n8n-nodes-mcp-trigger-context

Community MCP Trigger node for current n8n 2.x installations that forwards incoming MCP HTTP request context into tool execution input as mcpRequest.

Install

npm install @mmn-systems/n8n-nodes-mcp-trigger-context

Repository: https://github.com/max00346/n8n-nodes-mcp-trigger-context

What it solves

Built-in MCP trigger tool calls do not expose HTTP headers/query/path directly to tool parameter expressions.

This node injects:

• $json.mcpRequest.headers
• $json.mcpRequest.query
• $json.mcpRequest.params
• $json.mcpRequest.method
• $json.mcpRequest.path

For MCP tool calls on current n8n 2.x, the same request context is also embedded into the internal mcpToolCall.arguments payload so queue-mode worker executions receive the same header/query/path context as direct executions.

Example

In a connected HTTP Request tool/node expression:

={{ $json.mcpRequest.headers.authorization }}

Notes

• Targets current n8n 2.x MCP Trigger internals.
• Requires n8n installations that include @n8n/n8n-nodes-langchain.

Troubleshooting

If n8n shows Class could not be found after upgrading:

1. Remove the old package from Community Nodes in n8n.
2. Stop n8n and delete the old install at ~/.n8n/nodes/node_modules/@mmn-systems/n8n-nodes-mcp-trigger-context.
3. Start n8n and install a pinned version, for example @mmn-systems/[email protected].