gopls mcp を使う

$ gopls -h
中略
flags:
  -mcp.listen=string
        experimental: address on which to listen for model context protocol connections. If port is localhost:0, pick a random port in localhost instead.

$ gopls serve -mcp.listen="localhost:0"
mcp.go:48: Gopls MCP server: starting up on http
mcp.go:73: mcp http server listening

"mcpServers": {
  "gopls": {
    "type": "stdio",
    "command": "gopls",
    "args": [
      "serve",
      "-mcp.listen=localhost:0"
    ],
    "env": {}
  },
}

$ claude mcp list
Checking MCP server health...

gopls: gopls serve -mcp.listen=localhost:0 - ✗ Failed to connect

$ claude mcp list --debug
[ERROR] MCP server "gopls" Server stderr: mcp.go:48: Gopls MCP server: starting up on http
[ERROR] MCP server "gopls" Server stderr: mcp.go:73: mcp http server listening
[DEBUG] MCP server "gopls": Connection failed: Error: Connection to MCP server "gopls" timed out after 30000ms
[DEBUG] MCP server "gopls": Error message: Connection to MCP server "gopls" timed out after 30000ms
[DEBUG] MCP server "gopls": Error stack: Error: Connection to MCP server "gopls" timed out after 30000ms
    at Timeout._onTimeout (file:///Users/XXXXXXXX/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:1330:2678)
    at listOnTimeout (node:internal/timers:608:17)
    at process.processTimers (node:internal/timers:543:7)
[ERROR] MCP server "gopls" Connection failed: Connection to MCP server "gopls" timed out after 30000ms
gopls: gopls serve -mcp.listen=localhost:0 - ✗ Failed to connect

		"gopls": {
			"type": "stdio",
			"command": "gopls",
			"args": [
				"mcp"
			]
		}