diff --git a/apps/backend/internal/backendapp/services.go b/apps/backend/internal/backendapp/services.go
index 88ad98e1f0..074966639a 100644
--- a/apps/backend/internal/backendapp/services.go
+++ b/apps/backend/internal/backendapp/services.go
@@ -615,6 +615,7 @@ func initWorkflowSyncService(dbPool *db.Pool, githubSvc *github.Service, workflo
 		log.Warn("workflow sync service initialization failed (non-fatal)", zap.Error(err))
 		return nil
 	}
+	svc.SetWorkspaceAuthorizer(taskSvc.AuthorizeWorkspaceAccess)
 	return svc
 }
 
diff --git a/apps/backend/internal/backendapp/workflowsync_wiring_test.go b/apps/backend/internal/backendapp/workflowsync_wiring_test.go
new file mode 100644
index 0000000000..c0d8aa9faa
--- /dev/null
+++ b/apps/backend/internal/backendapp/workflowsync_wiring_test.go
@@ -0,0 +1,85 @@
+package backendapp
+
+import (
+	"context"
+	"errors"
+	"path/filepath"
+	"testing"
+
+	"github.com/jmoiron/sqlx"
+
+	"github.com/kandev/kandev/internal/auth/authn"
+	"github.com/kandev/kandev/internal/common/logger"
+	"github.com/kandev/kandev/internal/db"
+	"github.com/kandev/kandev/internal/github"
+	"github.com/kandev/kandev/internal/task/repository/repoerrors"
+	taskservice "github.com/kandev/kandev/internal/task/service"
+)
+
+// TestInitWorkflowSyncService_WiresRealWorkspaceAuthorization calls the real
+// initWorkflowSyncService boot function — not a hand-copied re-wiring — with a
+// real taskservice.Service backed by SQLite, so a regression that removes or
+// breaks the SetWorkspaceAuthorizer(taskSvc.AuthorizeWorkspaceAccess) line
+// inside it fails this test. The workflowsync package's own tests only ever
+// install a hand-written fake authorizer and cannot detect that class of
+// regression.
+func TestInitWorkflowSyncService_WiresRealWorkspaceAuthorization(t *testing.T) {
+	harness := newBootStateTestHarness(t)
+	ctx := context.Background()
+
+	ownerCtx := authn.WithIdentity(ctx, authn.Identity{UserID: "owner-1", Role: authn.RoleMember})
+	workspace, err := harness.taskSvc.CreateWorkspace(ownerCtx, &taskservice.CreateWorkspaceRequest{
+		Name: "victim workspace",
+	})
+	if err != nil {
+		t.Fatalf("create workspace: %v", err)
+	}
+	if workspace.OwnerID != "owner-1" {
+		t.Fatalf("workspace owner = %q, want owner-1 (authenticated caller owns what it creates)", workspace.OwnerID)
+	}
+
+	dbConn, err := db.OpenSQLite(filepath.Join(t.TempDir(), "workflowsync.db"))
+	if err != nil {
+		t.Fatalf("OpenSQLite: %v", err)
+	}
+	sqlxDB := sqlx.NewDb(dbConn, "sqlite3")
+	t.Cleanup(func() {
+		if err := sqlxDB.Close(); err != nil {
+			t.Errorf("close db: %v", err)
+		}
+	})
+	log, err := logger.NewLogger(logger.LoggingConfig{Level: "error", Format: "console"})
+	if err != nil {
+		t.Fatalf("logger: %v", err)
+	}
+
+	// A non-nil GitHub service is required for initWorkflowSyncService to
+	// wire anything at all (see its early "GitHub unavailable" return); the
+	// client itself is never exercised by this test.
+	githubSvc := github.NewService(nil, github.AuthMethodNone, nil, nil, nil, log)
+
+	svc := initWorkflowSyncService(db.NewPool(sqlxDB, sqlxDB), githubSvc, harness.workflowSvc, harness.taskSvc, log)
+	if svc == nil {
+		t.Fatal("initWorkflowSyncService returned nil")
+	}
+
+	if _, err := svc.GetConfigForWorkspace(ownerCtx, workspace.ID); err != nil {
+		t.Fatalf("owner GetConfigForWorkspace: %v", err)
+	}
+
+	foreignCtx := authn.WithIdentity(ctx, authn.Identity{UserID: "attacker-1", Role: authn.RoleMember})
+	_, err = svc.GetConfigForWorkspace(foreignCtx, workspace.ID)
+	if !errors.Is(err, repoerrors.ErrWorkspaceNotFound) {
+		t.Fatalf("foreign identity GetConfigForWorkspace err = %v, want ErrWorkspaceNotFound", err)
+	}
+
+	// Internal caller (no identity in context — matches the periodic poller)
+	// and the pre-auth synthetic identity are both unscoped.
+	if _, err := svc.GetConfigForWorkspace(ctx, workspace.ID); err != nil {
+		t.Fatalf("identity-free GetConfigForWorkspace: %v", err)
+	}
+	syntheticCtx := authn.WithIdentity(ctx, authn.Identity{UserID: "single-user", Role: authn.RoleAdmin, Synthetic: true})
+	if _, err := svc.GetConfigForWorkspace(syntheticCtx, workspace.ID); err != nil {
+		t.Fatalf("synthetic identity GetConfigForWorkspace: %v", err)
+	}
+}
diff --git a/apps/backend/internal/workflowsync/handlers.go b/apps/backend/internal/workflowsync/handlers.go
index a7b69b177d..e9ec6c0de9 100644
--- a/apps/backend/internal/workflowsync/handlers.go
+++ b/apps/backend/internal/workflowsync/handlers.go
@@ -9,8 +9,18 @@ import (
 	"go.uber.org/zap"
 
 	"github.com/kandev/kandev/internal/common/logger"
+	"github.com/kandev/kandev/internal/task/repository/repoerrors"
 )
 
+// workspaceDenied reports whether err is the per-user workspace access
+// denial surfaced by the workspace authorizer. Handlers map it to 404 so a
+// workspace the caller may not access is indistinguishable from a missing
+// one — the same convention used by every other integration in this
+// codebase (see internal/jira/handlers.go).
