endpoint model discovery and proxy integration

management/internals/modules/agentnetwork/catalog/catalog.go

@@ -101,6 +101,17 @@ type Provider struct {
 	// upstream provider + credentials on Portkey's hosted side).
 	ExtraHeaders []ExtraHeader
 	Models       []Model
+	// ModelDiscovery configures provider-specific discovery behavior. A nil
+	// profile means discovery is unsupported. The profile never carries
+	// caller-supplied paths: the proxy owns the fixed endpoint allowlist.
+	ModelDiscovery *ModelDiscovery
+}
+
+// ModelDiscovery describes the safe, catalog-owned fallback behavior for a
+// discoverable provider. Every discovery starts with OpenAI-compatible
+// /v1/models; OllamaFallback permits /api/tags only when that route is absent.
+type ModelDiscovery struct {
+	OllamaFallback bool
 }
 
 // ExtraHeader names a single optional per-provider routing/config
@@ -732,6 +743,9 @@ var providers = []Provider{
 		DefaultContentType: "application/json",
 		BrandColor:         "#000000",
 		Models:             []Model{},
+		ModelDiscovery: &ModelDiscovery{
+			OllamaFallback: true,
+		},
 	},
 	{
 		ID:                 "custom",
@@ -815,16 +829,17 @@ func (p Provider) ToAPIResponse() api.AgentNetworkCatalogProvider {
 		kind = api.AgentNetworkCatalogProviderKindCustom
 	}
 	resp := api.AgentNetworkCatalogProvider{
-		Id:                 p.ID,
-		Name:               p.Name,
-		Description:        p.Description,
-		DefaultHost:        p.DefaultHost,
-		Kind:               kind,
-		AuthMode:           api.AgentNetworkCatalogProviderAuthMode(p.EffectiveAuthMode()),
-		AuthHeaderTemplate: p.AuthHeaderTemplate,
-		DefaultContentType: p.DefaultContentType,
-		BrandColor:         p.BrandColor,
-		Models:             models,
+		Id:                     p.ID,
+		Name:                   p.Name,
+		Description:            p.Description,
+		DefaultHost:            p.DefaultHost,
+		Kind:                   kind,
+		AuthMode:               api.AgentNetworkCatalogProviderAuthMode(p.EffectiveAuthMode()),
+		AuthHeaderTemplate:     p.AuthHeaderTemplate,
+		DefaultContentType:     p.DefaultContentType,
+		BrandColor:             p.BrandColor,
+		Models:                 models,
+		SupportsModelDiscovery: p.ModelDiscovery != nil,
 	}
 	if len(p.ExtraHeaders) > 0 {
 		extras := make([]api.AgentNetworkCatalogExtraHeader, 0, len(p.ExtraHeaders))

management/internals/modules/agentnetwork/catalog/catalog_test.go

@@ -23,15 +23,26 @@ func TestOllamaCatalogEntry(t *testing.T) {
 	assert.Equal(t, "application/json", entry.DefaultContentType)
 	assert.Empty(t, entry.ParserID, "Ollama preserves the untagged vLLM/custom routing behavior")
 	assert.Empty(t, entry.Models, "Ollama models are installed dynamically on the configured endpoint")
+	require.NotNil(t, entry.ModelDiscovery)
+	assert.True(t, entry.ModelDiscovery.OllamaFallback)
 
 	wire := entry.ToAPIResponse()
 	assert.Equal(t, "ollama", wire.Id)
 	assert.Equal(t, api.AgentNetworkCatalogProviderKindCustom, wire.Kind)
 	assert.Equal(t, api.AgentNetworkCatalogProviderAuthModeOptional, wire.AuthMode)
+	assert.True(t, wire.SupportsModelDiscovery)
 	assert.NotNil(t, wire.Models)
 	assert.Empty(t, wire.Models)
 }
 
+func TestOnlyOllamaSupportsModelDiscovery(t *testing.T) {
+	for _, entry := range All() {
+		supportsDiscovery := entry.ModelDiscovery != nil
+		assert.Equal(t, entry.ID == "ollama", supportsDiscovery, entry.ID)
+		assert.Equal(t, supportsDiscovery, entry.ToAPIResponse().SupportsModelDiscovery, entry.ID)
+	}
+}
+
 func TestCatalogAuthenticationModes(t *testing.T) {
 	openAI, ok := Lookup("openai_api")
 	require.True(t, ok)

management/internals/modules/agentnetwork/handlers/providers_discovery_test.go

@@ -0,0 +1,72 @@
+package handlers
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/gorilla/mux"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/netbirdio/netbird/management/internals/modules/agentnetwork"
+	agentNetworkTypes "github.com/netbirdio/netbird/management/internals/modules/agentnetwork/types"
+	nbcontext "github.com/netbirdio/netbird/management/server/context"
+	"github.com/netbirdio/netbird/shared/auth"
+	"github.com/netbirdio/netbird/shared/management/http/api"
+)
+
+type discoveryManagerStub struct {
+	agentnetwork.Manager
+	result     *agentNetworkTypes.ModelDiscoveryResult
+	err        error
+	accountID  string
+	userID     string
+	providerID string
+}
+
+func (m *discoveryManagerStub) DiscoverProviderModels(_ context.Context, accountID, userID, providerID string) (*agentNetworkTypes.ModelDiscoveryResult, error) {
+	m.accountID = accountID
+	m.userID = userID
+	m.providerID = providerID
+	return m.result, m.err
+}
+
+func TestDiscoverProviderModelsHandler(t *testing.T) {
+	manager := &discoveryManagerStub{
+		Manager: agentnetwork.NewManagerMock(),
+		result: &agentNetworkTypes.ModelDiscoveryResult{
+			RequestID:    "probe-123",
+			Source:       "ollama_api_tags",
+			ProxyCluster: "private.example.com",
+			Models: []agentNetworkTypes.DiscoveredModel{
+				{ID: "llama3.2:latest", Label: "llama3.2:latest"},
+			},
+		},
+	}
+	router := mux.NewRouter()
+	RegisterEndpoints(manager, router)
+
+	req := httptest.NewRequest(http.MethodPost, "/agent-network/providers/provider-1/discover-models", nil)
+	req = nbcontext.SetUserAuthInRequest(req, auth.UserAuth{
+		UserId:    testUserID,
+		AccountId: testAccountID,
+	})
+	rec := httptest.NewRecorder()
+	router.ServeHTTP(rec, req)
+
+	require.Equal(t, http.StatusOK, rec.Code, rec.Body.String())
+	assert.Equal(t, "no-store", rec.Header().Get("Cache-Control"))
+	var response api.AgentNetworkModelDiscoveryResponse
+	require.NoError(t, json.Unmarshal(rec.Body.Bytes(), &response))
+	assert.Equal(t, testAccountID, manager.accountID)
+	assert.Equal(t, testUserID, manager.userID)
+	assert.Equal(t, "provider-1", manager.providerID)
+	assert.Equal(t, "probe-123", response.RequestId)
+	assert.Equal(t, "private.example.com", response.ProxyCluster)
+	assert.Equal(t, api.AgentNetworkModelDiscoveryResponseSourceOllamaApiTags, response.Source)
+	require.Len(t, response.Models, 1)
+	assert.Equal(t, "llama3.2:latest", response.Models[0].Id)
+}

management/internals/modules/agentnetwork/handlers/providers_handler.go

@@ -35,6 +35,7 @@ func RegisterEndpoints(manager agentnetwork.Manager, router *mux.Router) {
 	router.HandleFunc("/agent-network/providers/{providerId}", h.getProvider).Methods("GET", "OPTIONS")
 	router.HandleFunc("/agent-network/providers/{providerId}", h.updateProvider).Methods("PUT", "OPTIONS")
 	router.HandleFunc("/agent-network/providers/{providerId}", h.deleteProvider).Methods("DELETE", "OPTIONS")
+	router.HandleFunc("/agent-network/providers/{providerId}/discover-models", h.discoverProviderModels).Methods("POST", "OPTIONS")
 	h.addPolicyEndpoints(router)
 	h.addGuardrailEndpoints(router)
 	h.addSettingsEndpoints(router)
@@ -98,6 +99,41 @@ func (h *handler) getProvider(w http.ResponseWriter, r *http.Request) {
 	util.WriteJSONObject(r.Context(), w, provider.ToAPIResponse())
 }
 
+func (h *handler) discoverProviderModels(w http.ResponseWriter, r *http.Request) {
+	userAuth, err := nbcontext.GetUserAuthFromContext(r.Context())
+	if err != nil {
+		util.WriteError(r.Context(), err, w)
+		return
+	}
+
+	providerID := strings.TrimSpace(mux.Vars(r)["providerId"])
+	if providerID == "" {
+		util.WriteError(r.Context(), status.Errorf(status.InvalidArgument, "provider ID is required"), w)
+		return
+	}
+
+	result, err := h.manager.DiscoverProviderModels(r.Context(), userAuth.AccountId, userAuth.UserId, providerID)
+	if err != nil {
+		util.WriteError(r.Context(), err, w)
+		return
+	}
+
+	models := make([]api.AgentNetworkDiscoveredModel, 0, len(result.Models))
+	for _, model := range result.Models {
+		models = append(models, api.AgentNetworkDiscoveredModel{
+			Id:    model.ID,
+			Label: model.Label,
+		})
+	}
+	w.Header().Set("Cache-Control", "no-store")
+	util.WriteJSONObject(r.Context(), w, api.AgentNetworkModelDiscoveryResponse{
+		Models:       models,
+		Source:       api.AgentNetworkModelDiscoveryResponseSource(result.Source),
+		ProxyCluster: result.ProxyCluster,
+		RequestId:    result.RequestID,
+	})
+}
+
 func (h *handler) createProvider(w http.ResponseWriter, r *http.Request) {
 	userAuth, err := nbcontext.GetUserAuthFromContext(r.Context())
 	if err != nil {

management/internals/modules/agentnetwork/manager.go

@@ -9,6 +9,8 @@ import (
 	"strings"
 	"sync"
 	"time"
+	"unicode"
+	"unicode/utf8"
 
 	log "github.com/sirupsen/logrus"
 
