From c605b26fc71de20105ead674f19dee3916f5531b Mon Sep 17 00:00:00 2001
From: Ettore Di Giacinto <mudler@localai.io>
Date: Tue, 3 Nov 2026 21:26:58 +0000
Subject: [PATCH] feat(addons): ask the Authority on every host operation call

The broker copied the allowed prefixes when an add-on started, so a
change of grants needed a restart of the add-on. Take an Authority
instead and ask it on each call: a revoke or a deny applies to the next
call, and a call that already runs finishes. A refused call answers the
same text whatever the reason; the reason goes to the log.

The supervisor opens the host endpoint when the add-on holds an
operation or its manifest declares one, so an add-on with an optional
operation and no grant starts degraded and a later grant works at once.
The broker now exists whenever the add-on manager does. The manager,
the apps list and the tool filters read the same Authority, which is the
startup policy until another one is set. Admission also tells a denied
operation from a missing grant.

Assisted-by: Claude:claude-sonnet-5-5 go
---
 core/application/addon_gateway.go             | 114 +++++++++++----
 core/application/addon_tool_feature_test.go   |   3 +-
 core/application/application.go               |   4 +
 core/application/execution_binding.go         |   2 +-
 core/application/execution_binding_test.go    |   3 +-
 core/application/studio_addons_test.go        |   2 +-
 core/services/addons/admission.go             |   9 +-
 core/services/addons/hostops/admission.go     |  44 +++++-
 core/services/addons/hostops/broker.go        |  29 +++-
 .../addons/hostops/broker_authority_test.go   | 134 ++++++++++++++++++
 .../addons/hostops/observation_test.go        |  12 +-
 core/services/addons/manager.go               |  33 ++++-
 .../addons/runtime/observation_test.go        |   4 +-
 core/services/addons/runtime/supervisor.go    |  43 +++---
 .../addons/runtime/supervisor_test.go         |  49 ++++++-
 tests/addons/actione2e/actions_e2e_test.go    |   2 +-
 16 files changed, 417 insertions(+), 70 deletions(-)
 create mode 100644 core/services/addons/hostops/broker_authority_test.go

diff --git a/core/application/addon_gateway.go b/core/application/addon_gateway.go
index cf751a6b63..d1989e2429 100644
--- a/core/application/addon_gateway.go
+++ b/core/application/addon_gateway.go
@@ -10,6 +10,7 @@ import (
 	"net"
 	"net/http"
 	"path/filepath"
+	"slices"
 	"strings"
 	"time"
 
@@ -47,8 +48,10 @@ func (a *Application) AddonToolProvider() *mcpTools.AddonToolProvider {
 	p := mcpTools.NewAddonToolProvider(addontools.NewToolAdapter(a.addonGateway), a.AddonOwnershipMode())
 	if db := a.AuthDB(); db != nil {
 		has := addonFeatureCheck(db)
-		hostOps := a.applicationConfig.AddonHostOps
-		p = p.WithHidden(func(actor contract.Actor) map[string]bool { return addonsWithoutFeature(hostOps, has, actor) })
+		authority := a.addonAuthority()
+		p = p.WithHidden(func(actor contract.Actor) map[string]bool {
+			return addonsWithoutFeature(authority, a.installedAddonIDs(), has, actor)
+		})
 	}
 	return p
 }
@@ -57,19 +60,57 @@ func (a *Application) AddonToolProvider() *mcpTools.AddonToolProvider {
 // when this process offers none.
 func (a *Application) AddonHostOps() *addonruntime.HostOps { return a.addonHostOps }
 
+// addonAuthority is what every reader of add-on host operation grants asks:
+// the broker on each call, the manager at admission, and the tool filters. It
+// is the Authority set with SetAddonAuthority, and until one is set, the
+// startup policy of the deployment, which never changes.
+func (a *Application) addonAuthority() hostops.Authority {
+	a.addonAuthorityOnce.Do(func() {
+		if a.hostAuthority == nil {
+			var floor map[string][]string
+			if a.applicationConfig != nil {
+				floor = a.applicationConfig.AddonHostOps
+			}
+			a.hostAuthority = hostops.NewStaticAuthority(floor)
+		}
+	})
+	return a.hostAuthority
+}
+
+// SetAddonAuthority sets the Authority of the add-on host operations. It must
+// be called once, before the add-on manager starts; a later call is ignored,
+// so a grant never changes the rule by which it is checked.
+func (a *Application) SetAddonAuthority(auth hostops.Authority) {
+	a.addonAuthorityOnce.Do(func() { a.hostAuthority = auth })
+}
+
+// installedAddonIDs lists the add-ons the owner knows, or none in a process
+// without the add-on manager.
+func (a *Application) installedAddonIDs() []string {
+	if a.addonManager == nil {
+		return nil
+	}
+	ids, err := a.addonManager.InstalledIDs(context.Background())
+	if err != nil {
+		return nil
+	}
+	return ids
+}
+
 // newAddonHostOps builds the host operation broker for the supervisor of the
-// owner. A frontend without the add-on manager, or a host whose setting names
-// no add-on, builds nothing, so the channel fails closed. The setting is a
-// host setting read at startup; no manifest or request can add to it.
+// owner. A frontend without the add-on manager builds nothing, so the channel
+// fails closed. The broker exists whenever the manager does, even when no
+// grant exists yet: a grant made later applies to the next call, with no
+// restart. What an add-on may call is the Authority; no manifest or request can
+// add to it.
 func (a *Application) newAddonHostOps(m *addons.Manager, limits contract.Limits) *addonruntime.HostOps {
-	allowed := a.applicationConfig.AddonHostOps
-	if m == nil || len(allowed) == 0 {
+	if m == nil {
 		return nil
 	}
 	in := hostops.NewInFlight()
 	broker := hostops.New(in, addonFeatureCheck(a.authDB), limits)
 	broker.SetAdminCheck(addonAdminCheck(a.authDB))
-	return &addonruntime.HostOps{Broker: broker, InFlight: in, Allowed: allowed}
+	return &addonruntime.HostOps{Broker: broker, InFlight: in, Authority: a.addonAuthority()}
 }
 
 // RegisterAddonEngineJobs registers the engine job operations with the services
@@ -575,7 +616,7 @@ func (a *Application) StudioAddonTools() studio.AddonTools {
 	if db := a.AuthDB(); db != nil {
 		has = addonFeatureCheck(db)
 	}
-	return &studioAddons{adapter: addontools.NewChatToolAdapter(a.addonGateway), mode: a.AddonOwnershipMode(), hostOps: a.applicationConfig.AddonHostOps, has: has}
+	return &studioAddons{adapter: addontools.NewChatToolAdapter(a.addonGateway), mode: a.AddonOwnershipMode(), hostOps: a.addonAuthority(), ids: a.installedAddonIDs, has: has}
 }
 
