diff --git a/internal/gateway/client_testing.go b/internal/gateway/client_testing.go
new file mode 100644
index 00000000..b7bb400f
--- /dev/null
+++ b/internal/gateway/client_testing.go
@@ -0,0 +1,23 @@
+package gateway
+
+import (
+	"github.com/google/uuid"
+
+	"github.com/nextlevelbuilder/goclaw/internal/permissions"
+)
+
+// NewTestClient returns a minimally-wired Client for unit tests in other
+// packages. Role + tenant are set directly because the underlying fields are
+// unexported. SendResponse is safe because the send channel is nil — the
+// writer hits the default branch of the select and drops the frame silently.
+//
+// Not for production use. Any non-test caller should use NewClient instead.
+func NewTestClient(role permissions.Role, tenantID uuid.UUID, userID string) *Client {
+	return &Client{
+		id:            uuid.NewString(),
+		authenticated: true,
+		role:          role,
+		userID:        userID,
+		tenantID:      tenantID,
+	}
+}
diff --git a/internal/gateway/methods/api_keys.go b/internal/gateway/methods/api_keys.go
index a3bf1f29..25d38370 100644
--- a/internal/gateway/methods/api_keys.go
+++ b/internal/gateway/methods/api_keys.go
@@ -163,6 +163,14 @@ func (m *APIKeysMethods) handleCreate(ctx context.Context, client *gateway.Clien
 	}))
 }
 
+// handleRevoke revokes an API key after verifying ownership.
+//
+// Phase 0b hotfix: store-layer Revoke SQL matches on
+// `tenant_id = $N OR tenant_id IS NULL`, which previously allowed any
+// tenant admin to revoke system-level (NULL-tenant) API keys. The fix
+// pre-fetches the key and enforces strict tenant match for non-owner
+// callers. Non-admin callers continue to use the ownerID filter path
+// (unchanged behaviour for personal keys).
 func (m *APIKeysMethods) handleRevoke(ctx context.Context, client *gateway.Client, req *protocol.RequestFrame) {
 	locale := store.LocaleFromContext(ctx)
 
@@ -182,12 +190,40 @@ func (m *APIKeysMethods) handleRevoke(ctx context.Context, client *gateway.Clien
 		return
 	}
 
-	// Non-admin callers can only revoke their own keys.
+	// Non-admin callers can only revoke their own keys — personal-key path,
+	// ownerID filter enforced by the store layer.
 	ownerID := ""
 	if !permissions.HasMinRole(client.Role(), permissions.RoleAdmin) {
 		ownerID = client.UserID()
 	}
 
