raw
 		}
@@ -77,3 +83,24 @@ func GinLogrusRecovery() gin.HandlerFunc {
 		c.AbortWithStatus(http.StatusInternalServerError)
 	})
 }
+
+// SkipGinRequestLogging marks the provided Gin context so that GinLogrusLogger
+// will skip emitting a log line for the associated request.
+func SkipGinRequestLogging(c *gin.Context) {
+	if c == nil {
+		return
+	}
+	c.Set(skipGinLogKey, true)
+}
+
+func shouldSkipGinRequestLogging(c *gin.Context) bool {
+	if c == nil {
+		return false
+	}
+	val, exists := c.Get(skipGinLogKey)
+	if !exists {
+		return false
+	}
+	flag, ok := val.(bool)
+	return ok && flag
+}

internal/runtime/executor/antigravity_executor.go

@@ -17,6 +17,7 @@ import (
 	"github.com/google/uuid"
 	"github.com/router-for-me/CLIProxyAPI/v6/internal/config"
 	"github.com/router-for-me/CLIProxyAPI/v6/internal/registry"
+	"github.com/router-for-me/CLIProxyAPI/v6/internal/util"
 	cliproxyauth "github.com/router-for-me/CLIProxyAPI/v6/sdk/cliproxy/auth"
 	cliproxyexecutor "github.com/router-for-me/CLIProxyAPI/v6/sdk/cliproxy/executor"
 	sdktranslator "github.com/router-for-me/CLIProxyAPI/v6/sdk/translator"
@@ -508,8 +509,46 @@ func (e *AntigravityExecutor) buildRequest(ctx context.Context, auth *cliproxyau
 		requestURL.WriteString(url.QueryEscape(alt))
 	}
 
-	payload = geminiToAntigravity(modelName, payload)
+	// Extract project_id from auth metadata if available
+	projectID := ""
+	if auth != nil && auth.Metadata != nil {
+		if pid, ok := auth.Metadata["project_id"].(string); ok {
+			projectID = strings.TrimSpace(pid)
+		}
+	}
+	payload = geminiToAntigravity(modelName, payload, projectID)
 	payload, _ = sjson.SetBytes(payload, "model", alias2ModelName(modelName))
+
+	if strings.Contains(modelName, "claude") {
+		strJSON := string(payload)
+		paths := make([]string, 0)
+		util.Walk(gjson.ParseBytes(payload), "", "parametersJsonSchema", &paths)
+		for _, p := range paths {
+			strJSON, _ = util.RenameKey(strJSON, p, p[:len(p)-len("parametersJsonSchema")]+"parameters")
+		}
+
+		strJSON = util.DeleteKey(strJSON, "$schema")
+		strJSON = util.DeleteKey(strJSON, "maxItems")
+		strJSON = util.DeleteKey(strJSON, "minItems")
+		strJSON = util.DeleteKey(strJSON, "minLength")
+		strJSON = util.DeleteKey(strJSON, "maxLength")
+		strJSON = util.DeleteKey(strJSON, "exclusiveMinimum")
+
+		paths = make([]string, 0)
+		util.Walk(gjson.Parse(strJSON), "", "anyOf", &paths)
+		for _, p := range paths {
+			anyOf := gjson.Get(strJSON, p)
+			if anyOf.IsArray() {
+				anyOfItems := anyOf.Array()
+				if len(anyOfItems) > 0 {
+					strJSON, _ = sjson.SetRaw(strJSON, p[:len(p)-len(".anyOf")], anyOfItems[0].Raw)
+				}
+			}
+		}
+
+		payload = []byte(strJSON)
+	}
+
 	httpReq, errReq := http.NewRequestWithContext(ctx, http.MethodPost, requestURL.String(), bytes.NewReader(payload))
 	if errReq != nil {
 		return nil, errReq
@@ -670,10 +709,16 @@ func resolveCustomAntigravityBaseURL(auth *cliproxyauth.Auth) string {
 	return ""
 }
 