+func workspaceDenied(err error) bool {
+	return errors.Is(err, repoerrors.ErrWorkspaceNotFound)
+}
+
 // Controller holds HTTP route handlers for workflow sync.
 type Controller struct {
 	service *Service
@@ -46,6 +56,10 @@ func (c *Controller) httpGetConfig(ctx *gin.Context) {
 		return
 	}
 	cfg, err := c.service.GetConfigForWorkspace(ctx.Request.Context(), workspaceID)
+	if workspaceDenied(err) {
+		ctx.JSON(http.StatusNotFound, gin.H{"error": "workspace not found"})
+		return
+	}
 	if err != nil {
 		c.internalError(ctx, "failed to load workflow sync config", err)
 		return
@@ -75,6 +89,10 @@ func (c *Controller) httpSetConfig(ctx *gin.Context) {
 		return
 	}
 	cfg, err := c.service.SetConfigForWorkspace(ctx.Request.Context(), workspaceID, &req)
+	if workspaceDenied(err) {
+		ctx.JSON(http.StatusNotFound, gin.H{"error": "workspace not found"})
+		return
+	}
 	if errors.Is(err, ErrInvalidConfig) {
 		ctx.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
 		return
@@ -91,7 +109,12 @@ func (c *Controller) httpDeleteConfig(ctx *gin.Context) {
 	if !ok {
 		return
 	}
-	if err := c.service.DeleteConfigForWorkspace(ctx.Request.Context(), workspaceID); err != nil {
+	err := c.service.DeleteConfigForWorkspace(ctx.Request.Context(), workspaceID)
+	if workspaceDenied(err) {
+		ctx.JSON(http.StatusNotFound, gin.H{"error": "workspace not found"})
+		return
+	}
+	if err != nil {
 		c.internalError(ctx, "failed to remove workflow sync config", err)
 		return
 	}
@@ -108,11 +131,19 @@ func (c *Controller) httpForceSync(ctx *gin.Context) {
 		return
 	}
 	result, syncErr := c.service.SyncWorkspace(ctx.Request.Context(), workspaceID)
+	if workspaceDenied(syncErr) {
+		ctx.JSON(http.StatusNotFound, gin.H{"error": "workspace not found"})
+		return
+	}
 	if errors.Is(syncErr, ErrNotConfigured) {
 		ctx.JSON(http.StatusNotFound, gin.H{"error": syncErr.Error()})
 		return
 	}
 	cfg, err := c.service.GetConfigForWorkspace(ctx.Request.Context(), workspaceID)
+	if workspaceDenied(err) {
+		ctx.JSON(http.StatusNotFound, gin.H{"error": "workspace not found"})
+		return
+	}
 	if err != nil {
 		c.internalError(ctx, "failed to load workflow sync config", err)
 		return
diff --git a/apps/backend/internal/workflowsync/handlers_test.go b/apps/backend/internal/workflowsync/handlers_test.go
new file mode 100644
index 0000000000..3c037c26ab
--- /dev/null
+++ b/apps/backend/internal/workflowsync/handlers_test.go
@@ -0,0 +1,210 @@
+package workflowsync
+
+import (
+	"bytes"
+	"context"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/gin-gonic/gin"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/kandev/kandev/internal/auth/authn"
+	"github.com/kandev/kandev/internal/common/logger"
+	"github.com/kandev/kandev/internal/task/repository/repoerrors"
+)
+
+const (
+	victimWorkspace = "ws-victim"
+	victimOwnerID   = "owner-1"
+	attackerID      = "attacker-1"
+	victimRepoOwner = "victim-org"
+	victimRepoName  = "victim-repo"
+	victimBranch    = "victim-branch"
+	victimPath      = "victim/path"
+)
+
+// ownerOnlyAuthorizer mirrors the real callerScope semantics documented in
+// apps/backend/AGENTS.md: no identity in context, or a synthetic identity
+// (auth disabled), is unscoped; a real identity may only reach the workspace
+// it owns.
+func ownerOnlyAuthorizer(ownerID, workspaceID string) func(context.Context, string) error {
+	return func(ctx context.Context, wsID string) error {
+		identity, ok := authn.IdentityFromContext(ctx)
+		if !ok || identity.Synthetic {
+			return nil
+		}
+		if wsID == workspaceID && identity.UserID == ownerID {
+			return nil
+		}
+		return repoerrors.ErrWorkspaceNotFound
+	}
+}
+
+func newTestRouter(t *testing.T, svc *Service) *gin.Engine {
+	t.Helper()
+	gin.SetMode(gin.TestMode)
+	router := gin.New()
+	log, err := logger.NewLogger(logger.LoggingConfig{Level: "error", Format: "console"})
+	require.NoError(t, err)
+	RegisterRoutes(router, svc, log)
+	return router
+}
+
+func withIdentity(req *http.Request, identity authn.Identity) *http.Request {
+	return req.WithContext(authn.WithIdentity(req.Context(), identity))
+}
+
+// configOp is one of the four workflow-sync HTTP entry points, parameterized
+// by workspace ID so every test in this file can drive all four uniformly.
+type configOp struct {
+	name   string
+	method string
+	path   func(workspaceID string) string
+	body   []byte
+}
+
+var allConfigOps = []configOp{
+	{
+		name: "get", method: http.MethodGet,
+		path: func(ws string) string { return "/api/v1/workflow-sync/config?workspace_id=" + ws },
+	},
+	{
+		name: "post", method: http.MethodPost,
+		path: func(ws string) string { return "/api/v1/workflow-sync/config?workspace_id=" + ws },
+		body: []byte(`{"repo_owner":"attacker","repo_name":"evil"}`),
+	},
+	{
+		name: "delete", method: http.MethodDelete,
+		path: func(ws string) string { return "/api/v1/workflow-sync/config?workspace_id=" + ws },
+	},
+	{
+		name: "sync", method: http.MethodPost,
+		path: func(ws string) string { return "/api/v1/workflow-sync/sync?workspace_id=" + ws },
+	},
+}
+
+func doOp(t *testing.T, router *gin.Engine, op configOp, workspaceID string, identity authn.Identity) *httptest.ResponseRecorder {
+	t.Helper()
+	var body *bytes.Reader
+	if op.body != nil {
+		body = bytes.NewReader(op.body)
+	} else {
+		body = bytes.NewReader(nil)
+	}
+	req := withIdentity(httptest.NewRequest(op.method, op.path(workspaceID), body), identity)
+	resp := httptest.NewRecorder()
+	router.ServeHTTP(resp, req)
+	return resp
+}
+
+// newOwnedWorkspace builds a fresh service + router with one configured
+// workspace and the given owner wired as the sole authorized identity. Each
+// op-level test gets its own instance so DELETE/POST attempts in one subtest
+// can't affect another's assertions.
