OpenMetadata is an open platform that organizes information about data, including its meaning, ownership, quality, history, and relationships. It provides governed context for data users, AI assistants, and agents that need to discover and understand trustworthy data.
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 open-metadata/OpenMetadata --skill java-checkstylegit clone --depth 1 https://github.com/open-metadata/OpenMetadataWrote 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/open-metadata/openmetadata/java-checkstyle)<a href="https://agentmods.dev/skills/open-metadata/openmetadata/java-checkstyle"><img src="https://agentmods.dev/badge/skills/open-metadata/openmetadata/java-checkstyle/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/open-metadata/openmetadata/java-checkstyle"><img src="https://agentmods.dev/badge/skills/open-metadata/openmetadata/java-checkstyle.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 | $0.00060 | $0.00939 |
| Opus 5.5 | $0.00024 | $0.00376 |
| Sonnet 5.5 | $0.00012 | $0.00188 |
| Haiku 4.5 | $0.00006 | $0.00094 |
Grade A, and why
java-checkstyle 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 1mo 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 — 98 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Java Checkstyle / Spotless
OpenMetadata enforces Java formatting via the Spotless Maven plugin. Every CI
build runs mvn spotless:check and fails the PR if any file is not formatted.
This skill keeps the fix on a single, consistent command so reviewers never have
to ask for it manually again.
When to activate
- The user asks to "fix checkstyle", "fix Java formatting", "apply spotless", "run spotless", "format Java", or similar.
- CI posts a
Java checkstyle failed/Fix Java checkstylecomment on a PR (the project's bot phrases the instruction as "Please runmvn spotless:applyin the root of your repository and commit the changes to this PR"). - After you have finished authoring or editing any
.javafiles — before opening a PR or pushing a commit that touches Java.
Arguments
- No arguments: run
mvn spotless:applyat the repo root across all modules. -pl <module>: scope to a single Maven module (e.g.-pl openmetadata-service). Useful when only one module changed and you want a faster run.--check: runmvn spotless:checkinstead ofapply. Use to confirm the tree is clean without touching files (e.g. to verify before push).
Process
Step 1: Run Spotless
From the repo root:
mvn spotless:apply # default — formats everything
# or
mvn -pl <module> spotless:apply # scoped to one module
# or
mvn spotless:check # verify only, don't write
Spotless is fast (seconds, no compilation). If it fails with a plugin error (not a formatting diff), surface the error and stop — do not try to hand-edit formatting around the failure.
Step 2: Check what changed
git status --short
git diff --stat
Expect reformatting in .java files only. If Spotless touches pom.xml or
other non-Java files, that's also fine — Spotless is configured for those too
in this repo.
Step 3: Commit
Do not fold the reformat into an unrelated commit. If the user asked you to
commit, follow their preference (fold into the in-progress commit, or make a
separate one). Otherwise, when you are confident the change is a purely
mechanical formatting reformat, you may commit it on its own as a
Fix Java checkstyle commit — this matches the repo's existing history for
bot-triggered formatting-only commits. If you are unsure whether the diff is
purely mechanical, do NOT auto-commit: surface the changed-file list and let the
user decide.
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.
- 1mo ago First seen · 98 lines · 60 tokens per session scan A 59f6556b2062
java-checkstyle is a skill published in the GitHub repository open-metadata/OpenMetadata (15,490 stars, last pushed today), licensed Apache-2.0. It adds 60 tokens to every session and 939 once invoked, about $0.0002 per session on Opus 5.5. 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 2026-08-30.
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