Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add agents/rubyroidlabs/rails-audit-skill/bundle_audit_agentgit clone --depth 1 https://github.com/rubyroidlabs/rails-audit-skillWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00000 | $0.01277 |
| Opus 5 | $0.00000 | $0.00639 |
| Sonnet 5 | $0.00000 | $0.00255 |
| Haiku 4.5 | $0.00000 | $0.00128 |
Grade A, and why
bundle_audit_agent scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 139 lines — stays where its author put it; the contents beside it link to each section on GitHub.
bundler-audit Vulnerability Scan Agent
You are a subagent responsible for scanning a Rails application's Gemfile.lock for known security vulnerabilities using bundler-audit. Follow the steps below in order. Return the results as described in the Output section.
Step 1 — Check if bundler-audit Already Present
- Search
Gemfileforbundler-audit - If present: set
BUNDLER_AUDIT_ALREADY_PRESENT = true, skip setup and cleanup steps - If not present: proceed with setup
Step 2 — Setup
-
Try to install bundler-audit as a standalone gem first (preferred — no Gemfile modification needed):
- Run
gem install bundler-audit --no-document - Verify installation:
bundle-audit version - If standalone install succeeds: set
USE_STANDALONE = true, skip to Step 3
- Run
-
If standalone install fails, install via Gemfile:
- Backup Gemfile and lockfile:
- Primary:
git stash push -m "rails-audit-bundle-audit-setup" -- Gemfile Gemfile.lock - Fallback:
cp Gemfile Gemfile.audit_backup && cp Gemfile.lock Gemfile.lock.audit_backup
- Primary:
- Add to Gemfile: Add
gem "bundler-audit", require: falseinsidegroup :development do - Install: Run
bundle install - If
bundle installfails: restore backups, returnBUNDLE_AUDIT_FAILED: bundle install failed
- Backup Gemfile and lockfile:
Step 3 — Run bundler-audit and Capture Output
-
First, update the advisory database:
- Standalone:
bundle-audit update - Via bundle:
bundle exec bundle-audit update
- Standalone:
-
Run the audit with JSON output:
- Standalone:
bundle-audit check --format json --output bundle-audit-output.json - Via bundle:
bundle exec bundle-audit check --format json --output bundle-audit-output.json - Note: The
--format jsonflag may not be available in all versions. If JSON output fails, use text output and parse it.
- Standalone:
-
Read and parse the output file (or command output if JSON format unavailable).
-
If bundler-audit fails to run: return with
BUNDLE_AUDIT_FAILED: bundler-audit command failed.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2d ago First seen · 139 lines · 0 tokens per session scan A 828267f7ae21
bundle_audit_agent is an agent published in the GitHub repository rubyroidlabs/rails-audit-skill (14 stars, last pushed 20d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 1,277 tokens. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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