Postman FlowsFlows referenceBlocksTrigger

The MCP block

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With an MCP block, you can create a flow that acts as an MCP server. In the MCP block, you define a schema that describes the MCP tools the flow will expose as an MCP server. The MCP block is one type of trigger block required to create a deployable flow that runs in the Postman cloud.

The MCP block can’t be deleted.

Outputs

  • Headers - Sends the request headers.
  • Params - Sends the request’s query parameters.
  • Body - Sends the request body.

Setup

To add an MCP block to a flow, click Change trigger on the Start, Request, or Schedule block and select MCP icon MCP.

To define the MCP server’s tools, click Edit icon Define custom schema and enter the schema according to the MCP tool definition structure. You can also click Magic icon Generate with AI to open Agent Mode, where you can create the schema with AI assistance.