Description

n8n-nodes-mcp-trigger-extended-header-context

Community node package for an n8n MCP Server Trigger variant named MCP Trigger Extended Header Context.

It stays close to n8n’s official MCP Server Trigger and adds one behavior: inbound HTTP headers whose names start with X-MCP- are injected into MCP tool-call arguments as lowercase keys. Server-side header values override LLM-provided arguments with the same key.

You can mark selected tool parameters as optional for MCP clients so omitted values do not fail tool validation. Header-backed x-mcp-* parameters are hidden from MCP clients by default while still being injected from inbound request headers on the server.

Install in n8n Community Nodes with package name n8n-nodes-mcp-trigger-extended-header-context.

Subworkflows

When using this trigger with a subworkflow tool, configure subworkflow input parameters with the same lowercase names as the injected headers. For example, header X-MCP-User-ID is injected as x-mcp-user-id, so the subworkflow must define an input parameter named x-mcp-user-id to receive it.

License

This package extends the code and assets from n8n’s official MCP Server Trigger. See LICENSE.md and NOTICE.md.