[management] Expose live model discovery on the provider API

Adds POST /api/agent-network/catalog/providers/models, so the provider
form can offer the models an operator's own credential can reach instead
of only the compiled-in catalog.

A caller names a catalog provider and supplies either the key they are
typing (the record does not exist yet) or the id of a saved record whose
stored credential should be reused — which lets the dashboard refresh a
list without ever holding the key. The two are mutually exclusive:
accepting both would run an arbitrary credential under the identity of a
record the caller may only be permitted to read. When a record id is
given, the catalog id and upstream come from the record too, so the
credential cannot be aimed at a different vendor's endpoint.

Gated on Create rather than Read. This spends the operator's credential
against a third party, which is not something a read-only role should be
able to make the server do.

A provider with no listing endpoint answers 422 rather than 500: the
caller falls back to the catalog's own models on that outcome, so it has
to be distinguishable from a failure.

The region is read back out of the configured upstream by matching it
against the catalog's host template, since a provider record has no
region field and the operator already encoded one when they set up
inference. An upstream matching no template is refused rather than
guessed at — a wrong region would dial another account's endpoint.

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

@@ -0,0 +1,137 @@
+package handlers
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/netbirdio/netbird/management/internals/modules/agentnetwork"
+	"github.com/netbirdio/netbird/management/internals/modules/agentnetwork/modeldiscovery"
+	nbcontext "github.com/netbirdio/netbird/management/server/context"
+	"github.com/netbirdio/netbird/shared/auth"
+	"github.com/netbirdio/netbird/shared/management/http/api"
+)
+
+// discoveryManagerStub records what the handler asked for and returns a canned
+// answer. The Manager interface is embedded rather than implemented: only the
+// one method is reachable from this handler, and a call to any other should
+// fail loudly rather than silently return a zero value.
+type discoveryManagerStub struct {
+	agentnetwork.Manager
+
+	gotReq      modeldiscovery.Request
+	gotRecordID string
+	models      []modeldiscovery.Model
+	err         error
+}
+
+func (s *discoveryManagerStub) DiscoverProviderModels(
+	_ context.Context, _, _ string, req modeldiscovery.Request, recordID string,
+) ([]modeldiscovery.Model, error) {
+	s.gotReq = req
+	s.gotRecordID = recordID
+	return s.models, s.err
+}
+
+// postDiscovery drives the handler with an authenticated request.
+func postDiscovery(t *testing.T, stub *discoveryManagerStub, body string) *httptest.ResponseRecorder {
+	t.Helper()
+	h := &handler{manager: stub}
+
+	req := httptest.NewRequest(http.MethodPost, "/agent-network/catalog/providers/models", strings.NewReader(body))
+	req = req.WithContext(nbcontext.SetUserAuthInContext(req.Context(), auth.UserAuth{
+		AccountId: "acc-1",
+		UserId:    "user-1",
+	}))
+
+	rec := httptest.NewRecorder()
+	h.discoverProviderModels(rec, req)
+	return rec
+}
+
+func TestDiscoverModelsReturnsTheVendorList(t *testing.T) {
+	stub := &discoveryManagerStub{models: []modeldiscovery.Model{
+		{ID: "eu.anthropic.claude-haiku-4-5-20251001-v1:0", Label: "EU Claude Haiku 4.5", PricingKnown: true},
