What is check-version-exists?

A checker for whether one exact version of a Maven library has been published in a repository.

Use it to confirm a group, artifact, and version coordinate, and to see which repository provided the answer.

It helps distinguish an unavailable version from a valid one before you change a build file.

check-version-exists — Skill for Claude Code by kirich1409

Install

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.

Any agent

npx skills add kirich1409/krozov-ai-tools --skill check-version-exists

Clone the repo

git clone --depth 1 https://github.com/kirich1409/krozov-ai-tools

Made for: Claude Code.

Or install maven-mcp, the plugin that ships this one along with the rest of its 21 skills, 2 hooks.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/kirich1409/krozov-ai-tools/check-version-exists/github.svg)](https://agentmods.dev/skills/kirich1409/krozov-ai-tools/check-version-exists)

Your own site

<a href="https://agentmods.dev/skills/kirich1409/krozov-ai-tools/check-version-exists"><img src="https://agentmods.dev/badge/skills/kirich1409/krozov-ai-tools/check-version-exists/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/kirich1409/krozov-ai-tools/check-version-exists"><img src="https://agentmods.dev/badge/skills/kirich1409/krozov-ai-tools/check-version-exists.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 87 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 512 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits

NVIDIA SkillSpector pass 7 Sept 2026

How audits are shown

Origin original No closer match found in the catalogue.

Token cost

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	$0.00087	$0.00512
Opus 5	$0.00044	$0.00256
Sonnet 5	$0.00017	$0.00102
Haiku 4.5	$0.00009	$0.00051

Measured 10d ago against content hash d82f32a39539, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

check-version-exists 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 10d 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.

plugins/maven-mcp/plugin/skills/check-version-exists/SKILL.md · 51 lines

What it actually says

Check Version Exists

Confirm whether one specific, already-known version of a Maven artifact exists in any resolvable repository.

Steps

Parse groupId, artifactId, version from the user's input (e.g. com.squareup.okhttp3:okhttp:4.12.0, or a groupId:artifactId plus a version mentioned in conversation).
Call check_version_exists with:
- groupId, artifactId, version
- optional projectPath when the user is inside a project (uses declared repos)
Present the result:
- exists: true — show stability and repository (which repo answered), and relocatedTo when present (the artifact was relocated via a Maven <distributionManagement> POM — tell the user the new coordinates).
- exists: false — tell the user the version was not found in any resolvable repository. Do not guess a reason; offer /latest-version to check what is available, or /search-artifacts if the artifact name itself may be wrong.

Error handling

Tool error / not found → report as-is, do not invent a version or existence status from memory.

Constraints and non-goals

Not for "what's the latest version of X" — use /latest-version.
Not for "is my current version behind latest" — use /compare-dependency-versions.
Not for checking many artifacts at once — use /check-multiple-versions.

Fallback (MCP unavailable only)

Fetch maven-metadata.xml from public repos (Maven Central → Google Maven → Gradle Plugin Portal) and check whether version is present in the <versions> list. Note that this skips project-declared private repos and relocation detection.

Changes

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.

10d ago First seen · 51 lines · 87 tokens per session scan A d82f32a39539

Subscribe to this mod's changes

check-version-exists is a skill published in the GitHub repository kirich1409/krozov-ai-tools (22 stars, last pushed 5d ago), licensed MIT. It adds 87 tokens to every session and 512 once invoked, about $0.0004 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 2026-09-01.

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