+	// Admin path: verify the target key belongs to the caller's tenant (or
+	// caller is a system owner) before revoking. Personal-key path skips
+	// this because the ownerID filter already scopes to the caller.
+	//
+	// NOTE: Use client.IsOwner() — NOT store.IsOwnerRole(ctx). The WS router
+	// does not inject role into ctx (see router.go handleRequest), so the
+	// ctx-based helper is dead here. Client carries the authoritative role
+	// from connect.
+	if ownerID == "" && !client.IsOwner() {
+		key, gerr := m.apiKeys.Get(ctx, id)
+		if gerr != nil || key == nil {
+			client.SendResponse(protocol.NewErrorResponse(req.ID, protocol.ErrNotFound, i18n.T(locale, i18n.MsgNotFound, "API key", params.ID)))
+			return
+		}
+		callerTID := store.TenantIDFromContext(ctx)
+		if key.TenantID == uuid.Nil || key.TenantID != callerTID {
+			slog.Warn("security.api_key_revoke_forbidden",
+				"key_id", params.ID,
+				"caller_tenant", callerTID,
+				"key_tenant", key.TenantID,
+				"user_id", client.UserID(),
+			)
+			client.SendResponse(protocol.NewErrorResponse(req.ID, protocol.ErrUnauthorized, i18n.T(locale, i18n.MsgPermissionDenied, "API key")))
+			return
+		}
+	}
+
 	if err := m.apiKeys.Revoke(ctx, id, ownerID); err != nil {
 		slog.Error("api_keys.revoke failed", "error", err, "id", params.ID)
 		client.SendResponse(protocol.NewErrorResponse(req.ID, protocol.ErrNotFound, i18n.T(locale, i18n.MsgNotFound, "API key", params.ID)))
diff --git a/internal/gateway/methods/api_keys_tenant_guard_test.go b/internal/gateway/methods/api_keys_tenant_guard_test.go
new file mode 100644
index 00000000..74b2a2d0
--- /dev/null
+++ b/internal/gateway/methods/api_keys_tenant_guard_test.go
@@ -0,0 +1,236 @@
+package methods
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"slices"
+	"sync"
+	"testing"
+
+	"github.com/google/uuid"
+
+	"github.com/nextlevelbuilder/goclaw/internal/gateway"
+	"github.com/nextlevelbuilder/goclaw/internal/permissions"
+	"github.com/nextlevelbuilder/goclaw/internal/store"
+	"github.com/nextlevelbuilder/goclaw/pkg/protocol"
+)
+
+// Phase 0b review regression coverage: WS api_keys.revoke.
+//
+// The HTTP fix in internal/http/api_keys.go has its own test file, but the
+// original Phase 0b WS fix (internal/gateway/methods/api_keys.go) had zero
+// test coverage — and a Major bug slipped past: store.IsOwnerRole(ctx)
+// always returns false in WS handlers because the router does not inject
+// role into ctx. The bug was caught by code review, not tests. These tests
+// lock the fix in place and cover the four critical paths.
+
+// ---- minimal stub store ----
+
+type stubAPIKeyStore struct {
+	mu           sync.Mutex
+	byID         map[uuid.UUID]*store.APIKeyData
+	revokedCalls []uuid.UUID
+}
+
+func newStubAPIKeyStore() *stubAPIKeyStore {
+	return &stubAPIKeyStore{byID: make(map[uuid.UUID]*store.APIKeyData)}
+}
+
+func (s *stubAPIKeyStore) Create(_ context.Context, k *store.APIKeyData) error {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	s.byID[k.ID] = k
+	return nil
+}
+
+func (s *stubAPIKeyStore) Get(_ context.Context, id uuid.UUID) (*store.APIKeyData, error) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	if k, ok := s.byID[id]; ok {
+		return k, nil
+	}
+	return nil, errors.New("not found")
+}
+
+func (s *stubAPIKeyStore) GetByHash(_ context.Context, _ string) (*store.APIKeyData, error) {
+	return nil, nil
+}
+
+func (s *stubAPIKeyStore) List(_ context.Context, _ string) ([]store.APIKeyData, error) {
+	return nil, nil
+}
+
+func (s *stubAPIKeyStore) Revoke(_ context.Context, id uuid.UUID, _ string) error {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	s.revokedCalls = append(s.revokedCalls, id)
+	if k, ok := s.byID[id]; ok {
+		k.Revoked = true
+	}
+	return nil
+}
+
+func (s *stubAPIKeyStore) TouchLastUsed(_ context.Context, _ uuid.UUID) error { return nil }
+
+func (s *stubAPIKeyStore) wasRevoked(id uuid.UUID) bool {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	return slices.Contains(s.revokedCalls, id)
+}
+
+// wsCallCtx mirrors what router.handleRequest injects into ctx for method
+// handlers: locale, tenantID (from client.TenantID()), and role (added
+// by Phase 0b hardening). Tests bypass the router, so we reproduce the
+// minimum set the handler reads.
+func wsCallCtx(client *gateway.Client) context.Context {
+	ctx := context.Background()
+	if tid := client.TenantID(); tid != uuid.Nil {
+		ctx = store.WithTenantID(ctx, tid)
+	}
+	if role := client.Role(); role != "" {
+		ctx = store.WithRole(ctx, string(role))
+	}
+	return ctx
+}
+
+// ---- harness ----
+
+func buildRevokeRequest(t *testing.T, keyID uuid.UUID) *protocol.RequestFrame {
+	t.Helper()
+	raw, err := json.Marshal(map[string]string{"id": keyID.String()})
+	if err != nil {
+		t.Fatalf("marshal: %v", err)
+	}
+	return &protocol.RequestFrame{
+		Type:   protocol.FrameTypeRequest,
+		ID:     "revoke-req-1",
+		Method: protocol.MethodAPIKeysRevoke,
+		Params: raw,
+	}
+}
+
+// ---- tests ----
+
+// TestWSRevoke_TenantAdmin_CrossTenantKey_Denied is the core HIGH finding:
+// a tenant admin attempting to revoke a key owned by another tenant must
+// be rejected, and Revoke must not be called on the store.
+func TestWSRevoke_TenantAdmin_CrossTenantKey_Denied(t *testing.T) {
+	callerTID := uuid.MustParse("11111111-1111-1111-1111-111111111111")
+	keyOwnerTID := uuid.MustParse("22222222-2222-2222-2222-222222222222")
+	keyID := uuid.New()
+
+	stub := newStubAPIKeyStore()
+	_ = stub.Create(context.Background(), &store.APIKeyData{
+		ID:       keyID,
+		Name:     "other-tenant-key",
+		TenantID: keyOwnerTID,
+	})
+
+	m := &APIKeysMethods{apiKeys: stub}
+	client := gateway.NewTestClient(permissions.RoleAdmin, callerTID, "user-1")
+
+	m.handleRevoke(wsCallCtx(client), client, buildRevokeRequest(t, keyID))
+
+	if stub.wasRevoked(keyID) {
+		t.Fatalf("cross-tenant key should NOT have been revoked")
+	}
+}
+
+// TestWSRevoke_TenantAdmin_SystemKey_Denied is the second HIGH path: the
+// NULL-tenant (system) key must not be revocable by a tenant admin.
+func TestWSRevoke_TenantAdmin_SystemKey_Denied(t *testing.T) {
+	callerTID := uuid.MustParse("33333333-3333-3333-3333-333333333333")
+	keyID := uuid.New()
+
+	stub := newStubAPIKeyStore()
+	_ = stub.Create(context.Background(), &store.APIKeyData{
+		ID:       keyID,
+		Name:     "system-ci-key",
+		TenantID: uuid.Nil, // NULL-tenant system key
+	})
+
+	m := &APIKeysMethods{apiKeys: stub}
+	client := gateway.NewTestClient(permissions.RoleAdmin, callerTID, "user-1")
+
+	m.handleRevoke(wsCallCtx(client), client, buildRevokeRequest(t, keyID))
+
+	if stub.wasRevoked(keyID) {
+		t.Fatalf("system (NULL-tenant) key should NOT have been revoked by tenant admin")
+	}
+}
+
+// TestWSRevoke_SystemOwner_SystemKey_Allowed is the regression caught by
+// code review: the original Phase 0b fix used store.IsOwnerRole(ctx),
+// which returns false in WS because the router does not inject role into
+// ctx. This test exercises the now-correct client.IsOwner() path.
+func TestWSRevoke_SystemOwner_SystemKey_Allowed(t *testing.T) {
+	keyID := uuid.New()
+
+	stub := newStubAPIKeyStore()
+	_ = stub.Create(context.Background(), &store.APIKeyData{
+		ID:       keyID,
+		Name:     "system-ci-key",
+		TenantID: uuid.Nil,
+	})
+
+	m := &APIKeysMethods{apiKeys: stub}
+	// Owner client — narrowed-to-master tenant scope is the default for
+	// owner logins per router.applyTenantScope.
+	client := gateway.NewTestClient(permissions.RoleOwner, store.MasterTenantID, "owner-1")
+
+	m.handleRevoke(wsCallCtx(client), client, buildRevokeRequest(t, keyID))
+
+	if !stub.wasRevoked(keyID) {
+		t.Fatalf("system owner must be allowed to revoke NULL-tenant system key")
+	}
+}
+
+// TestWSRevoke_TenantAdmin_OwnTenantKey_Allowed is the happy path: admin
+// revoking a key inside their own tenant — no regression for legitimate
+// scope-matching revocations.
+func TestWSRevoke_TenantAdmin_OwnTenantKey_Allowed(t *testing.T) {
+	tid := uuid.MustParse("44444444-4444-4444-4444-444444444444")
+	keyID := uuid.New()
+
+	stub := newStubAPIKeyStore()
+	_ = stub.Create(context.Background(), &store.APIKeyData{
+		ID:       keyID,
+		Name:     "own-tenant-key",
+		TenantID: tid,
+	})
+
+	m := &APIKeysMethods{apiKeys: stub}
+	client := gateway.NewTestClient(permissions.RoleAdmin, tid, "user-1")
+
+	m.handleRevoke(wsCallCtx(client), client, buildRevokeRequest(t, keyID))
+
+	if !stub.wasRevoked(keyID) {
+		t.Fatalf("own-tenant key must be revocable by same-tenant admin")
+	}
+}
+
+// TestWSRevoke_SystemOwner_CrossTenantKey_Allowed documents the intentional
+// behaviour: a system owner narrowed to the master scope can still revoke
+// keys belonging to other tenants (operator-level housekeeping). If this
+// is ever tightened, update both the test and the handler comment.
+func TestWSRevoke_SystemOwner_CrossTenantKey_Allowed(t *testing.T) {
+	otherTID := uuid.MustParse("55555555-5555-5555-5555-555555555555")
+	keyID := uuid.New()
+
+	stub := newStubAPIKeyStore()
+	_ = stub.Create(context.Background(), &store.APIKeyData{
+		ID:       keyID,
+		Name:     "tenant-specific-key",
+		TenantID: otherTID,
+	})
+
+	m := &APIKeysMethods{apiKeys: stub}
+	client := gateway.NewTestClient(permissions.RoleOwner, store.MasterTenantID, "owner-1")
+
+	m.handleRevoke(wsCallCtx(client), client, buildRevokeRequest(t, keyID))
+
+	if !stub.wasRevoked(keyID) {
+		t.Fatalf("system owner must be allowed to revoke cross-tenant keys")
+	}
+}
diff --git a/internal/gateway/methods/config.go b/internal/gateway/methods/config.go
index 6fd07206..5712d64e 100644
--- a/internal/gateway/methods/config.go
+++ b/internal/gateway/methods/config.go
@@ -5,7 +5,6 @@ import (
 	"encoding/json"
 	"log/slog"
 
-	"github.com/google/uuid"
 	"github.com/titanous/json5"
 
