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 LerianStudio/ring --skill testing-skills-with-subagentsgit clone --depth 1 https://github.com/LerianStudio/ringWrote 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/lerianstudio/ring/testing-skills-with-subagents)<a href="https://agentmods.dev/skills/lerianstudio/ring/testing-skills-with-subagents"><img src="https://agentmods.dev/badge/skills/lerianstudio/ring/testing-skills-with-subagents/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/lerianstudio/ring/testing-skills-with-subagents"><img src="https://agentmods.dev/badge/skills/lerianstudio/ring/testing-skills-with-subagents.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 2 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 22 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 Rogue Agent · line 38 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.
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 | $0.00090 | $0.00860 |
| Opus 5.5 | $0.00036 | $0.00344 |
| Sonnet 5.5 | $0.00018 | $0.00172 |
| Haiku 4.5 | $0.00009 | $0.00086 |
Grade A, and why
ring:testing-skills-with-subagents 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 1mo 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 — 91 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Testing Skills With Subagents
When to use
- Before deploying a new skill
- After editing an existing skill
- Skill enforces discipline that could be rationalized away
Skip when
- Pure reference skill → no behavior to test
- No rules that agents have incentive to bypass
Related
Complementary: ring:writing-skills, ring:test-driven-development
Testing skills is TDD applied to process documentation.
Run scenarios without the skill (RED — watch agent fail), write skill addressing those failures (GREEN), then close loopholes (REFACTOR).
Prerequisite: Understand ring:test-driven-development first. Complete worked example: examples/CLAUDE_MD_TESTING.md.
When to Test
Test skills that: enforce discipline (TDD, testing requirements), have compliance costs (time, effort, rework), could be rationalized away ("just this once"), or contradict immediate goals (speed over quality).
Skip: Pure reference skills (API docs), skills without rules to violate.
TDD Mapping
| TDD Phase | Skill Testing | What You Do |
|---|---|---|
| RED | Baseline test | Run scenario WITHOUT skill, watch agent fail |
| Verify RED | Capture rationalizations | Document exact failures verbatim |
| GREEN | Write skill | Address specific baseline failures |
| Verify GREEN | Pressure test | Run WITH skill, verify compliance under pressure |
| REFACTOR | Plug holes | Find new rationalizations, add counters |
RED Phase: Watch It Fail
Run 3+ combined-pressure scenarios WITHOUT the skill. Document agent choices and rationalizations word-for-word.
Why verbatim? Exact wording reveals the loopholes to close.
Writing Pressure Scenarios
| Quality | Example |
|---|---|
| Bad | "What does the skill say?" — agent recites |
| Good | "Production down, $10k/min, 5min window" — single pressure |
| Great | "3hr/200 lines done, 6pm, dinner plans, forgot TDD. A) Delete B) Commit C) Tests now" — multi-pressure + forced choice |
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.
- 1mo ago First seen · 91 lines · 90 tokens per session scan A 97c2d7498588
ring:testing-skills-with-subagents is a skill published in the GitHub repository LerianStudio/ring (218 stars, last pushed 2d ago), licensed Apache-2.0. It adds 90 tokens to every session and 860 once invoked, about $0.0004 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.
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