+func newOwnedWorkspace(t *testing.T) (*gin.Engine, string) {
+	t.Helper()
+	svc, _ := setupTestService(t, seededMockClient())
+	configureWorkspace(t, svc, victimWorkspace)
+	svc.SetWorkspaceAuthorizer(ownerOnlyAuthorizer(victimOwnerID, victimWorkspace))
+	return newTestRouter(t, svc), victimWorkspace
+}
+
+func TestHTTPHandlers_OwnerSucceedsOnAllRoutes(t *testing.T) {
+	owner := authn.Identity{UserID: victimOwnerID, Role: authn.RoleMember}
+	for _, op := range allConfigOps {
+		t.Run(op.name, func(t *testing.T) {
+			router, ws := newOwnedWorkspace(t)
+			resp := doOp(t, router, op, ws, owner)
+			assert.Equal(t, http.StatusOK, resp.Code, "response body: %s", resp.Body.String())
+		})
+	}
+}
+
+func TestHTTPHandlers_SyntheticIdentitySucceedsOnAllRoutes(t *testing.T) {
+	synthetic := authn.Identity{UserID: "single-user", Role: authn.RoleAdmin, Synthetic: true}
+	for _, op := range allConfigOps {
+		t.Run(op.name, func(t *testing.T) {
+			router, ws := newOwnedWorkspace(t)
+			resp := doOp(t, router, op, ws, synthetic)
+			assert.Equal(t, http.StatusOK, resp.Code, "response body: %s", resp.Body.String())
+		})
+	}
+}
+
+func TestHTTPHandlers_ForeignMemberDeniedOnAllRoutesWithoutLeaking(t *testing.T) {
+	svc, applier := setupTestService(t, seededMockClient())
+	configureWorkspace(t, svc, victimWorkspace)
+	require.NoError(t, updateVictimRepo(t, svc))
+	before, err := svc.store.GetConfigForWorkspace(context.Background(), victimWorkspace)
+	require.NoError(t, err)
+	require.NotNil(t, before)
+
+	svc.SetWorkspaceAuthorizer(ownerOnlyAuthorizer(victimOwnerID, victimWorkspace))
+	router := newTestRouter(t, svc)
+	attacker := authn.Identity{UserID: attackerID, Role: authn.RoleMember}
+
+	for _, op := range allConfigOps {
+		t.Run(op.name, func(t *testing.T) {
+			resp := doOp(t, router, op, victimWorkspace, attacker)
+			assert.Equal(t, http.StatusNotFound, resp.Code, "response body: %s", resp.Body.String())
+			for _, secret := range []string{victimRepoOwner, victimRepoName, victimBranch, victimPath} {
+				assert.NotContains(t, resp.Body.String(), secret)
+			}
+		})
+	}
+
+	after, err := svc.store.GetConfigForWorkspace(context.Background(), victimWorkspace)
+	require.NoError(t, err)
+	require.NotNil(t, after)
+	assert.Equal(t, *before, *after, "denied requests must not change any field of the victim's config")
+	assert.Empty(t, applier.released, "denied delete must not release synced workflows")
+	assert.Zero(t, applier.callCount(), "denied sync must never reach the applier")
+}
+
+// TestHTTPHandlers_ForceSyncDeniesSecondLookupAfterAccessRevoked covers the
+// narrow race in httpForceSync: SyncWorkspace and the follow-up
+// GetConfigForWorkspace (used to build the response) are two separate
+// authorization checks. If access is revoked between them — say a workspace
+// is deleted, or reassigned, mid-request — the second call must still map to
+// a sanitized 404, not fall through to the generic 500 path.
+func TestHTTPHandlers_ForceSyncDeniesSecondLookupAfterAccessRevoked(t *testing.T) {
+	svc, _ := setupTestService(t, seededMockClient())
+	configureWorkspace(t, svc, victimWorkspace)
+
+	calls := 0
+	svc.SetWorkspaceAuthorizer(func(context.Context, string) error {
+		calls++
+		if calls == 1 {
+			return nil
+		}
+		return repoerrors.ErrWorkspaceNotFound
+	})
+	router := newTestRouter(t, svc)
+	owner := authn.Identity{UserID: victimOwnerID, Role: authn.RoleMember}
+
+	req := withIdentity(httptest.NewRequest(http.MethodPost, "/api/v1/workflow-sync/sync?workspace_id="+victimWorkspace, nil), owner)
+	resp := httptest.NewRecorder()
+	router.ServeHTTP(resp, req)
+
+	assert.Equal(t, http.StatusNotFound, resp.Code, "response body: %s", resp.Body.String())
+	assert.NotContains(t, resp.Body.String(), "acme")
+	assert.GreaterOrEqual(t, calls, 2, "test requires both the sync and the follow-up config lookup to run")
+}
+
+// updateVictimRepo overwrites the seeded config with distinctive identity
+// (repo, branch, and path) so leak assertions aren't relying on the shared
+// default fixture values used elsewhere in this package's tests.
+func updateVictimRepo(t *testing.T, svc *Service) error {
+	t.Helper()
+	_, err := svc.store.UpsertConfigForWorkspace(context.Background(), victimWorkspace, &SetConfigRequest{
+		RepoOwner:       victimRepoOwner,
+		RepoName:        victimRepoName,
+		Branch:          victimBranch,
+		Path:            victimPath,
+		IntervalSeconds: DefaultIntervalSeconds,
+	})
+	return err
+}
diff --git a/apps/backend/internal/workflowsync/service.go b/apps/backend/internal/workflowsync/service.go
index ce286318ee..7cab8cc868 100644
--- a/apps/backend/internal/workflowsync/service.go
+++ b/apps/backend/internal/workflowsync/service.go
@@ -51,6 +51,27 @@ type Service struct {
 	// delete for that workspace waits (bounded by the HTTP client timeout)
 	// rather than racing an in-flight apply.
 	locks sync.Map // workspaceID → *sync.Mutex
+
+	// workspaceAuthorizer enforces per-user workspace scoping. Nil (unit
+	// tests, or a caller with no identity in context — internal callers like
+	// the periodic poller) means unscoped, matching every other integration
+	// service's default before auth is wired up.
+	workspaceAuthorizer func(context.Context, string) error
+}
+
+// SetWorkspaceAuthorizer installs the per-user workspace access boundary
+// applied before every user-facing config read/write and force sync.