 	"github.com/nextlevelbuilder/goclaw/internal/bus"
@@ -65,9 +64,12 @@ func (m *ConfigMethods) requireOwner(next gateway.MethodHandler) gateway.MethodH
 // on-disk config.json. A non-master tenant admin calling config.patch would
 // corrupt master state + leak master config to other tenants. This guard keeps
 // config.* strictly master-scoped until a tenant-aware refactor lands.
+//
+// Shares the predicate with store.IsMasterScope so HTTP and WS layers can't
+// drift — same rule, one source of truth.
 func (m *ConfigMethods) requireMasterScope(next gateway.MethodHandler) gateway.MethodHandler {
 	return func(ctx context.Context, client *gateway.Client, req *protocol.RequestFrame) {
-		if !isMasterScopeContext(ctx) {
+		if !store.IsMasterScope(ctx) {
 			locale := store.LocaleFromContext(ctx)
 			client.SendResponse(protocol.NewErrorResponse(
 				req.ID,
@@ -80,18 +82,6 @@ func (m *ConfigMethods) requireMasterScope(next gateway.MethodHandler) gateway.M
 	}
 }
 
-// isMasterScopeContext returns true when ctx should be treated as master-scope:
-// (a) system owner role (bypass-all), or
-// (b) tenant id is unset (uuid.Nil — legacy / system callers), or
-// (c) tenant id equals store.MasterTenantID.
-func isMasterScopeContext(ctx context.Context) bool {
-	if store.IsOwnerRole(ctx) {
-		return true
-	}
-	tid := store.TenantIDFromContext(ctx)
-	return tid == uuid.Nil || tid == store.MasterTenantID
-}
-
 func (m *ConfigMethods) handleGet(_ context.Context, client *gateway.Client, req *protocol.RequestFrame) {
 	client.SendResponse(protocol.NewOKResponse(req.ID, map[string]any{
 		"config": m.cfg.MaskedCopy(),
diff --git a/internal/gateway/methods/config_tenant_guard_test.go b/internal/gateway/methods/config_tenant_guard_test.go
index 5aa003cd..5825264e 100644
--- a/internal/gateway/methods/config_tenant_guard_test.go
+++ b/internal/gateway/methods/config_tenant_guard_test.go
@@ -11,13 +11,13 @@ import (
 	"github.com/nextlevelbuilder/goclaw/pkg/protocol"
 )
 
-// ---- Tests: isMasterScopeContext helper ----
+// ---- Tests: store.IsMasterScope helper ----
 
 func TestIsMasterScopeContext_OwnerRole_Allowed(t *testing.T) {
 	ctx := store.WithRole(context.Background(), store.RoleOwner)
 	// Tenant set to a non-master tenant — owner role must still pass
 	ctx = store.WithTenantID(ctx, uuid.MustParse("11111111-1111-1111-1111-111111111111"))
-	if !isMasterScopeContext(ctx) {
+	if !store.IsMasterScope(ctx) {
 		t.Fatalf("owner role with non-master tenant should be allowed")
 	}
 }
@@ -25,14 +25,14 @@ func TestIsMasterScopeContext_OwnerRole_Allowed(t *testing.T) {
 func TestIsMasterScopeContext_NilTenant_Allowed(t *testing.T) {
 	// Legacy / system callers without tenant scope → treated as master
 	ctx := context.Background()
-	if !isMasterScopeContext(ctx) {
+	if !store.IsMasterScope(ctx) {
 		t.Fatalf("nil tenant ctx should be allowed (master-scope fallback)")
 	}
 }
 
 func TestIsMasterScopeContext_MasterTenant_Allowed(t *testing.T) {
 	ctx := store.WithTenantID(context.Background(), store.MasterTenantID)
-	if !isMasterScopeContext(ctx) {
+	if !store.IsMasterScope(ctx) {
 		t.Fatalf("master tenant ctx should be allowed")
 	}
 }
@@ -40,7 +40,7 @@ func TestIsMasterScopeContext_MasterTenant_Allowed(t *testing.T) {
 func TestIsMasterScopeContext_NonMasterTenantNoOwner_Denied(t *testing.T) {
 	tid := uuid.MustParse("22222222-2222-2222-2222-222222222222")
 	ctx := store.WithTenantID(context.Background(), tid)
-	if isMasterScopeContext(ctx) {
+	if store.IsMasterScope(ctx) {
 		t.Fatalf("non-master tenant ctx without owner role must be denied")
 	}
 }
@@ -50,7 +50,7 @@ func TestIsMasterScopeContext_NonMasterTenantWithOwnerRole_Allowed(t *testing.T)
 	tid := uuid.MustParse("33333333-3333-3333-3333-333333333333")
 	ctx := store.WithTenantID(context.Background(), tid)
 	ctx = store.WithRole(ctx, store.RoleOwner)
-	if !isMasterScopeContext(ctx) {
+	if !store.IsMasterScope(ctx) {
 		t.Fatalf("owner role must bypass tenant scope check")
 	}
 }
diff --git a/internal/gateway/router.go b/internal/gateway/router.go
index 5972bf7b..0ac57b02 100644
--- a/internal/gateway/router.go
+++ b/internal/gateway/router.go
@@ -78,8 +78,11 @@ func (r *MethodRouter) Handle(ctx context.Context, client *Client, req *protocol
 		}
 	}
 
-	// Inject locale + tenant into context.
+	// Inject locale + tenant + role into context.
 	// All connect paths guarantee client.tenantID is set (owner defaults to MasterTenantID).
+	// Role injection is required so store.IsOwnerRole / store.IsMasterScope work
+	// from WS handlers — without it, ctx-based permission helpers silently
+	// evaluate as non-owner. HTTP layer does the same via enrichContext.
 	ctx = store.WithLocale(ctx, i18n.Normalize(client.locale))
 	if client.TenantID() != uuid.Nil {
 		ctx = store.WithTenantID(ctx, client.TenantID())
@@ -87,6 +90,9 @@ func (r *MethodRouter) Handle(ctx context.Context, client *Client, req *protocol
 	if slug := client.TenantSlug(); slug != "" {
 		ctx = store.WithTenantSlug(ctx, slug)
 	}
+	if role := client.Role(); role != "" {
+		ctx = store.WithRole(ctx, string(role))
+	}
 
 	slog.Debug("handling method", "method", req.Method, "client", client.id, "req_id", req.ID)
 	handler(ctx, client, req)
diff --git a/internal/http/api_key_cache_test.go b/internal/http/api_key_cache_test.go
index 6cc7dca4..ecd920ca 100644
--- a/internal/http/api_key_cache_test.go
+++ b/internal/http/api_key_cache_test.go
@@ -16,12 +16,25 @@ import (
 type mockAPIKeyStore struct {
 	mu        sync.Mutex
 	keys      map[string]*store.APIKeyData // hash → key
-	calls     int                          // GetByHash call count
-	touchedID uuid.UUID                    // last TouchLastUsed ID
+	byID      map[uuid.UUID]*store.APIKeyData
+	calls     int       // GetByHash call count
+	touchedID uuid.UUID // last TouchLastUsed ID
 }
 
 func newMockAPIKeyStore() *mockAPIKeyStore {
-	return &mockAPIKeyStore{keys: make(map[string]*store.APIKeyData)}
+	return &mockAPIKeyStore{
+		keys: make(map[string]*store.APIKeyData),
+		byID: make(map[uuid.UUID]*store.APIKeyData),
+	}
+}
+
+func (m *mockAPIKeyStore) Get(_ context.Context, id uuid.UUID) (*store.APIKeyData, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	if k, ok := m.byID[id]; ok {
+		return k, nil
+	}
+	return nil, nil
 }
 
 func (m *mockAPIKeyStore) GetByHash(_ context.Context, hash string) (*store.APIKeyData, error) {
@@ -46,7 +59,6 @@ func (m *mockAPIKeyStore) List(_ context.Context, _ string) ([]store.APIKeyData,
 	return nil, nil
 }
 func (m *mockAPIKeyStore) Revoke(_ context.Context, _ uuid.UUID, _ string) error { return nil }
-func (m *mockAPIKeyStore) Delete(_ context.Context, _ uuid.UUID, _ string) error { return nil }
 
 func (m *mockAPIKeyStore) getCalls() int {
 	m.mu.Lock()
diff --git a/internal/http/api_keys.go b/internal/http/api_keys.go
index c9ad983f..3be1245f 100644
--- a/internal/http/api_keys.go
+++ b/internal/http/api_keys.go
@@ -148,6 +148,14 @@ func (h *APIKeysHandler) handleCreate(w http.ResponseWriter, r *http.Request) {
 	})
 }
 
