feat: expose canonical output bindings to mcp

src/wf_mcp/proxy/runtime.py

@@ -49,6 +49,7 @@ _SEARCH_ALWAYS_VISIBLE_TOOL_NAMES = [
     "wf.workflow.set_draft_name",
     "wf.workflow.set_draft_route",
     "wf.workflow.set_step_input_bindings",
+    "wf.workflow.set_step_output_bindings",
     "wf.workflow.set_step_input_map",
     "wf.workflow.set_step_output_map",
     "wf.workflow.set_workflow_output_map",

src/wf_mcp/workflow_surface/models.py

@@ -239,6 +239,15 @@ class SetStepInputBindingsRequest(BaseModel):
     bindings: DraftInputBindings
 
 
+class SetStepOutputBindingsRequest(BaseModel):
+    """Replace one step's complete ordered canonical output-binding list."""
+
+    workspace_id: WorkspaceId
+    revision: int = Field(ge=1, description="Expected current workspace revision.")
+    step_id: NonEmptyString
+    bindings: DraftOutputBindings
+
+
 class SetStepOutputMapRequest(BaseModel):
     """Typed MCP request for replacing or merging one step output map."""
 

src/wf_mcp/workflow_surface/tools.py

@@ -37,6 +37,7 @@ from .models import (
     SetDraftRouteRequest,
     SetStepInputBindingsRequest,
     SetStepInputMapRequest,
+    SetStepOutputBindingsRequest,
     SetStepOutputMapRequest,
     SetWorkflowOutputMapRequest,
     TraceRange,
@@ -464,6 +465,26 @@ def register_workflow_tools(server: FastMCP[Any], service: WfMcpService) -> None
             )
         )
 
+    @server.tool(
+        name="wf.workflow.set_step_output_bindings",
+        title="Set Step Output Bindings",
+        description=(
+            "Replace one capability step's complete ordered output bindings. "
+            "Repeated sources are valid fan-out; state targets must not overlap."
+        ),
+    )
+    async def set_step_output_bindings(
+        request: SetStepOutputBindingsRequest,
+    ) -> DraftWorkspaceResult:
+        return DraftWorkspaceResult.model_validate(
+            await handlers.set_step_output_bindings(
+                workspace_id=request.workspace_id,
+                revision=request.revision,
+                step_id=request.step_id,
+                bindings=request.bindings,
+            )
+        )
+
     @server.tool(
         name="wf.workflow.set_step_output_map",
         title="Set Step Output Map",