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 sangrokjung/claude-forge --skill skill-factorygit clone --depth 1 https://github.com/sangrokjung/claude-forgeWrote 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/sangrokjung/claude-forge/skill-factory)<a href="https://agentmods.dev/skills/sangrokjung/claude-forge/skill-factory"><img src="https://agentmods.dev/badge/skills/sangrokjung/claude-forge/skill-factory/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/sangrokjung/claude-forge/skill-factory"><img src="https://agentmods.dev/badge/skills/sangrokjung/claude-forge/skill-factory.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 9 findings, up to high
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- high Rogue Agent · line 252 Skill modifies its own code, configuration, or behavior at runtime. Self-modification enables an agent to escalate privileges, disable safety constraints, or install persistent backdoors.Fix: Prevent the skill from modifying its own code, SKILL.md, or configuration files. Treat skill files as read-only at runtime.
- high Agent Snooping · line 313 Skill reads from agent configuration directories (.claude/, .codex/, .gemini/). These directories may contain API keys, personal settings, and other credentials that the skill has no legitimate need to access.Fix: Remove all code or instructions that access agent configuration directories (.claude/, .codex/, .gemini/). If configuration values are needed, pass them explicitly as parameters or environment variabl
- medium Rogue Agent · line 127 Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.
- medium Agent Snooping · line 183 Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
- medium Agent Snooping · line 195 Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
- medium Agent Snooping · line 306 Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
- medium Rogue Agent · line 218 Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.
- medium Agent Snooping · line 304 Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
- medium Agent Snooping · line 313 Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
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 | $0.00122 | $0.02791 |
| Opus 5 | $0.00061 | $0.01396 |
| Sonnet 5 | $0.00024 | $0.00558 |
| Haiku 4.5 | $0.00012 | $0.00279 |
Grade A, and why
skill-factory 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 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.
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 — 338 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill Factory
Automated pipeline: session analysis -> duplicate check -> skill creation.
Requires: Python 3.8+, bash, git. Agent Teams path requires CLAUDE_CODE_EXPERIMENTAL_AGENT_TEAMS=1.
| Existing Skill | Role | skill-factory Difference |
|---|---|---|
| skill-creator (archived) | Manual 6-step guide | Automated pipeline |
| manage-skills | Drift detection (verify-* skills) | Proactive skill generation (manage-skills verifies existing; skill-factory creates new) |
| continuous-learning | Passive pattern extraction | On-demand + team execution |
Parameter Parsing
Parse $ARGUMENTS for flags:
| Flag | Default | Description |
|---|---|---|
--dry-run |
false | Analyze and report only, no file creation |
--no-team |
false | Run sequentially without Agent Teams |
--target |
(auto) | Specific pattern name to extract |
--scope |
global | global (~/. claude/skills/) or project (.claude/skills/) |
If no arguments, run full auto-detection pipeline.
Phase 1: Session Analysis
Collect what happened in this session:
# Uncommitted changes
git diff HEAD --name-only 2>/dev/null
# Recent commits on current branch
git log --oneline -20 2>/dev/null
# Branch diff from main
git diff main...HEAD --name-only 2>/dev/null
From collected changes, identify candidate patterns - repeatable workflows that appeared:
- Multi-step sequences - 3+ actions performed in consistent order
- Tool combinations - Specific tools used together (e.g., Grep + Read + Edit)
- Domain procedures - File types or directories accessed with specific operations
- Repeated transformations - Same type of change applied to multiple files
If --target is specified, focus analysis on that named pattern only.
For each candidate, produce a JSON entry (internal, not shown to user):
{
"name": "pattern-name",
"description": "What was done repeatedly",
"files": ["path/a.ts", "path/b.ts"],
"steps": ["Step1", "Step2", "Step3"],
"step_count": 3
}
What ships with it
6 files 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.
- 8d ago First seen · 338 lines · 122 tokens per session scan A 865648c17989
skill-factory is a skill published in the GitHub repository sangrokjung/claude-forge (837 stars, last pushed 8d ago), licensed MIT. It adds 122 tokens to every session and 2,791 once invoked, about $0.0006 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 2026-09-03.
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