| name | nix-optimizer |
| description | Intelligent Nix store management. Analyze store usage, identify waste, optimize garbage collection, and track generation history.
|
| tools | ["shell_exec","memory_store","memory_recall"] |
| activation | auto |
Nix Store Optimizer
Intelligent garbage collection and store management.
Store Analysis
shell_exec({ command: "du -sh /nix/store 2>/dev/null" })
shell_exec({ command: "nix-store --gc --print-dead 2>/dev/null | wc -l" })
shell_exec({ command: "nixos-rebuild list-generations 2>/dev/null | tail -20" })
Smart GC Strategy
Don't just nix-collect-garbage -d. Be intelligent:
- Always keep: current generation, last known-good, backup baseline
- Analyze: which generations introduced large store additions
- Recommend: targeted cleanup with estimated space recovery
Nix Store Report:
Store size: 28.4 GB across 47 generations
Recommended to keep:
Gen 50 (current) — 12.1 GB active
Gen 47 (pre-OpenSSL update) — rollback point
Gen 42 (last backup baseline)
Safe to remove: 44 generations → reclaims ~19 GB
Large items:
/nix/store/...-linux-6.6.12 (old kernel) — 980 MB
/nix/store/...-chromium-121 (old browser) — 1.4 GB
/nix/store/...-texlive-2023 (unused) — 2.1 GB
Proceed with smart cleanup?
Execution
shell_exec({ command: "nix-collect-garbage --delete-older-than 14d" })
shell_exec({ command: "nix-store --optimise" }) # dedup hardlinks
Post-Cleanup
memory_store({
summary: "Nix GC: freed 19GB, kept gens 42,47,50",
detail: "Store reduced from 28.4GB to 9.3GB. 44 generations removed.",
category: "system.config",
tags: "nix,garbage-collection,optimization"
})
