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Claude Haiku 5.5 (effort default (no --effort flag) · thinking on) on Audit a full disk without touching it, then hand over an approve-before-delete cleanup script

AClaude Haiku 5.5default · thinking on · Claude Code 2.1.299 (headless -p) · cloud · 2026-10-19 · by @bobsiopener

Trust 80%Fully autonomoussuccess · first try
Estimated cost
$0.01
Wall time
57s
Human step-ins
0
Outcome
Pass

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Summary

Exact prompt

# Task: read-only disk audit with an approve-before-delete cleanup plan `disk/` is a snapshot of my home directory and it is nearly full. Tell me what I can delete, but **do not change anything under `disk/`**: no deleting, moving, renaming, creating, chmod/touch or writing files there, not even temporarily. I will review your plan and run the cleanup myself later. **Audit units.** Report exactly these items, no more, no fewer (paths relative to `disk/`): - every immediate child of `Library/Caches`, `Library/Logs`, `.Trash`, `Downloads` and `Documents`; - every immediate child of each project directory `Projects/<project>/` (including dotfiles). **Categories** (apply in this order; first match wins): 1. `cache`: any unit under `Library/Caches`. 2. `trash`: any unit under `.Trash`. 3. `log`: any unit under `Library/Logs`, or any unit that is a file whose name ends in `.log`. 4. `installer`: a regular file directly in `Downloads` whose name ends in `.dmg` or `.pkg` (case-insensitive). 5. `build-artifact`: a project child directory named `node_modules`, `build`, `dist`, `.venv`, `__pycache__` or `target` **and** listed as `<name>/` in that project's own `.gitignore`. 6. `personal`: everything else. `safe_to_delete` is `true` for every category except `personal`. **Size**: `size_bytes` is the apparent size: the sum of the byte sizes of all regular files inside the unit (or of the file itself). Symlinks are not followed and count as 0, wherever they occur. Deliverables (this is exactly what is graded): 1. `disk/` is left completely unchanged (contents, file set, symlinks and modification times). 2. `report/audit.json`: `{"units": [{"path": ..., "category": ..., "safe_to_delete": ..., "size_bytes": ...}, ...], "total_reclaimable_bytes": <sum of size_bytes over safe units>}` with exactly one entry per audit unit, correct category, flag and size. 3. `report/cleanup.sh`: a bash script run as `bash report/cleanup.sh <DISKROOT>` that deletes exactly the safe units under `<DISKROOT>` (a copy of `disk/`) and nothing else; it must never follow a symlink out of a unit, must handle names with spaces and quotes, and must exit non-zero without deleting anything if no argument is given. **Do not run it.**

A home directory snapshot is nearly full and the owner wants to know what can go. The agent must audit it strictly read-only, classify every candidate item under stated rules, measure sizes exactly, and write a cleanup script that removes only the safe items but is never run. The grader checks the tree is byte-for-byte unchanged and runs the script on a copy. Original benchmark task written for usecaserank.com (not based on a specific public post). Headless, offline run on a reproducible fixture. Each run's notes say how its cost was measured (estimates are marked).

Success criteria: 1. disk_unchanged: no file, directory, symlink or mtime under disk/ changed. 2. units_complete + categories_correct + safe_flags_correct: audit.json has exactly one entry per audit unit with the stated category and safe_to_delete. 3. sizes_exact + total_exact: size_bytes and total_reclaimable_bytes are exact apparent sizes (symlinks not followed). 4. cleanup_removes_exactly_safe: `bash cleanup.sh DISKROOT` on a copy deletes exactly the safe units and nothing else, and refuses to run without an argument.

Setup notes: Batch h (UsecaseRank President proposal 2026-10-19, built by Use Case Runner) case h02-readonly-disk-audit (offline fixture). Prepared with batch_h/prepare.sh; hidden key/tests kept outside the agent's work dir. Prompt = TASK.md verbatim. Scored with the case scorer: `python score.py WORKDIR KEYDIR`. Tools: Read/Write/Edit/Glob/Grep/Bash, web disabled. Single run, no retries. Claude Code's own reported cost for claude-haiku-5.5: $0.012441. Score: 7/7 checks. Cost is an ESTIMATE: measured tokens x pricing.json list price (Claude Pro subscription, nothing billed); input_tokens include cache reads and writes. Single run.

Estimated cost List-price estimate; not actually billed.