 // lateStudioAddons asks for the broker at each call: the chats service starts
@@ -659,9 +700,11 @@ func (l lateStudioAddons) Call(ctx context.Context, user, conv, name string, arg
 type studioAddons struct {
 	adapter *addontools.ToolAdapter
 	mode    string
-	// hostOps maps an add-on ID to the host operation prefixes it may call. An
-	// add-on that may call the workspace operations needs the Files workspace.
-	hostOps map[string][]string
+	// hostOps says which host operations an add-on may call. An add-on that may
+	// call the workspace operations needs the Files workspace.
+	hostOps hostops.Authority
+	// ids lists the installed add-ons, for the rules that name add-ons.
+	ids func() []string
 	// has answers whether a user holds a host feature. Nil offers every tool.
 	has func(userID, feature string) bool
 }
@@ -673,26 +716,41 @@ var hostOpFeatures = map[string]string{"finetune.": auth.FeatureFineTuning, "qua
 
 // addonsWithoutFeature names the add-ons whose host operations need a feature
 // the actor does not hold. Local-owner mode has no accounts and hides none.
-func addonsWithoutFeature(hostOps map[string][]string, has func(userID, feature string) bool, actor contract.Actor) map[string]bool {
-	if has == nil || actor.Mode == auth.AddonModeLocalOwner {
+func addonsWithoutFeature(authority hostops.Authority, ids []string, has func(userID, feature string) bool, actor contract.Actor) map[string]bool {
+	if has == nil || actor.Mode == auth.AddonModeLocalOwner || authority == nil {
 		return nil
 	}
 	denied := map[string]bool{}
-	for addon, prefixes := range hostOps {
-		for _, p := range prefixes {
-			if f, ok := hostOpFeatures[p]; ok && !has(actor.UserID, f) {
-				denied[addon] = true
+	for _, addon := range ids {
+		for _, p := range heldOperations(authority, addon) {
+			for family, f := range hostOpFeatures {
+				if strings.HasPrefix(p, family) && !has(actor.UserID, f) {
+					denied[addon] = true
+				}
 			}
 		}
 	}
 	return denied
 }
 
+// heldOperations lists the operation prefixes and names an add-on holds now.
+func heldOperations(authority hostops.Authority, addonID string) []string {
+	if authority == nil {
+		return nil
+	}
+	set := authority.Snapshot(addonID)
+	return append(slices.Clone(set.Prefixes), set.Operations...)
+}
+
 // filterByFeature drops the tools of the add-ons whose host operations need a
 // feature the actor does not hold, so a model is not offered a tool that can
 // only answer "no permission". Local-owner mode has no accounts and keeps all.
-func filterByFeature(tools []studio.AddonTool, hostOps map[string][]string, has func(userID, feature string) bool, actor contract.Actor) []studio.AddonTool {
-	denied := addonsWithoutFeature(hostOps, has, actor)
+func filterByFeature(tools []studio.AddonTool, hostOps hostops.Authority, has func(userID, feature string) bool, actor contract.Actor) []studio.AddonTool {
+	ids := make([]string, 0, len(tools))
+	for _, t := range tools {
+		ids = append(ids, t.AddonID)
+	}
+	denied := addonsWithoutFeature(hostOps, ids, has, actor)
 	if len(denied) == 0 {
 		return tools
 	}
@@ -705,9 +763,17 @@ func filterByFeature(tools []studio.AddonTool, hostOps map[string][]string, has
 	return out
 }
 
+// installed lists the installed add-ons, or none when no list is wired.
+func (s *studioAddons) installed() []string {
+	if s.ids == nil {
+		return nil
+	}
+	return s.ids()
+}
+
 // needsWorkspace says whether the add-on works on the files of the user.
 func (s *studioAddons) needsWorkspace(addonID string) bool {
-	return hasWorkspaceOperation(s.hostOps[addonID])
+	return hasWorkspaceOperation(heldOperations(s.hostOps, addonID))
 }
 
 func hasWorkspaceOperation(operations []string) bool {
@@ -825,7 +891,7 @@ func (s *studioAddons) AddonSkills(ctx context.Context, user string) ([]studio.A
 	if err != nil {
 		return nil, err
 	}
-	denied := addonsWithoutFeature(s.hostOps, s.has, actor)
+	denied := addonsWithoutFeature(s.hostOps, s.installed(), s.has, actor)
 	out := make([]studio.AddonSkillSet, 0, len(list))
 	for _, a := range list {
 		if denied[a.AddonID] {
@@ -852,7 +918,7 @@ func (s *studioAddons) AddonContextFiles(ctx context.Context, user string) ([]st
 	if err != nil {
 		return nil, err
 	}
-	denied := addonsWithoutFeature(s.hostOps, s.has, actor)
+	denied := addonsWithoutFeature(s.hostOps, s.installed(), s.has, actor)
 	out := make([]studio.AddonContextSet, 0, len(list))
 	for _, a := range list {
 		if denied[a.AddonID] {
@@ -899,7 +965,7 @@ func (s *studioAddons) AddonShadowers(ctx context.Context, user string) ([]studi
 	if err != nil {
 		return nil, err
 	}
-	denied := addonsWithoutFeature(s.hostOps, s.has, actor)
+	denied := addonsWithoutFeature(s.hostOps, s.installed(), s.has, actor)
 	out := make([]studio.AddonShadower, 0, len(list))
 	for _, a := range list {
 		if denied[a.AddonID] {
diff --git a/core/application/addon_tool_feature_test.go b/core/application/addon_tool_feature_test.go
index e70cd868d4..6240c970da 100644
--- a/core/application/addon_tool_feature_test.go
+++ b/core/application/addon_tool_feature_test.go
@@ -2,6 +2,7 @@
 package application
 
 import (
+	"github.com/mudler/LocalAI/core/services/addons/hostops"
 	"slices"
 