+// handleRevoke revokes an API key after verifying the caller owns it.
+//
+// Phase 0b hotfix: the store layer's Revoke SQL matches rows where
+// `tenant_id = $N OR tenant_id IS NULL`, which let tenant admins revoke
+// system-level (NULL-tenant) API keys belonging to CI/CD or integrations.
+// The fix pre-fetches the key and rejects any non-owner caller whose tenant
+// does not exactly match the key's tenant. System owners bypass.
+// See plans/reports/debugger-260412-0922-tenant-scope-audit.md HIGH finding.
 func (h *APIKeysHandler) handleRevoke(w http.ResponseWriter, r *http.Request) {
 	locale := extractLocale(r)
 	idStr := r.PathValue("id")
@@ -157,8 +165,35 @@ func (h *APIKeysHandler) handleRevoke(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	ctx := r.Context()
+
+	// Fetch first so ownership can be verified before any mutation.
+	key, err := h.apiKeys.Get(ctx, id)
+	if err != nil || key == nil {
+		writeError(w, http.StatusNotFound, protocol.ErrNotFound, i18n.T(locale, i18n.MsgNotFound, "API key", idStr))
+		return
+	}
+
+	// Ownership rule:
+	//   - System owner (bypass-all)      → may revoke any key
+	//   - Tenant admin in caller's tenant → may revoke only keys owned by that tenant (strict match)
+	//   - NULL-tenant (system) keys       → revocable only by system owners
+	if !store.IsOwnerRole(ctx) {
+		callerTID := store.TenantIDFromContext(ctx)
+		if key.TenantID == uuid.Nil || key.TenantID != callerTID {
+			slog.Warn("security.api_key_revoke_forbidden",
+				"key_id", idStr,
+				"caller_tenant", callerTID,
+				"key_tenant", key.TenantID,
+				"user_id", store.UserIDFromContext(ctx),
+			)
+			writeError(w, http.StatusForbidden, protocol.ErrUnauthorized, i18n.T(locale, i18n.MsgPermissionDenied, "API key"))
+			return
+		}
+	}
+
 	// HTTP revoke is admin-only (adminAuth middleware), so no owner filter needed.
-	if err := h.apiKeys.Revoke(r.Context(), id, ""); err != nil {
+	if err := h.apiKeys.Revoke(ctx, id, ""); err != nil {
 		slog.Error("api_keys.revoke failed", "error", err, "id", idStr)
 		writeError(w, http.StatusNotFound, protocol.ErrNotFound, i18n.T(locale, i18n.MsgNotFound, "API key", idStr))
 		return
diff --git a/internal/http/builtin_tools.go b/internal/http/builtin_tools.go
index b5f28f88..106ddc3e 100644
--- a/internal/http/builtin_tools.go
+++ b/internal/http/builtin_tools.go
@@ -119,6 +119,13 @@ func (h *BuiltinToolsHandler) handleGet(w http.ResponseWriter, r *http.Request)
 }
 
 func (h *BuiltinToolsHandler) handleUpdate(w http.ResponseWriter, r *http.Request) {
+	// Phase 0b hotfix: builtin_tools is a global table with no tenant_id column,
+	// so this write must be restricted to master-scope callers. Non-master tenant
+	// admins must go through PUT /v1/tools/builtin/{name}/tenant-config instead.
+	// See plans/reports/debugger-260412-0922-tenant-scope-audit.md CRITICAL-1.
+	if !requireMasterScope(w, r) {
+		return
+	}
 	locale := extractLocale(r)
 	name := r.PathValue("name")
 	if name == "" {
diff --git a/internal/http/packages.go b/internal/http/packages.go
index 126feb4c..bf2a4451 100644
--- a/internal/http/packages.go
+++ b/internal/http/packages.go
@@ -81,7 +81,15 @@ func parseAndValidatePackage(w http.ResponseWriter, r *http.Request) string {
 
 // handleInstall installs a single package.
 // Body: {"package": "github-cli"} or {"package": "pip:pandas"} or {"package": "npm:typescript"}
+//
+// Phase 0b hotfix: server-wide package installation (pip/npm/apk) must be
+// restricted to master-scope callers. Non-master tenant admins previously
+// reached this handler because the adminAuth middleware only checks role, not
+// tenant scope — a supply-chain vector (CRITICAL-2 in the audit report).
 func (h *PackagesHandler) handleInstall(w http.ResponseWriter, r *http.Request) {
+	if !requireMasterScope(w, r) {
+		return
+	}
 	pkg := parseAndValidatePackage(w, r)
 	if pkg == "" {
 		return
@@ -96,7 +104,13 @@ func (h *PackagesHandler) handleInstall(w http.ResponseWriter, r *http.Request)
 
 // handleUninstall removes a single package.
 // Body: {"package": "github-cli"} or {"package": "pip:pandas"} or {"package": "npm:typescript"}
+//
+// Phase 0b hotfix: same master-scope guard as handleInstall — uninstall can
+// break system skills, causing server-wide DoS for every tenant.
 func (h *PackagesHandler) handleUninstall(w http.ResponseWriter, r *http.Request) {
+	if !requireMasterScope(w, r) {
+		return
+	}
 	pkg := parseAndValidatePackage(w, r)
 	if pkg == "" {
 		return
diff --git a/internal/http/tenant_auth_helpers.go b/internal/http/tenant_auth_helpers.go
index 404739df..3b40fc81 100644
--- a/internal/http/tenant_auth_helpers.go
+++ b/internal/http/tenant_auth_helpers.go
@@ -1,6 +1,7 @@
 package http
 
 import (
+	"log/slog"
 	"net/http"
 
