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 skills add matteocervelli/llms --skill version-checkergit clone --depth 1 https://github.com/matteocervelli/llmsWrote 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/matteocervelli/llms/version-checker)<a href="https://agentmods.dev/skills/matteocervelli/llms/version-checker"><img src="https://agentmods.dev/badge/skills/matteocervelli/llms/version-checker/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/matteocervelli/llms/version-checker"><img src="https://agentmods.dev/badge/skills/matteocervelli/llms/version-checker.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00016 | $0.03179 |
| Opus 5 | $0.00008 | $0.01589 |
| Sonnet 5 | $0.00003 | $0.00636 |
| Haiku 4.5 | $0.00002 | $0.00318 |
Grade A, and why
version-checker 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 5d 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 — 495 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Version Checker Skill
Purpose
The Version Checker skill provides version compatibility analysis, breaking change detection, and security vulnerability scanning for Python dependencies. It validates version specifiers, checks for breaking changes between versions, and identifies security vulnerabilities in dependency versions.
Key Functions:
- Parse and validate version specifiers (>=, ~=, ^, ==, etc.)
- Check compatibility across Python versions
- Detect breaking changes between package versions
- Scan for security vulnerabilities
- Recommend upgrade paths
- Generate version compatibility reports
When to Use
Use this skill when you need to:
- Validate version specifiers in dependency declarations
- Check if new dependency versions are compatible with Python 3.11+
- Detect breaking changes when upgrading dependencies
- Scan dependencies for security vulnerabilities
- Plan dependency upgrade strategies
- Resolve version conflicts
Typical Scenarios:
- Phase 2 design (version compatibility for PRP)
- Dependency upgrade planning
- Security vulnerability assessment
- Version conflict resolution
- Compatibility verification before installation
Workflow
1. Parse Version Specifiers
Action: Extract and validate version specifiers from dependency declarations
Version Specifier Types:
==1.2.3- Exact version match>=1.0.0- Minimum version (inclusive)>1.0.0- Minimum version (exclusive)<=2.0.0- Maximum version (inclusive)<2.0.0- Maximum version (exclusive)~=1.2.0- Compatible release (>=1.2.0, <2.0.0)>=1.0,<2.0- Range specifier!=1.3.0- Exclude specific version
Example:
# Validate version specifiers
echo "httpx>=0.27.0" | grep -E '^[a-zA-Z0-9_-]+[><=~!].*'
Output: Valid/invalid version specifier
2. Check Python Version Compatibility
Action: Verify dependency compatibility with target Python version (3.11+)
Process:
- Read package metadata from PyPI
- Check
python_requiresfield - Verify compatibility with Python 3.11+
- Report incompatibilities
What ships with it
2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 5d ago First seen · 495 lines · 16 tokens per session scan A dbf8015f4573
version-checker is a skill published in the GitHub repository matteocervelli/llms (25 stars, last pushed 3mo ago), licensed MIT. It adds 16 tokens to every session and 3,179 once invoked, about $0.0001 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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