When running tests locally, process.env.RUNNER_TEMP is undefined, causing the code to literally create "undefined/claude-prompts/" directories in the working directory. Added fallback to "/tmp" following the pattern already used in src/mcp/github-actions-server.ts. 🤖 Generated with [Claude Code](https://claude.ai/code) Co-authored-by: Claude <noreply@anthropic.com>