@@ -49,6 +51,7 @@ func ensureSessionKeys(p *types.Provider) error {
 type Manager interface {
 	GetAllProviders(ctx context.Context, accountID, userID string) ([]*types.Provider, error)
 	GetProvider(ctx context.Context, accountID, userID, providerID string) (*types.Provider, error)
+	DiscoverProviderModels(ctx context.Context, accountID, userID, providerID string) (*types.ModelDiscoveryResult, error)
 	CreateProvider(ctx context.Context, userID string, provider *types.Provider, bootstrapCluster string) (*types.Provider, error)
 	UpdateProvider(ctx context.Context, userID string, provider *types.Provider) (*types.Provider, error)
 	DeleteProvider(ctx context.Context, accountID, userID, providerID string) error
@@ -129,8 +132,27 @@ type managerImpl struct {
 	// state; concurrent provider creates would otherwise race.
 	labelRngMu sync.Mutex
 	labelRng   *rand.Rand
+
+	// discoveryAttempts provides lightweight per-provider admission control for
+	// the explicit endpoint probe. It prevents duplicate clicks from occupying
+	// multiple proxy control-stream requests at once and adds a short cooldown
+	// after each attempt.
+	discoveryMu       sync.Mutex
+	discoveryAttempts map[string]modelDiscoveryAttempt
 }
 
+type modelDiscoveryAttempt struct {
+	inFlight    bool
+	lastStarted time.Time
+}
+
+const (
+	modelDiscoveryTimeout  = 10 * time.Second
+	modelDiscoveryCooldown = 2 * time.Second
+	maxDiscoveredModels    = 500
+	maxDiscoveredModelLen  = 512
+)
+
 // NewManager constructs the persistent Agent Network manager. The
 // manager persists provider/policy/guardrail configuration and, on
 // every mutation, reconciles the in-memory synthesised reverse-proxy
@@ -149,6 +171,7 @@ func NewManager(
 		proxyController:    proxyController,
 		reconcileCache:     make(map[string]map[string]*proto.ProxyMapping),
 		labelRng:           rand.New(rand.NewSource(time.Now().UnixNano())),
+		discoveryAttempts:  make(map[string]modelDiscoveryAttempt),
 	}
 }
 
@@ -166,6 +189,202 @@ func (m *managerImpl) GetProvider(ctx context.Context, accountID, userID, provid
 	return m.store.GetAgentNetworkProviderByID(ctx, store.LockingStrengthNone, accountID, providerID)
 }
 
+// DiscoverProviderModels asks a capable proxy in the account's selected
+// cluster to query the persisted provider endpoint. The browser supplies only
+// the provider id: URL, TLS policy, and credential are loaded here so a caller
+// cannot turn this operation into an arbitrary network probe.
+func (m *managerImpl) DiscoverProviderModels(ctx context.Context, accountID, userID, providerID string) (*types.ModelDiscoveryResult, error) {
+	if err := m.requirePermission(ctx, accountID, userID, operations.Update); err != nil {
+		return nil, err
+	}
+	providerID = strings.TrimSpace(providerID)
+	if providerID == "" {
+		return nil, status.Errorf(status.InvalidArgument, "provider ID is required")
+	}
+
+	provider, err := m.store.GetAgentNetworkProviderByID(ctx, store.LockingStrengthNone, accountID, providerID)
+	if err != nil {
+		return nil, err
+	}
+	entry, ok := catalog.Lookup(provider.ProviderID)
+	if !ok {
+		return nil, status.Errorf(status.PreconditionFailed, "provider references an unknown catalog provider")
+	}
+	if entry.ModelDiscovery == nil {
+		return nil, status.Errorf(status.PreconditionFailed, "provider type %q does not support model discovery", provider.ProviderID)
+	}
+	if m.proxyController == nil {
+		return nil, status.Errorf(status.PreconditionFailed, "model discovery is unavailable")
+	}
+
+	settings, err := m.store.GetAgentNetworkSettings(ctx, store.LockingStrengthNone, accountID)
+	if err != nil {
+		var statusErr *status.Error
+		if errors.As(err, &statusErr) && statusErr.Type() == status.NotFound {
+			return nil, status.Errorf(status.PreconditionFailed, "configure an Agent Network proxy cluster before discovering models")
+		}
+		return nil, err
+	}
+	cluster := strings.TrimSpace(settings.Cluster)
+	if cluster == "" {
+		return nil, status.Errorf(status.PreconditionFailed, "configure an Agent Network proxy cluster before discovering models")
+	}
+
+	authHeaderName, authHeaderValue, gcpKey, err := providerAuthHeader(provider)
+	if err != nil {
+		return nil, status.Errorf(status.PreconditionFailed, "provider authentication is not configured correctly")
+	}
+	if gcpKey != "" {
+		return nil, status.Errorf(status.PreconditionFailed, "provider authentication is not supported for model discovery")
+	}
+
+	attemptKey := accountID + "\x00" + provider.ID
+	if !m.beginModelDiscovery(attemptKey, time.Now()) {
+		return nil, status.Errorf(status.TooManyRequests, "model discovery is already running or was requested too recently")
+	}
+	defer m.finishModelDiscovery(attemptKey)
+
+	probeCtx, cancel := context.WithTimeout(ctx, modelDiscoveryTimeout)
+	defer cancel()
+	probeResult, err := m.proxyController.DiscoverModels(probeCtx, accountID, cluster, &proto.ModelDiscoveryRequest{
+		UpstreamUrl:     strings.TrimSpace(provider.UpstreamURL),
+		AuthHeaderName:  authHeaderName,
+		AuthHeaderValue: authHeaderValue,
+		SkipTlsVerify:   provider.SkipTLSVerification,
+		OllamaFallback:  entry.ModelDiscovery.OllamaFallback,
+	})
+	if err != nil {
+		if errors.Is(err, context.DeadlineExceeded) || errors.Is(probeCtx.Err(), context.DeadlineExceeded) {
+			return nil, status.Errorf(status.PreconditionFailed, "model discovery timed out")
+		}
+		if _, ok := status.FromError(err); ok {
+			return nil, err
+		}
+		return nil, status.Errorf(status.PreconditionFailed, "model discovery could not be completed")
+	}
+	if probeResult == nil {
+		return nil, status.Errorf(status.PreconditionFailed, "proxy returned an empty model discovery response")
+	}
+	if strings.TrimSpace(probeResult.Error) != "" {
+		message := safeModelDiscoveryText(probeResult.Error, 256)
+		if message == "" {
+			message = "proxy reported a discovery failure"
+		}
+		requestID := safeModelDiscoveryText(probeResult.RequestId, 128)
+		if requestID != "" {
+			return nil, status.Errorf(status.PreconditionFailed, "model discovery failed: %s (request_id: %s)", message, requestID)
+		}
+		return nil, status.Errorf(status.PreconditionFailed, "model discovery failed: %s", message)
+	}
+
+	requestID := safeModelDiscoveryText(probeResult.RequestId, 128)
+	if requestID == "" {
+		return nil, status.Errorf(status.PreconditionFailed, "proxy returned an uncorrelated model discovery response")
+	}
+	source := strings.TrimSpace(probeResult.Source)
+	switch source {
+	case "openai_v1_models", "ollama_api_tags":
+	default:
+		return nil, status.Errorf(status.PreconditionFailed, "proxy returned an unsupported model discovery response")
+	}
+
+	return &types.ModelDiscoveryResult{
+		RequestID:    requestID,
+		Source:       source,
+		ProxyCluster: cluster,
+		Models:       normalizeDiscoveredModels(probeResult.Models),
+	}, nil
+}
+
+func (m *managerImpl) beginModelDiscovery(key string, now time.Time) bool {
+	m.discoveryMu.Lock()
+	defer m.discoveryMu.Unlock()
+	if m.discoveryAttempts == nil {
+		m.discoveryAttempts = make(map[string]modelDiscoveryAttempt)
+	}
+	attempt := m.discoveryAttempts[key]
+	if attempt.inFlight || (!attempt.lastStarted.IsZero() && now.Sub(attempt.lastStarted) < modelDiscoveryCooldown) {
+		return false
+	}
+	attempt.inFlight = true
+	attempt.lastStarted = now
+	m.discoveryAttempts[key] = attempt
+	return true
+}
+
+func (m *managerImpl) finishModelDiscovery(key string) {
+	m.discoveryMu.Lock()
+	attempt, ok := m.discoveryAttempts[key]
+	if !ok {
+		m.discoveryMu.Unlock()
+		return
+	}
+	attempt.inFlight = false
+	m.discoveryAttempts[key] = attempt
+	m.discoveryMu.Unlock()
+
+	remaining := time.Until(attempt.lastStarted.Add(modelDiscoveryCooldown))
+	if remaining <= 0 {
+		m.expireModelDiscoveryAttempt(key, attempt.lastStarted)
+		return
+	}
+	time.AfterFunc(remaining, func() {
+		m.expireModelDiscoveryAttempt(key, attempt.lastStarted)
+	})
+}
+
+func (m *managerImpl) expireModelDiscoveryAttempt(key string, lastStarted time.Time) {
+	m.discoveryMu.Lock()
+	defer m.discoveryMu.Unlock()
+	attempt, ok := m.discoveryAttempts[key]
+	if ok && !attempt.inFlight && attempt.lastStarted.Equal(lastStarted) {
+		delete(m.discoveryAttempts, key)
+	}
+}
+
+func normalizeDiscoveredModels(models []*proto.ModelDiscoveryModel) []types.DiscoveredModel {
+	out := make([]types.DiscoveredModel, 0, min(len(models), maxDiscoveredModels))
+	seen := make(map[string]struct{}, min(len(models), maxDiscoveredModels))
+	for _, model := range models {
+		if model == nil {
+			continue
+		}
+		id := safeModelDiscoveryText(model.Id, maxDiscoveredModelLen)
+		if id == "" || len(id) > maxDiscoveredModelLen {
+			continue
+		}
+		if _, ok := seen[id]; ok {
+			continue
+		}
+		label := safeModelDiscoveryText(model.Label, maxDiscoveredModelLen)
+		if label == "" || len(label) > maxDiscoveredModelLen {
+			label = id
+		}
+		seen[id] = struct{}{}
+		out = append(out, types.DiscoveredModel{ID: id, Label: label})
+		if len(out) == maxDiscoveredModels {
+			break
+		}
+	}
+	slices.SortFunc(out, func(a, b types.DiscoveredModel) int {
+		return strings.Compare(a.ID, b.ID)
+	})
+	return out
+}
+
+func safeModelDiscoveryText(value string, maxLen int) string {
+	value = strings.TrimSpace(value)
+	if value == "" || len(value) > maxLen || !utf8.ValidString(value) {
+		return ""
+	}
+	for _, r := range value {
+		if unicode.IsControl(r) {
+			return ""
+		}
+	}
+	return value
+}
+
 // CreateProvider persists a new provider for the account. bootstrapCluster
 // is used only when the per-account agent-network Settings row hasn't
 // been created yet; otherwise it is ignored (the cluster is pinned on
@@ -847,6 +1066,10 @@ func (*mockManager) GetProvider(_ context.Context, _, _, _ string) (*types.Provi
 	return &types.Provider{}, nil
 }
 
