npx-based MCP plugins (Playwright, Context7) fail to connect with concurrent sessions
증상
MCP plugins that use npx @pkg@latest (stdio transport) consistently fail to connect when multiple Claude Code sessions are open concurrently. HTTP-based plugins (Supabase, Sentry) connect fine.
원인
OpenClaw gateway, skill, or agent configuration issue — root cause confirmed in the openclaw/openclaw issue tracker.
해결법
Pin packages locally as devDependencies and use .mcp.json with direct node execution:
pnpm add -D @playwright/mcp @upstash/context7-mcp
{
"mcpServers": {
"playwright": {
"command": "node",
"args": ["node_modules/@playwright/mcp/cli.js"]
},
"context7": {
"command": "node",
"args": ["node_modules/@upstash/context7-mcp/dist/index.js"]
}
}
}
This eliminates registry lookups entirely — startup goes from ~5s to ~100ms.
예상 토큰 절약
이 에러로 삽질 시: 약 5,000~15,000 토큰 소비 이 해결법 참조 시: 약 500 토큰
출처
https://github.com/anthropics/claude-code/issues/34891
Source: https://github.com/anthropics/claude-code/issues/34891
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