+func (s *Service) SetWorkspaceAuthorizer(authorizer func(context.Context, string) error) {
+	if s != nil {
+		s.workspaceAuthorizer = authorizer
+	}
+}
+
+func (s *Service) authorizeWorkspaceAccess(ctx context.Context, workspaceID string) error {
+	if s == nil || s.workspaceAuthorizer == nil {
+		return nil
+	}
+	return s.workspaceAuthorizer(ctx, workspaceID)
 }
 
 func (s *Service) workspaceLock(workspaceID string) *sync.Mutex {
@@ -75,11 +96,17 @@ func (s *Service) Store() *Store {
 
 // GetConfigForWorkspace returns the workspace's config, or nil when unset.
 func (s *Service) GetConfigForWorkspace(ctx context.Context, workspaceID string) (*Config, error) {
+	if err := s.authorizeWorkspaceAccess(ctx, workspaceID); err != nil {
+		return nil, err
+	}
 	return s.store.GetConfigForWorkspace(ctx, workspaceID)
 }
 
 // SetConfigForWorkspace validates and stores the workspace's config.
 func (s *Service) SetConfigForWorkspace(ctx context.Context, workspaceID string, req *SetConfigRequest) (*Config, error) {
+	if err := s.authorizeWorkspaceAccess(ctx, workspaceID); err != nil {
+		return nil, err
+	}
 	if err := req.Normalize(); err != nil {
 		return nil, err
 	}
@@ -93,6 +120,9 @@ func (s *Service) SetConfigForWorkspace(ctx context.Context, workspaceID string,
 // workflows are released back to manual ownership first so they become
 // editable again — a failed release keeps the config so the user can retry.
 func (s *Service) DeleteConfigForWorkspace(ctx context.Context, workspaceID string) error {
+	if err := s.authorizeWorkspaceAccess(ctx, workspaceID); err != nil {
+		return err
+	}
 	lock := s.workspaceLock(workspaceID)
 	lock.Lock()
 	defer lock.Unlock()
@@ -133,6 +163,9 @@ type fetchedFile struct {
 // silent. The outcome (including failures) is recorded on the config row so
 // the UI can surface it.
 func (s *Service) SyncWorkspace(ctx context.Context, workspaceID string) (*SyncResult, error) {
+	if err := s.authorizeWorkspaceAccess(ctx, workspaceID); err != nil {
+		return nil, err
+	}
 	lock := s.workspaceLock(workspaceID)
 	lock.Lock()
 	defer lock.Unlock()
diff --git a/apps/backend/internal/workflowsync/service_authorization_test.go b/apps/backend/internal/workflowsync/service_authorization_test.go
new file mode 100644
index 0000000000..8de20af508
--- /dev/null
+++ b/apps/backend/internal/workflowsync/service_authorization_test.go
@@ -0,0 +1,117 @@
+package workflowsync
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/kandev/kandev/internal/github"
+	"github.com/kandev/kandev/internal/task/repository/repoerrors"
+)
+
+// denyingAuthorizer asserts the exact workspace ID reaches the authorizer,
+// then denies access — simulating a caller who does not own the workspace.
+func denyingAuthorizer(t *testing.T, wantWorkspaceID string) func(context.Context, string) error {
+	t.Helper()
+	return func(_ context.Context, workspaceID string) error {
+		if workspaceID != wantWorkspaceID {
+			t.Fatalf("authorizer workspace = %q, want %q", workspaceID, wantWorkspaceID)
+		}
+		return repoerrors.ErrWorkspaceNotFound
+	}
+}
+
+func TestGetConfigForWorkspace_DeniesForeignWorkspace(t *testing.T) {
+	svc, _ := setupTestService(t, github.NewMockClient())
+	configureWorkspace(t, svc, "victim")
+	svc.SetWorkspaceAuthorizer(denyingAuthorizer(t, "victim"))
+
+	cfg, err := svc.GetConfigForWorkspace(context.Background(), "victim")
+	assert.ErrorIs(t, err, repoerrors.ErrWorkspaceNotFound)
+	assert.Nil(t, cfg)
+}
+
+func TestSetConfigForWorkspace_DeniesForeignWorkspaceAndLeavesConfigUnchanged(t *testing.T) {
+	svc, _ := setupTestService(t, github.NewMockClient())
+	configureWorkspace(t, svc, "victim")
+	before, err := svc.store.GetConfigForWorkspace(context.Background(), "victim")
+	require.NoError(t, err)
+	require.NotNil(t, before)
+
+	svc.SetWorkspaceAuthorizer(denyingAuthorizer(t, "victim"))
+	_, err = svc.SetConfigForWorkspace(context.Background(), "victim", &SetConfigRequest{
+		RepoOwner: "attacker",
+		RepoName:  "evil",
+	})
+	assert.ErrorIs(t, err, repoerrors.ErrWorkspaceNotFound)
+
+	after, err := svc.store.GetConfigForWorkspace(context.Background(), "victim")
+	require.NoError(t, err)
+	require.NotNil(t, after)
+	assert.Equal(t, before.RepoOwner, after.RepoOwner)
+	assert.Equal(t, before.RepoName, after.RepoName)
+}
+
+func TestDeleteConfigForWorkspace_DeniesForeignWorkspaceAndLeavesConfigInPlace(t *testing.T) {
+	svc, applier := setupTestService(t, github.NewMockClient())
+	configureWorkspace(t, svc, "victim")
+
+	svc.SetWorkspaceAuthorizer(denyingAuthorizer(t, "victim"))
+	err := svc.DeleteConfigForWorkspace(context.Background(), "victim")
+	assert.ErrorIs(t, err, repoerrors.ErrWorkspaceNotFound)
+
+	cfg, err := svc.store.GetConfigForWorkspace(context.Background(), "victim")
+	require.NoError(t, err)
+	assert.NotNil(t, cfg)
+	assert.Empty(t, applier.released, "denied delete must not release synced workflows")
+}
+
+func TestSyncWorkspace_DeniesForeignWorkspaceAndNeverApplies(t *testing.T) {
+	svc, applier := setupTestService(t, seededMockClient())
+	configureWorkspace(t, svc, "victim")
+
+	svc.SetWorkspaceAuthorizer(denyingAuthorizer(t, "victim"))
+	_, err := svc.SyncWorkspace(context.Background(), "victim")
+	assert.ErrorIs(t, err, repoerrors.ErrWorkspaceNotFound)
+	assert.Zero(t, applier.callCount(), "denied sync must never reach the applier")
+}
+
+// The internal periodic poller (SyncDueConfigs) and any caller that never
+// wires an authorizer must keep working exactly as before this feature —
+// authorization is opt-in scoping, not a default-deny gate.