 	. "github.com/onsi/ginkgo/v2"
@@ -13,7 +14,7 @@ import (
 )
 
 var _ = Describe("add-on tools offered to a chat by the features of the person", func() {
-	hostOps := map[string][]string{"fine-tuning": {"finetune."}, "quantization": {"quantize."}, "sandbox": {"workspace."}}
+	hostOps := hostops.NewStaticAuthority(map[string][]string{"fine-tuning": {"finetune."}, "quantization": {"quantize."}, "sandbox": {"workspace."}})
 	all := []studio.AddonTool{{Name: "addon__fine-tuning__fine-tune-list", AddonID: "fine-tuning"}, {Name: "addon__quantization__quantize-list", AddonID: "quantization"},
 		{Name: "addon__sandbox__bash", AddonID: "sandbox"}, {Name: "addon__tables__tables-create", AddonID: "tables"}}
 	names := func(in []studio.AddonTool) []string {
diff --git a/core/application/application.go b/core/application/application.go
index a14656f8c4..8b202cc511 100644
--- a/core/application/application.go
+++ b/core/application/application.go
@@ -114,6 +114,9 @@ type Application struct {
 	backendLibrary  *backendlib.Installer
 	addonManager    *addons.Manager
 	addonHostOps    *addonruntime.HostOps
+	// hostAuthority answers what each add-on may call; see addonAuthority.
+	hostAuthority      hostops.Authority
+	addonAuthorityOnce sync.Once
 	// addonTransfers holds the handles of connector file transfers; see transfers.
 	addonTransfers     *hostops.Transfers
 	addonTransfersOnce sync.Once
@@ -1009,6 +1012,7 @@ func (a *Application) startAddons() error {
 		}
 	}
 	m.SetHostOps(a.applicationConfig.AddonHostOps)
+	m.SetAuthority(a.addonAuthority())
 	if c.InstanceID == c.OwnerID {
 		// Data recovery sits beside the manager: an upgrade of an add-on that
 		// has data goes through it, and its journals are settled before any
diff --git a/core/application/execution_binding.go b/core/application/execution_binding.go
index f5c72c18bf..27c88634c3 100644
--- a/core/application/execution_binding.go
+++ b/core/application/execution_binding.go
@@ -82,7 +82,7 @@ func (a *Application) resolveExecutionBindingWithTools(ctx context.Context, acto
 	// Workspace-dependent tools cannot be selected without the actual workspace.
 	eligible := defs[:0:0]
 	for _, d := range defs {
-		needsWorkspace := hasWorkspaceOperation(a.applicationConfig.AddonHostOps[d.AddonID])
+		needsWorkspace := hasWorkspaceOperation(heldOperations(a.addonAuthority(), d.AddonID))
 		if needsWorkspace && !a.StudioFiles().Available() {
 			continue
 		}
diff --git a/core/application/execution_binding_test.go b/core/application/execution_binding_test.go
index fc41182d97..31d7f4d857 100644
--- a/core/application/execution_binding_test.go
+++ b/core/application/execution_binding_test.go
@@ -9,6 +9,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"github.com/mudler/LocalAI/core/services/addons/hostops"
 	"net"
 	"net/http"
 	"net/http/httptest"
@@ -446,7 +447,7 @@ type ordinaryBindingStore struct{ store.Store }
 var _ = Describe("workspace operation declarations", func() {
 	DescribeTable("retains the workspace dot prefix semantics", func(operations []string, want bool) {
 		Expect(hasWorkspaceOperation(operations)).To(Equal(want))
-		adapter := &studioAddons{hostOps: map[string][]string{"sample": operations}}
+		adapter := &studioAddons{hostOps: hostops.NewStaticAuthority(map[string][]string{"sample": operations})}
 		Expect(adapter.needsWorkspace("sample")).To(Equal(want))
 		Expect(adapter.needsWorkspace("other")).To(BeFalse())
 	},
diff --git a/core/application/studio_addons_test.go b/core/application/studio_addons_test.go
index 509840d4d5..218e4eb6a3 100644
--- a/core/application/studio_addons_test.go
+++ b/core/application/studio_addons_test.go
@@ -126,7 +126,7 @@ var _ = Describe("the studio add-ons", func() {
 	})
 
 	It("makes an add-on that needs the workspace unavailable while files are off", func() {
-		s := &studioAddons{mode: auth.AddonModeNamedUser, hostOps: map[string][]string{"sandbox": {"workspace."}, "office": {"workspace."}, "fine-tuning": {"finetune."}}}
+		s := &studioAddons{mode: auth.AddonModeNamedUser, hostOps: hostops.NewStaticAuthority(map[string][]string{"sandbox": {"workspace."}, "office": {"workspace."}, "fine-tuning": {"finetune."}})}
 		ctx := context.Background()
 		for _, id := range []string{"sandbox", "office"} {
 			Expect(s.Unavailable(ctx, "alice", id, false)).To(ContainSubstring("workspace"), "%s with files off", id)
diff --git a/core/services/addons/admission.go b/core/services/addons/admission.go
index 536fe2952d..44ba285b06 100644
--- a/core/services/addons/admission.go
+++ b/core/services/addons/admission.go
@@ -18,7 +18,7 @@ func (e *HostRequirementsRefusal) Error() string {
 	return fmt.Sprintf("required host operations unavailable: %s; configure host policy and restart", strings.Join(e.Summary.MissingRequired, ", "))
 }
 func (m *Manager) requests(r packages.PackageReceipt) hostops.RequestSummary {
-	return hostops.Requests(r.Manifest.Capabilities.HostOperations, hostops.SupportedOperations(), m.hostOps[r.Manifest.ID])
+	return hostops.RequestsFor(r.Manifest.Capabilities.HostOperations, hostops.SupportedOperations(), m.hostAuthority(), r.Manifest.ID)
 }
 func (m *Manager) admit(r packages.PackageReceipt) error {
 	s := m.requests(r)
@@ -53,3 +53,10 @@ func copyRequestSummary(s *hostops.RequestSummary) *hostops.RequestSummary {
 	out.MissingOptional = slices.Clone(s.MissingOptional)
 	return &out
 }
+
+// held lists what an add-on holds now as operation prefixes and names, the
+// form the apps list reads to decide which host controls to draw.
+func held(a hostops.Authority, id string) []string {
+	set := a.Snapshot(id)
+	return append(slices.Clone(set.Prefixes), set.Operations...)
+}
diff --git a/core/services/addons/hostops/admission.go b/core/services/addons/hostops/admission.go
index e0805be710..891f75215f 100644
--- a/core/services/addons/hostops/admission.go
+++ b/core/services/addons/hostops/admission.go
@@ -17,14 +17,35 @@ type RequestSummary struct {
 	Granted         []string `json:"granted,omitempty"`
 	MissingRequired []string `json:"missingRequired,omitempty"`
 	MissingOptional []string `json:"missingOptional,omitempty"`
-	RequiredCount   int      `json:"requiredCount"`
-	OptionalCount   int      `json:"optionalCount"`
-	GrantedCount    int      `json:"grantedCount"`
+	// DeniedRequired and DeniedOptional are the missing operations that a deny
+	// rule forbids. They are also listed in the Missing lists. An operation
+	// that is denied can never be approved, so a caller reads this to tell
+	// "ask the administrator to approve" from "blocked by policy".
+	DeniedRequired []string `json:"deniedRequired,omitempty"`
+	DeniedOptional []string `json:"deniedOptional,omitempty"`
+	RequiredCount  int      `json:"requiredCount"`
+	OptionalCount  int      `json:"optionalCount"`
+	GrantedCount   int      `json:"grantedCount"`
 }
 
