unofficially add wf.std as source

src/wf_mcp/broker/service/builtins.py

@@ -0,0 +1,23 @@
+from __future__ import annotations
+
+from typing import Any
+
+from wf_authoring import NodeSpec, node, runtime_error
+
+from .specs import qualify_spec
+
+BUILTIN_CONNECTION_ID = "wf.std"
+"""Internal source id for workflow standard-library node specs."""
+
+
+def builtin_specs() -> dict[str, NodeSpec[Any, Any]]:
+    """Return built-in NodeSpecs available to raw broker workflow plans."""
+    specs = [
+        node(
+            runtime_error,
+            name="runtime_error",
+            description="Fail the current workflow branch with a runtime error.",
+        )
+    ]
+    qualified_specs = [qualify_spec(BUILTIN_CONNECTION_ID, spec) for spec in specs]
+    return {spec.name: spec for spec in qualified_specs}

src/wf_mcp/broker/service/core.py

@@ -23,6 +23,7 @@ from ..catalog import CombinedCatalog, snapshot_from_specs
 from ..discovery import discover_connection_capabilities, specs_from_discovered_tools
 from ..events import McpEvent, make_event
 from .adapters import require_adapter
+from .builtins import BUILTIN_CONNECTION_ID, builtin_specs
 from .specs import get_qualified_spec, qualify_spec
 
 
@@ -36,6 +37,12 @@ class WfMcpService:
         default_factory=dict
     )
     events: list[McpEvent] = field(default_factory=list)
+    include_builtin_specs: bool = True
+
+    def __post_init__(self) -> None:
+        """Install broker-local standard-library specs when enabled."""
+        if self.include_builtin_specs:
+            self.specs_by_connection.setdefault(BUILTIN_CONNECTION_ID, builtin_specs())
 
     def register_connection(self, connection: ConnectionConfig) -> None:
         parse_connection_id(connection.id)