+func TestServiceMethods_SucceedWhenNoAuthorizerWired(t *testing.T) {
+	svc, _ := setupTestService(t, seededMockClient())
+	configureWorkspace(t, svc, "ws-1")
+
+	cfg, err := svc.GetConfigForWorkspace(context.Background(), "ws-1")
+	require.NoError(t, err)
+	assert.NotNil(t, cfg)
+
+	_, err = svc.SyncWorkspace(context.Background(), "ws-1")
+	require.NoError(t, err)
+
+	err = svc.DeleteConfigForWorkspace(context.Background(), "ws-1")
+	require.NoError(t, err)
+}
+
+func TestServiceMethods_SucceedWhenAuthorizerAllows(t *testing.T) {
+	svc, _ := setupTestService(t, seededMockClient())
+	configureWorkspace(t, svc, "ws-1")
+	svc.SetWorkspaceAuthorizer(func(context.Context, string) error { return nil })
+
+	cfg, err := svc.GetConfigForWorkspace(context.Background(), "ws-1")
+	require.NoError(t, err)
+	assert.NotNil(t, cfg)
+
+	_, err = svc.SetConfigForWorkspace(context.Background(), "ws-1", &SetConfigRequest{
+		RepoOwner: "acme", RepoName: "flows",
+	})
+	require.NoError(t, err)
+
+	_, err = svc.SyncWorkspace(context.Background(), "ws-1")
+	require.NoError(t, err)
+
+	require.NoError(t, svc.DeleteConfigForWorkspace(context.Background(), "ws-1"))
+}
diff --git a/docs/plans/workflow-sync-workspace-authz/plan.md b/docs/plans/workflow-sync-workspace-authz/plan.md
new file mode 100644
index 0000000000..b9e926bc1c
--- /dev/null
+++ b/docs/plans/workflow-sync-workspace-authz/plan.md
@@ -0,0 +1,141 @@
+---
+spec: docs/specs/workflow-sync-workspace-authz/spec.md
+created: 2026-08-06
+status: building
+---
+
+# Implementation Plan: Workflow Sync — Per-User Workspace Authorization
+
+## Overview
+Close the workspace-scoping gap in `internal/workflowsync` by reusing the exact pattern already
+used by every other per-workspace integration service in this codebase (GitHub, Jira, Linear,
+Slack, Azure DevOps, Automation): a nil-safe `workspaceAuthorizer` field on `workflowsync.Service`,
+set post-construction from `backendapp` with `taskSvc.AuthorizeWorkspaceAccess`, checked first in
+every user-facing service method. Handlers map the resulting `ErrWorkspaceNotFound` to a sanitized
+404. Two tasks, sequential (the second's handler test depends on the first's service change):
+service-layer authorization + wiring, then handler-layer error mapping + HTTP-level regression
+tests.
+
+---
+
+## Backend
+
+### Service layer (`internal/workflowsync/service.go`)
+Add, mirroring `internal/github/service.go:137,169-181` exactly:
+```go
+type Service struct {
+    // ...existing fields...
+    workspaceAuthorizer func(context.Context, string) error
+}
+
+func (s *Service) SetWorkspaceAuthorizer(authorizer func(context.Context, string) error) {
+    if s != nil {
+        s.workspaceAuthorizer = authorizer
+    }
+}
+
+func (s *Service) authorizeWorkspaceAccess(ctx context.Context, workspaceID string) error {
+    if s == nil || s.workspaceAuthorizer == nil {
+        return nil
+    }
+    return s.workspaceAuthorizer(ctx, workspaceID)
+}
+```
+Call `if err := s.authorizeWorkspaceAccess(ctx, workspaceID); err != nil { return nil, err }`
+(or `return err` for the delete path) as the first line of the body in:
+- `GetConfigForWorkspace`
+- `SetConfigForWorkspace` (before `req.Normalize()` — no need to validate an attacker's payload)
+- `DeleteConfigForWorkspace`
+- `SyncWorkspace` (covers `httpForceSync`, and is a no-op for the internal poller's identity-free
+  calls since `authorizeWorkspaceID`'s `callerScope` already treats no-identity as unscoped)
+
+### Wiring (`internal/backendapp/services.go`)
+In `initWorkflowSyncService` (already receives `taskSvc *taskservice.Service` — currently used only
+for `workflowSvc.SetSyncWorkflowOps(taskSvc)`), add immediately after `workflowsync.Provide`
+succeeds, matching the azuredevops in-function style at services.go:609-612:
+```go
+svc.SetWorkspaceAuthorizer(taskSvc.AuthorizeWorkspaceAccess)
+```
+
+### Handler layer (`internal/workflowsync/handlers.go`)
+Add a `workspaceDenied` helper (mirrors `internal/jira/handlers.go:18-22`) and use it in all four
+handlers to return 404 instead of falling into the generic `internalError` 500 path:
+```go
+func workspaceDenied(err error) bool {
+    return errors.Is(err, repoerrors.ErrWorkspaceNotFound)
+}
+```
+`httpGetConfig`, `httpSetConfig`, `httpDeleteConfig`, `httpForceSync`: check
+`workspaceDenied(err)` before the generic error branch and respond
+`ctx.JSON(http.StatusNotFound, gin.H{"error": "workspace not found"})` (no config/repo data in the
+body). Import `github.com/kandev/kandev/internal/task/repository/repoerrors`.
+
+---
+
+## Tests
+
+- **What:** foreign-workspace denial at the service layer for all four entry points.
+  **File:** `apps/backend/internal/workflowsync/service_authorization_test.go` (new).
+  **How:** unit test constructing `Service` directly (no HTTP), installing a fake
+  `SetWorkspaceAuthorizer` that asserts the identity/workspaceID it receives (pattern:
+  `internal/github/handlers_authorization_test.go`'s
+  `TestReviewWatchWebSocketDeniesForeignWorkspaceListAndMutations`), returning
+  `repoerrors.ErrWorkspaceNotFound`; assert each of `GetConfigForWorkspace`,
+  `SetConfigForWorkspace`, `DeleteConfigForWorkspace`, `SyncWorkspace` returns that sentinel and
+  performs no store mutation (re-read the config afterward to confirm it's unchanged).
+- **What:** unscoped callers (nil authorizer, and an authorizer that itself no-ops on missing
+  identity) are unaffected. **File:** same new file. **How:** call the same four methods with no
+  authorizer wired and confirm they succeed as before (regression guard against a nil-safety
+  mistake in `authorizeWorkspaceAccess`).
+- **What:** HTTP-level 404 + no-leak behavior end to end.
