computer-health-check - Claude MCP Skill

# Computer Health Check

## What this skill does

Give the user a fast, trustworthy picture of their computer's health and a short list
of actions worth taking — the way a good technician would: look first, explain plainly,
fix only with permission.

It runs entirely through Desktop Commander's local shell, gathers a batch of **read-only**
diagnostics, scores each area, prints a concise summary **in the chat**, and then offers
cleanup suggestions the user can approve one by one.

## The safety contract (read this first)

This is the part that makes users trust the skill, so honor it strictly:

- **Read-only by default.** The collection phase only *observes* (sizes, counts, status).
  It changes nothing.
- **Never use `sudo` or elevation.** DC blocks `sudo`, `shutdown`, `reboot`, `dd`, `mount`,
  `mkfs`, `diskpart`, etc. for good reason. Every check below is designed to work without
  them. If something seems to need elevation, skip it and say so — don't try to work around
  the block.
- **Cleanups are opt-in.** You may *suggest* cleanups freely, but only *execute* one after
  the user explicitly approves that specific action, and only show the exact command first.
- **Prefer reversible, non-destructive actions.** Emptying caches that regenerate, clearing
  a package-manager download cache, or emptying Trash are fine to offer. Deleting user
  documents, uninstalling apps, or editing system files are not — suggest those, let the
  user do them.

## Workflow

### Step 1 — Detect the OS

Determine the platform before doing anything else, because the commands differ.

- Quickest: read Desktop Commander's config (`get_config`) and use the
  `systemInfo.isMacOS` / `isWindows` / `isLinux` booleans (or `platformName`) to
  pick the platform.
- Or run `uname` (macOS/Linux) — if it fails, assume Windows.

Then open the matching reference file and use its command set:

- macOS → [`references/macos.md`](references/macos.md)
- Windows → [`references/windows.md`](references/windows.md)
- Linux → [`references/linux.md`](references/linux.md)

Read **only** the one that matches. Each file contains a single batched collection script
plus interpretation notes and cleanup commands.

### Step 2 — Collect (read-only)

Run the batched collection script from the reference file with `start_process`. Batching
everything into one call is much faster than many small calls and keeps the output tidy.

Guidance:
- Keep outputs bounded (`head`, `Select-Object -First`, etc.) so a long process list or
  file listing doesn't flood the response.
- Skip the genuinely slow / network checks (full OS-update list, internet speed test) on the
  first pass unless the user asked about updates or network. Mention they're available.
- If a single command errors (e.g., a tool isn't installed), continue — partial data is fine.

### Step 3 — Score each area

Rate each category 🟢 Good / 🟡 Watch / 🔴 Act using the rubric below, then compute a simple
overall score. Start at 100 and subtract 8 per 🟡 and 18 per 🔴; floor at 0. Report the
number and a one-word verdict (90+ Excellent, 75–89 Good, 60–74 Fair, <60 Needs attention).

| Area | 🟢 Good | 🟡 Watch | 🔴 Act |
|---|---|---|---|
| Free disk space | >20% free | 10–20% | <10% |
| Disk health (SMART) | Verified / OK / PASSED | — | failing / not supported & errors present |
| Memory pressure | low swap, free pages healthy | noticeable swap/compression | heavy swapping, near-zero free |
| Battery (laptops) | ≥80% max capacity, Normal | 70–80% | <70% or "Service/Replace" |
| Maintenance | uptime <7d, no pending updates | uptime 7–30d or minor updates | uptime >30d or security updates pending |
| Startup load | few third-party login items | moderate | many heavy third-party agents |
| Live resource hogs | nothing >50% at idle | one sustained heavy process | multiple / runaway processes |

Battery is laptop-only — skip it on desktops/VMs. Reclaimable space is reported as an
informational figure, not scored.

### Step 4 — Report in the chat

Use this exact structure. Keep it tight and scannable — this is the deliverable.

```
🖥️  Health Check — <Model>, <OS version>     Score: <N>/100 (<verdict>)

🟢/🟡/🔴  Storage      — <free> free of <total> (<%>). Reclaimable: ~<X> GB
🟢/🟡/🔴  Memory       — <one-line state>
🟢/🟡/🔴  Battery      — <cycles> cycles, <max capacity>%, <condition>
🟢/🟡/🔴  Maintenance  — up <days>d, <updates state>
🟢/🟡/🔴  Startup      — <count> login items (<notable ones>)
🟢/🟡/🔴  Right now    — top: <proc> <cpu%>, <proc> <cpu%>

Top recommendations
1. <highest-impact action> (<expected benefit, e.g. frees ~13 GB>)
2. <next>
3. <next>
```

List at most the 3–5 highest-impact recommendations, ordered by benefit. Don't dump every
finding — the goal is signal, not a wall of text.

### Step 5 — Suggest cleanups, execute only on approval

For each recommendation that maps to a concrete command (see the reference file's "Cleanup"
section), offer it and show the exact command. Then:

- **Safe, reversible** (offer to run on a yes): empty Trash, package-manager cache cleanup
  (`brew cleanup`, `npm cache clean`), clearing a regenerating user cache folder. (On Linux,
  `apt-get clean` / `dnf clean` need root — suggest, don't auto-run.)
- **Needs the user to decide / act** (suggest, don't auto-run): disabling login items,
  installing OS updates (requires restart), uninstalling apps, deleting files in Downloads.
- **Never**: anything requiring sudo/admin, removing system files, disk/partition operations.

When the user approves a safe action, run it, then report what changed (e.g., space freed).
Re-running Step 2's storage check afterward is a nice confirmation.

## Recommendation rules (findings → advice)

These are the high-value mappings; adapt the wording to the platform.

- **Uptime > 30 days** → "Restart your computer — it's been up <N> days. A reboot clears
  memory and applies pending updates." (Highest ROI, lowest effort.)
- **Pending OS/security updates** → platform update step; flag security updates as higher
  priority.
- **Free space < 15%** → lead with the biggest reclaimable buckets you measured.
- **Large Downloads / Caches / Trash** → empty Trash; review largest Downloads items by name;
  clear caches that regenerate.
- **Package manager has many outdated items / big cache** → `upgrade` + cache cleanup.
- **Battery max capacity < 80%** → explain wear is normal; consider a battery service if it's
  affecting runtime.
- **Many third-party startup agents** → name them and suggest disabling the ones the user
  doesn't recognize/need (point to System Settings / Task Manager — don't edit them directly).
- **A process pinned high at idle** → name it and suggest quitting/investigating.

## Notes & pitfalls

- **Don't assume — measure.** Always run the commands and report real numbers. Never
  fabricate sizes, cycle counts, or statuses.
- **Bounded output.** Process and file listings can be huge; always cap them.
- **Optional deep checks** (mention, run on request): internet speed test, full update list,
  per-folder disk scan of the whole home directory, crash-report trend analysis.
- **Privacy.** This reads local system metadata only. Don't send anything off the machine;
  the public-IP check is optional and should be labeled.
- **Cross-platform parity.** The three reference files mirror the same categories so the
  report looks the same regardless of OS.