-func geminiToAntigravity(modelName string, payload []byte) []byte {
+func geminiToAntigravity(modelName string, payload []byte, projectID string) []byte {
 	template, _ := sjson.Set(string(payload), "model", modelName)
 	template, _ = sjson.Set(template, "userAgent", "antigravity")
-	template, _ = sjson.Set(template, "project", generateProjectID())
+
+	// Use real project ID from auth if available, otherwise generate random (legacy fallback)
+	if projectID != "" {
+		template, _ = sjson.Set(template, "project", projectID)
+	} else {
+		template, _ = sjson.Set(template, "project", generateProjectID())
+	}
 	template, _ = sjson.Set(template, "requestId", generateRequestID())
 	template, _ = sjson.Set(template, "request.sessionId", generateSessionID())
 

internal/translator/antigravity/claude/antigravity_claude_request.go

@@ -89,10 +89,11 @@ func ConvertClaudeRequestToAntigravity(modelName string, inputRawJSON []byte, _
 					} else if contentTypeResult.Type == gjson.String && contentTypeResult.String() == "tool_use" {
 						functionName := contentResult.Get("name").String()
 						functionArgs := contentResult.Get("input").String()
+						functionID := contentResult.Get("id").String()
 						var args map[string]any
 						if err := json.Unmarshal([]byte(functionArgs), &args); err == nil {
 							clientContent.Parts = append(clientContent.Parts, client.Part{
-								FunctionCall:     &client.FunctionCall{Name: functionName, Args: args},
+								FunctionCall:     &client.FunctionCall{ID: functionID, Name: functionName, Args: args},
 								ThoughtSignature: geminiCLIClaudeThoughtSignature,
 							})
 						}
@@ -105,7 +106,7 @@ func ConvertClaudeRequestToAntigravity(modelName string, inputRawJSON []byte, _
 								funcName = strings.Join(toolCallIDs[0:len(toolCallIDs)-1], "-")
 							}
 							responseData := contentResult.Get("content").Raw
-							functionResponse := client.FunctionResponse{Name: funcName, Response: map[string]interface{}{"result": responseData}}
+							functionResponse := client.FunctionResponse{ID: toolCallID, Name: funcName, Response: map[string]interface{}{"result": responseData}}
 							clientContent.Parts = append(clientContent.Parts, client.Part{FunctionResponse: &functionResponse})
 						}
 					}

internal/translator/antigravity/claude/antigravity_claude_response.go

@@ -141,35 +141,38 @@ func ConvertAntigravityResponseToClaude(_ context.Context, _ string, originalReq
 						params.ResponseType = 2 // Set state to thinking
 					}
 				} else {
-					// Process regular text content (user-visible output)
-					// Continue existing text block if already in content state
-					if params.ResponseType == 1 {
-						output = output + "event: content_block_delta\n"
-						data, _ := sjson.Set(fmt.Sprintf(`{"type":"content_block_delta","index":%d,"delta":{"type":"text_delta","text":""}}`, params.ResponseIndex), "delta.text", partTextResult.String())
-						output = output + fmt.Sprintf("data: %s\n\n\n", data)
-					} else {
-						// Transition from another state to text content
-						// First, close any existing content block
-						if params.ResponseType != 0 {
-							if params.ResponseType == 2 {
-								// output = output + "event: content_block_delta\n"
-								// output = output + fmt.Sprintf(`data: {"type":"content_block_delta","index":%d,"delta":{"type":"signature_delta","signature":null}}`, params.ResponseIndex)
-								// output = output + "\n\n\n"
+					finishReasonResult := gjson.GetBytes(rawJSON, "response.candidates.0.finishReason")
+					if partTextResult.String() != "" || !finishReasonResult.Exists() {
+						// Process regular text content (user-visible output)
+						// Continue existing text block if already in content state
+						if params.ResponseType == 1 {
+							output = output + "event: content_block_delta\n"
+							data, _ := sjson.Set(fmt.Sprintf(`{"type":"content_block_delta","index":%d,"delta":{"type":"text_delta","text":""}}`, params.ResponseIndex), "delta.text", partTextResult.String())
+							output = output + fmt.Sprintf("data: %s\n\n\n", data)
+						} else {
+							// Transition from another state to text content
+							// First, close any existing content block
+							if params.ResponseType != 0 {
+								if params.ResponseType == 2 {
+									// output = output + "event: content_block_delta\n"
+									// output = output + fmt.Sprintf(`data: {"type":"content_block_delta","index":%d,"delta":{"type":"signature_delta","signature":null}}`, params.ResponseIndex)
+									// output = output + "\n\n\n"
+								}
+								output = output + "event: content_block_stop\n"
+								output = output + fmt.Sprintf(`data: {"type":"content_block_stop","index":%d}`, params.ResponseIndex)
+								output = output + "\n\n\n"
+								params.ResponseIndex++
 							}
-							output = output + "event: content_block_stop\n"
-							output = output + fmt.Sprintf(`data: {"type":"content_block_stop","index":%d}`, params.ResponseIndex)
-							output = output + "\n\n\n"
-							params.ResponseIndex++
-						}
 