+  **File:** `apps/backend/internal/workflowsync/handlers_test.go` (new — this package currently has
+  zero handler-level tests). **How:** `gin.New()` + `RegisterRoutes`, `httptest.NewRequest` +
+  `authn.WithIdentity` on the request context (pattern:
+  `internal/github/controller_auth_identity_test.go`), covering:
+  - Owner identity succeeds on GET/POST/DELETE/sync against their own workspace.
+  - Foreign member identity gets 404 on all four routes against a seeded victim workspace's config,
+    and the response body never contains the victim's repo owner/name/branch/path.
+  - Victim's config is unchanged after the denied POST/DELETE attempts.
+  - Synthetic identity (auth disabled) still succeeds — no regression for the default (auth-off)
+    path.
+- **Regression test that must fail before the fix and pass after:** the foreign-member GET/POST
+  cases above — today they succeed and leak/accept a foreign workspace's config; after the fix they
+  404.
+
+Backend-only change; no frontend/E2E surface (no UI, WS, or client-visible contract changes).
+
+---
+
+## Verification Results
+
+Both tasks done; see each task file's `## Results` for exact per-task output, including two
+Codex-review-driven follow-up fixes (untested production wiring, force-sync's second error path)
+and expanded test coverage. Whole-package summary:
+- `go build ./...`: clean.
+- `gofmt -l internal/workflowsync internal/backendapp`: no output (already formatted).
+- `go vet ./internal/workflowsync/... ./internal/backendapp/...`: clean.
+- `go test -race ./internal/workflowsync/... ./internal/backendapp/...`: both `ok`.
+- `golangci-lint run ./internal/workflowsync/... ./internal/backendapp/... --new-from-rev=main --timeout=5m`: 0 issues.
+- Full `go build ./... && go test -race ./...` (whole backend): all packages `ok` except a
+  pre-existing, unrelated flake in `internal/repoclone`
+  (`TestEnsureWorkspaceClonedWithBasicAuthKeepsCredentialScopedToGitChild/context_cancellation`,
+  a subprocess-timing test) — confirmed unrelated by re-running it in isolation (passes) and by this
+  branch touching neither that package nor anything it depends on.
+
+**Severity correction:** Codex review found that `origin/main` already has a global
+`integrationWorkspaceScopeMiddleware` (`internal/backendapp/main.go:1807`) that path-matches
+`/api/v1/workflow-sync/` and authorizes before any handler runs — the HTTP-level exploit originally
+described in this spec's first draft was already blocked. See spec.md's "Correction" note; this fix
+closes a real but narrower gap (service-layer defense-in-depth, consistency with every sibling
+integration, protection for any future non-HTTP caller), not a currently-open HTTP vulnerability.
+
+---
+
+## Implementation Waves And Parallel Candidates
+
+Sequential (2 tasks; task 2's handler tests depend on task 1's service-layer change):
+- [x] [task-01-service-authorization](task-01-service-authorization.md)
+- [x] [task-02-handler-error-mapping](task-02-handler-error-mapping.md)
+
+## Open Questions
+(none)
diff --git a/docs/plans/workflow-sync-workspace-authz/task-01-service-authorization.md b/docs/plans/workflow-sync-workspace-authz/task-01-service-authorization.md
new file mode 100644
index 0000000000..5a2f3e6cfa
--- /dev/null
+++ b/docs/plans/workflow-sync-workspace-authz/task-01-service-authorization.md
@@ -0,0 +1,66 @@
+---
+id: "01-service-authorization"
+title: "Service-layer workspace authorization"
+status: pending
+wave: 1
+depends_on: []
+plan: "plan.md"
+spec: "../../specs/workflow-sync-workspace-authz/spec.md"
+---
+
+# Task 01: Service-layer workspace authorization
+
+Add the `workspaceAuthorizer` boundary to `workflowsync.Service` and wire it at app boot, following
+the exact pattern already used by `internal/github`, `internal/jira`, `internal/linear`,
+`internal/slack`, `internal/azuredevops`, and `internal/automation`.
+
+## Changes
+
+1. `apps/backend/internal/workflowsync/service.go`:
+   - Add `workspaceAuthorizer func(context.Context, string) error` field to `Service`.
+   - Add `SetWorkspaceAuthorizer` (nil-safe on `s`) and `authorizeWorkspaceAccess` (nil-safe on `s`
+     and the field) methods — copy the shape from `internal/github/service.go:169-181`.
+   - Call `s.authorizeWorkspaceAccess(ctx, workspaceID)` first in `GetConfigForWorkspace`,
+     `SetConfigForWorkspace`, `DeleteConfigForWorkspace`, `SyncWorkspace`, returning the error
+     immediately (before touching `s.store` or `s.applier`).
+2. `apps/backend/internal/backendapp/services.go`: in `initWorkflowSyncService`, after
+   `workflowsync.Provide` succeeds, call `svc.SetWorkspaceAuthorizer(taskSvc.AuthorizeWorkspaceAccess)`
+   before returning `svc`.
+
+## Acceptance
+
+- A caller whose identity does not own the target workspace gets `repoerrors.ErrWorkspaceNotFound`
+  from all four `Service` methods, and no store read/write or applier call happens for that call.
+- A caller with no identity in context, or a synthetic identity, or a `Service` with no authorizer
+  wired, behaves exactly as before this change (fully unscoped, no denial).
+- `go vet` / build clean; no new lint findings under the changed-file thresholds in
+  `apps/backend/.golangci.yml`.
+
+## Verification
+
+```bash
+cd apps/backend && go test ./internal/workflowsync/... -run 'Authoriz|SyncWorkspace|ConfigForWorkspace' -v
+cd apps/backend && go build ./...
+cd apps/backend && golangci-lint run ./internal/workflowsync/... ./internal/backendapp/... --new-from-rev=main --timeout=5m
+```
+
+## Results
+
+- Status: **done**.
+- `go test ./internal/workflowsync/... -run 'Authoriz|DeniesForeign|SucceedWhenNoAuthorizer|SucceedWhenAuthorizerAllows' -v`: 6/6 pass (`TestGetConfigForWorkspace_DeniesForeignWorkspace`,
+  `TestSetConfigForWorkspace_DeniesForeignWorkspaceAndLeavesConfigUnchanged`,
+  `TestDeleteConfigForWorkspace_DeniesForeignWorkspaceAndLeavesConfigInPlace`,
+  `TestSyncWorkspace_DeniesForeignWorkspaceAndNeverApplies`,
+  `TestServiceMethods_SucceedWhenNoAuthorizerWired`, `TestServiceMethods_SucceedWhenAuthorizerAllows`).