+func (*mockManager) DiscoverProviderModels(_ context.Context, _, _, _ string) (*types.ModelDiscoveryResult, error) {
+	return nil, status.Errorf(status.PreconditionFailed, "model discovery is unavailable")
+}
+
 func (*mockManager) CreateProvider(_ context.Context, _ string, p *types.Provider, _ string) (*types.Provider, error) {
 	return p, nil
 }

management/internals/modules/agentnetwork/model_discovery_test.go

@@ -0,0 +1,180 @@
+package agentnetwork
+
+import (
+	"context"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/golang/mock/gomock"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/netbirdio/netbird/management/internals/modules/agentnetwork/types"
+	"github.com/netbirdio/netbird/management/internals/modules/reverseproxy/proxy"
+	"github.com/netbirdio/netbird/management/server/permissions"
+	"github.com/netbirdio/netbird/management/server/permissions/modules"
+	"github.com/netbirdio/netbird/management/server/permissions/operations"
+	"github.com/netbirdio/netbird/management/server/store"
+	"github.com/netbirdio/netbird/shared/management/proto"
+	"github.com/netbirdio/netbird/shared/management/status"
+)
+
+func newModelDiscoveryManager(t *testing.T) (*managerImpl, *store.MockStore, *permissions.MockManager, *proxy.MockController) {
+	t.Helper()
+	ctrl := gomock.NewController(t)
+	mockStore := store.NewMockStore(ctrl)
+	mockPermissions := permissions.NewMockManager(ctrl)
+	mockProxy := proxy.NewMockController(ctrl)
+	return &managerImpl{
+		store:              mockStore,
+		permissionsManager: mockPermissions,
+		proxyController:    mockProxy,
+		discoveryAttempts:  make(map[string]modelDiscoveryAttempt),
+	}, mockStore, mockPermissions, mockProxy
+}
+
+func allowModelDiscovery(mockPermissions *permissions.MockManager) {
+	mockPermissions.EXPECT().
+		ValidateUserPermissions(gomock.Any(), "account-1", "user-1", modules.AgentNetwork, operations.Update).
+		Return(true, context.Background(), nil)
+}
+
+func TestDiscoverProviderModelsUsesPersistedProviderAndCluster(t *testing.T) {
+	manager, mockStore, mockPermissions, mockProxy := newModelDiscoveryManager(t)
+	allowModelDiscovery(mockPermissions)
+
+	provider := &types.Provider{
+		ID:                  "provider-1",
+		AccountID:           "account-1",
+		ProviderID:          "ollama",
+		UpstreamURL:         "http://ollama.internal:11434/base",
+		APIKey:              "stored-key",
+		SkipTLSVerification: true,
+	}
+	mockStore.EXPECT().
+		GetAgentNetworkProviderByID(gomock.Any(), store.LockingStrengthNone, "account-1", "provider-1").
+		Return(provider, nil)
+	mockStore.EXPECT().
+		GetAgentNetworkSettings(gomock.Any(), store.LockingStrengthNone, "account-1").
+		Return(&types.Settings{AccountID: "account-1", Cluster: "private.example.com"}, nil)
+	mockProxy.EXPECT().
+		DiscoverModels(gomock.Any(), "account-1", "private.example.com", gomock.Any()).
+		DoAndReturn(func(_ context.Context, _, _ string, request *proto.ModelDiscoveryRequest) (*proto.ModelDiscoveryResult, error) {
+			assert.Empty(t, request.RequestId, "the control-plane server owns request IDs")
+			assert.Equal(t, provider.UpstreamURL, request.UpstreamUrl)
+			assert.Equal(t, "Authorization", request.AuthHeaderName)
+			assert.Equal(t, "Bearer stored-key", request.AuthHeaderValue)
+			assert.True(t, request.SkipTlsVerify)
+			assert.True(t, request.OllamaFallback)
+			return &proto.ModelDiscoveryResult{
+				RequestId: "probe-123",
+				Source:    "openai_v1_models",
+				Models: []*proto.ModelDiscoveryModel{
+					{Id: "zeta", Label: ""},
+					{Id: "alpha", Label: "Alpha"},
+					{Id: "zeta", Label: "duplicate"},
+					{Id: "bad\x00model", Label: "bad"},
+					{Id: strings.Repeat("x", maxDiscoveredModelLen+1), Label: "too long"},
+				},
+			}, nil
+		})
+
+	result, err := manager.DiscoverProviderModels(context.Background(), "account-1", "user-1", "provider-1")
+	require.NoError(t, err)
+	assert.Equal(t, "probe-123", result.RequestID)
+	assert.Equal(t, "openai_v1_models", result.Source)
+	assert.Equal(t, "private.example.com", result.ProxyCluster)
+	assert.Equal(t, []types.DiscoveredModel{
+		{ID: "alpha", Label: "Alpha"},
+		{ID: "zeta", Label: "zeta"},
+	}, result.Models)
+}
+
+func TestDiscoverProviderModelsRejectsUnsupportedProvider(t *testing.T) {
+	manager, mockStore, mockPermissions, _ := newModelDiscoveryManager(t)
+	allowModelDiscovery(mockPermissions)
+	mockStore.EXPECT().
+		GetAgentNetworkProviderByID(gomock.Any(), store.LockingStrengthNone, "account-1", "provider-1").
+		Return(&types.Provider{
+			ID:         "provider-1",
+			AccountID:  "account-1",
+			ProviderID: "openai_api",
+		}, nil)
+
+	_, err := manager.DiscoverProviderModels(context.Background(), "account-1", "user-1", "provider-1")
+	require.Error(t, err)
+	statusErr, ok := status.FromError(err)
+	require.True(t, ok)
+	assert.Equal(t, status.PreconditionFailed, statusErr.Type())
+	assert.Contains(t, err.Error(), "does not support")
+}
+
+func TestDiscoverProviderModelsPreservesCorrelatedProxyError(t *testing.T) {
+	manager, mockStore, mockPermissions, mockProxy := newModelDiscoveryManager(t)
+	allowModelDiscovery(mockPermissions)
+	mockStore.EXPECT().
+		GetAgentNetworkProviderByID(gomock.Any(), store.LockingStrengthNone, "account-1", "provider-1").
+		Return(&types.Provider{
+			ID:          "provider-1",
+			AccountID:   "account-1",
+			ProviderID:  "ollama",
+			UpstreamURL: "http://ollama.internal:11434",
+		}, nil)
+	mockStore.EXPECT().
+		GetAgentNetworkSettings(gomock.Any(), store.LockingStrengthNone, "account-1").
+		Return(&types.Settings{AccountID: "account-1", Cluster: "private.example.com"}, nil)
+	mockProxy.EXPECT().
+		DiscoverModels(gomock.Any(), "account-1", "private.example.com", gomock.Any()).
+		Return(&proto.ModelDiscoveryResult{
+			RequestId: "probe-failed",
+			Error:     "upstream returned HTTP 401",
+		}, nil)
+
+	_, err := manager.DiscoverProviderModels(context.Background(), "account-1", "user-1", "provider-1")
+	require.Error(t, err)
+	assert.Contains(t, err.Error(), "upstream returned HTTP 401")
+	assert.Contains(t, err.Error(), "probe-failed")
+}
+
+func TestModelDiscoveryAdmissionControl(t *testing.T) {
+	manager := &managerImpl{}
+	start := time.Now()
+	require.True(t, manager.beginModelDiscovery("account/provider", start))
+	assert.False(t, manager.beginModelDiscovery("account/provider", start.Add(time.Second)))
+
+	manager.finishModelDiscovery("account/provider")
+	assert.False(t, manager.beginModelDiscovery("account/provider", start.Add(time.Second)))
+	assert.True(t, manager.beginModelDiscovery("account/provider", start.Add(modelDiscoveryCooldown)))
+}
+
+func TestModelDiscoveryAdmissionControlExpiresFinishedAttempts(t *testing.T) {
+	manager := &managerImpl{}
+	start := time.Now()
+	require.True(t, manager.beginModelDiscovery("account/provider", start))
+	manager.finishModelDiscovery("account/provider")
+
+	manager.expireModelDiscoveryAttempt("account/provider", start)
+
+	manager.discoveryMu.Lock()
+	_, retained := manager.discoveryAttempts["account/provider"]
+	manager.discoveryMu.Unlock()
+	assert.False(t, retained)
+}
+
+func TestModelDiscoveryAdmissionControlKeepsReplacementAttempt(t *testing.T) {
+	manager := &managerImpl{}
+	start := time.Now()
+	require.True(t, manager.beginModelDiscovery("account/provider", start))
+	manager.finishModelDiscovery("account/provider")
+	require.True(t, manager.beginModelDiscovery("account/provider", start.Add(modelDiscoveryCooldown)))
+
+	manager.expireModelDiscoveryAttempt("account/provider", start)
+
+	manager.discoveryMu.Lock()
+	attempt, retained := manager.discoveryAttempts["account/provider"]
+	manager.discoveryMu.Unlock()
+	require.True(t, retained)
+	assert.True(t, attempt.inFlight)
+	assert.Equal(t, start.Add(modelDiscoveryCooldown), attempt.lastStarted)
+}