-						// Start a new text content block
-						output = output + "event: content_block_start\n"
-						output = output + fmt.Sprintf(`data: {"type":"content_block_start","index":%d,"content_block":{"type":"text","text":""}}`, params.ResponseIndex)
-						output = output + "\n\n\n"
-						output = output + "event: content_block_delta\n"
-						data, _ := sjson.Set(fmt.Sprintf(`{"type":"content_block_delta","index":%d,"delta":{"type":"text_delta","text":""}}`, params.ResponseIndex), "delta.text", partTextResult.String())
-						output = output + fmt.Sprintf("data: %s\n\n\n", data)
-						params.ResponseType = 1 // Set state to content
+							// Start a new text content block
+							output = output + "event: content_block_start\n"
+							output = output + fmt.Sprintf(`data: {"type":"content_block_start","index":%d,"content_block":{"type":"text","text":""}}`, params.ResponseIndex)
+							output = output + "\n\n\n"
+							output = output + "event: content_block_delta\n"
+							data, _ := sjson.Set(fmt.Sprintf(`{"type":"content_block_delta","index":%d,"delta":{"type":"text_delta","text":""}}`, params.ResponseIndex), "delta.text", partTextResult.String())
+							output = output + fmt.Sprintf("data: %s\n\n\n", data)
+							params.ResponseType = 1 // Set state to content
+						}
 					}
 				}
 			} else if functionCallResult.Exists() {

internal/translator/antigravity/openai/chat-completions/antigravity_openai_request.go

@@ -251,6 +251,7 @@ func ConvertOpenAIRequestToAntigravity(modelName string, inputRawJSON []byte, _
 							fid := tc.Get("id").String()
 							fname := tc.Get("function.name").String()
 							fargs := tc.Get("function.arguments").String()
+							node, _ = sjson.SetBytes(node, "parts."+itoa(p)+".functionCall.id", fid)
 							node, _ = sjson.SetBytes(node, "parts."+itoa(p)+".functionCall.name", fname)
 							node, _ = sjson.SetRawBytes(node, "parts."+itoa(p)+".functionCall.args", []byte(fargs))
 							node, _ = sjson.SetBytes(node, "parts."+itoa(p)+".thoughtSignature", geminiCLIFunctionThoughtSignature)
@@ -266,6 +267,7 @@ func ConvertOpenAIRequestToAntigravity(modelName string, inputRawJSON []byte, _
 						pp := 0
 						for _, fid := range fIDs {
 							if name, ok := tcID2Name[fid]; ok {
+								toolNode, _ = sjson.SetBytes(toolNode, "parts."+itoa(pp)+".functionResponse.id", fid)
 								toolNode, _ = sjson.SetBytes(toolNode, "parts."+itoa(pp)+".functionResponse.name", name)
 								resp := toolResponses[fid]
 								if resp == "" {