+		{ID: "global.cohere.embed-v4:0", Label: "Global Cohere Embed v4"},
+	}}
+
+	rec := postDiscovery(t, stub, `{
+		"catalog_provider_id":"bedrock_api",
+		"upstream_url":"https://bedrock-runtime.eu-central-1.amazonaws.com",
+		"api_key":"aws-bearer"
+	}`)
+	require.Equal(t, http.StatusOK, rec.Code, "body: %s", rec.Body.String())
+
+	var out api.AgentNetworkModelDiscoveryResponse
+	require.NoError(t, json.Unmarshal(rec.Body.Bytes(), &out))
+	require.Len(t, out.Models, 2)
+
+	assert.Equal(t, "eu.anthropic.claude-haiku-4-5-20251001-v1:0", out.Models[0].Id)
+	assert.True(t, out.Models[0].PricingKnown)
+	// An unpriced model must say so rather than arriving indistinguishable
+	// from a priced one: registering it silently would meter at zero.
+	assert.False(t, out.Models[1].PricingKnown)
+
+	assert.Equal(t, "bedrock_api", stub.gotReq.CatalogID)
+	assert.Equal(t, "aws-bearer", stub.gotReq.APIKey)
+	assert.Empty(t, stub.gotRecordID)
+}
+
+func TestDiscoverModelsUsesAStoredRecordWithoutAKey(t *testing.T) {
+	stub := &discoveryManagerStub{}
+
+	rec := postDiscovery(t, stub, `{"catalog_provider_id":"openai_api","provider_id":"prov-42"}`)
+	require.Equal(t, http.StatusOK, rec.Code, "body: %s", rec.Body.String())
+
+	// The dashboard refreshes a saved provider's list without ever holding
+	// the credential, so the record id has to reach the manager.
+	assert.Equal(t, "prov-42", stub.gotRecordID)
+	assert.Empty(t, stub.gotReq.APIKey)
+}
+
+// TestDiscoverModelsRefusesMixedCredentials covers the case where a caller
+// names a saved provider AND supplies a key. Accepting it would run an
+// arbitrary credential under the identity of a record the caller may only be
+// permitted to read.
+func TestDiscoverModelsRefusesMixedCredentials(t *testing.T) {
+	stub := &discoveryManagerStub{}
+
+	rec := postDiscovery(t, stub, `{
+		"catalog_provider_id":"openai_api",
+		"provider_id":"prov-42",
+		"api_key":"sk-attacker"
+	}`)
+	assert.Equal(t, http.StatusBadRequest, rec.Code)
+	assert.Empty(t, stub.gotRecordID, "the request must be refused before it reaches the manager")
+}
+
+// TestDiscoverModelsReportsNoDiscoveryDistinctly matters because the caller
+// falls back to the catalog's own model list on this outcome. Collapsing it
+// into a generic 500 would turn "this provider has no listing endpoint" into
+// "something went wrong", and the form would show an error instead of a list.
+func TestDiscoverModelsReportsNoDiscoveryDistinctly(t *testing.T) {
+	stub := &discoveryManagerStub{err: modeldiscovery.ErrNoDiscovery}
+
+	rec := postDiscovery(t, stub, `{"catalog_provider_id":"litellm_proxy","upstream_url":"https://gw.example.com","api_key":"sk"}`)
+	assert.Equal(t, http.StatusUnprocessableEntity, rec.Code)
+}
+
+func TestDiscoverModelsRejectsMalformedRequests(t *testing.T) {
+	for name, body := range map[string]string{
+		"not json":              `{`,
+		"no catalog provider":   `{"api_key":"sk"}`,
+		"blank catalog provide": `{"catalog_provider_id":"   ","api_key":"sk"}`,
+	} {
+		t.Run(name, func(t *testing.T) {
+			stub := &discoveryManagerStub{}
+			rec := postDiscovery(t, stub, body)
+			assert.Equal(t, http.StatusBadRequest, rec.Code)
+		})
+	}
+}

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

@@ -7,6 +7,7 @@ package handlers
 
 import (
 	"encoding/json"
+	"errors"
 	"math"
 	"net/http"
 	"net/url"
@@ -16,6 +17,7 @@ import (
 
