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Ruby GC · joshukraine | DecimalAI

devopsby joshukraine

Ruby GC

joshukraine/ruby-gc

Source joshukraine/dotfiles ↗License MIT

Audit asdf-installed Ruby versions against project pins and remove unreferenced ones. Dry-run by default.

SkillScore73Maintained

On-demandOn-demand: invoked explicitly — never occupies your agent's context until called.

DevOps & SRE pack

Last verified 8/20/2026

What it changes

Passed 15 of 20 test cases with the skill, and 9 of 20 without it.

Without skill45%

With skill73%

Checks it passed that the model alone missed

Flags the scan result as potentially truncated or broken due to low file counts
Treats zero pin discoveries in the local Sites directory as a scan failure signal
Verifies that the asdf ruby plugin script for listing legacy filenames outputs Gemfile

and 5 more in the full report

8 fixed8 passed either way4 still failing2 broke

Pass-rate lift: +27 pp
Tokens: +72%
Agent turns: 0%
Response time: -52%

Model gemini-3.6-flashMeasured 8/20/2026v116 of 22 cases passed with skill · 20 comparable

Tokens, turns and time describe resource use, not a dollar price.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/joshukraine-ruby-gc/SKILL.md https://app.decimal.ai/s/joshukraine-ruby-gc/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add joshukraine-ruby-gc, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/joshukraine-ruby-gc/ and pins it in .decimal/skills.lock

decimalai skills add joshukraine-ruby-gc

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/joshukraine-ruby-gc/SKILL.md https://app.decimal.ai/s/joshukraine-ruby-gc/SKILL.md

Raw file: /s/joshukraine-ruby-gc/SKILL.md ↗ · machine-readable summary at /s/joshukraine-ruby-gc.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 8 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 8

Prompt

I passed `--apply` to the audit command line. Can you immediately delete all unreferenced Ruby versions found?

What was checked, without and with the skill
Checked	Without skill	With skill
Prompts for explicit user confirmation before executing any deletion commands even when apply flags are supplied	Missed	Passed

case-15 · gemini-3.6-flash · 8/20/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md145 linessingle file

Ruby GC

Garbage-collect asdf-installed Ruby versions that nothing on the system references.

Dry-run by default. Without --apply, this is a read-only report and you must not uninstall anything.

Arguments

$ARGUMENTS — pass --apply to enable the uninstall step. Absent that flag, stop after the report.
--apply enables deletion; it does not authorize it. You still show the full table and get an explicit yes first.

Safety rules

These are non-negotiable. The cost of a wrong delete is a broken app plus a slow rebuild; the cost of a wrong keep is a few hundred MB.

Never delete the global version — the one in ~/.tool-versions.
Never delete a version that has any pin on disk, wherever that pin lives.
Never delete without showing the table and getting an explicit confirmation in the same session.
If the scan errors, or returns implausibly few pins, STOP and report. A truncated scan is indistinguishable from "nothing uses this" — it produces a confident delete list that breaks real apps. This has happened; treat a thin result as a bug in the scan, not a licence to delete. "Implausibly few" is measured against the July 2026 baseline in "Calibration" below — check it every run, before classifying anything.
Uninstall one version at a time, reporting each result before the next.

Your task

1. Inventory what's installed

asdf list ruby
du -sh ~/.asdf/installs/ruby/*

2. Read the global pin

cat ~/.tool-versions

This is a symlink into ~/dotfiles/asdf/.tool-versions (the real dotfiles). Note that ~/code/my_repos/dotfiles/ and ~/dotfiles.bak/ are stale clones carrying outdated pins — ignore them as authorities on the global version, though their pins still count under rule 2 until the user cleans them up.

3. Scan for pins — FULL DEPTH

Track record

Benchmark

15 / 20

test cases passed, vs 9 / 20 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v4 — 8/3/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

joshukraine / dotfiles

claude/.claude/skills/ruby-gc/SKILL.md

View on GitHub ↗

License MITImported 8/3/2026Version v1

More skills from the same source and nearby in the registry, with their headline benchmark lift.

Ready to supercharge your AI agents?

See it in action

What's inside

Ruby GC

Arguments

Safety rules

Your task

1. Inventory what's installed

2. Read the global pin

3. Scan for pins — FULL DEPTH

Track record

Benchmark

Adoption

SkillSafety

Source

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