Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/ArabelaTso/Skills-4-SEnpx agentmods add skills/arabelatso/skills-4-se/multi-version-behavior-comparatorWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/arabelatso/skills-4-se/multi-version-behavior-comparator)<a href="https://agentmods.dev/skills/arabelatso/skills-4-se/multi-version-behavior-comparator"><img src="https://agentmods.dev/badge/skills/arabelatso/skills-4-se/multi-version-behavior-comparator/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/arabelatso/skills-4-se/multi-version-behavior-comparator"><img src="https://agentmods.dev/badge/skills/arabelatso/skills-4-se/multi-version-behavior-comparator.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
What 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 5.1 | $0.00098 | $0.00446 |
| Opus 5 | $0.00049 | $0.00223 |
| Sonnet 5 | $0.00020 | $0.00089 |
| Haiku 4.5 | $0.00010 | $0.00045 |
Grade A, and why
multi-version-behavior-comparator 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 6d 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.
What it actually says
Multi-Version Behavior Comparator
Overview
This skill compares behavior across multiple versions of programs, identifying functional changes, regressions, and behavioral divergences to guide safe upgrades and validation.
Quick Start
# Compare two versions
python scripts/compare.py v1.0/ v2.0/
# Compare multiple versions with test suite
python scripts/compare.py v1.0/ v2.0/ v3.0/ --tests tests/
# Generate detailed report
python scripts/compare.py old/ new/ --output report.json
What Gets Compared
- Functionality - Added, removed, or modified features
- Outputs - Return values, printed output, file changes
- Exceptions - Error handling and exception types
- Test Results - Pass/fail status across versions
- Observable States - Side effects, state changes
Comparison Report
Generates JSON report with:
- Behavioral Divergences: Where versions behave differently
- Potential Regressions: Functionality that may have broken
- Added Features: New functionality in newer versions
- Removed Features: Functionality no longer present
- Validation Areas: Code requiring manual review
Usage
python scripts/compare.py <version1> <version2> [version3...] [--tests <test_dir>] [--output <report.json>]
Tips
- Run before deploying new versions
- Use with existing test suites for comprehensive comparison
- Review regressions carefully before upgrading
- Validate high-risk areas identified in report
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.
- 6d ago First seen · 54 lines · 98 tokens per session scan A 7439d0b84a7c
multi-version-behavior-comparator is a skill published in the GitHub repository ArabelaTso/Skills-4-SE (251 stars, last pushed 19d ago), licensed Apache-2.0. It adds 98 tokens to every session and 446 once invoked, about $0.0005 per session on Opus 5. 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 2026-09-03.
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