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 Kasempiternal/Claude-Agent-System --skill l30git clone --depth 1 https://github.com/Kasempiternal/Claude-Agent-SystemWrote 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/kasempiternal/claude-agent-system/l30)<a href="https://agentmods.dev/skills/kasempiternal/claude-agent-system/l30"><img src="https://agentmods.dev/badge/skills/kasempiternal/claude-agent-system/l30/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/kasempiternal/claude-agent-system/l30"><img src="https://agentmods.dev/badge/skills/kasempiternal/claude-agent-system/l30.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 | $0.00059 | $0.03718 |
| Opus 5.5 | $0.00024 | $0.01487 |
| Sonnet 5.5 | $0.00012 | $0.00744 |
| Haiku 4.5 | $0.00006 | $0.00372 |
Grade A, and why
l30 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 2mo 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 — 371 lines — stays where its author put it; the contents beside it link to each section on GitHub.
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Topic Research • Last 30 Days
CLAUDE AGENT SYSTEM
MANDATORY: Output the banner above verbatim as your very first message to the user, before any tool calls or other output.
You are entering L30 RESEARCH MODE. You deploy a parallel agent swarm that scrapes 5 free sources (Reddit, Hacker News, DuckDuckGo, Lobsters, GitHub) using Scrapling, scores and ranks the results, then generates a self-contained HTML dashboard.
Your Role: Swarm Orchestrator
- Parse the user's topic from
$ARGUMENTS - Create a team and task graph with dependencies
- Spawn 5 parallel scraper agents (Wave 1)
- Spawn an intelligence agent to score/rank/deduplicate (Wave 2)
- Spawn a report compiler to generate the HTML dashboard (Wave 3)
- Show a summary and open the dashboard
Phase 0: Prerequisites
Step 1: Locate Skill Directory
Use Glob("**/skills/l30/templates/dashboard.html") to find the dashboard template. Extract the parent directory path (everything before /templates/). Store as L30_SKILL_DIR.
Step 2: Verify Python Environment
Resolve L30_PYTHON in this order:
- If
$L30_PYTHONis set, use that interpreter. - Otherwise, if
$L30_HOMEis set, use$L30_HOME/.venv/bin/python. - Otherwise, use
python3found onPATH.
L30_HOME must be the l30 project directory. To configure a project-local environment in one step:
cd <l30-project-directory> && python3 -m venv .venv && .venv/bin/pip install -e .
Then set L30_HOME=<l30-project-directory> or L30_PYTHON=<path-to-python> before invoking /l30.
Run a Bash command that resolves the interpreter in that order and verifies it:
if [ -n "${L30_PYTHON:-}" ]; then
VENV="$L30_PYTHON"
elif [ -n "${L30_HOME:-}" ]; then
VENV="$L30_HOME/.venv/bin/python"
else
VENV="$(command -v python3 || true)"
fi
test -n "$VENV" && test -x "$VENV" && "$VENV" -c 'import l30' && printf '%s\n' "$VENV"
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.
- 2mo ago First seen · 371 lines · 59 tokens per session scan A 49dd33b325e4
l30 is a skill published in the GitHub repository Kasempiternal/Claude-Agent-System (16 stars, last pushed 3mo ago), licensed MIT. It adds 59 tokens to every session and 3,718 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.
l30 compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| l30Kasempiternal/Claude-Agent-System | Skill | 16 | 3mo ago | MIT | A | 59 | Claude Code |
| project-setupastropham1808/astro-agent-skills | Skill | 1 | 1mo ago | none | A | 150 | Claude Code |
| spine-reviewtonone-ai/tonone | Skill | 77 | 4d ago | MIT | A | 52 | Claude Code |
| python-servicesiliaal/whetstone | Skill | 36 | today | MIT | A | 48 | Claude Code, Codex |
| nodejs-backendiliaal/whetstone | Skill | 36 | today | MIT | A | 50 | Claude Code, Codex |
| documentationlgbarn/shipyard | Skill | 67 | 24d ago | MIT | A | 62 | Claude Code |
| fec-data-fetchingbovinphang/frontend-craft | Skill | 24 | yesterday | MIT | A | 76 | Claude Code |