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 skills/moonrunnerkc/skillcheck/unknown-fieldsnpx skills add moonrunnerkc/skillcheck --skill unknown-fieldsgit clone --depth 1 https://github.com/moonrunnerkc/skillcheckWhat 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 | $0.00016 | $0.00049 |
| Opus 5 | $0.00008 | $0.00024 |
| Sonnet 5 | $0.00003 | $0.00010 |
| Haiku 4.5 | $0.00002 | $0.00005 |
Grade A, and why
unknown-fields 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.
What it actually says
Body content that keeps the file above the trivial threshold.
What ships with it
1 file 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.
- 2d ago First seen · 10 lines · 16 tokens per session scan A 56ac1c003b36
unknown-fields is a skill published in the GitHub repository moonrunnerkc/skillcheck (24 stars, last pushed 10d ago), licensed MIT. It adds 16 tokens to every session and 49 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 2026-08-30.
Other skills, from other repositories
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pr-watch-fix
Watch the GitHub PR for the current branch, wait for CI to finish, and autonomously fix failing jobs by reading logs, editing sources, and pushing. Stops cleanly when stuck.
prepare-release
Prepare a MegaLinter release — update CHANGELOG (prune empty sections, collapse linter versions, backfill PR numbers), run the release build, push commit and tag, and guide GitHub release creation.
megalinter-setup
Install or upgrade MegaLinter on a repository. Use when the user wants to add MegaLinter to a project, set up linting CI, update MegaLinter configuration or version, or says "install megalinter", "setup linting", "add code quality checks", "update megalinter skills". Always goes through npx mega-linter-runner…
datadog-dashboards
Manage Datadog dashboards including listing, viewing, creating, updating, and deleting dashboards with their widgets and configurations. Official Datadog content, vendored from https://github.com/DataDog/datadog-api-claude-plugin (agents/dashboards.md), Apache-2.0.
add-linter
Guided workflow for adding a new linter to MegaLinter. Use when a contributor needs to add support for a new linting tool.