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 athola/claude-night-market --skill skill-library-missiongit clone --depth 1 https://github.com/athola/claude-night-marketWrote 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/athola/claude-night-market/skill-library-mission)<a href="https://agentmods.dev/skills/athola/claude-night-market/skill-library-mission"><img src="https://agentmods.dev/badge/skills/athola/claude-night-market/skill-library-mission/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/athola/claude-night-market/skill-library-mission"><img src="https://agentmods.dev/badge/skills/athola/claude-night-market/skill-library-mission.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 2 findings, up to medium
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 →
- medium Excessive Agency · line 142 Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.Fix: Add human-in-the-loop confirmation for destructive, irreversible, or high-impact operations. Never auto-execute commands that modify files, send data, or alter system state.
- medium Agent Snooping · line 167 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 | $0.00040 | $0.01484 |
| Opus 5 | $0.00020 | $0.00742 |
| Sonnet 5 | $0.00008 | $0.00297 |
| Haiku 4.5 | $0.00004 | $0.00148 |
Grade B, and why
skill-library-mission scanned grade B with 1 finding 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 9d 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.
Enumerates other installed skillsmediumAgent snooping
Other skills' SKILL.md files reveal prompts, capabilities and secrets that should be invisible to peers.
`ls .claude/skills/ | head -5` How it starts
The opening of the file, as written. The whole thing — 168 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill Library Mission
Overview
A retiring distinguished fellow's final task: package everything the
project knows into a skill library under .claude/skills/, so that
cheaper sessions and newer engineers can carry the project forward at
the same standard. This skill turns that one-off exercise into a
repeatable mission with three gated phases: discover, author, review.
The mission produced its first library in this repository on
2026-07-02 (15 skills, mission skill-library-2026-07-02). The
generalized dispatch prompt distilled from that run is preserved
verbatim in references/mission-prompt.md.
When To Use
- A repository has deep tribal knowledge and no
.claude/skills/library, and future sessions (human or model) must operate without the current expert. - An existing project library has drifted and needs a full re-discovery and re-review pass.
- Onboarding cost is high: the same questions get re-answered and the same dead ends get re-fought across sessions.
When NOT To Use
| Situation | Use instead |
|---|---|
| Authoring or improving one skill | Skill(abstract:skill-authoring) |
| Skills shipped inside a plugin | Skill(plugin-dev:skill-development) |
| Auditing existing skills only | Skill(abstract:skills-eval) |
| Full project lifecycle (code, not knowledge) | Skill(attune:mission-orchestrator) |
Mission Shape
Run as an attune mission with custom phases so the run survives interruption and records user directives:
{
"mission_id": "skill-library-YYYY-MM-DD",
"type": "custom",
"phases": ["discover", "author", "review", "report"],
"artifacts": { "library_root": ".claude/skills/" }
}
Save this to .attune/mission-state.json, advance current_phase at
each gate, and record every user decision and override in
decisions / directive_overrides. A later session must be able to
resume from the state file alone.
Phase 1: Discover
No authoring happens in this phase. Investigate like an incoming principal engineer:
What ships with it
4 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.
- 9d ago First seen · 168 lines · 40 tokens per session scan B c1a8f247c662
skill-library-mission is a skill published in the GitHub repository athola/claude-night-market (337 stars, last pushed 2d ago), licensed MIT. It adds 40 tokens to every session and 1,484 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it B with 1 finding (enumerates other installed skills). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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