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.

Version 0.1.7 tracks the MCP Server Trigger from n8n@2.30.7, which is identical to the trigger shipped with n8n 2.30.5. It includes upstream MCP error signaling and idle Streamable HTTP session cleanup.

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.