claude

metrognome

The autonomous performance engineer for React Native — one propose -> measure -> keep/revert loop over metro-mcp and Callstack's RN AI tooling, with a 3D Perf Map and a per-repo performance memory.

23 on GitHubby Xavierv0.2.7MITupdated 30 days agoperformance
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Plugin metrognome from marketplace metrognome in uphold/metrognome. Commands read from the repo's manifest — 30 days ago.

This plugin runs code on your machine — its hooks fire automatically on events like tool use and it starts local MCP servers. The exact commands are listed below; read them before installing.

What it installs

Skills (1)

  • metrognome

    Autonomous, scientific React Native & Expo performance optimization via a propose -> measure -> keep/revert loop. Use this WHENEVER an RN/Expo app is slow, laggy, janky, stuttering, freezing, or memory-hungry — slow cold start / TTI, dropped frames while scrolling a FlatList/SectionList/FlashList, r

Slash commands (1)

  • /metrognome:metrognome

    The autonomous performance engineer for React Native. Open the metrognome menu (Autoresearch / Perf Map 3D / Doctor), or pass a preset/target/natural-language goal to skip straight to work.

MCP servers (1)

  • metro-mcp

    runs: sh -c B="${CLAUDE_PLUGIN_ROOT}/node_modules/metro-mcp/dist/bin/metro-mcp.js"; [ -f "${CLAUDE_PLUGIN_ROOT}/node_modules/.metrognome-installed" ] && [ -f "$B" ] && exec node "$B" || exec npx -y metro-mc

Hooks (4)

  • SessionStart

    R="${CLAUDE_PLUGIN_ROOT}"; M="$R/node_modules/.metrognome-installed"; L="$(cksum < "$R/package.json")"; [ "$(cat "$M" 2>/dev/null)" = "$L" ] || { npm --prefix "$R" install --omit=dev --quiet 2>/dev/nu

  • SessionStart

    sh "${CLAUDE_PLUGIN_ROOT}/hooks/update-clis.sh"

  • SessionStart

    node "${CLAUDE_PLUGIN_ROOT}/skills/metrognome/scripts/metro_heal.mjs" --hook 2>/dev/null || true

  • UserPromptSubmit

    input=$(cat); [ -d .metrognome ] && printf '%s' "$input" | grep -qiE 'performance|\bjank|\bfps\b|frame.?rate|re-?render|memory leak|\bRAM\b|bundle size|cold start|\bTTI\b|\bslow\b|optimi[sz]e|profil(e

View source on GitHub uphold.github.io

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