 // Requests is side-effect free. Registry membership is exact; coverage uses the
 // broker's literal nonempty prefix rule, not a regexp or a request-as-grant.
 func Requests(req *contract.HostOperations, registered, grants []string) RequestSummary {
+	return RequestsFor(req, registered, NewStaticAuthority(map[string][]string{"": grants}), "")
+}
+
+// RequestsFor is Requests against an Authority: an operation counts as granted
+// when the authority allows it to the add-on now.
+func RequestsFor(req *contract.HostOperations, registered []string, auth Authority, addonID string) RequestSummary {
+	return requestsWith(req, registered, func(op string) (bool, Reason) {
+		if auth == nil {
+			return false, ReasonNotGranted
+		}
+		return auth.Allows(addonID, op)
+	})
+}
+
+func requestsWith(req *contract.HostOperations, registered []string, allows func(op string) (bool, Reason)) RequestSummary {
 	s := RequestSummary{}
 	if req == nil {
 		return s
@@ -35,12 +56,23 @@ func Requests(req *contract.HostOperations, registered, grants []string) Request
 	slices.Sort(s.Optional)
 	for i, names := range [][]string{s.Required, s.Optional} {
 		for _, name := range names {
-			if slices.Contains(registered, name) && hasPrefix(grants, name) {
+			ok, why := false, ReasonNotGranted
+			if slices.Contains(registered, name) {
+				ok, why = allows(name)
+			}
+			switch {
+			case ok:
 				s.Granted = append(s.Granted, name)
-			} else if i == 0 {
+			case i == 0:
 				s.MissingRequired = append(s.MissingRequired, name)
-			} else {
+				if why.Denied() {
+					s.DeniedRequired = append(s.DeniedRequired, name)
+				}
+			default:
 				s.MissingOptional = append(s.MissingOptional, name)
+				if why.Denied() {
+					s.DeniedOptional = append(s.DeniedOptional, name)
+				}
 			}
 		}
 	}
diff --git a/core/services/addons/hostops/broker.go b/core/services/addons/hostops/broker.go
index ec6433160a..c995f350de 100644
--- a/core/services/addons/hostops/broker.go
+++ b/core/services/addons/hostops/broker.go
@@ -8,6 +8,7 @@ import (
 	"errors"
 	"fmt"
 	"github.com/mudler/LocalAI/core/services/addons/modelsprobe"
+	"github.com/mudler/xlog"
 	"io"
 	"net/http"
 	"strings"
@@ -157,8 +158,10 @@ func refuse(w http.ResponseWriter, status int, code, msg string) {
 // Handler serves the channel of one add-on incarnation. credential is the
 // secret that incarnation holds; allowed lists the operation prefixes the
 // host setting gives the add-on. Whatever the check, the default is refuse.
+// It is a fixed list: use HandlerForRuntime with an Authority for grants that
+// change while the add-on runs.
 func (b *Broker) Handler(addonID, credential string, allowed []string) http.Handler {
-	return b.HandlerForRuntime(addonID, credential, allowed, 0, "")
+	return b.HandlerForRuntime(addonID, credential, NewStaticAuthority(map[string][]string{addonID: allowed}), 0, "")
 }
 
 // RuntimeEndpoint owns callback admission and draining for one runtime. Stop
@@ -174,8 +177,10 @@ type RuntimeEndpoint struct {
 
 type endpointKey struct{}
 
-func (b *Broker) EndpointForRuntime(addonID, credential string, allowed []string, generation uint64, incarnation string) *RuntimeEndpoint {
-	return &RuntimeEndpoint{handler: b.HandlerForRuntime(addonID, credential, allowed, generation, incarnation)}
+// EndpointForRuntime serves one runtime. auth is asked on every call, so a
+// revoke or a deny applies to the next call; a nil auth refuses every call.
+func (b *Broker) EndpointForRuntime(addonID, credential string, auth Authority, generation uint64, incarnation string) *RuntimeEndpoint {
+	return &RuntimeEndpoint{handler: b.HandlerForRuntime(addonID, credential, auth, generation, incarnation)}
 }
 
 func (e *RuntimeEndpoint) ServeHTTP(w http.ResponseWriter, r *http.Request) {
@@ -204,8 +209,11 @@ func (e *RuntimeEndpoint) admit() bool {
 	return !e.closed
 }
 
