Pennylane MCP Server and API by Cotlet for ChatGPT

dev.cotlet/pennylane

Pennylane business accounting and invoicing MCP server: create customer invoice, send invoice.

client:ChatGPT transport:streamable-http

Install Pennylane MCP Server and API by Cotlet in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://cotlet.dev/mcp/v1/pennylane/connect

Custom connectors are a paid-plan feature and take a remote URL only. ChatGPT cannot run a packaged server locally. ChatGPT docs