internal/translator/codex/gemini/codex_gemini_response.go

@@ -327,7 +327,7 @@ func buildReverseMapFromGeminiOriginal(original []byte) map[string]string {
 func mustMarshalJSON(v interface{}) string {
 	data, err := json.Marshal(v)
 	if err != nil {
-		panic(err)
+		return ""
 	}
 	return string(data)
 }

internal/translator/gemini/openai/responses/gemini_openai-responses_request.go

@@ -249,6 +249,7 @@ func ConvertOpenAIResponsesRequestToGemini(modelName string, inputRawJSON []byte
 				functionCall := `{"functionCall":{"name":"","args":{}}}`
 				functionCall, _ = sjson.Set(functionCall, "functionCall.name", name)
 				functionCall, _ = sjson.Set(functionCall, "thoughtSignature", geminiResponsesThoughtSignature)
+				functionCall, _ = sjson.Set(functionCall, "functionCall.id", item.Get("call_id").String())
 
 				// Parse arguments JSON string and set as args object
 				if arguments != "" {
@@ -285,6 +286,7 @@ func ConvertOpenAIResponsesRequestToGemini(modelName string, inputRawJSON []byte
 				}
 
 				functionResponse, _ = sjson.Set(functionResponse, "functionResponse.name", functionName)
+				functionResponse, _ = sjson.Set(functionResponse, "functionResponse.id", callID)
 
 				// Set the raw JSON output directly (preserves string encoding)
 				if outputRaw != "" && outputRaw != "null" {

internal/util/translator.go

@@ -79,6 +79,15 @@ func RenameKey(jsonStr, oldKeyPath, newKeyPath string) (string, error) {
 	return finalJson, nil
 }
 
+func DeleteKey(jsonStr, keyName string) string {
+	paths := make([]string, 0)
+	Walk(gjson.Parse(jsonStr), "", keyName, &paths)
+	for _, p := range paths {
+		jsonStr, _ = sjson.Delete(jsonStr, p)
+	}
+	return jsonStr
+}
+
 // FixJSON converts non-standard JSON that uses single quotes for strings into
 // RFC 8259-compliant JSON by converting those single-quoted strings to
 // double-quoted strings with proper escaping.

internal/watcher/watcher.go

@@ -570,6 +570,35 @@ func summarizeExcludedModels(list []string) excludedModelsSummary {
 	}
 }
 
+type ampModelMappingsSummary struct {
+	hash  string
+	count int
+}
+
+func summarizeAmpModelMappings(mappings []config.AmpModelMapping) ampModelMappingsSummary {
+	if len(mappings) == 0 {
+		return ampModelMappingsSummary{}
+	}
+	entries := make([]string, 0, len(mappings))
+	for _, mapping := range mappings {
+		from := strings.TrimSpace(mapping.From)
+		to := strings.TrimSpace(mapping.To)
+		if from == "" && to == "" {
+			continue
+		}
+		entries = append(entries, from+"->"+to)
+	}
+	if len(entries) == 0 {
+		return ampModelMappingsSummary{}
+	}
+	sort.Strings(entries)
+	sum := sha256.Sum256([]byte(strings.Join(entries, "|")))
+	return ampModelMappingsSummary{
+		hash:  hex.EncodeToString(sum[:]),
+		count: len(entries),
+	}
+}
+
 func summarizeOAuthExcludedModels(entries map[string][]string) map[string]excludedModelsSummary {
 	if len(entries) == 0 {
 		return nil
@@ -1762,6 +1791,31 @@ func buildConfigChangeDetails(oldCfg, newCfg *config.Config) []string {
 		}
 	}
 