-// HandlerForRuntime authenticates callbacks for exactly one runtime.
-func (b *Broker) HandlerForRuntime(addonID, credential string, allowed []string, generation uint64, incarnation string) http.Handler {
+// HandlerForRuntime authenticates callbacks for exactly one runtime. The
+// authority is asked for every call, after the credential check and before
+// anything else of the operation runs. A call that already runs is not
+// interrupted by a later revoke.
+func (b *Broker) HandlerForRuntime(addonID, credential string, auth Authority, generation uint64, incarnation string) http.Handler {
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		if r.Method != http.MethodPost {
 			refuse(w, http.StatusMethodNotAllowed, contract.HostBadRequest, "POST only")
@@ -234,7 +242,16 @@ func (b *Broker) HandlerForRuntime(addonID, credential string, allowed []string,
 			refuse(w, http.StatusForbidden, contract.HostScope, "observation callbacks denied")
 			return
 		}
-		if !hasPrefix(allowed, req.Op) {
+		// The add-on must not learn whether an operation is denied or only not
+		// granted, so the body is the same. The reason stays on the host.
+		if auth == nil {
+			refuse(w, http.StatusForbidden, contract.HostUnknownOp, "operation not allowed")
+			return
+		}
+		if ok, why := auth.Allows(addonID, req.Op); !ok {
+			if why.Denied() || why == ReasonIdentityMismatch {
+				xlog.Info("add-on host operation refused", "addon", addonID, "op", req.Op, "reason", string(why))
+			}
 			refuse(w, http.StatusForbidden, contract.HostUnknownOp, "operation not allowed")
 			return
 		}
diff --git a/core/services/addons/hostops/broker_authority_test.go b/core/services/addons/hostops/broker_authority_test.go
new file mode 100644
index 0000000000..4da6e883ea
--- /dev/null
+++ b/core/services/addons/hostops/broker_authority_test.go
@@ -0,0 +1,134 @@
+// SPDX-License-Identifier: MIT
+package hostops
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+	"sync"
+	"time"
+
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
+)
+
+// liveAuthority is a test Authority whose grants change while it is in use.
+type liveAuthority struct {
+	mu     sync.Mutex
+	grants map[string]Reason
+}
+
+func (l *liveAuthority) set(op string, why Reason) {
+	l.mu.Lock()
+	defer l.mu.Unlock()
+	l.grants[op] = why
+}
+
+func (l *liveAuthority) Allows(_, op string) (bool, Reason) {
+	l.mu.Lock()
+	defer l.mu.Unlock()
+	why, ok := l.grants[op]
+	if !ok {
+		return false, ReasonNotGranted
+	}
+	return why == ReasonNone, why
+}
+func (l *liveAuthority) Snapshot(string) EffectiveSet { return EffectiveSet{} }
+func (l *liveAuthority) Entitled(string) bool         { return true }
+
+var _ = Describe("Broker authority", func() {
+	newLive := func(auth Authority) *fixture {
+		f := newFixture(always)
+		f.h = f.b.HandlerForRuntime("fine-tuning", "secret", auth, 0, "")
+		end := f.inflight.Begin(env("fine-tuning", "op1", "read", time.Now().Add(time.Minute)))
+		DeferCleanup(end)
+		return f
+	}
+
+	It("applies a revoke to the next call", func() {
+		auth := &liveAuthority{grants: map[string]Reason{"finetune.get": ReasonNone}}
+		f := newLive(auth)
+		code, _ := f.call("secret", "op1", "finetune.get", `{}`)
+		Expect(code).To(Equal(http.StatusOK))
+		auth.set("finetune.get", ReasonDeniedByAdmin)
+		code, out := f.call("secret", "op1", "finetune.get", `{}`)
+		Expect(code).To(Equal(http.StatusForbidden))
+		Expect(out.Error.Code).To(Equal("unknown_op"))
+		auth.set("finetune.get", ReasonNone)
+		code, _ = f.call("secret", "op1", "finetune.get", `{}`)
+		Expect(code).To(Equal(http.StatusOK), "a later grant applies with no restart")
+	})
+
+	It("answers the same to a denied and a not granted operation", func() {
+		auth := &liveAuthority{grants: map[string]Reason{"finetune.get": ReasonDeniedByPolicyFile, "finetune.list": ReasonIdentityMismatch}}
+		f := newLive(auth)
+		codeA, a := f.call("secret", "op1", "finetune.get", `{}`)
+		codeB, b := f.call("secret", "op1", "finetune.list", `{}`)
+		codeC, c := f.call("secret", "op1", "finetune.start", `{}`)
+		Expect([]int{codeA, codeB, codeC}).To(Equal([]int{403, 403, 403}))
+		Expect(a).To(Equal(b))
+		Expect(b).To(Equal(c))
+	})
+
+	It("lets a running call finish after the revoke", func() {
+		auth := &liveAuthority{grants: map[string]Reason{"finetune.get": ReasonNone}}
+		f := newLive(auth)
+		started, release := make(chan struct{}), make(chan struct{})
+		b := New(f.inflight, always, f.b.limits)
+		Expect(b.Register(Spec{Op: "finetune.get", Scope: "read", Feature: "fine_tuning", Handler: func(context.Context, Call) (json.RawMessage, error) {
+			close(started)
+			<-release
+			return json.RawMessage(`{"done":true}`), nil
+		}})).To(Succeed())
+		f.b, f.h = b, b.HandlerForRuntime("fine-tuning", "secret", auth, 0, "")
+		done := make(chan int, 1)
+		go func() {
+			code, _ := f.call("secret", "op1", "finetune.get", `{}`)
+			done <- code
+		}()
+		Eventually(started).Should(BeClosed())
+		auth.set("finetune.get", ReasonDeniedByAdmin)
+		close(release)
+		Eventually(done).Should(Receive(Equal(http.StatusOK)))
+		code, _ := f.call("secret", "op1", "finetune.get", `{}`)
+		Expect(code).To(Equal(http.StatusForbidden))
+	})
+
+	It("refuses everything without an authority", func() {
+		f := newFixture(always)
+		f.h = f.b.HandlerForRuntime("fine-tuning", "secret", nil, 0, "")
+		code, _ := f.call("secret", "op1", "finetune.get", `{}`)
+		Expect(code).To(Equal(http.StatusForbidden))
+	})
+
+	It("is safe under concurrent calls and changes", func() {
+		auth := &liveAuthority{grants: map[string]Reason{"finetune.get": ReasonNone}}
+		f := newLive(auth)
+		b := New(f.inflight, always, f.b.limits)
+		Expect(b.Register(Spec{Op: "finetune.get", Scope: "read", Feature: "fine_tuning", Handler: func(context.Context, Call) (json.RawMessage, error) {
+			return json.RawMessage(`{}`), nil
+		}})).To(Succeed())
+		f.b, f.h = b, b.HandlerForRuntime("fine-tuning", "secret", auth, 0, "")
+		var wg sync.WaitGroup
+		for i := 0; i < 8; i++ {
+			wg.Add(2)
+			go func() {
+				defer wg.Done()
+				for j := 0; j < 20; j++ {
+					f.call("secret", "op1", "finetune.get", `{}`)
+				}
+			}()
+			go func(i int) {
+				defer wg.Done()
+				for j := 0; j < 20; j++ {
+					if (i+j)%2 == 0 {
+						auth.set("finetune.get", ReasonNone)
+					} else {
+						auth.set("finetune.get", ReasonDeniedByAdmin)
+					}
+				}
+			}(i)
+		}
+		wg.Wait()
+	})
+})
diff --git a/core/services/addons/hostops/observation_test.go b/core/services/addons/hostops/observation_test.go
index 3c1c38f295..5980aaf70b 100644
--- a/core/services/addons/hostops/observation_test.go
+++ b/core/services/addons/hostops/observation_test.go
@@ -35,7 +35,7 @@ var _ = Describe("Observation callback boundary", func() {
 				return json.RawMessage(`{}`), nil
 			}})).To(Succeed())
 		}
-		f.h = f.b.HandlerForRuntime("fine-tuning", "secret", []string{"workspace.", "finetune.", "connector."}, 1, "inc")
+		f.h = f.b.HandlerForRuntime("fine-tuning", "secret", NewStaticAuthority(map[string][]string{"fine-tuning": []string{"workspace.", "finetune.", "connector."}}), 1, "inc")
 		e := env("fine-tuning", "status", "read", time.Now().Add(time.Minute))
 		end, denied, err := f.inflight.BeginObservation(e, Binding{}, "inc", "request")
 		Expect(err).NotTo(HaveOccurred())
@@ -88,7 +88,7 @@ var _ = Describe("Observation identity checks", func() {
 		end, denied, err := f.inflight.BeginObservation(e, Binding{}, "inc", "q")
 		Expect(err).NotTo(HaveOccurred())
 		DeferCleanup(end)
-		f.h = f.b.HandlerForRuntime("fine-tuning", "secret", []string{"finetune."}, 2, "replacement")
+		f.h = f.b.HandlerForRuntime("fine-tuning", "secret", NewStaticAuthority(map[string][]string{"fine-tuning": []string{"finetune."}}), 2, "replacement")
 		code, _ := f.call("secret", "status", "finetune.get", `{}`)
 		Expect(code).To(Equal(403))
 		Expect(denied()).To(BeTrue())
@@ -167,7 +167,7 @@ var _ = Describe("Callback endpoint retirement", func() {
 		end, _, err := f.BeginObservation(env("fine-tuning", "status", "read", time.Now().Add(time.Minute)), Binding{}, "inc", "q")
 		Expect(err).NotTo(HaveOccurred())
 		end()
-		h := b.EndpointForRuntime("fine-tuning", "secret", []string{"connector."}, 1, "inc")
+		h := b.EndpointForRuntime("fine-tuning", "secret", NewStaticAuthority(map[string][]string{"fine-tuning": []string{"connector."}}), 1, "inc")
 		body := &callbackBodyBarrier{Reader: strings.NewReader(`{"operationId":"status","op":"connector.inbound","arguments":{}}`), read: make(chan struct{}), resume: make(chan struct{})}
 		req := httptest.NewRequest(http.MethodPost, "/host", body)
 		req.Header.Set(contract.HostCredentialHeader, "secret")
@@ -184,7 +184,7 @@ var _ = Describe("Callback endpoint retirement", func() {
 		default:
 		}
 		Expect(f.callbackDenied("fine-tuning", "status", 1, "inc")).To(BeTrue())
-		other := &fixture{b: b, inflight: f, h: b.HandlerForRuntime("other", "other-secret", []string{"workspace."}, 1, "other-inc")}
+		other := &fixture{b: b, inflight: f, h: b.HandlerForRuntime("other", "other-secret", NewStaticAuthority(map[string][]string{"other": []string{"workspace."}}), 1, "other-inc")}
 		defer f.BeginRuntime(env("other", "ordinary", "read", time.Now().Add(time.Minute)), Binding{}, false, "other-inc")()
 		code, _ := other.call("other-secret", "ordinary", "workspace.export", `{}`)
 		Expect(code).To(Equal(http.StatusOK))
@@ -213,7 +213,7 @@ var _ = Describe("Decoded callback dispatch retirement", func() {
 			calls.Add(1)
 			return json.RawMessage(`{}`), nil
 		}})).To(Succeed())
-		h := b.EndpointForRuntime("fine-tuning", "secret", []string{"workspace."}, 1, "inc")
+		h := b.EndpointForRuntime("fine-tuning", "secret", NewStaticAuthority(map[string][]string{"fine-tuning": []string{"workspace."}}), 1, "inc")
 		defer f.BeginRuntime(env("fine-tuning", "ordinary", "read", time.Now().Add(time.Minute)), Binding{}, false, "inc")()
 		fixture := &fixture{h: h}
 		result := make(chan int, 1)
@@ -243,7 +243,7 @@ var _ = Describe("Decoded callback dispatch retirement", func() {
 			h.Stop()  // No lifecycle lock may be held across the handler or Drain.
 			return json.RawMessage(`{}`), nil
 		}})).To(Succeed())
-		h = b.EndpointForRuntime("fine-tuning", "secret", []string{"connector."}, 1, "inc")
+		h = b.EndpointForRuntime("fine-tuning", "secret", NewStaticAuthority(map[string][]string{"fine-tuning": []string{"connector."}}), 1, "inc")
 		fixture := &fixture{h: h}
 		done := make(chan struct{})
 		go func() { fixture.call("secret", "ordinary", "connector.inbound", `{}`); close(done) }()
diff --git a/core/services/addons/manager.go b/core/services/addons/manager.go
index 0d87634826..20f7cc5635 100644
--- a/core/services/addons/manager.go
+++ b/core/services/addons/manager.go
@@ -14,6 +14,7 @@ import (
 	"sort"
 	"strings"
 	"sync"
+	"sync/atomic"
 	"syscall"
 	"time"
 
