Failed to parse message

[rootsmusic]

I've signed into Docker Desktop for Windows 4.61.0 (version 29.2.1, build a5c7197) and installed this repo's MCP server (by clicking on the README's button for "VS Code"). When I try to start the MCP server in VS Code for Windows 1.111.0, why does the output show a bunch of warnings?

2026-03-10 09:46:16.815 [info] Connection state: Running
2026-03-10 09:46:17.465 [warning] Failed to parse message: "info: ModelContextProtocol.Server.StdioServerTransport[857250842]\n"
2026-03-10 09:46:17.465 [warning] Failed to parse message: "      Server (stream) (McpSamples.AwesomeCopilot.HybridApp) transport reading messages.\n"
2026-03-10 09:46:17.528 [warning] Failed to parse message: "info: Microsoft.Hosting.Lifetime[0]\n"
2026-03-10 09:46:17.528 [warning] Failed to parse message: "      Application started. Press Ctrl+C to shut down.\n"
2026-03-10 09:46:17.528 [warning] Failed to parse message: "info: Microsoft.Hosting.Lifetime[0]\n"
2026-03-10 09:46:17.528 [warning] Failed to parse message: "      Hosting environment: Production\n"
2026-03-10 09:46:17.528 [warning] Failed to parse message: "info: Microsoft.Hosting.Lifetime[0]\n"
2026-03-10 09:46:17.529 [warning] Failed to parse message: "      Content root path: /app\n"
2026-03-10 09:46:17.538 [warning] Failed to parse message: "info: ModelContextProtocol.Server.McpServer[570385771]\n"
2026-03-10 09:46:17.538 [warning] Failed to parse message: "      Server (McpSamples.AwesomeCopilot.HybridApp 1.0.0.0) method 'initialize' request handler called.\n"
2026-03-10 09:46:17.556 [warning] Failed to parse message: "info: ModelContextProtocol.Server.McpServer[570385771]\n"
2026-03-10 09:46:17.556 [warning] Failed to parse message: "      Server (McpSamples.AwesomeCopilot.HybridApp 1.0.0.0), Client (Visual Studio Code 1.111.0) method 'tools/list' request handler called.\n"
2026-03-10 09:46:17.556 [warning] Failed to parse message: "info: ModelContextProtocol.Server.McpServer[570385771]\n"
2026-03-10 09:46:17.556 [warning] Failed to parse message: "      Server (McpSamples.AwesomeCopilot.HybridApp 1.0.0.0), Client (Visual Studio Code 1.111.0) method 'logging/setLevel' request handler called.\n"
2026-03-10 09:46:17.556 [warning] Failed to parse message: "info: ModelContextProtocol.Server.McpServer[570385771]\n"
2026-03-10 09:46:17.557 [warning] Failed to parse message: "      Server (McpSamples.AwesomeCopilot.HybridApp 1.0.0.0), Client (Visual Studio Code 1.111.0) method 'prompts/list' request handler called.\n"
2026-03-10 09:46:17.560 [warning] Failed to parse message: "info: ModelContextProtocol.Server.McpServer[1867955179]\n"
2026-03-10 09:46:17.560 [warning] Failed to parse message: "      Server (McpSamples.AwesomeCopilot.HybridApp 1.0.0.0), Client (Visual Studio Code 1.111.0) method 'initialize' request handler completed in 16.1192ms.\n"
2026-03-10 09:46:17.560 [warning] Failed to parse message: "info: ModelContextProtocol.Server.McpServer[1867955179]\n"
2026-03-10 09:46:17.560 [warning] Failed to parse message: "      Server (McpSamples.AwesomeCopilot.HybridApp 1.0.0.0), Client (Visual Studio Code 1.111.0) method 'logging/setLevel' request handler completed in 4.25ms.\n"
2026-03-10 09:46:17.562 [warning] Failed to parse message: "info: ModelContextProtocol.Server.McpServer[1867955179]\n"
2026-03-10 09:46:17.562 [warning] Failed to parse message: "      Server (McpSamples.AwesomeCopilot.HybridApp 1.0.0.0), Client (Visual Studio Code 1.111.0) method 'prompts/list' request handler completed in 5.5482ms.\n"
2026-03-10 09:46:17.564 [info] Discovered 2 tools
2026-03-10 09:46:17.564 [warning] Failed to parse message: "info: ModelContextProtocol.Server.McpServer[1867955179]\n"
2026-03-10 09:46:17.564 [warning] Failed to parse message: "      Server (McpSamples.AwesomeCopilot.HybridApp 1.0.0.0), Client (Visual Studio Code 1.111.0) method 'tools/list' request handler completed in 8.0794ms.\n"

mcp.json

Details

	"servers": {
		"io.github.github/github-mcp-server": {
			"type": "http",
			"url": "https://api.githubcopilot.com/mcp/",
			"headers": {
				"Authorization": "${input:Authorization}"
			},
			"gallery": "https://api.mcp.github.com",
			"version": "0.24.0"
		},
		"awesome-copilot": {
			"command": "docker",
			"args": [
				"run",
				"-i",
				"--rm",
				"ghcr.io/microsoft/mcp-dotnet-samples/awesome-copilot:latest"
			],
			"type": "stdio"
		},
		"github": {
			"type": "http",
			"url": "https://api.githubcopilot.com/mcp/"
		},
	},
	"inputs": [
		{
			"id": "Authorization",
			"type": "promptString",
			"description": "Authentication token (PAT or App token)",
			"password": true
		}
	]
```</details>

[aaronpowell]

@justinyoo any thoughts?

[justinyoo]

@rootsmusic Yep, that's expected in VS Code. If you run the docker container directly in a terminal, it doesn't show up that error. It's because VS Code parses those log messages as JSON objects/strings.