+	// AmpCode settings (redacted where needed)
+	oldAmpURL := strings.TrimSpace(oldCfg.AmpCode.UpstreamURL)
+	newAmpURL := strings.TrimSpace(newCfg.AmpCode.UpstreamURL)
+	if oldAmpURL != newAmpURL {
+		changes = append(changes, fmt.Sprintf("ampcode.upstream-url: %s -> %s", oldAmpURL, newAmpURL))
+	}
+	oldAmpKey := strings.TrimSpace(oldCfg.AmpCode.UpstreamAPIKey)
+	newAmpKey := strings.TrimSpace(newCfg.AmpCode.UpstreamAPIKey)
+	switch {
+	case oldAmpKey == "" && newAmpKey != "":
+		changes = append(changes, "ampcode.upstream-api-key: added")
+	case oldAmpKey != "" && newAmpKey == "":
+		changes = append(changes, "ampcode.upstream-api-key: removed")
+	case oldAmpKey != newAmpKey:
+		changes = append(changes, "ampcode.upstream-api-key: updated")
+	}
+	if oldCfg.AmpCode.RestrictManagementToLocalhost != newCfg.AmpCode.RestrictManagementToLocalhost {
+		changes = append(changes, fmt.Sprintf("ampcode.restrict-management-to-localhost: %t -> %t", oldCfg.AmpCode.RestrictManagementToLocalhost, newCfg.AmpCode.RestrictManagementToLocalhost))
+	}
+	oldMappings := summarizeAmpModelMappings(oldCfg.AmpCode.ModelMappings)
+	newMappings := summarizeAmpModelMappings(newCfg.AmpCode.ModelMappings)
+	if oldMappings.hash != newMappings.hash {
+		changes = append(changes, fmt.Sprintf("ampcode.model-mappings: updated (%d -> %d entries)", oldMappings.count, newMappings.count))
+	}
+
 	if entries, _ := diffOAuthExcludedModelChanges(oldCfg.OAuthExcludedModels, newCfg.OAuthExcludedModels); len(entries) > 0 {
 		changes = append(changes, entries...)
 	}

sdk/auth/antigravity.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"io"
 	"net"
 	"net/http"
 	"net/url"
@@ -127,6 +128,18 @@ func (AntigravityAuthenticator) Login(ctx context.Context, cfg *config.Config, o
 		}
 	}
 
+	// Fetch project ID via loadCodeAssist (same approach as Gemini CLI)
+	projectID := ""
+	if tokenResp.AccessToken != "" {
+		fetchedProjectID, errProject := fetchAntigravityProjectID(ctx, tokenResp.AccessToken, httpClient)
+		if errProject != nil {
+			log.Warnf("antigravity: failed to fetch project ID: %v", errProject)
+		} else {
+			projectID = fetchedProjectID
+			log.Infof("antigravity: obtained project ID %s", projectID)
+		}
+	}
+
 	now := time.Now()
 	metadata := map[string]any{
 		"type":          "antigravity",
@@ -139,6 +152,9 @@ func (AntigravityAuthenticator) Login(ctx context.Context, cfg *config.Config, o
 	if email != "" {
 		metadata["email"] = email
 	}
+	if projectID != "" {
+		metadata["project_id"] = projectID
+	}
 
 	fileName := sanitizeAntigravityFileName(email)
 	label := email
@@ -147,6 +163,9 @@ func (AntigravityAuthenticator) Login(ctx context.Context, cfg *config.Config, o
 	}
 