management/internals/modules/agentnetwork/types/model_discovery.go

@@ -0,0 +1,19 @@
+package types
+
+// DiscoveredModel is a normalized model identifier returned by a provider's
+// persisted upstream endpoint. Discovery does not persist models; the caller
+// must explicitly update the provider to opt into the returned list.
+type DiscoveredModel struct {
+	ID    string
+	Label string
+}
+
+// ModelDiscoveryResult describes a successful proxy-executed discovery probe.
+// RequestID correlates the management request with the proxy control message,
+// and ProxyCluster identifies the network vantage point that ran it.
+type ModelDiscoveryResult struct {
+	RequestID    string
+	Source       string
+	ProxyCluster string
+	Models       []DiscoveredModel
+}

management/internals/modules/reverseproxy/proxy/manager.go

@@ -4,11 +4,16 @@ package proxy
 
 import (
 	"context"
+	"errors"
 	"time"
 
 	"github.com/netbirdio/netbird/shared/management/proto"
 )
 
+// ErrModelDiscoveryUnavailable is returned when no connected proxy in the
+// requested cluster can execute a model-discovery request.
+var ErrModelDiscoveryUnavailable = errors.New("model discovery proxy unavailable")
+
 // Manager defines the interface for proxy operations
 type Manager interface {
 	Connect(ctx context.Context, proxyID, sessionID, clusterAddress, ipAddress string, accountID *string, capabilities *Capabilities) (*Proxy, error)
@@ -38,6 +43,7 @@ type OIDCValidationConfig struct {
 // Controller is responsible for managing proxy clusters and routing service updates.
 type Controller interface {
 	SendServiceUpdateToCluster(ctx context.Context, accountID string, update *proto.ProxyMapping, clusterAddr string)
+	DiscoverModels(ctx context.Context, accountID, clusterAddr string, req *proto.ModelDiscoveryRequest) (*proto.ModelDiscoveryResult, error)
 	GetOIDCValidationConfig() OIDCValidationConfig
 	RegisterProxyToCluster(ctx context.Context, clusterAddr, proxyID string) error
 	UnregisterProxyFromCluster(ctx context.Context, clusterAddr, proxyID string) error

management/internals/modules/reverseproxy/proxy/manager/controller.go

@@ -39,6 +39,12 @@ func (c *GRPCController) SendServiceUpdateToCluster(ctx context.Context, account
 	c.metrics.IncrementServiceUpdateSendCount(clusterAddr)
 }
 
+// DiscoverModels executes a correlated model-discovery request on one capable
+// proxy connected to the requested cluster.
+func (c *GRPCController) DiscoverModels(ctx context.Context, accountID, clusterAddr string, req *proto.ModelDiscoveryRequest) (*proto.ModelDiscoveryResult, error) {
+	return c.proxyGRPCServer.DiscoverModels(ctx, accountID, clusterAddr, req)
+}
+
 // GetOIDCValidationConfig returns the OIDC validation configuration from the gRPC server.
 func (c *GRPCController) GetOIDCValidationConfig() proxy.OIDCValidationConfig {
 	return c.proxyGRPCServer.GetOIDCValidationConfig()
@@ -50,10 +56,12 @@ func (c *GRPCController) RegisterProxyToCluster(ctx context.Context, clusterAddr
 		return nil
 	}
 	proxySet, _ := c.clusterProxies.LoadOrStore(clusterAddr, &sync.Map{})
-	proxySet.(*sync.Map).Store(proxyID, struct{}{})
+	_, alreadyRegistered := proxySet.(*sync.Map).LoadOrStore(proxyID, struct{}{})
 	log.WithContext(ctx).Debugf("Registered proxy %s to cluster %s", proxyID, clusterAddr)
 
-	c.metrics.IncrementProxyConnectionCount(clusterAddr)
+	if !alreadyRegistered {
+		c.metrics.IncrementProxyConnectionCount(clusterAddr)
+	}
 
 	return nil
 }
@@ -64,10 +72,10 @@ func (c *GRPCController) UnregisterProxyFromCluster(ctx context.Context, cluster
 		return nil
 	}
 	if proxySet, ok := c.clusterProxies.Load(clusterAddr); ok {
-		proxySet.(*sync.Map).Delete(proxyID)
-		log.WithContext(ctx).Debugf("Unregistered proxy %s from cluster %s", proxyID, clusterAddr)
-
-		c.metrics.DecrementProxyConnectionCount(clusterAddr)
+		if _, registered := proxySet.(*sync.Map).LoadAndDelete(proxyID); registered {
+			log.WithContext(ctx).Debugf("Unregistered proxy %s from cluster %s", proxyID, clusterAddr)
+			c.metrics.DecrementProxyConnectionCount(clusterAddr)
+		}
 	}
 	return nil
 }

management/internals/modules/reverseproxy/proxy/manager_mock.go

@@ -259,6 +259,21 @@ func (m *MockController) EXPECT() *MockControllerMockRecorder {
 	return m.recorder
 }
 
+// DiscoverModels mocks base method.
+func (m *MockController) DiscoverModels(ctx context.Context, accountID, clusterAddr string, req *proto.ModelDiscoveryRequest) (*proto.ModelDiscoveryResult, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "DiscoverModels", ctx, accountID, clusterAddr, req)
+	ret0, _ := ret[0].(*proto.ModelDiscoveryResult)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// DiscoverModels indicates an expected call of DiscoverModels.
+func (mr *MockControllerMockRecorder) DiscoverModels(ctx, accountID, clusterAddr, req interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "DiscoverModels", reflect.TypeOf((*MockController)(nil).DiscoverModels), ctx, accountID, clusterAddr, req)
+}
+
 // GetOIDCValidationConfig mocks base method.
 func (m *MockController) GetOIDCValidationConfig() OIDCValidationConfig {
 	m.ctrl.T.Helper()