 	"github.com/netbirdio/netbird/management/internals/modules/agentnetwork"
 	"github.com/netbirdio/netbird/management/internals/modules/agentnetwork/catalog"
+	"github.com/netbirdio/netbird/management/internals/modules/agentnetwork/modeldiscovery"
 	"github.com/netbirdio/netbird/management/internals/modules/agentnetwork/pricing"
 	"github.com/netbirdio/netbird/management/internals/modules/agentnetwork/types"
 	nbcontext "github.com/netbirdio/netbird/management/server/context"
@@ -32,6 +34,7 @@ type handler struct {
 func RegisterEndpoints(manager agentnetwork.Manager, router *mux.Router) {
 	h := &handler{manager: manager}
 	router.HandleFunc("/agent-network/catalog/providers", h.getCatalogProviders).Methods("GET", "OPTIONS")
+	router.HandleFunc("/agent-network/catalog/providers/models", h.discoverProviderModels).Methods("POST", "OPTIONS")
 	router.HandleFunc("/agent-network/providers", h.getAllProviders).Methods("GET", "OPTIONS")
 	router.HandleFunc("/agent-network/providers", h.createProvider).Methods("POST", "OPTIONS")
 	router.HandleFunc("/agent-network/providers/{providerId}", h.getProvider).Methods("GET", "OPTIONS")
@@ -61,6 +64,73 @@ func (h *handler) getCatalogProviders(w http.ResponseWriter, r *http.Request) {
 	util.WriteJSONObject(r.Context(), w, out)
 }
 
+// discoverProviderModels asks the vendor which models the operator's own
+// credential can reach, so the provider form can offer a live list rather than
+// only the static catalog.
+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
+	}
+
+	var body api.AgentNetworkModelDiscoveryRequest
+	if err := json.NewDecoder(r.Body).Decode(&body); err != nil {
+		util.WriteErrorResponse("invalid json", http.StatusBadRequest, w)
+		return
+	}
+	if strings.TrimSpace(body.CatalogProviderId) == "" {
+		util.WriteErrorResponse("catalog_provider_id is required", http.StatusBadRequest, w)
+		return
+	}
+
+	recordID := strValue(body.ProviderId)
+	req := modeldiscovery.Request{
+		CatalogID:   body.CatalogProviderId,
+		UpstreamURL: strValue(body.UpstreamUrl),
+		APIKey:      strValue(body.ApiKey),
+	}
+	// One source of credential or the other, never a mix: taking a key from
+	// the request while addressing a saved record would let a caller run an
+	// arbitrary credential against a provider they can only read.
+	if recordID != "" && req.APIKey != "" {
+		util.WriteErrorResponse("provide either provider_id or api_key, not both", http.StatusBadRequest, w)
+		return
+	}
+
+	models, err := h.manager.DiscoverProviderModels(r.Context(), userAuth.AccountId, userAuth.UserId, req, recordID)
+	if err != nil {
+		// A provider with no listing endpoint is a fact about the catalog
+		// entry, not a failure: the caller falls back to the catalog's own
+		// models, so it must be able to tell the two apart.
+		if errors.Is(err, modeldiscovery.ErrNoDiscovery) {
+			util.WriteErrorResponse(err.Error(), http.StatusUnprocessableEntity, w)
+			return
+		}
+		util.WriteError(r.Context(), err, w)
+		return
+	}
+
+	out := api.AgentNetworkModelDiscoveryResponse{Models: make([]api.AgentNetworkDiscoveredModel, 0, len(models))}
+	for _, m := range models {
+		entry := api.AgentNetworkDiscoveredModel{Id: m.ID, PricingKnown: m.PricingKnown}
+		if m.Label != "" {
+			label := m.Label
+			entry.Label = &label
+		}
+		out.Models = append(out.Models, entry)
+	}
+	util.WriteJSONObject(r.Context(), w, out)
+}
+
+// strValue reads an optional string field, treating absent as empty.
+func strValue(v *string) string {
+	if v == nil {
+		return ""
+	}
+	return strings.TrimSpace(*v)
+}
+
 // applyDefaultPricing overwrites the catalog response's model rates with
 // the LIVE default pricing table, which may differ from the compiled-in
 // catalog rates when the operator provides a defaults_llm_pricing.yaml.