 	"github.com/google/uuid"
@@ -53,3 +54,34 @@ func requireTenantAdmin(w http.ResponseWriter, r *http.Request, ts store.TenantS
 	}
 	return true
 }
+
+// requireMasterScope guards endpoints that write to global (non-tenant-scoped)
+// tables or execute server-wide side effects (shell, filesystem). Rejects
+// callers whose ctx is scoped to a non-master tenant even if they hold
+// RoleAdmin in that tenant. System owners bypass.
+//
+// Symmetric counterpart to requireTenantAdmin: one guards tenant-scoped
+// writes, the other guards global writes. Use on any PUT/POST/DELETE handler
+// touching builtin_tools, disk config, package management, or similar global
+// state. Shares the predicate with WS layer via store.IsMasterScope so rules
+// cannot drift between transports.
+//
+// Returns true on allow, false on deny (in which case a 403 response has
+// already been written). Emits security.tenant_scope_violation slog on deny.
+func requireMasterScope(w http.ResponseWriter, r *http.Request) bool {
+	ctx := r.Context()
+	if store.IsMasterScope(ctx) {
+		return true
+	}
+	slog.Warn("security.tenant_scope_violation",
+		"path", r.URL.Path,
+		"method", r.Method,
+		"tenant_id", store.TenantIDFromContext(ctx),
+		"user_id", store.UserIDFromContext(ctx),
+	)
+	locale := store.LocaleFromContext(ctx)
+	writeJSON(w, http.StatusForbidden, map[string]string{
+		"error": i18n.T(locale, i18n.MsgMasterScopeRequired),
+	})
+	return false
+}
diff --git a/internal/http/tenant_scope_hotfix_test.go b/internal/http/tenant_scope_hotfix_test.go
new file mode 100644
index 00000000..b90c201a
--- /dev/null
+++ b/internal/http/tenant_scope_hotfix_test.go
@@ -0,0 +1,345 @@
+package http
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"github.com/google/uuid"
+
+	"github.com/nextlevelbuilder/goclaw/internal/store"
+)
+
+// Phase 0b hotfix coverage:
+//   - requireMasterScope unit tests (predicate surface)
+//   - builtin_tools handleUpdate: CRITICAL-1 regression guard
+//   - packages handleInstall / handleUninstall: CRITICAL-2 regression guard
+//   - api_keys handleRevoke: HIGH finding regression guard
+//
+// All tests use focused harnesses that avoid DB / real installers.
+
+// ---- helpers ----
+
+func newMasterScopeReq(method, path string, tid uuid.UUID, role string) *http.Request {
+	r := httptest.NewRequest(method, path, strings.NewReader(""))
+	ctx := r.Context()
+	if tid != uuid.Nil {
+		ctx = store.WithTenantID(ctx, tid)
+	}
+	if role != "" {
+		ctx = store.WithRole(ctx, role)
+	}
+	return r.WithContext(ctx)
+}
+
+// ---- requireMasterScope predicate tests ----
+
+func TestRequireMasterScope_SystemOwner_Allows(t *testing.T) {
+	// Owner role on arbitrary tenant must pass.
+	r := newMasterScopeReq(http.MethodPut, "/test", uuid.New(), store.RoleOwner)
+	w := httptest.NewRecorder()
+	if !requireMasterScope(w, r) {
+		t.Fatalf("system owner must be allowed, got %d: %s", w.Code, w.Body.String())
+	}
+}
+
+func TestRequireMasterScope_MasterTenant_Allows(t *testing.T) {
+	r := newMasterScopeReq(http.MethodPut, "/test", store.MasterTenantID, "admin")
+	w := httptest.NewRecorder()
+	if !requireMasterScope(w, r) {
+		t.Fatalf("master tenant ctx must be allowed, got %d: %s", w.Code, w.Body.String())
+	}
+}
+
+func TestRequireMasterScope_NilTenant_Allows(t *testing.T) {
+	// Legacy / system callers without any tenant ctx.
+	r := newMasterScopeReq(http.MethodPut, "/test", uuid.Nil, "")
+	w := httptest.NewRecorder()
+	if !requireMasterScope(w, r) {
+		t.Fatalf("nil tenant ctx must be allowed (master-scope fallback), got %d", w.Code)
+	}
+}
+
+func TestRequireMasterScope_NonMasterAdmin_Rejects(t *testing.T) {
+	// The bug-fix path: non-master tenant admin must be rejected.
+	tid := uuid.MustParse("aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa")
+	r := newMasterScopeReq(http.MethodPut, "/test", tid, "admin")
+	w := httptest.NewRecorder()
+	if requireMasterScope(w, r) {
+		t.Fatalf("non-master admin ctx must NOT be allowed")
+	}
+	if w.Code != http.StatusForbidden {
+		t.Fatalf("expected 403, got %d", w.Code)
+	}
+	if !strings.Contains(w.Body.String(), "master") {
+		t.Errorf("expected error message to mention master scope, got: %s", w.Body.String())
+	}
+}
+
+// ---- CRITICAL-1: builtin_tools handleUpdate regression ----
+
+// TestBuiltinToolsUpdate_RejectsNonMasterAdmin verifies that Phase 0b guard
+// blocks the exact attack vector described in the audit: a tenant admin
+// (RoleAdmin in a non-master tenant) attempting PUT /v1/tools/builtin/{name}
+// receives 403 without any store mutation.
+func TestBuiltinToolsUpdate_RejectsNonMasterAdmin(t *testing.T) {
+	h := &BuiltinToolsHandler{} // store nil — must never be reached
+	mux := http.NewServeMux()
+	mux.HandleFunc("PUT /v1/tools/builtin/{name}", h.handleUpdate)
+
+	tid := uuid.MustParse("bbbbbbbb-bbbb-bbbb-bbbb-bbbbbbbbbbbb")
+	req := httptest.NewRequest(http.MethodPut, "/v1/tools/builtin/web_search",
+		strings.NewReader(`{"enabled":true}`))
+	req.Header.Set("Content-Type", "application/json")
+	ctx := store.WithTenantID(req.Context(), tid)
+	ctx = store.WithRole(ctx, "admin")
+	req = req.WithContext(ctx)
+
+	rec := httptest.NewRecorder()
+	// If the guard fails open, h.store.Update is called on a nil store and
+	// the test panics — explicit recover catches that regression distinctly.
+	defer func() {
+		if r := recover(); r != nil {
+			t.Fatalf("guard did not short-circuit — handler panicked on nil store: %v", r)
+		}
+	}()
+	mux.ServeHTTP(rec, req)
+
+	if rec.Code != http.StatusForbidden {
+		t.Fatalf("expected 403 for non-master admin, got %d: %s", rec.Code, rec.Body.String())
+	}
+}
+
+// ---- CRITICAL-2: packages handleInstall / handleUninstall regression ----
+
+func TestPackagesInstall_RejectsNonMasterAdmin(t *testing.T) {
+	h := NewPackagesHandler()
+	mux := http.NewServeMux()
+	mux.HandleFunc("POST /v1/packages/install", h.handleInstall)
+
+	tid := uuid.MustParse("cccccccc-cccc-cccc-cccc-cccccccccccc")
+	req := httptest.NewRequest(http.MethodPost, "/v1/packages/install",
+		strings.NewReader(`{"package":"pip:malicious-pkg"}`))
+	req.Header.Set("Content-Type", "application/json")
+	ctx := store.WithTenantID(req.Context(), tid)
+	ctx = store.WithRole(ctx, "admin")
+	req = req.WithContext(ctx)
+
+	rec := httptest.NewRecorder()
+	mux.ServeHTTP(rec, req)
+
+	if rec.Code != http.StatusForbidden {
+		t.Fatalf("expected 403 for non-master admin, got %d: %s", rec.Code, rec.Body.String())
+	}
+}
+
+func TestPackagesUninstall_RejectsNonMasterAdmin(t *testing.T) {
+	h := NewPackagesHandler()
+	mux := http.NewServeMux()
+	mux.HandleFunc("POST /v1/packages/uninstall", h.handleUninstall)
+
+	tid := uuid.MustParse("dddddddd-dddd-dddd-dddd-dddddddddddd")
+	req := httptest.NewRequest(http.MethodPost, "/v1/packages/uninstall",
+		strings.NewReader(`{"package":"pip:pandas"}`))
+	req.Header.Set("Content-Type", "application/json")
+	ctx := store.WithTenantID(req.Context(), tid)
+	ctx = store.WithRole(ctx, "admin")
+	req = req.WithContext(ctx)
+
+	rec := httptest.NewRecorder()
+	mux.ServeHTTP(rec, req)
+
+	if rec.Code != http.StatusForbidden {
+		t.Fatalf("expected 403 for non-master admin, got %d: %s", rec.Code, rec.Body.String())
+	}
+}
+
+// ---- HIGH: api_keys handleRevoke ownership regression ----
+