management/internals/shared/grpc/model_discovery_test.go

@@ -0,0 +1,404 @@
+package grpc
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	rpproxy "github.com/netbirdio/netbird/management/internals/modules/reverseproxy/proxy"
+	"github.com/netbirdio/netbird/shared/management/proto"
+	nbstatus "github.com/netbirdio/netbird/shared/management/status"
+)
+
+type modelDiscoveryCall struct {
+	result *proto.ModelDiscoveryResult
+	err    error
+}
+
+func newModelDiscoveryTestServer(t *testing.T) (*ProxyServiceServer, *testProxyController) {
+	t.Helper()
+	controller := newTestProxyController()
+	server := &ProxyServiceServer{
+		proxyController:       controller,
+		modelDiscoveryPending: make(map[string]*pendingModelDiscovery),
+	}
+	return server, controller
+}
+
+func addModelDiscoveryTestConnection(
+	t *testing.T,
+	server *ProxyServiceServer,
+	controller *testProxyController,
+	proxyID, sessionID, cluster string,
+	accountID *string,
+	supportsDiscovery bool,
+) (*proxyConnection, context.CancelFunc) {
+	t.Helper()
+	ctx, cancel := context.WithCancel(context.Background())
+	ready := make(chan struct{})
+	close(ready)
+	conn := &proxyConnection{
+		proxyID:   proxyID,
+		sessionID: sessionID,
+		address:   cluster,
+		accountID: accountID,
+		capabilities: &proto.ProxyCapabilities{
+			SupportsModelDiscovery: &supportsDiscovery,
+		},
+		syncStream:         &syncRecordingStream{},
+		modelDiscoveryChan: make(chan *proto.ModelDiscoveryRequest, modelDiscoveryQueueSize),
+		ready:              ready,
+		ctx:                ctx,
+		cancel:             cancel,
+	}
+	server.connectedProxies.Store(proxyID, conn)
+	require.NoError(t, controller.RegisterProxyToCluster(context.Background(), cluster, proxyID))
+	t.Cleanup(func() {
+		cancel()
+		server.connectedProxies.Delete(proxyID)
+		_ = controller.UnregisterProxyFromCluster(context.Background(), cluster, proxyID)
+	})
+	return conn, cancel
+}
+
+func callDiscoverModels(
+	server *ProxyServiceServer,
+	ctx context.Context,
+	accountID, cluster string,
+	req *proto.ModelDiscoveryRequest,
+) <-chan modelDiscoveryCall {
+	done := make(chan modelDiscoveryCall, 1)
+	go func() {
+		result, err := server.DiscoverModels(ctx, accountID, cluster, req)
+		done <- modelDiscoveryCall{result: result, err: err}
+	}()
+	return done
+}
+
+func TestDiscoverModels_CorrelatesResultAndCopiesSensitiveRequest(t *testing.T) {
+	server, controller := newModelDiscoveryTestServer(t)
+	conn, _ := addModelDiscoveryTestConnection(
+		t, server, controller, "proxy-a", "session-a", "cluster.example.com", nil, true,
+	)
+
+	callerReq := &proto.ModelDiscoveryRequest{
+		RequestId:       "caller-controlled",
+		UpstreamUrl:     "http://ollama.internal:11434",
+		AuthHeaderName:  "Authorization",
+		AuthHeaderValue: "Bearer secret",
+		SkipTlsVerify:   true,
+		OllamaFallback:  true,
+	}
+	done := callDiscoverModels(server, context.Background(), "account-a", "cluster.example.com", callerReq)
+
+	wireReq := <-conn.modelDiscoveryChan
+	assert.NotEmpty(t, wireReq.GetRequestId())
+	assert.NotEqual(t, callerReq.GetRequestId(), wireReq.GetRequestId(), "management must own correlation IDs")
+	assert.Equal(t, callerReq.GetUpstreamUrl(), wireReq.GetUpstreamUrl())
+	assert.Equal(t, callerReq.GetAuthHeaderName(), wireReq.GetAuthHeaderName())
+	assert.Equal(t, callerReq.GetAuthHeaderValue(), wireReq.GetAuthHeaderValue())
+	assert.Equal(t, callerReq.GetSkipTlsVerify(), wireReq.GetSkipTlsVerify())
+	assert.Equal(t, callerReq.GetOllamaFallback(), wireReq.GetOllamaFallback())
+	assert.Equal(t, "caller-controlled", callerReq.GetRequestId(), "caller request must not be mutated")
+
+	want := &proto.ModelDiscoveryResult{
+		RequestId: wireReq.GetRequestId(),
+		Models: []*proto.ModelDiscoveryModel{
+			{Id: "llama3.2:latest", Label: "llama3.2:latest"},
+		},
+		Source: "openai_v1_models",
+	}
+	server.completeModelDiscovery(conn, want)
+
+	got := <-done
+	require.NoError(t, got.err)
+	assert.Equal(t, want, got.result)
+}
+
+func TestDiscoverModels_IgnoresMismatchedCorrelation(t *testing.T) {
+	server, controller := newModelDiscoveryTestServer(t)
+	conn, _ := addModelDiscoveryTestConnection(
+		t, server, controller, "proxy-a", "session-a", "cluster.example.com", nil, true,
+	)
+
+	done := callDiscoverModels(server, context.Background(), "account-a", "cluster.example.com", &proto.ModelDiscoveryRequest{
+		UpstreamUrl: "http://ollama.internal:11434",
+	})
+	wireReq := <-conn.modelDiscoveryChan
+
+	server.completeModelDiscovery(conn, &proto.ModelDiscoveryResult{RequestId: "wrong-request"})
+	select {
+	case got := <-done:
+		t.Fatalf("mismatched request completed discovery: %+v", got)
+	default:
+	}
+
+	wrongSession := *conn
+	wrongSession.sessionID = "session-b"
+	server.completeModelDiscovery(&wrongSession, &proto.ModelDiscoveryResult{RequestId: wireReq.GetRequestId()})
+	select {
+	case got := <-done:
+		t.Fatalf("mismatched proxy session completed discovery: %+v", got)
+	default:
+	}
+
+	server.completeModelDiscovery(conn, &proto.ModelDiscoveryResult{RequestId: wireReq.GetRequestId()})
+	got := <-done
+	require.NoError(t, got.err)
+	require.NotNil(t, got.result)
+}
+
+func TestDiscoverModels_ReturnsProxyReportedErrorForManagerContext(t *testing.T) {
+	server, controller := newModelDiscoveryTestServer(t)
+	conn, _ := addModelDiscoveryTestConnection(
+		t, server, controller, "proxy-a", "session-a", "cluster.example.com", nil, true,
+	)
+
+	done := callDiscoverModels(server, context.Background(), "account-a", "cluster.example.com", &proto.ModelDiscoveryRequest{
+		UpstreamUrl: "http://ollama.internal:11434",
+	})
+	wireReq := <-conn.modelDiscoveryChan
+	server.completeModelDiscovery(conn, &proto.ModelDiscoveryResult{
+		RequestId: wireReq.GetRequestId(),
+		Error:     "upstream returned HTTP 401",
+	})
+
+	got := <-done
+	require.NoError(t, got.err)
+	require.NotNil(t, got.result)
+	assert.Equal(t, "upstream returned HTTP 401", got.result.GetError())
+	assert.Equal(t, wireReq.GetRequestId(), got.result.GetRequestId())
+}
+
+func TestDiscoverModels_FiltersCapabilityAndAccountScope(t *testing.T) {
+	tests := []struct {
+		name              string
+		connectionAccount *string
+		requestAccount    string
+		supported         bool
+	}{
+		{
+			name:           "capability absent",
+			requestAccount: "account-a",
+			supported:      false,
+		},
+		{
+			name:              "BYOP account mismatch",
+			connectionAccount: stringPointer("account-b"),
+			requestAccount:    "account-a",
+			supported:         true,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			server, controller := newModelDiscoveryTestServer(t)
+			addModelDiscoveryTestConnection(
+				t, server, controller, "proxy-a", "session-a", "cluster.example.com",
+				tt.connectionAccount, tt.supported,
+			)
+
+			result, err := server.DiscoverModels(
+				context.Background(),
+				tt.requestAccount,
+				"cluster.example.com",
+				&proto.ModelDiscoveryRequest{UpstreamUrl: "http://ollama.internal:11434"},
+			)
+			require.Nil(t, result)
+			requireStatusType(t, err, nbstatus.PreconditionFailed)
+		})
+	}
+}
+
+func TestDiscoverModels_RejectsStaleClusterMembershipAfterReconnect(t *testing.T) {
+	server, controller := newModelDiscoveryTestServer(t)
+	conn, _ := addModelDiscoveryTestConnection(
+		t, server, controller, "proxy-a", "new-session", "new-cluster.example.com", nil, true,
+	)
+	// Simulate the stale membership left behind when this proxy ID previously
+	// connected to another cluster and that superseded session skipped cleanup.
+	require.NoError(t, controller.RegisterProxyToCluster(
+		context.Background(),
+		"old-cluster.example.com",
+		"proxy-a",
+	))
+
+	result, err := server.DiscoverModels(
+		context.Background(),
+		"account-a",
+		"old-cluster.example.com",
+		&proto.ModelDiscoveryRequest{UpstreamUrl: "http://ollama.internal:11434"},
+	)
+
+	require.Nil(t, result)
+	requireStatusType(t, err, nbstatus.PreconditionFailed)
+	select {
+	case request := <-conn.modelDiscoveryChan:
+		t.Fatalf("sent credentials to connection in a different cluster: %+v", request)
+	default:
+	}
+}
+
+func TestDiscoverModels_CancelAndDisconnectCleanPendingRequest(t *testing.T) {
+	t.Run("caller cancellation", func(t *testing.T) {
+		server, controller := newModelDiscoveryTestServer(t)
+		conn, _ := addModelDiscoveryTestConnection(
+			t, server, controller, "proxy-a", "session-a", "cluster.example.com", nil, true,
+		)
+		ctx, cancel := context.WithCancel(context.Background())
+		done := callDiscoverModels(server, ctx, "account-a", "cluster.example.com", &proto.ModelDiscoveryRequest{
+			UpstreamUrl: "http://ollama.internal:11434",
+		})
+		<-conn.modelDiscoveryChan
+		cancel()
+
+		got := <-done
+		require.Nil(t, got.result)
+		requireStatusType(t, got.err, nbstatus.PreconditionFailed)
+		assert.Empty(t, server.modelDiscoveryPending)
+	})
+
+	t.Run("proxy disconnect", func(t *testing.T) {
+		server, controller := newModelDiscoveryTestServer(t)
+		conn, _ := addModelDiscoveryTestConnection(
+			t, server, controller, "proxy-a", "session-a", "cluster.example.com", nil, true,
+		)
+		done := callDiscoverModels(server, context.Background(), "account-a", "cluster.example.com", &proto.ModelDiscoveryRequest{
+			UpstreamUrl: "http://ollama.internal:11434",
+		})
+		<-conn.modelDiscoveryChan
+		server.failModelDiscoveries(conn, rpproxy.ErrModelDiscoveryUnavailable)
+
+		got := <-done
+		require.Nil(t, got.result)
+		requireStatusType(t, got.err, nbstatus.PreconditionFailed)
+		assert.Empty(t, server.modelDiscoveryPending)
+	})
+}
+
+func TestDiscoverModels_UsesNextCapableProxyWhenFirstQueueIsFull(t *testing.T) {
+	server, controller := newModelDiscoveryTestServer(t)
+	first, _ := addModelDiscoveryTestConnection(
+		t, server, controller, "proxy-a", "session-a", "cluster.example.com", nil, true,
+	)
+	second, _ := addModelDiscoveryTestConnection(
+		t, server, controller, "proxy-b", "session-b", "cluster.example.com", nil, true,
+	)
+	first.modelDiscoveryChan = make(chan *proto.ModelDiscoveryRequest, 1)
+	first.modelDiscoveryChan <- &proto.ModelDiscoveryRequest{RequestId: "occupied"}
+
+	done := callDiscoverModels(server, context.Background(), "account-a", "cluster.example.com", &proto.ModelDiscoveryRequest{
+		UpstreamUrl: "http://ollama.internal:11434",
+	})
+	wireReq := <-second.modelDiscoveryChan
+	server.completeModelDiscovery(second, &proto.ModelDiscoveryResult{RequestId: wireReq.GetRequestId()})
+
+	got := <-done
+	require.NoError(t, got.err)
+	require.NotNil(t, got.result)
+}
+
+func TestSenderSkipsCanceledQueuedModelDiscovery(t *testing.T) {
+	server, controller := newModelDiscoveryTestServer(t)
+	conn, _ := addModelDiscoveryTestConnection(
+		t, server, controller, "proxy-a", "session-a", "cluster.example.com", nil, true,
+	)
+	stream := conn.syncStream.(*syncRecordingStream)
+
+	ctx, cancel := context.WithCancel(context.Background())
+	done := callDiscoverModels(server, ctx, "account-a", "cluster.example.com", &proto.ModelDiscoveryRequest{
+		UpstreamUrl: "http://ollama.internal:11434",
+	})
+	require.Eventually(t, func() bool {
+		return len(conn.modelDiscoveryChan) == 1
+	}, time.Second, time.Millisecond)
+	cancel()
+	got := <-done
+	require.Nil(t, got.result)
+	requireStatusType(t, got.err, nbstatus.PreconditionFailed)
+
+	liveRequest := &proto.ModelDiscoveryRequest{RequestId: "live-request"}
+	livePending := &pendingModelDiscovery{
+		proxyID:   conn.proxyID,
+		sessionID: conn.sessionID,
+		done:      make(chan modelDiscoveryCompletion, 1),
+	}
+	server.registerModelDiscovery(liveRequest.GetRequestId(), livePending)
+	defer server.removeModelDiscovery(liveRequest.GetRequestId(), livePending)
+	conn.modelDiscoveryChan <- liveRequest
+
+	errCh := make(chan error, 1)
+	go server.sender(conn, errCh)
+	require.Eventually(t, func() bool {
+		stream.mu.Lock()
+		defer stream.mu.Unlock()
+		return len(stream.sent) == 1
+	}, time.Second, time.Millisecond)
+
+	stream.mu.Lock()
+	sent := append([]*proto.SyncMappingsResponse(nil), stream.sent...)
+	stream.mu.Unlock()
+	require.Len(t, sent, 1)
+	assert.Equal(t, "live-request", sent[0].GetModelDiscoveryRequest().GetRequestId())
+}
+
+func TestDrainRecv_DispatchesModelDiscoveryResult(t *testing.T) {
+	server, _ := newModelDiscoveryTestServer(t)
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	conn := &proxyConnection{
+		proxyID:   "proxy-a",
+		sessionID: "session-a",
+		ctx:       ctx,
+		cancel:    cancel,
+	}
+	pending := &pendingModelDiscovery{
+		proxyID:   conn.proxyID,
+		sessionID: conn.sessionID,
+		done:      make(chan modelDiscoveryCompletion, 1),
+	}
+	server.registerModelDiscovery("request-a", pending)
+	stream := &syncRecordingStream{
+		recvMsgs: []*proto.SyncMappingsRequest{
+			{
+				Msg: &proto.SyncMappingsRequest_ModelDiscoveryResult{
+					ModelDiscoveryResult: &proto.ModelDiscoveryResult{RequestId: "request-a"},
+				},
+			},
+		},
+	}
+	errCh := make(chan error, 1)
+
+	go server.drainRecv(conn, stream, errCh)
+
+	completion := <-pending.done
+	require.NoError(t, completion.err)
+	require.NotNil(t, completion.result)
+	assert.Equal(t, "request-a", completion.result.GetRequestId())
+}
+
+func TestSendModelDiscoveryRequest_UsesOutOfBandSyncField(t *testing.T) {
+	stream := &syncRecordingStream{}
+	conn := &proxyConnection{syncStream: stream}
+	req := &proto.ModelDiscoveryRequest{RequestId: "request-a"}
+
+	require.NoError(t, conn.sendModelDiscoveryRequest(req))
+	require.Len(t, stream.sent, 1)
+	assert.Empty(t, stream.sent[0].GetMapping())
+	assert.Equal(t, req, stream.sent[0].GetModelDiscoveryRequest())
+}
+
+func stringPointer(value string) *string {
+	return &value
+}
+
+func requireStatusType(t *testing.T, err error, want nbstatus.Type) {
+	t.Helper()
+	require.Error(t, err)
+	statusErr, ok := nbstatus.FromError(err)
+	require.True(t, ok)
+	assert.Equal(t, want, statusErr.Type())
+}