+- `go build ./...`: clean.
+- `go test -race ./internal/workflowsync/... ./internal/backendapp/...`: both `ok`.
+- `golangci-lint run ./internal/workflowsync/... ./internal/backendapp/... --new-from-rev=main --timeout=5m`: 0 issues.
+- **Codex review finding (blocker, fixed):** the initial service-layer tests only ever installed a
+  hand-written fake authorizer, so a regression removing the real
+  `svc.SetWorkspaceAuthorizer(taskSvc.AuthorizeWorkspaceAccess)` wiring line in
+  `initWorkflowSyncService` would leave every test green. Added
+  `apps/backend/internal/backendapp/workflowsync_wiring_test.go`
+  (`TestInitWorkflowSyncService_WiresRealWorkspaceAuthorization`), which calls
+  `initWorkflowSyncService` itself with a real `taskservice.Service` backed by SQLite. Verified by
+  temporarily commenting out the wiring line: the new test failed for the expected reason; restoring
+  the line made it pass again (confirmed via `go build`/full suite afterward).
diff --git a/docs/plans/workflow-sync-workspace-authz/task-02-handler-error-mapping.md b/docs/plans/workflow-sync-workspace-authz/task-02-handler-error-mapping.md
new file mode 100644
index 0000000000..bf4245e799
--- /dev/null
+++ b/docs/plans/workflow-sync-workspace-authz/task-02-handler-error-mapping.md
@@ -0,0 +1,75 @@
+---
+id: "02-handler-error-mapping"
+title: "Handler error mapping + HTTP regression tests"
+status: pending
+wave: 1
+depends_on: ["01-service-authorization"]
+plan: "plan.md"
+spec: "../../specs/workflow-sync-workspace-authz/spec.md"
+---
+
+# Task 02: Handler error mapping + HTTP regression tests
+
+Map the new `ErrWorkspaceNotFound` denial to a sanitized 404 in the HTTP layer, and add the
+HTTP-level regression coverage this package currently lacks entirely (`handlers_test.go` does not
+exist yet).
+
+## Changes
+
+1. `apps/backend/internal/workflowsync/handlers.go`:
+   - Import `errors` (already imported) and
+     `github.com/kandev/kandev/internal/task/repository/repoerrors`.
+   - Add `func workspaceDenied(err error) bool { return errors.Is(err, repoerrors.ErrWorkspaceNotFound) }`
+     (mirror `internal/jira/handlers.go:18-22`).
+   - In `httpGetConfig`, `httpSetConfig`, `httpDeleteConfig`, `httpForceSync`: check
+     `workspaceDenied(err)` before the existing generic-error branch and respond
+     `ctx.JSON(http.StatusNotFound, gin.H{"error": "workspace not found"})`. Do not include the
+     underlying service error or any config fields in this response.
+2. New file `apps/backend/internal/workflowsync/handlers_test.go` — HTTP-level tests using
+   `gin.New()` + `RegisterRoutes` + `httptest.NewRequest` + `authn.WithIdentity` on the request
+   context (pattern: `internal/github/controller_auth_identity_test.go`).
+
+## Acceptance (from spec Scenarios)
+
+- Owner identity: GET/POST/DELETE/sync all succeed against their own workspace, unchanged from
+  pre-fix behavior.
+- Foreign member identity against a seeded victim workspace's config: all four routes return 404,
+  and the response body contains none of the victim's repo owner/name/branch/path/project_path.
+- The victim's config is byte-for-byte unchanged after the denied POST/DELETE attempts (re-read via
+  the service and compare).
+- Synthetic identity (auth disabled) succeeds on all four routes — no regression for the default
+  path.
+- The two "foreign member GET/POST" cases are the regression tests: written to fail against
+  pre-task-01 code (they'd get 200 + leaked/accepted data) and pass after task 01 + this task.
+
+## Verification
+
+```bash
+cd apps/backend && go test ./internal/workflowsync/... -run 'TestHTTP|TestConfig|TestForceSync' -v
+cd apps/backend && go test ./internal/workflowsync/... -v
+cd apps/backend && golangci-lint run ./internal/workflowsync/... --new-from-rev=main --timeout=5m
+cd apps/backend && go test -race ./internal/workflowsync/...
+```
+
+## Results
+
+- Status: **done**, including two follow-up fixes from an independent Codex review round.
+- `go test ./internal/workflowsync/... -run 'TestHTTPHandlers' -v`: all pass
+  (`TestHTTPHandlers_OwnerSucceedsOnAllRoutes`, `TestHTTPHandlers_SyntheticIdentitySucceedsOnAllRoutes`,
+  `TestHTTPHandlers_ForeignMemberDeniedOnAllRoutesWithoutLeaking`, each table-driven across
+  get/post/delete/sync, plus `TestHTTPHandlers_ForceSyncDeniesSecondLookupAfterAccessRevoked`).
+- Regression confirmed: before the task-01 service change, the get/post/delete/sync subtests failed
+  with 500s and leaked/accepted the foreign workspace's config (verified during TDD).
+- **Codex review finding (blocker, fixed):** `httpForceSync`'s second call
+  (`GetConfigForWorkspace`, used to build the response after a successful sync) did not map
+  `ErrWorkspaceNotFound` to 404 — a race where access is revoked between the sync and the follow-up
+  read fell through to a generic 500. Fixed with the same `workspaceDenied` check; covered by
+  `TestHTTPHandlers_ForceSyncDeniesSecondLookupAfterAccessRevoked` (verified to fail pre-fix, pass
+  post-fix).
+- **Codex review finding (suggestion, fixed):** owner/synthetic-identity coverage was GET-only and
+  the leak/mutation assertions didn't cover branch/path or the full config. Rewritten as
+  table-driven tests across all four operations (`TestHTTPHandlers_OwnerSucceedsOnAllRoutes`,
+  `TestHTTPHandlers_SyntheticIdentitySucceedsOnAllRoutes`), with distinctive branch/path fixture
+  values and a full-struct `before`/`after` config comparison in the denial test.
+- `go test -race ./internal/workflowsync/... ./internal/backendapp/...`: both `ok`.