@@ -21,6 +22,7 @@ import (
 
 	"github.com/mudler/LocalAI/core/services/addons/apps"
 	"github.com/mudler/LocalAI/core/services/addons/catalog"
+	"github.com/mudler/LocalAI/core/services/addons/hostops"
 	"github.com/mudler/LocalAI/core/services/addons/packages"
 	"github.com/mudler/LocalAI/core/services/addons/recovery"
 	addonruntime "github.com/mudler/LocalAI/core/services/addons/runtime"
@@ -158,6 +160,33 @@ type Manager struct {
 	// add-on. The apps list reads it to decide which host controls it draws.
 	hostOps    map[string][]string
 	hostOpsSet bool
+	// authority answers what each add-on may call now. Nil means the startup
+	// snapshot in hostOps. It is read on every admission and every listing,
+	// so a grant or a revoke applies without a restart.
+	authority atomic.Pointer[hostops.Authority]
+	floor     atomic.Pointer[hostops.Authority]
+}
+
+// SetAuthority sets the Authority that admission and the apps list ask. The
+// first call wins; set it before attaching the runtime. Without it the
+// startup snapshot of SetHostOps is the authority.
+func (m *Manager) SetAuthority(a hostops.Authority) {
+	if a == nil {
+		return
+	}
+	m.authority.CompareAndSwap(nil, &a)
+}
+
+// hostAuthority is the Authority in force: the one set, or the startup
+// snapshot of host operation prefixes.
+func (m *Manager) hostAuthority() hostops.Authority {
+	if a := m.authority.Load(); a != nil {
+		return *a
+	}
+	if f := m.floor.Load(); f != nil {
+		return *f
+	}
+	return hostops.NewStaticAuthority(nil)
 }
 
 // SetHostOps sets the host operation grants of the add-ons (the host setting,
@@ -175,6 +204,8 @@ func (m *Manager) SetHostOps(ops map[string][]string) {
 	for id, prefixes := range ops {
 		m.hostOps[id] = slices.Clone(prefixes)
 	}
+	floor := hostops.NewStaticAuthority(m.hostOps)
+	m.floor.Store(&floor)
 }
 
