Node Reference
MCP Output Node
Select the workflow value returned by a published MCP tool.
The MCP Output node is part of Builder Studio's MCP Server Builder. It selects which value from a workflow is returned to the MCP client that called the tool. Where an MCP Toolnode defines the tool's inputs and entry point, the MCP Output node defines the result the caller receives.
Availability
The MCP Server Builder node types are part of the published user MCP roadmap and are not yet available to place on the canvas in this build. This page documents their intended purpose so you can plan around them. For what is live today, see the marketplace and the Builder MCP CLI.
What it is meant to do
- Pick the workflow value that becomes the published tool's return payload.
- Give a published MCP server a single, predictable result per tool call, instead of returning the whole graph state.
One tool, one output
Think of an MCP Tool node as the function signature and the MCP Output node as its
return statement. The tool defines what callers send in; the output defines what they get back.How it relates to the other builder nodes
- MCP Tool— defines the tool surface and inputs.
- MCP Output — selects the value returned to the client.
- MCP Credential— declares encrypted credentials a tool handler needs.
Where to continue today
Use the Marketplace overview for the supported published-MCP consumption paths and Building for the marketplace for the current publishing model.
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