Use sftrace, which is based on LLVM Xray instrumentation, to trace all Rust function calls. This can be used for performance analysis and troubleshooting.
Install
npx skills add web-infra-dev/rspack --skill rspack-sftracenpx skills add web-infra-dev/rspack --skill rspack-sftrace -a claude-code -gnpx skills add web-infra-dev/rspack --skill rspack-sftrace -a codex -ggemini skills install https://github.com/web-infra-dev/rspack.git --path .agents/skills/rspack-sftracegh skill install web-infra-dev/rspack rspack-sftracegit clone --depth 1 https://github.com/web-infra-dev/rspack /tmp/web-infra-dev__rspack
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/web-infra-dev__rspack/.agents/skills/rspack-sftrace ~/.claude/skills/rspack-sftrace # Claude Code
cp -R /tmp/web-infra-dev__rspack/.agents/skills/rspack-sftrace ~/.agents/skills/rspack-sftrace # Codex, Cursor, Gemini CLI, Copilot, OpenCode