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/alexmond/jhelm/precommitnpx skills add alexmond/jhelm --skill precommitgit clone --depth 1 https://github.com/alexmond/jhelmWhat 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 | $0.00019 | $0.00411 |
| Opus 5 | $0.00010 | $0.00205 |
| Sonnet 5 | $0.00004 | $0.00082 |
| Haiku 4.5 | $0.00002 | $0.00041 |
Grade A, and why
precommit 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 yesterday.
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
Pre-commit Check: Format → Validate → Test
Run this before every commit to catch format and checkstyle issues early.
$ARGUMENTS is an optional module name (e.g. jhelm-core). If omitted, runs against all modules.
Step 1: Auto-format
Single module:
./mvnw spring-javaformat:apply -pl $ARGUMENTS
All modules:
./mvnw spring-javaformat:apply
Step 2: Validate (checkstyle)
Single module:
./mvnw validate -pl $ARGUMENTS 2>&1 | grep -E "^\[ERROR\]|violations"
All modules:
./mvnw validate 2>&1 | grep -E "^\[ERROR\]|violations"
If violations remain after auto-format, invoke the /checkstyle skill to fix them manually. Do not proceed to Step 3 until validate passes cleanly.
Step 3: Run tests
Single module:
./mvnw test -pl $ARGUMENTS 2>&1 | tail -20
All modules (full build):
./mvnw install 2>&1 | tail -20
Outcome
Report a summary:
| Step | Result |
|---|---|
| Format | Applied / Already clean |
| Checkstyle | 0 violations / N violations (list them) |
| Tests | X passed, 0 failures / list failures |
If everything is green, the working tree is ready to commit. If anything fails, fix it before committing.
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.
- yesterday First seen · 72 lines · 19 tokens per session scan A 932125491236
precommit is a skill published in the GitHub repository alexmond/jhelm (4 stars, last pushed 8d ago), licensed Apache-2.0. It adds 19 tokens to every session and 411 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 2026-08-31.
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