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/blackblue-labs/skill2/skill2-testnpx skills add blackblue-labs/skill2 --skill skill2-testgit clone --depth 1 https://github.com/blackblue-labs/skill2Wrote 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/blackblue-labs/skill2/skill2-test)<a href="https://agentmods.dev/skills/blackblue-labs/skill2/skill2-test"><img src="https://agentmods.dev/badge/skills/blackblue-labs/skill2/skill2-test.svg" alt="Measured on agentmods" 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 | $0.00027 | $0.00454 |
| Opus 5 | $0.00014 | $0.00227 |
| Sonnet 5 | $0.00005 | $0.00091 |
| Haiku 4.5 | $0.00003 | $0.00045 |
Grade A, and why
skill2-test 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 5d 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 — 58 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Test Agent Skills
Measure behavior without inheriting current chat, global memory, or unrelated Skills.
Ownership
- Test owns live activation, outcome, routing, and baseline evidence.
- Audit owns static structure and trigger-overlap review.
- Create owns Skill changes; Test never rewrites a failing Skill automatically.
Layers
| Layer | Installed Skills | Measures |
|---|---|---|
| Target-only | Target Skill only | Activation, outcome, baseline uplift |
| Pack | Candidate sibling Skills | Routing and false activation |
Use target-only for core outcomes. Use pack for adjacent and unrelated routing cases.
Cases
- Core positive: target should activate and produce required artifact or answer.
- Paraphrase: same intent, different wording.
- Adjacent: sibling should own request.
- Unrelated: no package Skill should activate.
- Assertions: inspect files, output, commands, or explicit events.
Default one trial. Add repetitions only for known nondeterminism or regression confidence.
Isolation
- Fresh session, temporary home, temporary workspace.
- Install only layer-required Skills.
- Minimal authentication/configuration; no user memory or chat history.
- Guard host-home reads and writes.
- Adapter owns harness-specific install and event parsing.
- Save raw events, final output, workspace, version, and Skill hash locally.
Verdicts
pass: activation and outcome assertions pass.fail: deterministic assertion fails.inconclusive: runner or evidence cannot support claim.- Baseline also passes: no demonstrated deterministic uplift.
- Exact isolated
SKILL.mdread is medium-confidence activation; explicit activation event is high confidence.
Fake runner tests validate adapter plumbing, not provider behavior. Never claim unrun results.
uv run --script <skill-dir>/scripts/run -- test skills/<name> --agent <agent> --cases cases/<name>.yaml --baseline
uv run --script <skill-dir>/scripts/run -- test skills/<name> --agent <agent> --cases cases/<name>.yaml --pack
What ships with it
10 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.
- scripts/_runtime/skill2/__init__.py 22 B runs code
- scripts/_runtime/skill2/cases.py 4.0 KB runs code
- scripts/_runtime/skill2/claude_runner.py 8.3 KB runs code
- scripts/_runtime/skill2/cli.py 13 KB runs code
- scripts/_runtime/skill2/codex_runner.py 12 KB runs code
- scripts/_runtime/skill2/models.py 6.5 KB runs code
- scripts/_runtime/skill2/scan.py 7.3 KB runs code
- scripts/_runtime/skill2/tester.py 18 KB runs code
- scripts/.runtime-manifest.json 1.4 KB
- scripts/run 863 B
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.
- 5d ago First seen · 58 lines · 27 tokens per session scan A fe2adba942d9
skill2-test is a skill published in the GitHub repository blackblue-labs/skill2 (33 stars, last pushed 21d ago), licensed MIT. It adds 27 tokens to every session and 454 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 2026-08-30.
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