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 jonmumm/skills --skill nightshiftgit clone --depth 1 https://github.com/jonmumm/skillsWrote 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/jonmumm/skills/nightshift)<a href="https://agentmods.dev/skills/jonmumm/skills/nightshift"><img src="https://agentmods.dev/badge/skills/jonmumm/skills/nightshift/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/jonmumm/skills/nightshift"><img src="https://agentmods.dev/badge/skills/jonmumm/skills/nightshift.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 | $0.00095 | $0.06806 |
| Opus 5.5 | $0.00038 | $0.02722 |
| Sonnet 5.5 | $0.00019 | $0.01361 |
| