call capability result!

src/wf_mcp/workflow_surface/handlers.py

@@ -19,7 +19,13 @@ from wf_artifacts import (
     validate_workflow_draft,
     validate_deployment_dependencies,
 )
-from wf_platform import CapabilityRef, NodeSpecInventory, hash_json_schema, page_items
+from wf_platform import (
+    CapabilityRef,
+    CapabilitySource,
+    NodeSpecInventory,
+    hash_json_schema,
+    page_items,
+)
 from wf_authoring import build_async_registry
 from wf_core import RuntimeContext
 
@@ -118,8 +124,15 @@ class WorkflowSurfaceHandlers:
         result = await handler(payload, RuntimeContext(current_node_id=spec.name))
         return {
             "qualified_name": spec.name,
+            "source_id": _source_id_for_capability(
+                self.service.capability_sources,
+                spec.name,
+            ),
+            "kind": "node_spec",
+            "deployment_id": None,
             "outcome": result["outcome"],
             "output": result["output"],
+            "diagnostics": [],
         }
 
     def _wrapper_artifact_for_capability_name(
@@ -176,8 +189,12 @@ class WorkflowSurfaceHandlers:
         )
         return {
             "qualified_name": _artifact_capability_id(artifact),
+            "source_id": "workflow",
+            "kind": "wrapper_artifact",
+            "deployment_id": deployment_id,
             "outcome": run.status.value,
             "output": run.output,
+            "diagnostics": [],
         }
 
     async def save_artifact(self, artifact: dict[str, Any]) -> dict[str, Any]:
@@ -566,6 +583,17 @@ def _schema_field_names(schema: dict[str, Any]) -> list[str]:
     return sorted(str(name) for name in properties)
 
 
+def _source_id_for_capability(
+    sources: dict[str, CapabilitySource],
+    qualified_name: str,
+) -> str | None:
+    """Return the source that currently owns one workflow capability."""
+    for source in sources.values():
+        if qualified_name in source.capabilities.node_specs:
+            return source.id
+    return None
+
+
 def _capability_name(qualified_name: str) -> str | None:
     """Return the local name of one qualified capability ref if it is valid."""
     try:

src/wf_mcp/workflow_surface/models.py

@@ -0,0 +1,34 @@
+from __future__ import annotations
+
+from typing import Any, Literal
+
+from pydantic import BaseModel, Field
+
+
+class CallCapabilityResult(BaseModel):
+    """Inspector-visible response contract for testing one workflow capability."""
+
+    qualified_name: str = Field(description="Capability name that was executed.")
+    source_id: str | None = Field(
+        default=None,
+        description="Capability source that owned the executed node spec.",
+    )
+    kind: Literal["node_spec", "wrapper_artifact"] = Field(
+        description=(
+            "Indicates whether this call executed a live NodeSpec or a saved "
+            "wrapper artifact."
+        )
+    )
+    deployment_id: str | None = Field(
+        default=None,
+        description="Deployment used to resolve logical bindings, if any.",
+    )
+    outcome: str = Field(description="Workflow outcome returned by the capability.")
+    output: dict[str, Any] | None = Field(
+        default=None,
+        description="Normalized workflow-facing output payload.",
+    )
+    diagnostics: list[dict[str, Any]] = Field(
+        default_factory=list,
+        description="Structured diagnostics. Empty for successful calls.",
+    )

src/wf_mcp/workflow_surface/tools.py

@@ -9,6 +9,7 @@ from wf_artifacts.models import RequiredCapability
 from wf_mcp.broker.service import WfMcpService
 
 from .handlers import WorkflowSurfaceHandlers
+from .models import CallCapabilityResult
 
 
 def register_workflow_tools(server: FastMCP[Any], service: WfMcpService) -> None:
@@ -62,11 +63,13 @@ def register_workflow_tools(server: FastMCP[Any], service: WfMcpService) -> None
         qualified_name: str,
         payload: dict[str, Any],
         deployment_id: str | None = None,
-    ) -> dict[str, Any]:
-        return await handlers.call_capability(
-            qualified_name=qualified_name,
-            payload=payload,
-            deployment_id=deployment_id,
+    ) -> CallCapabilityResult:
+        return CallCapabilityResult.model_validate(
+            await handlers.call_capability(
+                qualified_name=qualified_name,
+                payload=payload,
+                deployment_id=deployment_id,
+            )
         )
 
     @server.tool(