 // SkillSync copies the skills of an add-on package into the chats' skill layer
@@ -1231,7 +1262,7 @@ func (m *Manager) Apps(ctx context.Context, actor contract.Actor) ([]apps.App, e
 		if !ok {
 			continue
 		}
-		snap := apps.Snapshot{AddonID: id, InstalledAt: st.InstalledAt, Installed: st.Installed, Enabled: st.DesiredEnabled, Generation: st.Generation, State: addonruntime.StateStopped, Receipt: receipt, HostOps: m.hostOps[id]}
+		snap := apps.Snapshot{AddonID: id, InstalledAt: st.InstalledAt, Installed: st.Installed, Enabled: st.DesiredEnabled, Generation: st.Generation, State: addonruntime.StateStopped, Receipt: receipt, HostOps: held(m.hostAuthority(), id)}
 		if st.DesiredEnabled && m.runtime != nil {
 			snap.State = m.runtime.State(id, st.Generation)
 		}
diff --git a/core/services/addons/runtime/observation_test.go b/core/services/addons/runtime/observation_test.go
index 7f4559a010..2595d2c2df 100644
--- a/core/services/addons/runtime/observation_test.go
+++ b/core/services/addons/runtime/observation_test.go
@@ -68,7 +68,7 @@ var _ = Describe("Host-only observation read", func() {
 			calls.Add(1)
 			return json.RawMessage(`{}`), nil
 		}})).To(Succeed())
-		callback = b.HandlerForRuntime("sample", "secret", []string{"connector."}, 1, "inc")
+		callback = b.HandlerForRuntime("sample", "secret", hostops.NewStaticAuthority(map[string][]string{"sample": []string{"connector."}}), 1, "inc")
 		_, err := c.ReadObservation(context.Background(), env(), "q")
 		Expect(err).To(HaveOccurred())
 		Expect(code.Load()).To(Equal(int32(403)))
@@ -115,7 +115,7 @@ var _ = Describe("Host-only observation read", func() {
 			Expect(err).NotTo(HaveOccurred())
 		})
 		Expect(b.Register(hostops.Spec{Op: "workspace.export", Scope: "read", Feature: "chats", Handler: func(context.Context, hostops.Call) (json.RawMessage, error) { return json.RawMessage(`{}`), nil }})).To(Succeed())
-		callback = b.HandlerForRuntime("sample", "secret", []string{"workspace."}, 1, "inc")
+		callback = b.HandlerForRuntime("sample", "secret", hostops.NewStaticAuthority(map[string][]string{"sample": []string{"workspace."}}), 1, "inc")
 		done := make(chan error, 1)
 		go func() { _, err := c.ReadObservation(context.Background(), env(), "q"); done <- err }()
 		<-entered
diff --git a/core/services/addons/runtime/supervisor.go b/core/services/addons/runtime/supervisor.go
index 051a76e747..fbc07e599c 100644
--- a/core/services/addons/runtime/supervisor.go
+++ b/core/services/addons/runtime/supervisor.go
@@ -72,8 +72,9 @@ type Config struct {
 	DataRoot                   string
 	Limits                     contract.Limits
 	ReadyTimeout, StableHealth time.Duration
-	// HostOps, when set, gives each add-on that its Allowed map names a
-	// host operation endpoint. Nil means no add-on gets one.
+	// HostOps, when set, gives each add-on that holds a host operation, or
+	// declares one in its manifest, a host operation endpoint. Nil means no
+	// add-on gets one.
 	HostOps *HostOps
 	// Output receives each line an add-on writes to its standard output
 	// (stream "stdout") or error ("stderr"). Nil sends the lines to the LocalAI
@@ -81,21 +82,28 @@ type Config struct {
 	Output func(addonID, stream, line string)
 }
 
-// HostOps wires the host operation channel into the supervisor. Allowed maps
-// an add-on ID to the operation prefixes it may call; an add-on that is not a
-// key gets no endpoint and no credential. InFlight records the envelope of
-// each request while the add-on serves it.
+// HostOps wires the host operation channel into the supervisor. Authority
+// decides, on every call, what an add-on may run; it is not copied at start, so
+// a grant or a revoke applies without a restart. An add-on gets an endpoint and
+// a credential when it holds an operation or its manifest declares one: a
+// declared operation that is not granted yet is refused by the endpoint, and a
+// later grant works at once. An add-on with neither gets none. InFlight records
+// the envelope of each request while the add-on serves it.
 type HostOps struct {
-	Broker   *hostops.Broker
-	InFlight *hostops.InFlight
-	Allowed  map[string][]string
+	Broker    *hostops.Broker
+	InFlight  *hostops.InFlight
+	Authority hostops.Authority
 }
 
-func (h *HostOps) prefixes(id string) []string {
-	if h == nil || h.Broker == nil || h.InFlight == nil {
-		return nil
+// wants reports whether the add-on gets a host operation endpoint.
+func (h *HostOps) wants(id string, declared *contract.HostOperations) bool {
+	if h == nil || h.Broker == nil || h.InFlight == nil || h.Authority == nil {
+		return false
 	}
-	return h.Allowed[id]
+	if declared != nil && len(declared.Required)+len(declared.Optional) > 0 {
+		return true
+	}
+	return h.Authority.Entitled(id)
 }
 