management/internals/shared/grpc/proxy.go

@@ -15,6 +15,7 @@ import (
 	"net/http"
 	"net/url"
 	"os"
+	"sort"
 	"strconv"
 	"strings"
 	"sync"
@@ -29,6 +30,7 @@ import (
 
 	"github.com/netbirdio/netbird/shared/management/domain"
 
+	"github.com/netbirdio/netbird/management/internals/modules/agentnetwork"
 	"github.com/netbirdio/netbird/management/internals/modules/peers"
 	"github.com/netbirdio/netbird/management/internals/modules/reverseproxy/accesslogs"
 	"github.com/netbirdio/netbird/management/internals/modules/reverseproxy/proxy"
@@ -36,7 +38,6 @@ import (
 	"github.com/netbirdio/netbird/management/internals/modules/reverseproxy/sessionkey"
 	"github.com/netbirdio/netbird/management/server/idp"
 	"github.com/netbirdio/netbird/management/server/peer"
-	"github.com/netbirdio/netbird/management/internals/modules/agentnetwork"
 	"github.com/netbirdio/netbird/management/server/types"
 	"github.com/netbirdio/netbird/management/server/users"
 	proxyauth "github.com/netbirdio/netbird/proxy/auth"
@@ -84,6 +85,10 @@ type ProxyServiceServer struct {
 
 	// Map of connected proxies: proxy_id -> proxy connection
 	connectedProxies sync.Map
+	// modelDiscoveryPending correlates out-of-band model-discovery results
+	// received on SyncMappings with the management request waiting for them.
+	modelDiscoveryMu      sync.Mutex
+	modelDiscoveryPending map[string]*pendingModelDiscovery
 
 	// Manager for access logs
 	accessLogManager accesslogs.Manager
@@ -143,6 +148,8 @@ const defaultProxyTokenTTL = 5 * time.Minute
 
 const defaultSnapshotBatchSize = 500
 
+const modelDiscoveryQueueSize = 16
+
 func snapshotBatchSizeFromEnv() int {
 	if v := os.Getenv("NB_PROXY_SNAPSHOT_BATCH_SIZE"); v != "" {
 		if n, err := strconv.Atoi(v); err == nil && n > 0 {
@@ -171,10 +178,26 @@ type proxyConnection struct {
 	stream       proto.ProxyService_GetMappingUpdateServer
 	// syncStream is set when the proxy connected via SyncMappings.
 	// When non-nil, the sender goroutine uses this instead of stream.
-	syncStream proto.ProxyService_SyncMappingsServer
-	sendChan   chan *proto.GetMappingUpdateResponse
-	ctx        context.Context
-	cancel     context.CancelFunc
+	syncStream         proto.ProxyService_SyncMappingsServer
+	sendChan           chan *proto.GetMappingUpdateResponse
+	modelDiscoveryChan chan *proto.ModelDiscoveryRequest
+	// ready closes after the initial snapshot completes and the sender
+	// goroutine is about to start. Discovery never competes with snapshot
+	// delivery on the stream.
+	ready  chan struct{}
+	ctx    context.Context
+	cancel context.CancelFunc
+}
+
+type modelDiscoveryCompletion struct {
+	result *proto.ModelDiscoveryResult
+	err    error
+}
+
+type pendingModelDiscovery struct {
+	proxyID   string
+	sessionID string
+	done      chan modelDiscoveryCompletion
 }
 
 func enforceAccountScope(ctx context.Context, requestAccountID string) error {
@@ -192,17 +215,18 @@ func enforceAccountScope(ctx context.Context, requestAccountID string) error {
 func NewProxyServiceServer(accessLogMgr accesslogs.Manager, tokenStore *OneTimeTokenStore, pkceStore *PKCEVerifierStore, oidcConfig ProxyOIDCConfig, peersManager peers.Manager, usersManager users.Manager, idpManager idp.Manager, proxyMgr proxy.Manager, tokenChecker ProxyTokenChecker) *ProxyServiceServer {
 	ctx, cancel := context.WithCancel(context.Background())
 	s := &ProxyServiceServer{
-		accessLogManager:  accessLogMgr,
-		oidcConfig:        oidcConfig,
-		tokenStore:        tokenStore,
-		pkceVerifierStore: pkceStore,
-		peersManager:      peersManager,
-		usersManager:      usersManager,
-		idpManager:        idpManager,
-		proxyManager:      proxyMgr,
-		tokenChecker:      tokenChecker,
-		snapshotBatchSize: snapshotBatchSizeFromEnv(),
-		cancel:            cancel,
+		accessLogManager:      accessLogMgr,
+		oidcConfig:            oidcConfig,
+		tokenStore:            tokenStore,
+		pkceVerifierStore:     pkceStore,
+		peersManager:          peersManager,
+		usersManager:          usersManager,
+		idpManager:            idpManager,
+		proxyManager:          proxyMgr,
+		tokenChecker:          tokenChecker,
+		snapshotBatchSize:     snapshotBatchSizeFromEnv(),
+		modelDiscoveryPending: make(map[string]*pendingModelDiscovery),
+		cancel:                cancel,
 	}
 	go s.cleanupStaleProxies(ctx)
 	return s
@@ -392,6 +416,7 @@ func (s *ProxyServiceServer) GetMappingUpdate(req *proto.GetMappingUpdateRequest
 		return fmt.Errorf("send snapshot to proxy %s: %w", params.proxyID, err)
 	}
 