 	fmt.Println("Antigravity authentication successful")
+	if projectID != "" {
+		fmt.Printf("Using GCP project: %s\n", projectID)
+	}
 	return &coreauth.Auth{
 		ID:       fileName,
 		Provider: "antigravity",
@@ -291,3 +310,89 @@ func sanitizeAntigravityFileName(email string) string {
 	replacer := strings.NewReplacer("@", "_", ".", "_")
 	return fmt.Sprintf("antigravity-%s.json", replacer.Replace(email))
 }
+
+// Antigravity API constants for project discovery
+const (
+	antigravityAPIEndpoint    = "https://cloudcode-pa.googleapis.com"
+	antigravityAPIVersion     = "v1internal"
+	antigravityAPIUserAgent   = "google-api-nodejs-client/9.15.1"
+	antigravityAPIClient      = "google-cloud-sdk vscode_cloudshelleditor/0.1"
+	antigravityClientMetadata = `{"ideType":"IDE_UNSPECIFIED","platform":"PLATFORM_UNSPECIFIED","pluginType":"GEMINI"}`
+)
+
+// FetchAntigravityProjectID exposes project discovery for external callers.
+func FetchAntigravityProjectID(ctx context.Context, accessToken string, httpClient *http.Client) (string, error) {
+	return fetchAntigravityProjectID(ctx, accessToken, httpClient)
+}
+
+// fetchAntigravityProjectID retrieves the project ID for the authenticated user via loadCodeAssist.
+// This uses the same approach as Gemini CLI to get the cloudaicompanionProject.
+func fetchAntigravityProjectID(ctx context.Context, accessToken string, httpClient *http.Client) (string, error) {
+	// Call loadCodeAssist to get the project
+	loadReqBody := map[string]any{
+		"metadata": map[string]string{
+			"ideType":    "IDE_UNSPECIFIED",
+			"platform":   "PLATFORM_UNSPECIFIED",
+			"pluginType": "GEMINI",
+		},
+	}
+
+	rawBody, errMarshal := json.Marshal(loadReqBody)
+	if errMarshal != nil {
+		return "", fmt.Errorf("marshal request body: %w", errMarshal)
+	}
+
+	endpointURL := fmt.Sprintf("%s/%s:loadCodeAssist", antigravityAPIEndpoint, antigravityAPIVersion)
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, endpointURL, strings.NewReader(string(rawBody)))
+	if err != nil {
+		return "", fmt.Errorf("create request: %w", err)
+	}
+	req.Header.Set("Authorization", "Bearer "+accessToken)
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("User-Agent", antigravityAPIUserAgent)
+	req.Header.Set("X-Goog-Api-Client", antigravityAPIClient)
+	req.Header.Set("Client-Metadata", antigravityClientMetadata)
+
+	resp, errDo := httpClient.Do(req)
+	if errDo != nil {
+		return "", fmt.Errorf("execute request: %w", errDo)
+	}
+	defer func() {
+		if errClose := resp.Body.Close(); errClose != nil {
+			log.Errorf("antigravity loadCodeAssist: close body error: %v", errClose)
+		}
+	}()
+
+	bodyBytes, errRead := io.ReadAll(resp.Body)
+	if errRead != nil {
+		return "", fmt.Errorf("read response: %w", errRead)
+	}
+
+	if resp.StatusCode < http.StatusOK || resp.StatusCode >= http.StatusMultipleChoices {
+		return "", fmt.Errorf("request failed with status %d: %s", resp.StatusCode, strings.TrimSpace(string(bodyBytes)))
+	}
+
+	var loadResp map[string]any
+	if errDecode := json.Unmarshal(bodyBytes, &loadResp); errDecode != nil {
+		return "", fmt.Errorf("decode response: %w", errDecode)
+	}
+
+	// Extract projectID from response
+	projectID := ""
+	if id, ok := loadResp["cloudaicompanionProject"].(string); ok {
+		projectID = strings.TrimSpace(id)
+	}
+	if projectID == "" {
+		if projectMap, ok := loadResp["cloudaicompanionProject"].(map[string]any); ok {
+			if id, okID := projectMap["id"].(string); okID {
+				projectID = strings.TrimSpace(id)
+			}
+		}
+	}
+
+	if projectID == "" {
+		return "", fmt.Errorf("no cloudaicompanionProject in response")
+	}
+
+	return projectID, nil
+}