[Feature Request]: Headers passthrough from mcp server configuration

[playground]

@kevalmahajan here it is.

🧭 Type of Feature

Please select the most appropriate category:

• [X] Enhancement to existing functionality
• [ ] New feature or capability
• [ ] New MCP-compliant server
• [ ] New component or integration
• [ ] Developer tooling or test improvement
• [ ] Packaging, automation and deployment (ex: pypi, docker, quay.io, kubernetes, terraform)
• [ ] Other (please describe below)

🧭 Epic

Title: Headers passthrough from mcp server configuration Goal: Headers passthrough Why now: Not yet supported

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🙋♂️ User Story 1

As a: I would like to be able to pass in custom headers I want: Some tools require that information to function So that:

✅ Acceptance Criteria

Scenario: claude_desktop_config.json
{
  "mcpServers": {
    "open-horizon-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-remote",
        "http://localhost:4444/servers/224831b6cd344fb6b35179401ee8b7cc/mcp",
        "--header",
        "exchange-org:<orgId>",
        "--header",
        "exchange-url:http://open-horizon.lfedge.iol.unh.edu:3090/v1/orgs",
        "--header",
        "exchange-credential:<your_credential",
        "--header",
        "Authorization:Bearer *****************"
      ]
    }
  }
}

🔗 MCP Standards Check

• [X] Change adheres to current MCP specifications
• [X] No breaking changes to existing MCP-compliant integrations
• [ ] If deviations exist, please describe them below: