Add environment variable (env) support for MCP’s stdio transport.

[wangwei1237]

Add environment variable (env) support for MCP’s stdio transport to address dependencies of stdio-based MCP servers on environment variables.

Features

• Feature 1: For stdio-based MCP servers like the GitHub MCP Server, the tools execution relies on the GITHUB_PERSONAL_ACCESS_TOKEN environment variable for authentication. Environment variable support has been added for stdio MCP servers.

Feature Docs

In the mcp.json configuration file, environment variable dependencies for a server can be added under mcpServers.server.env, which is a dictionary variable.

{
  "mcpServers": {
    "github": {
      "type": "stdio",
      "command": "${ROOT_PATH}/github-mcp-server/github-mcp-server",
      "args": [
        "stdio"
      ],
      "env": {
        "GITHUB_PERSONAL_ACCESS_TOKEN": "${github_access_token}"
      }
    }
  }
}

Result

INFO     [browser_use] BrowserUse logging setup complete with level info
INFO     [root] Anonymized telemetry enabled. See https://docs.browser-use.com/development/telemetry for more information.
GitHub MCP Server running on stdio
2025-05-21 11:29:28.547 | INFO     | app.tool.mcp:_initialize_and_list_tools:124 - Connected to server github with tools: ['add_issue_comment', 'create_branch', 'create_issue', 'create_or_update_file', 'create_pull_request', 'create_pull_request_review', 'create_repository', 'fork_repository', 'get_code_scanning_alert', 'get_file_contents', 'get_issue', 'get_issue_comments', 'get_me', 'get_pull_request', 'get_pull_request_comments', 'get_pull_request_files', 'get_pull_request_reviews', 'get_pull_request_status', 'list_code_scanning_alerts', 'list_commits', 'list_issues', 'list_pull_requests', 'merge_pull_request', 'push_files', 'search_code', 'search_issues', 'search_repositories', 'search_users', 'update_issue', 'update_pull_request_branch']
2025-05-21 11:29:28.547 | INFO     | app.agent.manus:initialize_mcp_servers:95 - Connected to MCP server github using command /Users/wangwei17/Documents/Project/github/github-mcp-server/github-mcp-server with arguments ['stdio']

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