+// TestAPIKeyRevoke_RejectsCrossTenant exercises the post-fix ownership check
+// in the HTTP handler. A tenant admin (non-owner) attempting to revoke a
+// key owned by a different tenant must receive 403, and the store-layer
+// Revoke must never be called — mockAPIKeyStore flags when it is.
+func TestAPIKeyRevoke_RejectsCrossTenant(t *testing.T) {
+	ms := newMockAPIKeyStore()
+	callerTID := uuid.MustParse("eeeeeeee-eeee-eeee-eeee-eeeeeeeeeeee")
+	keyOwnerTID := uuid.MustParse("ffffffff-ffff-ffff-ffff-ffffffffffff")
+	keyID := uuid.New()
+	ms.byID[keyID] = &store.APIKeyData{
+		ID:       keyID,
+		Name:     "other-tenant-key",
+		TenantID: keyOwnerTID,
+	}
+
+	h := &APIKeysHandler{apiKeys: ms}
+	mux := http.NewServeMux()
+	mux.HandleFunc("POST /v1/api-keys/{id}/revoke", h.handleRevoke)
+
+	req := httptest.NewRequest(http.MethodPost, "/v1/api-keys/"+keyID.String()+"/revoke", nil)
+	ctx := store.WithTenantID(req.Context(), callerTID)
+	ctx = store.WithRole(ctx, "admin")
+	req = req.WithContext(ctx)
+
+	rec := httptest.NewRecorder()
+	mux.ServeHTTP(rec, req)
+
+	if rec.Code != http.StatusForbidden {
+		t.Fatalf("expected 403 for cross-tenant revoke, got %d: %s", rec.Code, rec.Body.String())
+	}
+}
+
+// TestAPIKeyRevoke_RejectsSystemKeyForTenantAdmin verifies the NULL-tenant
+// (system-level) key cannot be revoked by a tenant admin — the core HIGH
+// vulnerability from the audit (store SQL `OR tenant_id IS NULL` arm).
+func TestAPIKeyRevoke_RejectsSystemKeyForTenantAdmin(t *testing.T) {
+	ms := newMockAPIKeyStore()
+	callerTID := uuid.MustParse("11111111-1111-1111-1111-111111111111")
+	keyID := uuid.New()
+	// Key with TenantID == uuid.Nil represents a NULL-tenant system key.
+	ms.byID[keyID] = &store.APIKeyData{
+		ID:       keyID,
+		Name:     "system-ci-key",
+		TenantID: uuid.Nil,
+	}
+
+	h := &APIKeysHandler{apiKeys: ms}
+	mux := http.NewServeMux()
+	mux.HandleFunc("POST /v1/api-keys/{id}/revoke", h.handleRevoke)
+
+	req := httptest.NewRequest(http.MethodPost, "/v1/api-keys/"+keyID.String()+"/revoke", nil)
+	ctx := store.WithTenantID(req.Context(), callerTID)
+	ctx = store.WithRole(ctx, "admin")
+	req = req.WithContext(ctx)
+
+	rec := httptest.NewRecorder()
+	mux.ServeHTTP(rec, req)
+
+	if rec.Code != http.StatusForbidden {
+		t.Fatalf("expected 403 for tenant admin revoking system key, got %d: %s", rec.Code, rec.Body.String())
+	}
+}
+
+// TestAPIKeyRevoke_AllowsOwnTenantKey happy path — tenant admin revoking a
+// key owned by their own tenant must succeed (no regression).
+func TestAPIKeyRevoke_AllowsOwnTenantKey(t *testing.T) {
+	ms := newMockAPIKeyStore()
+	tid := uuid.MustParse("22222222-2222-2222-2222-222222222222")
+	keyID := uuid.New()
+	ms.byID[keyID] = &store.APIKeyData{
+		ID:       keyID,
+		Name:     "own-tenant-key",
+		TenantID: tid,
+	}
+
+	h := &APIKeysHandler{apiKeys: ms}
+	mux := http.NewServeMux()
+	mux.HandleFunc("POST /v1/api-keys/{id}/revoke", h.handleRevoke)
+
+	req := httptest.NewRequest(http.MethodPost, "/v1/api-keys/"+keyID.String()+"/revoke", nil)
+	ctx := store.WithTenantID(req.Context(), tid)
+	ctx = store.WithRole(ctx, "admin")
+	req = req.WithContext(ctx)
+
+	rec := httptest.NewRecorder()
+	mux.ServeHTTP(rec, req)
+
+	if rec.Code != http.StatusOK {
+		t.Fatalf("expected 200 for same-tenant revoke, got %d: %s", rec.Code, rec.Body.String())
+	}
+}
+
+// TestAPIKeyRevoke_AllowsSystemOwnerOnSystemKey happy path — system owner
+// can revoke NULL-tenant system keys (CI/CD rotation).
+func TestAPIKeyRevoke_AllowsSystemOwnerOnSystemKey(t *testing.T) {
+	ms := newMockAPIKeyStore()
+	keyID := uuid.New()
+	ms.byID[keyID] = &store.APIKeyData{
+		ID:       keyID,
+		Name:     "system-ci-key",
+		TenantID: uuid.Nil,
+	}
+
+	h := &APIKeysHandler{apiKeys: ms}
+	mux := http.NewServeMux()
+	mux.HandleFunc("POST /v1/api-keys/{id}/revoke", h.handleRevoke)
+
+	req := httptest.NewRequest(http.MethodPost, "/v1/api-keys/"+keyID.String()+"/revoke", nil)
+	ctx := store.WithRole(req.Context(), store.RoleOwner)
+	req = req.WithContext(ctx)
+
+	rec := httptest.NewRecorder()
+	mux.ServeHTTP(rec, req)
+
+	if rec.Code != http.StatusOK {
+		t.Fatalf("expected 200 for system owner revoking system key, got %d: %s", rec.Code, rec.Body.String())
+	}
+}
+
+// --- master-scope happy paths on guarded handlers ---
+
+// recordingBuiltinToolStore is a minimal BuiltinToolStore stub that records
+// calls to Update so the happy-path test can assert "the guard allowed the
+// request through to the store" without relying on panic-recover semantics.
+// Only Update is exercised; the rest return zero values to satisfy the
+// interface contract.
+type recordingBuiltinToolStore struct {
+	updateName string
+	updateBody map[string]any
+}
+
+func (s *recordingBuiltinToolStore) Update(_ context.Context, name string, updates map[string]any) error {
+	s.updateName = name
+	s.updateBody = updates
+	return nil
+}
+func (s *recordingBuiltinToolStore) List(_ context.Context) ([]store.BuiltinToolDef, error) {
+	return nil, nil
+}
+func (s *recordingBuiltinToolStore) Get(_ context.Context, _ string) (*store.BuiltinToolDef, error) {
+	return nil, nil
+}
+func (s *recordingBuiltinToolStore) Seed(_ context.Context, _ []store.BuiltinToolDef) error {
+	return nil
+}
+func (s *recordingBuiltinToolStore) ListEnabled(_ context.Context) ([]store.BuiltinToolDef, error) {
+	return nil, nil
+}
+func (s *recordingBuiltinToolStore) GetSettings(_ context.Context, _ string) (json.RawMessage, error) {
+	return nil, nil
+}
+
+// TestBuiltinToolsUpdate_AllowsMasterAdmin ensures master-scope callers are
+// not blocked by Phase 0b. Uses a recording stub store so we can assert the
+// guard passed and the handler reached Update — no fragile panic-recover.
+func TestBuiltinToolsUpdate_AllowsMasterAdmin(t *testing.T) {
+	rec := &recordingBuiltinToolStore{}
+	h := &BuiltinToolsHandler{store: rec}
+	mux := http.NewServeMux()
+	mux.HandleFunc("PUT /v1/tools/builtin/{name}", h.handleUpdate)
+
+	req := httptest.NewRequest(http.MethodPut, "/v1/tools/builtin/web_search",
+		strings.NewReader(`{"enabled":true}`))
+	req.Header.Set("Content-Type", "application/json")
+	ctx := store.WithTenantID(req.Context(), store.MasterTenantID)
+	ctx = store.WithRole(ctx, "admin")
+	req = req.WithContext(ctx)
+
+	rr := httptest.NewRecorder()
+	mux.ServeHTTP(rr, req)
+
+	if rr.Code != http.StatusOK {
+		t.Fatalf("expected 200 for master admin, got %d: %s", rr.Code, rr.Body.String())
+	}
+	if rec.updateName != "web_search" {
+		t.Errorf("expected Update called with name=web_search, got %q", rec.updateName)
+	}
+	if enabled, ok := rec.updateBody["enabled"].(bool); !ok || !enabled {
+		t.Errorf("expected Update body {enabled:true}, got %+v", rec.updateBody)
+	}
+}
+
+// sanity: make sure json is importable (unused import guard during refactors)
+var _ = json.Marshal
diff --git a/internal/i18n/catalog_en.go b/internal/i18n/catalog_en.go
index fd6e33c4..df79637f 100644
--- a/internal/i18n/catalog_en.go
+++ b/internal/i18n/catalog_en.go
@@ -108,6 +108,7 @@ func init() {
 		MsgRawConfigRequired:     "raw config is required",
 		MsgRawPatchRequired:      "raw patch is required",
 		MsgConfigMasterScopeOnly: "config.* methods are master-scope only; use tenant tool config endpoints for per-tenant overrides",
+		MsgMasterScopeRequired:   "this action requires master tenant scope",
 
