VS Code配置多MCP服务器遇输入定义错误求助

尝试为VS Code配置多个需令牌/密钥的MCP服务器，按官方文档配置后仅显示单个输入框，配置多个promptString类型输入时，所有输入定义均触发如下错误：

Error starting github: CodeExpectedError: Variable 'github_token' must be defined in an 'inputs' section of the debug or task configuration.

单个输入时可正常运行，配置代码如下：

"mcp": {
    "inputs": [
        {
            "type": "promptString",
            "id": "github_token",
            "description": "GitHub Personal Access Token",
            "password": true
        },
        {
            "type": "promptString",
            "id": "perplexity_api_key",
            "description": "Perplexity API Key",
            "password": true
        },
        {
            "type": "promptString",
            "id": "trello_api_key",
            "description": "Trello API Key",
            "password": true
        },
        {
            "type": "promptString",
            "id": "trello_api_token",
            "description": "Trello API Token",
            "password": true
        }
    ],
    "servers": {
        "Perplexity-ask": {
            "command": "npx",
            "args": ["-y", "@modelcontextprotocol/server-perplexity-ask"],
            "env": {
                "PERPLEXITY_API_KEY": "${input:perplexity_api_key}"
            }
        },
        "Playwright": {
            "command": "npx",
            "args": ["@playwright/mcp@latest"]
        },
        "github": {
            "command": "docker",
            "args": [
                "run",
                "-i",
                "--rm",
                "-e",
                "GITHUB_PERSONAL_ACCESS_TOKEN",
                "ghcr.io/github/github-mcp-server"
            ],
            "env": {
                "GITHUB_PERSONAL_ACCESS_TOKEN": "${input:github_token}"
            }
        },
        "trello": {
            "command": "npx",
            "args": ["-y", "@modelcontextprotocol/server-trello"],
            "env": {
                "TRELLO_API_KEY": "${input:trello_api_key}",
                "TRELLO_TOKEN": "${input:trello_api_token}",
                "TRELLO_BOARD_ID": "xyz"
            }
        }
    }
}

排查方向 #

• 校验JSON语法合法性：用JSON校验工具检查配置是否存在隐性语法错误，比如末尾多余逗号、引号不闭合，这类错误会导致VS Code无法正确解析inputs节点
• 核对输入ID引用一致性：确保服务器env中${input:xxx}的ID和inputs数组中定义的id完全匹配，包括大小写、拼写
• 确认配置层级正确性：验证inputs数组是否直接属于mcp对象的顶级属性（与servers同级），层级错误会导致输入定义不被识别
• 清除VS Code缓存：通过命令面板执行Developer: Reload Window重启窗口，排除旧缓存导致的配置解析异常
• 单独测试服务器配置：逐个启动MCP服务器，排查是否是某个特定服务器的配置干扰了全局输入提示逻辑
• 检查VS Code版本兼容性：确保使用的VS Code版本支持多MCP输入提示，较旧版本可能存在功能兼容问题

内容的提问来源于stack exchange，提问作者Sayan Ghosh