 type Registration struct {
@@ -321,9 +329,8 @@ func (s *Supervisor) launch(ctx context.Context, pkg packages.PackageReceipt, ge
 	// failed launch, and by serveHostOps when the process ends.
 	var hostListener net.Listener
 	var hostCredential string
-	hostPrefixes := s.config.HostOps.prefixes(pkg.Manifest.ID)
 	hostReady := false
-	if len(hostPrefixes) > 0 {
+	if s.config.HostOps.wants(pkg.Manifest.ID, pkg.Manifest.Capabilities.HostOperations) {
 		hostListener, e = net.ListenTCP("tcp4", &net.TCPAddr{IP: net.IPv4(127, 0, 0, 1)})
 		if e != nil {
 			return nil, ErrRuntime
@@ -432,7 +439,7 @@ func (s *Supervisor) launch(ctx context.Context, pkg packages.PackageReceipt, ge
 			return nil, ErrRuntime
 		}
 		c.inflight = s.config.HostOps.InFlight
-		s.serveHostOps(p, hostListener, pkg.Manifest.ID, hostCredential, hostPrefixes)
+		s.serveHostOps(p, hostListener, pkg.Manifest.ID, hostCredential)
 	}
 	ident, identityErr := identity(cmd.Process.Pid)
 	ident.Incarnation = r.Incarnation
@@ -494,8 +501,8 @@ func (s *Supervisor) launch(ctx context.Context, pkg packages.PackageReceipt, ge
 // serveHostOps serves the host operation channel of one incarnation and
 // stops admission when the process ends. Cleanup drains active requests before
 // releasing correlations; a handler ignoring cancellation cannot block terminate.
-func (s *Supervisor) serveHostOps(p *process, l net.Listener, id, credential string, prefixes []string) {
-	endpoint := s.config.HostOps.Broker.EndpointForRuntime(id, credential, prefixes, p.registration.Generation, p.registration.Incarnation)
+func (s *Supervisor) serveHostOps(p *process, l net.Listener, id, credential string) {
+	endpoint := s.config.HostOps.Broker.EndpointForRuntime(id, credential, s.config.HostOps.Authority, p.registration.Generation, p.registration.Incarnation)
 	srv := &http.Server{Handler: endpoint, ReadHeaderTimeout: 5 * time.Second, MaxHeaderBytes: 16 << 10}
 	go func() { _ = srv.Serve(l) }()
 	go func() {
diff --git a/core/services/addons/runtime/supervisor_test.go b/core/services/addons/runtime/supervisor_test.go
index 0021347d87..98336f5e03 100644
--- a/core/services/addons/runtime/supervisor_test.go
+++ b/core/services/addons/runtime/supervisor_test.go
@@ -681,6 +681,7 @@ var _ = Describe("Addon data directory", func() {
 		entries, _ := os.ReadDir(root)
 		Expect(entries).To(BeEmpty())
 	})
+	var hostOpsSupervisorWith func(hostops.Authority) (*Supervisor, *hostops.InFlight)
 	hostOpsSeen := func(p packages.PackageReceipt) (endpoint, credential string) {
 		var b []byte
 		Eventually(func() error {
@@ -692,6 +693,9 @@ var _ = Describe("Addon data directory", func() {
 		return parts[0], parts[1]
 	}
 	hostOpsSupervisor := func(allowed map[string][]string) (*Supervisor, *hostops.InFlight) {
+		return hostOpsSupervisorWith(hostops.NewStaticAuthority(allowed))
+	}
+	hostOpsSupervisorWith = func(auth hostops.Authority) (*Supervisor, *hostops.InFlight) {
 		l := contract.DefaultLimits()
 		l.ReadTimeout = 300 * time.Millisecond
 		l.ShutdownTimeout = 100 * time.Millisecond
@@ -700,7 +704,7 @@ var _ = Describe("Addon data directory", func() {
 		Expect(b.Register(hostops.Spec{Op: "finetune.get", Scope: "read", Feature: "fine_tuning", Handler: func(context.Context, hostops.Call) (json.RawMessage, error) {
 			return json.RawMessage(`{"ok":true}`), nil
 		}})).To(Succeed())
-		s, e := NewSupervisor(Config{StateRoot: GinkgoT().TempDir(), Limits: l, ReadyTimeout: 2 * time.Second, StableHealth: time.Second, HostOps: &HostOps{Broker: b, InFlight: in, Allowed: allowed}})
+		s, e := NewSupervisor(Config{StateRoot: GinkgoT().TempDir(), Limits: l, ReadyTimeout: 2 * time.Second, StableHealth: time.Second, HostOps: &HostOps{Broker: b, InFlight: in, Authority: auth}})
 		Expect(e).NotTo(HaveOccurred())
 		DeferCleanup(func() { Expect(s.Close(context.Background())).To(Succeed()) })
 		return s, in
@@ -735,6 +739,37 @@ var _ = Describe("Addon data directory", func() {
 		Expect(call(credential)).To(Equal(http.StatusForbidden))
 	})
 
+	It("opens an endpoint for a declared operation that is not granted, and a later grant works with no restart", func() {
+		auth := &switchAuthority{}
+		s, in := hostOpsSupervisorWith(auth)
+		p := withID("sample")
+		p.Manifest.Capabilities.HostOperations = &contract.HostOperations{Optional: []string{"finetune.get"}}
+		raw, e := json.Marshal(p)
+		Expect(e).NotTo(HaveOccurred())
+		Expect(os.Chmod(filepath.Join(p.Directory, "receipt.json"), 0600)).To(Succeed())
+		Expect(os.WriteFile(filepath.Join(p.Directory, "receipt.json"), raw, 0400)).To(Succeed())
+		inst, e := s.Start(context.Background(), p, 1)
+		Expect(e).NotTo(HaveOccurred())
+		endpoint, credential := hostOpsSeen(p)
+		Expect(endpoint).To(HavePrefix("http://127.0.0.1:"))
+		call := func() int {
+			body := strings.NewReader(`{"operationId":"op1","op":"finetune.get","arguments":{}}`)
+			req, _ := http.NewRequest("POST", endpoint+"/host", body)
+			req.Header.Set(contract.HostCredentialHeader, credential)
+			resp, e := http.DefaultClient.Do(req)
+			Expect(e).NotTo(HaveOccurred())
+			_ = resp.Body.Close()
+			return resp.StatusCode
+		}
+		end := in.BeginRuntime(contract.Envelope{Request: contract.Request{AddonID: "sample", OperationID: "op1", Generation: 1, Action: "a", Arguments: json.RawMessage(`{}`)}, Authority: contract.Authority{Actor: contract.Actor{UserID: "u", CredentialID: "c", Mode: "named-user"}, Scope: "read", ExpiresAt: time.Now().Add(time.Minute)}}, hostops.Binding{}, false, inst.Incarnation)
+		defer end()
+		Expect(call()).To(Equal(http.StatusForbidden))
+		auth.grant.Store(true)
+		Expect(call()).To(Equal(http.StatusOK))
+		auth.grant.Store(false)
+		Expect(call()).To(Equal(http.StatusForbidden))
+	})
+
 	It("gives an add-on that the host setting does not name no host endpoint", func() {
 		s, _ := hostOpsSupervisor(map[string][]string{"other": {"finetune."}})
 		p := withID("sample")
@@ -768,3 +803,15 @@ var _ = Describe("Addon data directory", func() {
 		}, 2*time.Second).Should(HaveOccurred())
 	})
 })
+
+// switchAuthority grants finetune.get to every add-on while grant is set.
+type switchAuthority struct{ grant atomic.Bool }
+
+func (a *switchAuthority) Allows(_, op string) (bool, hostops.Reason) {
+	if a.grant.Load() && op == "finetune.get" {
+		return true, hostops.ReasonNone
+	}
+	return false, hostops.ReasonNotGranted
+}
+func (a *switchAuthority) Snapshot(string) hostops.EffectiveSet { return hostops.EffectiveSet{} }
+func (a *switchAuthority) Entitled(string) bool                 { return a.grant.Load() }
diff --git a/tests/addons/actione2e/actions_e2e_test.go b/tests/addons/actione2e/actions_e2e_test.go
index 781748537a..77947fa3c2 100644
--- a/tests/addons/actione2e/actions_e2e_test.go
+++ b/tests/addons/actione2e/actions_e2e_test.go
@@ -143,7 +143,7 @@ func startAddonFrom(id, packageDir string) *world {
 	sup, err := addonruntime.NewSupervisor(addonruntime.Config{
 		StateRoot: filepath.Join(root, "state"), DataRoot: dataRoot, Limits: limits,
 		ReadyTimeout: 20 * time.Second, StableHealth: time.Second,
-		HostOps: &addonruntime.HostOps{Broker: broker, InFlight: inflight, Allowed: map[string][]string{id: {"workspace."}}},
+		HostOps: &addonruntime.HostOps{Broker: broker, InFlight: inflight, Authority: hostops.NewStaticAuthority(map[string][]string{id: {"workspace."}})},
 	})
 	Expect(err).NotTo(HaveOccurred())
 	DeferCleanup(func() { _ = sup.Close(context.Background()) })