 		// Storage / File
 		MsgCannotDeleteSkillsDir: "cannot delete skills directories",
diff --git a/internal/i18n/catalog_vi.go b/internal/i18n/catalog_vi.go
index 1f2227b0..39cebfab 100644
--- a/internal/i18n/catalog_vi.go
+++ b/internal/i18n/catalog_vi.go
@@ -108,6 +108,7 @@ func init() {
 		MsgRawConfigRequired:     "cấu hình raw là bắt buộc",
 		MsgRawPatchRequired:      "patch raw là bắt buộc",
 		MsgConfigMasterScopeOnly: "config.* chỉ áp dụng cho master scope; dùng endpoint tenant tool config cho override theo tenant",
+		MsgMasterScopeRequired:   "thao tác này yêu cầu phạm vi tenant chính",
 
 		// Storage / File
 		MsgCannotDeleteSkillsDir: "không thể xóa thư mục skill",
diff --git a/internal/i18n/catalog_zh.go b/internal/i18n/catalog_zh.go
index 61ddfa7d..627809c9 100644
--- a/internal/i18n/catalog_zh.go
+++ b/internal/i18n/catalog_zh.go
@@ -108,6 +108,7 @@ func init() {
 		MsgRawConfigRequired:     "raw 配置是必填项",
 		MsgRawPatchRequired:      "raw 补丁是必填项",
 		MsgConfigMasterScopeOnly: "config.* 方法仅适用于主作用域；使用租户工具配置端点进行租户级覆盖",
+		MsgMasterScopeRequired:   "此操作需要主租户范围",
 
 		// Storage / File
 		MsgCannotDeleteSkillsDir: "无法删除Skill目录",
diff --git a/internal/i18n/keys.go b/internal/i18n/keys.go
index a84bd22d..a7890574 100644
--- a/internal/i18n/keys.go
+++ b/internal/i18n/keys.go
@@ -109,6 +109,7 @@ const (
 	MsgRawConfigRequired      = "error.raw_config_required"       // "raw config is required"
 	MsgRawPatchRequired       = "error.raw_patch_required"        // "raw patch is required"
 	MsgConfigMasterScopeOnly  = "error.config_master_scope_only"  // "config.* methods are master-scope only"
+	MsgMasterScopeRequired    = "error.master_scope_required"     // "this action requires master tenant scope"
 
 	// --- Storage / File ---
 	MsgCannotDeleteSkillsDir = "error.cannot_delete_skills_dir" // "cannot delete skills directories"
diff --git a/internal/store/api_key_store.go b/internal/store/api_key_store.go
index 039b3b0a..441f4022 100644
--- a/internal/store/api_key_store.go
+++ b/internal/store/api_key_store.go
@@ -29,6 +29,13 @@ type APIKeyStore interface {
 	// Create inserts a new API key.
 	Create(ctx context.Context, key *APIKeyData) error
 
+	// Get looks up an API key by its ID. Unlike GetByHash, this does NOT
+	// filter on revoked/expired state — used by admin handlers that need to
+	// verify ownership before revoke/delete. Returns sql.ErrNoRows when the
+	// key does not exist. No tenant scoping is applied at store level —
+	// callers must enforce their own ownership rules.
+	Get(ctx context.Context, id uuid.UUID) (*APIKeyData, error)
+
 	// GetByHash looks up an active (non-revoked, non-expired) key by its SHA-256 hash.
 	GetByHash(ctx context.Context, keyHash string) (*APIKeyData, error)
 
@@ -38,9 +45,6 @@ type APIKeyStore interface {
 	// Revoke marks a key as revoked. If ownerID is non-empty, also enforces owner_id = ownerID.
 	Revoke(ctx context.Context, id uuid.UUID, ownerID string) error
 
-	// Delete permanently removes a key. If ownerID is non-empty, also enforces owner_id = ownerID.
-	Delete(ctx context.Context, id uuid.UUID, ownerID string) error
-
 	// TouchLastUsed updates the last_used_at timestamp.
 	TouchLastUsed(ctx context.Context, id uuid.UUID) error
 }
diff --git a/internal/store/context.go b/internal/store/context.go
index 633ce8c9..94122f58 100644
--- a/internal/store/context.go
+++ b/internal/store/context.go
@@ -287,6 +287,24 @@ func IsOwnerRole(ctx context.Context) bool {
 	return RoleFromContext(ctx) == string(RoleOwner)
 }
 
+// IsMasterScope reports whether ctx should be treated as master-scope:
+//
+//	(a) system owner role (IsOwnerRole bypass-all), or
+//	(b) tenant id is unset (uuid.Nil — legacy / system callers), or
+//	(c) tenant id equals MasterTenantID.
+//
+// Used by both WS config.* methods and HTTP admin routes that write to
+// global (non-tenant-scoped) tables or execute server-wide side effects
+// (shell, filesystem). Centralises the Phase 1 / Phase 0b hotfix rule
+// so every layer shares one predicate — no drift.
+func IsMasterScope(ctx context.Context) bool {
+	if IsOwnerRole(ctx) {
+		return true
+	}
+	tid := TenantIDFromContext(ctx)
+	return tid == uuid.Nil || tid == MasterTenantID
+}
+
 // RoleOwner is the owner role constant for context checks.
 // Must match permissions.RoleOwner.
 const RoleOwner = "owner"
diff --git a/internal/store/pg/api_keys.go b/internal/store/pg/api_keys.go
index d6248d5f..b626bfef 100644
--- a/internal/store/pg/api_keys.go
+++ b/internal/store/pg/api_keys.go
@@ -41,6 +41,40 @@ func (s *PGAPIKeyStore) Create(ctx context.Context, key *store.APIKeyData) error
 	return err
 }
 
