fix: opt draft storage into real callers

src/wf_mcp/broker/config.py

@@ -163,7 +163,9 @@ def build_service_from_config(config: BrokerConfig) -> WfMcpService:
     """Create a broker service with SDK adapters for configured connections."""
     runtime_factory = PersistentSessionFactory()
     store_roots = config.store_roots
-    workflow_stores = file_workflow_stores(store_roots.workflow_root)
+    # The broker's documented workflow/draft tools are a draft-bearing
+    # composition, so opt into the otherwise disabled draft store explicitly.
+    workflow_stores = file_workflow_stores(store_roots.workflow_root, drafts=True)
     # Keep FileStore as the compatibility facade on WfMcpService.store while
     # focused services receive role-specific stores.
     auth_store = FileAuthStore(store_roots.auth_root)

src/wf_mcp/broker/server.py

@@ -64,7 +64,8 @@ def workflow_server_from_service(
         raise ValueError("MCP-backed WorkflowServer requires workflow stores")
 
     context = context_from_service(service)
-    api: WorkflowApi = durable_workflow_api(context)
+    # MCP's documented workflow server includes mutable draft operations.
+    api: WorkflowApi = durable_workflow_api(context, drafts=True)
     source_diagnostics = SourceDiagnosticsProvider(
         connection_lookup=service.connections.get,
         auth_store=service.auth_store or service.store,

src/wf_mcp/workflow_surface/handlers.py

@@ -13,14 +13,16 @@ if TYPE_CHECKING:
 class WorkflowSurfaceHandlers(WorkflowApi):
     """Compatibility wrapper for old wf_mcp.workflow_surface imports.
 
-    New code should construct `WorkflowApi(context_from_service(service))`
+    New code should construct `WorkflowApi(context_from_service(service), drafts=True)`
     directly. This shim keeps tests and legacy broker artifact tools working
     for legacy callers.
     """
 
     def __init__(self, service: WfMcpService) -> None:
         self.service = service
-        super().__init__(context_from_service(service))
+        # This compatibility surface exposes the draft methods used by the
+        # workflow-surface tests and legacy broker artifact tools.
+        super().__init__(context_from_service(service), drafts=True)
 
 
 __all__ = ["WorkflowSurfaceHandlers"]

src/wf_mcp/workflow_surface/tools.py

@@ -71,7 +71,9 @@ from .models import (
 
 def register_workflow_tools(server: FastMCP[Any], service: WfMcpService) -> None:
     """Register stable workflow tools on the public MCP server surface."""
-    handlers = WorkflowApi(context_from_service(service))
+    # This MCP surface registers the draft authoring tools below, so its API
+    # composition must explicitly opt into the draft services.
+    handlers = WorkflowApi(context_from_service(service), drafts=True)
 
     @server.tool(
         name="wf.workflow.list_artifacts",