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 event4u-app/agent-config --skill md-language-checkgit clone --depth 1 https://github.com/event4u-app/agent-configWrote 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/event4u-app/agent-config/md-language-check)<a href="https://agentmods.dev/skills/event4u-app/agent-config/md-language-check"><img src="https://agentmods.dev/badge/skills/event4u-app/agent-config/md-language-check/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/event4u-app/agent-config/md-language-check"><img src="https://agentmods.dev/badge/skills/event4u-app/agent-config/md-language-check.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 | $0.00049 | $0.01250 |
| Opus 5 | $0.00024 | $0.00625 |
| Sonnet 5 | $0.00010 | $0.00250 |
| Haiku 4.5 | $0.00005 | $0.00125 |
Grade C, and why
md-language-check scanned grade C with 1 finding 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 8d 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.
Hidden instructionshighPrompt injection
Directives inside HTML comments, invisible characters or bidirectional overrides are read by the model and not by the person reviewing the file.
append `<!-- md-language-check: ignore -->` at the end of that single How it starts
The opening of the file, as written. The whole thing — 139 lines — stays where its author put it; the contents beside it link to each section on GitHub.
md-language-check
When to use
Fire this skill before writing or saving any .md file under:
src/(source of truth — skills, rules, commands, guidelines, templates, contexts)dist/agent-src/(condensed projection).augment/(local agent projection)agents/(project-specific roadmaps, contexts, sessions)
Per language-and-tone § ".md files
are ALWAYS English" and § Detection heuristic, every .md file in those
trees must be English. Bilingual content lives only in labeled
DE: … · EN: … anchor blocks.
Do NOT use when:
- Editing project content outside the trees listed above (READMEs of consumer projects, application docs that follow a different policy)
- Reviewing chat history files (
agents/runtime/.agent-chat-historyis JSONL, not.md) - Inspecting non-
.mdfiles — the checker rejects them with a warning
Procedure
1. Identify the file(s) about to be saved
Collect the absolute or repo-relative path of every .md file the
agent is about to create or modify in this turn. Multiple files in
one turn → pass them all to a single invocation.
2. Run the checker
./scripts-run src/scripts/check_md_language <path> [<path> …] [--format json]
Exit codes:
0→ no German content detected, save proceeds1→ violations found, save is blocked until they are resolved or explicitly suppressed3→ internal error (unreadable file, decode failure)
3. Resolve findings
For every violation:
| Kind | Likely cause | Fix |
|---|---|---|
umlaut |
German prose leaked into body text | Translate the sentence to English |
de_word |
German function word in unquoted prose | Translate; or move into a DE: … · EN: … block if intentional bilingual anchor |
If the line is meta-documentation that must quote German tokens
(e.g. the detection heuristic in language-and-tone.md itself),
append <!-- md-language-check: ignore --> at the end of that single
line — never as a wholesale silencer.
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.
- 8d ago First seen · 139 lines · 49 tokens per session scan C 6dc16a857808
md-language-check is a skill published in the GitHub repository event4u-app/agent-config (10 stars, last pushed today), licensed MIT. It adds 49 tokens to every session and 1,250 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it C with 1 finding (hidden instructions). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-04.
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