+	close(conn.ready)
 	errChan := make(chan error, 2)
 	go s.sender(conn, errChan)
 
@@ -425,9 +450,10 @@ func (s *ProxyServiceServer) SyncMappings(stream proto.ProxyService_SyncMappings
 		return fmt.Errorf("send snapshot to proxy %s: %w", params.proxyID, err)
 	}
 
+	close(conn.ready)
 	errChan := make(chan error, 2)
 	go s.sender(conn, errChan)
-	go s.drainRecv(stream, errChan)
+	go s.drainRecv(conn, stream, errChan)
 
 	return s.serveProxyConnection(conn, proxyRecord, errChan, true)
 }
@@ -496,6 +522,8 @@ func (s *ProxyServiceServer) registerProxyConnection(ctx context.Context, params
 	connSeed.tokenID = tokenID
 	connSeed.capabilities = params.capabilities
 	connSeed.sendChan = make(chan *proto.GetMappingUpdateResponse, 100)
+	connSeed.modelDiscoveryChan = make(chan *proto.ModelDiscoveryRequest, modelDiscoveryQueueSize)
+	connSeed.ready = make(chan struct{})
 	connSeed.ctx = connCtx
 	connSeed.cancel = cancel
 
@@ -543,10 +571,13 @@ func (s *ProxyServiceServer) supersedePriorConnection(proxyID, newSessionID stri
 // cleanupFailedSnapshot removes the connection from the cluster and store
 // after a snapshot send failure.
 func (s *ProxyServiceServer) cleanupFailedSnapshot(ctx context.Context, conn *proxyConnection) {
+	s.failModelDiscoveries(conn, proxy.ErrModelDiscoveryUnavailable)
 	if s.connectedProxies.CompareAndDelete(conn.proxyID, conn) {
 		if err := s.proxyController.UnregisterProxyFromCluster(context.Background(), conn.address, conn.proxyID); err != nil {
 			log.WithContext(ctx).Debugf("cleanup after snapshot failure for proxy %s: %v", conn.proxyID, err)
 		}
+	} else {
+		s.unregisterSupersededProxyCluster(ctx, conn)
 	}
 	conn.cancel()
 	if err := s.proxyManager.Disconnect(context.Background(), conn.proxyID, conn.sessionID); err != nil {
@@ -554,15 +585,19 @@ func (s *ProxyServiceServer) cleanupFailedSnapshot(ctx context.Context, conn *pr
 	}
 }
 
-// drainRecv consumes and discards messages from a bidirectional stream.
-// The proxy sends an ack for every incremental update; we don't need them
-// after the snapshot phase. Recv errors are forwarded to errChan.
-func (s *ProxyServiceServer) drainRecv(stream proto.ProxyService_SyncMappingsServer, errChan chan<- error) {
+// drainRecv consumes post-snapshot messages from a bidirectional stream.
+// Incremental mapping acks need no action; model-discovery results are
+// dispatched to the correlated management caller.
+func (s *ProxyServiceServer) drainRecv(conn *proxyConnection, stream proto.ProxyService_SyncMappingsServer, errChan chan<- error) {
 	for {
-		if _, err := stream.Recv(); err != nil {
+		msg, err := stream.Recv()
+		if err != nil {
 			errChan <- err
 			return
 		}
+		if result := msg.GetModelDiscoveryResult(); result != nil {
+			s.completeModelDiscovery(conn, result)
+		}
 	}
 }
 
@@ -599,7 +634,9 @@ func (s *ProxyServiceServer) serveProxyConnection(conn *proxyConnection, proxyRe
 // disconnectProxy removes the connection from cluster and store, unless it
 // has already been superseded by a newer connection.
 func (s *ProxyServiceServer) disconnectProxy(conn *proxyConnection) {
+	s.failModelDiscoveries(conn, proxy.ErrModelDiscoveryUnavailable)
 	if !s.connectedProxies.CompareAndDelete(conn.proxyID, conn) {
+		s.unregisterSupersededProxyCluster(context.Background(), conn)
 		log.Infof("Proxy %s session %s: skipping cleanup, superseded by new connection", conn.proxyID, conn.sessionID)
 		conn.cancel()
 		return
@@ -616,6 +653,26 @@ func (s *ProxyServiceServer) disconnectProxy(conn *proxyConnection) {
 	log.Infof("Proxy %s session %s disconnected", conn.proxyID, conn.sessionID)
 }
 
+// unregisterSupersededProxyCluster removes membership owned only by an old
+// session after the same proxy ID reconnects at a different address. When the
+// address is unchanged, the membership is shared with the replacement and
+// must remain registered.
+func (s *ProxyServiceServer) unregisterSupersededProxyCluster(ctx context.Context, conn *proxyConnection) {
+	if conn == nil || s.proxyController == nil {
+		return
+	}
+	currentValue, ok := s.connectedProxies.Load(conn.proxyID)
+	if ok {
+		current := currentValue.(*proxyConnection)
+		if current == conn || current.address == conn.address {
+			return
+		}
+	}
+	if err := s.proxyController.UnregisterProxyFromCluster(ctx, conn.address, conn.proxyID); err != nil {
+		log.WithContext(ctx).Debugf("cleanup superseded cluster membership for proxy %s: %v", conn.proxyID, err)
+	}
+}
+
 // sendSnapshotSync sends the initial snapshot with back-pressure: it sends
 // one batch, then waits for the proxy to ack before sending the next.
 func (s *ProxyServiceServer) sendSnapshotSync(ctx context.Context, conn *proxyConnection, stream proto.ProxyService_SyncMappingsServer) error {
@@ -852,6 +909,20 @@ func (s *ProxyServiceServer) sender(conn *proxyConnection, errChan chan<- error)
 				return
 			}
 			log.WithContext(conn.ctx).Tracef("Send response to proxy %s", conn.proxyID)
+		case req := <-conn.modelDiscoveryChan:
+			// The API caller may have timed out while this request waited
+			// behind other stream work. Pending correlation is removed on
+			// cancellation, so skip stale probes before they reach the
+			// proxy and expose a stored credential unnecessarily.
+			if !s.isModelDiscoveryPendingFor(conn, req.GetRequestId()) {
+				continue
+			}
+			if err := conn.sendModelDiscoveryRequest(req); err != nil {
+				errChan <- err
+				log.WithContext(conn.ctx).Tracef("Failed to send model discovery request to proxy %s: %v", conn.proxyID, err)
+				return
+			}
+			log.WithContext(conn.ctx).Tracef("Sent model discovery request to proxy %s", conn.proxyID)
 		case <-conn.ctx.Done():
 			return
 		}
@@ -869,6 +940,15 @@ func (conn *proxyConnection) sendResponse(resp *proto.GetMappingUpdateResponse)
 	return conn.stream.Send(resp)
 }
 
+func (conn *proxyConnection) sendModelDiscoveryRequest(req *proto.ModelDiscoveryRequest) error {
+	if conn.syncStream == nil {
+		return proxy.ErrModelDiscoveryUnavailable
+	}
+	return conn.syncStream.Send(&proto.SyncMappingsResponse{
+		ModelDiscoveryRequest: req,
+	})
+}
+
 // SendAccessLog processes access log from proxy
 func (s *ProxyServiceServer) SendAccessLog(ctx context.Context, req *proto.SendAccessLogRequest) (*proto.SendAccessLogResponse, error) {
 	accessLog := req.GetLog()
@@ -1017,6 +1097,181 @@ func (s *ProxyServiceServer) GetConnectedProxyURLs() []string {
 	return urls
 }
 