+// Get fetches a key by ID without revoked/expired filtering. No tenant scoping
+// at store layer — callers must enforce their own ownership rules.
+func (s *PGAPIKeyStore) Get(ctx context.Context, id uuid.UUID) (*store.APIKeyData, error) {
+	row := s.db.QueryRowContext(ctx,
+		`SELECT id, name, prefix, key_hash, scopes, owner_id, tenant_id, expires_at, last_used_at, revoked, created_by, created_at, updated_at
+		 FROM api_keys
+		 WHERE id = $1`,
+		id,
+	)
+
+	var k store.APIKeyData
+	var createdBy *string
+	var ownerID *string
+	var tenantID *uuid.UUID
+	err := row.Scan(
+		&k.ID, &k.Name, &k.Prefix, &k.KeyHash, pq.Array(&k.Scopes),
+		&ownerID, &tenantID, &k.ExpiresAt, &k.LastUsedAt, &k.Revoked, &createdBy,
+		&k.CreatedAt, &k.UpdatedAt,
+	)
+	if err != nil {
+		return nil, err
+	}
+	if createdBy != nil {
+		k.CreatedBy = *createdBy
+	}
+	if ownerID != nil {
+		k.OwnerID = *ownerID
+	}
+	if tenantID != nil {
+		k.TenantID = *tenantID
+	}
+	return &k, nil
+}
+
 func (s *PGAPIKeyStore) GetByHash(ctx context.Context, keyHash string) (*store.APIKeyData, error) {
 	row := s.db.QueryRowContext(ctx,
 		`SELECT id, name, prefix, key_hash, scopes, owner_id, tenant_id, expires_at, last_used_at, revoked, created_by, created_at, updated_at
@@ -167,35 +201,6 @@ func (s *PGAPIKeyStore) Revoke(ctx context.Context, id uuid.UUID, ownerID string
 	return nil
 }
 
-func (s *PGAPIKeyStore) Delete(ctx context.Context, id uuid.UUID, ownerID string) error {
-	q := "DELETE FROM api_keys WHERE id = $1"
-	args := []any{id}
-	argIdx := 2
-
-	if ownerID != "" {
-		q += fmt.Sprintf(" AND owner_id = $%d", argIdx)
-		args = append(args, ownerID)
-		argIdx++
-	}
-	if !store.IsCrossTenant(ctx) {
-		tid := store.TenantIDFromContext(ctx)
-		if tid != uuid.Nil {
-			q += fmt.Sprintf(" AND (tenant_id = $%d OR tenant_id IS NULL)", argIdx)
-			args = append(args, tid)
-		}
-	}
-
-	res, err := s.db.ExecContext(ctx, q, args...)
-	if err != nil {
-		return err
-	}
-	n, _ := res.RowsAffected()
-	if n == 0 {
-		return sql.ErrNoRows
-	}
-	return nil
-}
-
 func (s *PGAPIKeyStore) TouchLastUsed(ctx context.Context, id uuid.UUID) error {
 	_, err := s.db.ExecContext(ctx,
 		`UPDATE api_keys SET last_used_at = $2 WHERE id = $1`,
diff --git a/internal/store/sqlitestore/api_keys.go b/internal/store/sqlitestore/api_keys.go
index 11aeeafc..4b219538 100644
--- a/internal/store/sqlitestore/api_keys.go
+++ b/internal/store/sqlitestore/api_keys.go
@@ -41,6 +41,52 @@ func (s *SQLiteAPIKeyStore) Create(ctx context.Context, key *store.APIKeyData) e
 	return err
 }
 
+// Get fetches a key by ID without revoked/expired filtering. No tenant scoping
+// at store layer — callers must enforce their own ownership rules.
+func (s *SQLiteAPIKeyStore) Get(ctx context.Context, id uuid.UUID) (*store.APIKeyData, error) {
+	row := s.db.QueryRowContext(ctx,
+		`SELECT id, name, prefix, key_hash, scopes, owner_id, tenant_id, expires_at, last_used_at, revoked, created_by, created_at, updated_at
+		 FROM api_keys
+		 WHERE id = ?`,
+		id,
+	)
+
+	var k store.APIKeyData
+	var createdBy *string
+	var ownerID *string
+	var tenantID *uuid.UUID
+	var scopesRaw []byte
+	var expiresAt, lastUsedAt nullSqliteTime
+	createdAt, updatedAt := scanTimePair()
+	err := row.Scan(
+		&k.ID, &k.Name, &k.Prefix, &k.KeyHash, &scopesRaw,
+		&ownerID, &tenantID, &expiresAt, &lastUsedAt, &k.Revoked, &createdBy,
+		createdAt, updatedAt,
+	)
+	if err != nil {
+		return nil, err
+	}
+	k.CreatedAt = createdAt.Time
+	k.UpdatedAt = updatedAt.Time
+	if expiresAt.Valid {
+		k.ExpiresAt = &expiresAt.Time
+	}
+	if lastUsedAt.Valid {
+		k.LastUsedAt = &lastUsedAt.Time
+	}
+	scanJSONStringArray(scopesRaw, &k.Scopes)
+	if createdBy != nil {
+		k.CreatedBy = *createdBy
+	}
+	if ownerID != nil {
+		k.OwnerID = *ownerID
+	}
+	if tenantID != nil {
+		k.TenantID = *tenantID
+	}
+	return &k, nil
+}
+
 func (s *SQLiteAPIKeyStore) GetByHash(ctx context.Context, keyHash string) (*store.APIKeyData, error) {
 	row := s.db.QueryRowContext(ctx,
 		`SELECT id, name, prefix, key_hash, scopes, owner_id, tenant_id, expires_at, last_used_at, revoked, created_by, created_at, updated_at
@@ -185,33 +231,6 @@ func (s *SQLiteAPIKeyStore) Revoke(ctx context.Context, id uuid.UUID, ownerID st
 	return nil
 }
 
-func (s *SQLiteAPIKeyStore) Delete(ctx context.Context, id uuid.UUID, ownerID string) error {
-	q := "DELETE FROM api_keys WHERE id = ?"
-	args := []any{id}
-
-	if ownerID != "" {
-		q += " AND owner_id = ?"
-		args = append(args, ownerID)
-	}
-	if !store.IsCrossTenant(ctx) {
-		tid := store.TenantIDFromContext(ctx)
-		if tid != uuid.Nil {
-			q += " AND (tenant_id = ? OR tenant_id IS NULL)"
-			args = append(args, tid)
-		}
-	}
-
-	res, err := s.db.ExecContext(ctx, q, args...)
-	if err != nil {
-		return err
-	}
-	n, _ := res.RowsAffected()
-	if n == 0 {
-		return sql.ErrNoRows
-	}
-	return nil
-}
-
 func (s *SQLiteAPIKeyStore) TouchLastUsed(ctx context.Context, id uuid.UUID) error {
 	_, err := s.db.ExecContext(ctx,
 		`UPDATE api_keys SET last_used_at = ? WHERE id = ?`,