Headers not passed to MCP ?

[aheritier]

Description

Following https://grafana.com/docs/grafana-cloud/machine-learning/assistant/configure/cloud-mcp/#client-configuration I tried to configure the MCP like this

grafana:
    remote:
      url: https://mcp.grafana.com/mcp
      transport_type: streamable
      headers:
        X-Grafana-URL: https://XXXXX.grafana.net/

It still ask for the grafana URL

Expected Behavior

Based on the documentation it shouldn't

Actual Behavior

The authentication screen ask for the instance URL

Steps to Reproduce

Detailed steps to reproduce the bug:

1. Reference the MCP server as described above
2. Authenticate
3. The screen asks you the instance to use

Environment

• Docker Agent Version: main
• OS & Terminal: macOS
• Model Used: sonnet