+- `golangci-lint run ./internal/workflowsync/... --new-from-rev=main --timeout=5m`: 0 issues.
diff --git a/docs/specs/workflow-sync-workspace-authz/spec.md b/docs/specs/workflow-sync-workspace-authz/spec.md
new file mode 100644
index 0000000000..5f8dedddc3
--- /dev/null
+++ b/docs/specs/workflow-sync-workspace-authz/spec.md
@@ -0,0 +1,96 @@
+---
+status: building
+created: 2026-08-06
+owner: nova28
+---
+
+# Workflow Sync — Per-User Workspace Authorization
+
+## Why
+Every other per-workspace integration service (GitHub, Jira, Linear, Slack, Azure DevOps,
+Automation) enforces that a caller-supplied `workspace_id` belongs to the requesting user *inside
+the service itself* — `SetWorkspaceAuthorizer` + a check at the top of every user-facing method —
+in addition to the global `integrationWorkspaceScopeMiddleware`
+(`internal/backendapp/main.go`/`helpers.go`) that already gates their HTTP routes by path prefix.
+`internal/workflowsync` is the one integration service that never adopted the service-layer half of
+that pattern: its `Service` methods take a caller-supplied `workspace_id` straight from the caller
+with no ownership check of their own.
+
+**Correction (found during review):** an earlier draft of this spec claimed the HTTP endpoints
+(`/api/v1/workflow-sync/config`, `/api/v1/workflow-sync/sync`) had no ownership check at all and were
+directly exploitable by an authenticated member. That was wrong — those paths are already listed in
+`integrationWorkspacePrefixes` and covered by the global middleware, which authorizes before any
+workflow-sync handler runs, exactly like `/api/v1/jira/`, `/api/v1/github/`, etc. The actual gap this
+spec closes is narrower: `workflowsync.Service` has no authorization boundary of its own, unlike
+every sibling integration service, so (a) it is the one integration whose safety depends entirely on
+the route-level middleware never being bypassed, misconfigured, or missing this path prefix, with no
+independent second layer, and (b) any future non-HTTP caller of the service (a WS handler, an MCP
+tool, a plugin, a different mount point) would inherit no protection at all, unlike every sibling
+service where the constructor-level check still applies regardless of how the call arrived. This is
+a defense-in-depth and consistency fix, not a closure of a currently open HTTP exploit.
+
+## What
+- The workflow-sync config read endpoint (`GET /api/v1/workflow-sync/config`) SHALL deny a request
+  for a `workspace_id` the caller does not own.
+- The workflow-sync config write endpoint (`POST /api/v1/workflow-sync/config`) SHALL deny writing a
+  config for a `workspace_id` the caller does not own.
+- The workflow-sync config delete endpoint (`DELETE /api/v1/workflow-sync/config`) SHALL deny
+  deleting a config for a `workspace_id` the caller does not own.
+- The force-sync endpoint (`POST /api/v1/workflow-sync/sync`) SHALL deny triggering a sync for a
+  `workspace_id` the caller does not own.
+- A denied request SHALL be indistinguishable from a request against a nonexistent workspace (404,
+  no existence leak) — consistent with every other per-user-scoped integration in this codebase.
+- Requests from an **unscoped caller** — no identity in context (internal callers: the periodic sync
+  poller, the event bus) or a synthetic identity (auth disabled) — SHALL continue to work exactly as
+  before this fix; this feature only closes the gap for caller-supplied `workspace_id` values
+  reaching these endpoints from an authenticated HTTP request.
+- Workspaces with no owner (`owner_id = ''`, pre-auth rows not yet claimed by the setup wizard)
+  SHALL remain visible to any authenticated member, matching the existing workspace-visibility rule
+  used everywhere else.
+
+## Permissions
+Reuses the existing per-user workspace scoping rule documented in
+`apps/backend/AGENTS.md` ("Opt-in authentication & per-user scoping"):
+- No identity in context, or a synthetic identity → unscoped (today's pre-auth behavior).
+- Real identity → the workspace is visible only if its `owner_id` is empty or matches the caller.
+- Denial uses the `ErrWorkspaceNotFound` sentinel — the same value the task service, GitHub, Jira,
+  Linear, Slack, and Azure DevOps services already return for this class of denial — so a foreign
+  workspace and a missing workspace produce the same observable response.
+
+This spec does not introduce a new permission concept; it applies the existing one to a service that
+missed it.
+
+## Failure modes
+- **Caller lacks access to the target workspace:** the request is denied with the sanitized
+  not-found response before the config store (or the sync/apply pipeline) is touched. No config
+  contents, repo identity, or sync status for the foreign workspace are ever included in the denial.
+- **Workspace authorizer not wired** (e.g. a unit test constructing `workflowsync.Service` directly
+  without calling `SetWorkspaceAuthorizer`): the service behaves as unscoped, matching every other
+  integration service's nil-safe default — this preserves existing tests and call sites that don't
+  go through the full app-boot wiring.
+
+## Scenarios
+- **GIVEN** two workspaces A (owned by user `alice`) and B (owned by user `bob`) each with their own
+  workflow-sync config, **WHEN** `bob` calls `GET /api/v1/workflow-sync/config?workspace_id=<A>`,
+  **THEN** the response is 404 and contains no data about workspace A's config.
+- **GIVEN** the same setup, **WHEN** `bob` calls
+  `POST /api/v1/workflow-sync/config?workspace_id=<A>` with an attacker-controlled repo payload,
+  **THEN** the request is denied (404) and workspace A's stored config is unchanged.
+- **GIVEN** the same setup, **WHEN** `bob` calls `DELETE /api/v1/workflow-sync/config?workspace_id=<A>`
+  or `POST /api/v1/workflow-sync/sync?workspace_id=<A>`, **THEN** both are denied (404) and workspace
+  A's config/sync state is unaffected.
+- **GIVEN** workspace A owned by `alice`, **WHEN** `alice` calls any of the four endpoints against her
+  own workspace, **THEN** the request succeeds exactly as before this fix.
+- **GIVEN** `features.auth` is disabled (synthetic identity) or the caller is an internal caller (no
+  identity in context, e.g. the periodic sync poller), **WHEN** any workflow-sync entry point runs,
+  **THEN** it is unaffected — no denial, same behavior as before this fix.
+
+## Out of scope
+- Changing the periodic poller (`SyncDueConfigs`/`SyncWorkspace` invoked internally) to carry or
+  require an identity — it is a correct internal caller today and stays unscoped by the existing
+  `callerScope` rule.
+- Any change to GitHub or GitLab repository-level authorization (App installation scope, PAT scope)
+  — this spec is strictly about the `workspace_id` ownership boundary on the workflow-sync HTTP
+  surface.
+- Adding workspace authorization to any other integration package — all of them already have it.
+- New data model or schema changes — no persistent state changes.