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Interactive system resource analysis and troubleshooting for memory, disk, CPU, and performance issues
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Based on SOC occupation classification
| name | tools-diagnostics |
| description | Interactive system resource analysis and troubleshooting for memory, disk, CPU, and performance issues |
Interactive skill for diagnosing system resource issues. Detects OS and applies appropriate diagnostic patterns. Focuses on real-world lessons from production incidents rather than generic command documentation.
Expects a Unix-like system (Linux or macOS). User describes a resource problem (memory, disk, CPU, or general slowness).
uname -s (Linux or Darwin)sudo for accurate disk usage on Linux (non-root du under-reports)nix.gc.automatic is disabled by policy - use explicit nix-collect-garbage -d/var/lib/containers, rootless storage) as disk pressure sourceAssess state:
df -h / /nix # disk usage
du -sh ~/.Trash ~/.cache ~/Library/Caches /nix/store 2>/dev/null # top consumers
Safe cleanup (macOS):
rm -rf ~/.Trash/*
rm -rf ~/Library/Caches/*
uv cache clean && brew cleanup --prune=all
nix-collect-garbage -d
Safe cleanup (Linux, as root):
sudo du -xhd 1 / | sort -hr | head -20 # find top consumers
sudo nix-collect-garbage -d
sudo nix-store --gc
sudo podman system prune --volumes -f # if containers present
When determinateNix.enable = true on macOS hosts, nix-darwin's nix.gc module is disabled. Determinate Nixd handles GC policy instead. Do not assume timer-based GC is running.
Reference: dragonix/modules/base/nix-settings/darwin.nix
Large Nix store after GC usually means:
~/.local/state/nix/profiles//proc roots# Per-user profile pruning
nix-env -p ~/.local/state/nix/profiles/profile --delete-generations old
nix-env -p ~/.local/state/nix/profiles/home-manager --delete-generations old
Low risk, high value: trash, caches, uv cache clean, brew cleanup
Medium risk with verification: nix-collect-garbage -d, playwright cache, mediaanalysisd
Do not delete: /System, /usr, /bin, /sbin, APFS system volumes, app databases
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