+// DiscoverModels sends one correlated model-discovery request to a capable
+// proxy in clusterAddr and waits for its result. Only the stored connection's
+// cluster/account scope is used for routing; no routing identity is carried in
+// the request delivered to the proxy.
+func (s *ProxyServiceServer) DiscoverModels(ctx context.Context, accountID, clusterAddr string, req *proto.ModelDiscoveryRequest) (*proto.ModelDiscoveryResult, error) {
+	if req == nil {
+		return nil, nbstatus.Errorf(nbstatus.InvalidArgument, "model discovery request is required")
+	}
+	if strings.TrimSpace(accountID) == "" {
+		return nil, nbstatus.Errorf(nbstatus.InvalidArgument, "account ID is required for model discovery")
+	}
+	if strings.TrimSpace(clusterAddr) == "" {
+		return nil, nbstatus.Errorf(nbstatus.PreconditionFailed, "agent network proxy cluster is not configured")
+	}
+	if s.proxyController == nil {
+		return nil, nbstatus.Errorf(nbstatus.PreconditionFailed, "model discovery is unavailable for the configured proxy cluster")
+	}
+
+	proxyIDs := s.proxyController.GetProxiesForCluster(clusterAddr)
+	sort.Strings(proxyIDs)
+
+	request := &proto.ModelDiscoveryRequest{
+		RequestId:       uuid.NewString(),
+		UpstreamUrl:     req.GetUpstreamUrl(),
+		AuthHeaderName:  req.GetAuthHeaderName(),
+		AuthHeaderValue: req.GetAuthHeaderValue(),
+		SkipTlsVerify:   req.GetSkipTlsVerify(),
+		OllamaFallback:  req.GetOllamaFallback(),
+	}
+
+	for _, proxyID := range proxyIDs {
+		connVal, ok := s.connectedProxies.Load(proxyID)
+		if !ok {
+			continue
+		}
+		conn := connVal.(*proxyConnection)
+		// Cluster membership can briefly retain a proxy ID from a superseded
+		// session. The live connection is authoritative: never send provider
+		// credentials unless it is connected to the exact requested cluster.
+		if conn.address != clusterAddr {
+			continue
+		}
+		if !modelDiscoveryCapable(conn, accountID) {
+			continue
+		}
+
+		pending := &pendingModelDiscovery{
+			proxyID:   conn.proxyID,
+			sessionID: conn.sessionID,
+			done:      make(chan modelDiscoveryCompletion, 1),
+		}
+		s.registerModelDiscovery(request.GetRequestId(), pending)
+
+		queued := false
+		select {
+		case conn.modelDiscoveryChan <- request:
+			queued = true
+		case <-ctx.Done():
+			s.removeModelDiscovery(request.GetRequestId(), pending)
+			return nil, modelDiscoveryContextError(ctx.Err())
+		default:
+			s.removeModelDiscovery(request.GetRequestId(), pending)
+		}
+		if !queued {
+			continue
+		}
+
+		defer s.removeModelDiscovery(request.GetRequestId(), pending)
+		select {
+		case completion := <-pending.done:
+			if completion.err != nil {
+				return nil, nbstatus.Errorf(nbstatus.PreconditionFailed, "model discovery proxy disconnected")
+			}
+			return completion.result, nil
+		case <-ctx.Done():
+			return nil, modelDiscoveryContextError(ctx.Err())
+		case <-conn.ctx.Done():
+			return nil, nbstatus.Errorf(nbstatus.PreconditionFailed, "model discovery proxy disconnected")
+		}
+	}
+
+	return nil, nbstatus.Errorf(nbstatus.PreconditionFailed, "no connected proxy in the configured cluster supports model discovery")
+}
+
+func modelDiscoveryCapable(conn *proxyConnection, accountID string) bool {
+	if conn == nil || conn.syncStream == nil || conn.modelDiscoveryChan == nil || conn.ready == nil {
+		return false
+	}
+	if conn.ctx == nil || conn.ctx.Err() != nil {
+		return false
+	}
+	if conn.accountID != nil && *conn.accountID != accountID {
+		return false
+	}
+	if conn.capabilities == nil || !conn.capabilities.GetSupportsModelDiscovery() {
+		return false
+	}
+	select {
+	case <-conn.ready:
+		return true
+	default:
+		return false
+	}
+}
+
+func modelDiscoveryContextError(err error) error {
+	if errors.Is(err, context.DeadlineExceeded) {
+		return nbstatus.Errorf(nbstatus.PreconditionFailed, "model discovery timed out")
+	}
+	return nbstatus.Errorf(nbstatus.PreconditionFailed, "model discovery was canceled")
+}
+
+func (s *ProxyServiceServer) registerModelDiscovery(requestID string, pending *pendingModelDiscovery) {
+	s.modelDiscoveryMu.Lock()
+	defer s.modelDiscoveryMu.Unlock()
+	if s.modelDiscoveryPending == nil {
+		s.modelDiscoveryPending = make(map[string]*pendingModelDiscovery)
+	}
+	s.modelDiscoveryPending[requestID] = pending
+}
+
+func (s *ProxyServiceServer) removeModelDiscovery(requestID string, pending *pendingModelDiscovery) {
+	s.modelDiscoveryMu.Lock()
+	defer s.modelDiscoveryMu.Unlock()
+	if s.modelDiscoveryPending[requestID] == pending {
+		delete(s.modelDiscoveryPending, requestID)
+	}
+}
+
+func (s *ProxyServiceServer) isModelDiscoveryPendingFor(conn *proxyConnection, requestID string) bool {
+	if conn == nil || requestID == "" {
+		return false
+	}
+	s.modelDiscoveryMu.Lock()
+	defer s.modelDiscoveryMu.Unlock()
+	pending := s.modelDiscoveryPending[requestID]
+	return pending != nil && pending.proxyID == conn.proxyID && pending.sessionID == conn.sessionID
+}
+
+func (s *ProxyServiceServer) completeModelDiscovery(conn *proxyConnection, result *proto.ModelDiscoveryResult) {
+	if conn == nil || result == nil || result.GetRequestId() == "" {
+		return
+	}
+	s.modelDiscoveryMu.Lock()
+	pending := s.modelDiscoveryPending[result.GetRequestId()]
+	s.modelDiscoveryMu.Unlock()
+	if pending == nil || pending.proxyID != conn.proxyID || pending.sessionID != conn.sessionID {
+		return
+	}
+	select {
+	case pending.done <- modelDiscoveryCompletion{result: result}:
+	default:
+	}
+}
+
+func (s *ProxyServiceServer) failModelDiscoveries(conn *proxyConnection, err error) {
+	if conn == nil {
+		return
+	}
+	s.modelDiscoveryMu.Lock()
+	pending := make([]*pendingModelDiscovery, 0)
+	for _, item := range s.modelDiscoveryPending {
+		if item.proxyID == conn.proxyID && item.sessionID == conn.sessionID {
+			pending = append(pending, item)
+		}
+	}
+	s.modelDiscoveryMu.Unlock()
+	for _, item := range pending {
+		select {
+		case item.done <- modelDiscoveryCompletion{err: err}:
+		default:
+		}
+	}
+}
+
 // SendServiceUpdateToCluster sends a service update to all proxy servers in a specific cluster.
 // If clusterAddr is empty, broadcasts to all connected proxy servers (backward compatibility).
 // For create/update operations a unique one-time auth token is generated per
@@ -1049,6 +1304,12 @@ func (s *ProxyServiceServer) SendServiceUpdateToCluster(ctx context.Context, upd
 			continue
 		}
 		conn := connVal.(*proxyConnection)
+		// Membership can retain this proxy ID from a superseded session in a
+		// different cluster. The live connection address is authoritative,
+		// especially because Agent Network mappings can contain credentials.
+		if conn.address != clusterAddr {
+			continue
+		}
 		if conn.accountID != nil && update.AccountId != "" && *conn.accountID != update.AccountId {
 			continue
 		}

management/internals/shared/grpc/proxy_test.go

@@ -42,6 +42,10 @@ func newTestProxyController() *testProxyController {
 func (c *testProxyController) SendServiceUpdateToCluster(_ context.Context, _ string, _ *proto.ProxyMapping, _ string) {
 }
 
+func (c *testProxyController) DiscoverModels(_ context.Context, _, _ string, _ *proto.ModelDiscoveryRequest) (*proto.ModelDiscoveryResult, error) {
+	return nil, proxy.ErrModelDiscoveryUnavailable
+}
+
 func (c *testProxyController) GetOIDCValidationConfig() proxy.OIDCValidationConfig {
 	return proxy.OIDCValidationConfig{}
 }
@@ -218,6 +222,65 @@ func TestSendServiceUpdateToCluster_DeleteNoToken(t *testing.T) {
 	assert.Empty(t, msg2.AuthToken)
 }
 
+func TestSendServiceUpdateToCluster_RejectsStaleClusterMembership(t *testing.T) {
+	ctx := context.Background()
+	s := &ProxyServiceServer{
+		tokenStore: NewOneTimeTokenStore(ctx, testCacheStore(t)),
+	}
+	controller := newTestProxyController()
+	s.SetProxyController(controller)
+
+	ch := registerFakeProxy(s, "proxy-a", "new-cluster.example.com")
+	require.NoError(t, controller.RegisterProxyToCluster(ctx, "old-cluster.example.com", "proxy-a"))
+
+	s.SendServiceUpdateToCluster(ctx, &proto.ProxyMapping{
+		Type:      proto.ProxyMappingUpdateType_UPDATE_TYPE_CREATED,
+		Id:        "agent-network-provider-1",
+		AccountId: "account-1",
+		Domain:    "agent.example.com",
+		Path: []*proto.PathMapping{
+			{Path: "/", Target: "http://ollama.internal:11434/"},
+		},
+	}, "old-cluster.example.com")
+
+	assert.True(t, drainEmpty(ch), "stale membership must not route a mapping to a different live cluster")
+}
+
+func TestDisconnectProxy_RemovesSupersededMembershipFromOldCluster(t *testing.T) {
+	controller := newTestProxyController()
+	server := &ProxyServiceServer{proxyController: controller}
+	oldCtx, cancelOld := context.WithCancel(context.Background())
+	newCtx, cancelNew := context.WithCancel(context.Background())
+	t.Cleanup(cancelOld)
+	t.Cleanup(cancelNew)
+
+	oldConnection := &proxyConnection{
+		proxyID:   "proxy-a",
+		sessionID: "old-session",
+		address:   "old-cluster.example.com",
+		ctx:       oldCtx,
+		cancel:    cancelOld,
+	}
+	newConnection := &proxyConnection{
+		proxyID:   "proxy-a",
+		sessionID: "new-session",
+		address:   "new-cluster.example.com",
+		ctx:       newCtx,
+		cancel:    cancelNew,
+	}
+	require.NoError(t, controller.RegisterProxyToCluster(context.Background(), oldConnection.address, oldConnection.proxyID))
+	require.NoError(t, controller.RegisterProxyToCluster(context.Background(), newConnection.address, newConnection.proxyID))
+	server.connectedProxies.Store(newConnection.proxyID, newConnection)
+
+	server.disconnectProxy(oldConnection)
+
+	assert.Empty(t, controller.GetProxiesForCluster(oldConnection.address))
+	assert.Equal(t, []string{"proxy-a"}, controller.GetProxiesForCluster(newConnection.address))
+	current, ok := server.connectedProxies.Load(newConnection.proxyID)
+	require.True(t, ok)
+	assert.Same(t, newConnection, current)
+}
+
 func TestSendServiceUpdate_UniqueTokensPerProxy(t *testing.T) {
 	ctx := context.Background()
 	tokenStore := NewOneTimeTokenStore(ctx, testCacheStore(t))