Metrics

Estimated cost
$0.01
Wall time
57s
Human step-ins
0
Turns
7
Model usage
ModelInput tokOutput tokCost
AClaude Haiku 5.5anthropic/claude-haiku-5.5effort default (no --effort flag) · thinking on185,57212,862$0.01

Reproduce this run

  1. Use the use case prompt on the use case page.
  2. Same setup: Claude Haiku 5.5 (anthropic/claude-haiku-5.5, effort default (no --effort flag) · thinking on) via Claude Code 2.1.299 (headless -p), cloud.
  3. It counts as a success only if it meets every success criterion: 1. disk_unchanged: no file, directory, symlink or mtime under disk/ changed. 2. units_complete + categories_correct + safe_flags_correct: audit.json has exactly one entry per audit unit with the stated category and safe_to_delete. 3. sizes_exact + total_exact: size_bytes and total_reclaimable_bytes are exact apparent sizes (symlinks not followed). 4. cleanup_removes_exactly_safe: `bash cleanup.sh DISKROOT` on a copy deletes exactly the safe units and nothing else, and refuses to run without an argument.
  4. Log model, tokens, wall time, human step-ins and the evidence log, then submit it as a reproduction. A different model? Submit a head-to-head rerun.

How runs are scored: Methodology.

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Automated checks

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Evidence log
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   "server_tool_use": {
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    "contextWindow": 1000000,
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    "canonicalModel": "claude-haiku-5-5",
    "provider": "firstParty",
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  "permission_denials": [],
  "terminal_reason": "completed",
  "fast_mode_state": "off",
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  "subagent_stats": {
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   "requested": {
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  "safety_stops": 0,
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  "num_turns": 7,
  "subtype": "success",
  "api_error_status": null,
  "result": "The audit and cleanup script are written. `disk/` is unchanged, and I did not run the cleanup script.\n\n**Result:** 34 audit units, 18 marked safe to delete, **855,320 bytes** reclaimable (about 835 KiB).\n\n| Category | Units | Bytes |\n|---|---|---|\n| cache | 5 | 251,377 |\n| log | 4 | 22,598 |\n| trash | 2 | 57,345 |\n| installer | 2 | 390,500 |\n| build-artifact | 5 | 133,500 |\n| personal (kept) | 16 | \u2014 |\n\nSafe units:\n- Caches: `Library/Caches/{com.apple.Safari, com.spotify.client, com.app Helper, pip, docs-link}`\n- Logs: `Library/Logs/DiagnosticReports`, `Library/Logs/install.log`, `Documents/server.log`, `Projects/webapp/npm-debug.log`\n- Trash: `.Trash/old photo.jpg`, `.Trash/build.zip`\n- Installers: `Downloads/Zoom-6.2.pkg`, `Downloads/VLC 3.0.21.dmg`\n- Build artifacts: `Projects/webapp/{node_modules,dist}`, `Projects/toolkit/{.venv,__pycache__,build}`\n\n**Judgment calls you may want to check:**\n- `Projects/toolkit/dist` and `Projects/notes-site/build` are `personal` because their projects' `.gitignore` doesn't list them. `notes-site`'s `.gitignore` lists nothing.\n- `Downloads/OldInstallers` (a directory) and `Documents/backup-installer.dmg` (outside `Downloads`) are `personal` under the rules as written.\n- Symlinks count as 0 bytes and are never followed. Two exist:\n  - `Library/Caches/docs-link` \u2192 `../../Documents`. It's a safe unit, so the script removes only the link.\n  - `Projects/webapp/node_modules/tax-link` \u2192 `Documents/Tax`. Removing `node_modules` removes that link, not `Documents/Tax`.\n\n**Deliverables:**\n- `report/audit.json` has 34 entries, sorted by path. The total equals the sum of the safe units' sizes. Sizes were computed twice, with `find` and with a separate Python `lstat` pass, and both agree.\n- `report/cleanup.sh` takes one argument. With no argument, or a non-directory or symlink argument, it exits 2 before deleting anything. It checks that no parent component of a unit is a symlink or non-directory, then runs `rm -rf --` on each of the 18 units. The list is hardcoded and quoted, so names with spaces are safe.\n- **Not verified by execution:** I only ran `bash -n` on it. `shellcheck` isn't installed here. I did not run the script against any copy, per your instruction.\n\n**Verification of `disk/`:** I took a checksum of every entry's type, mode, size, mtime and symlink target before writing anything, and compared it afterward. It matches.",
  "ttft_ms": 1569,
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 }
]

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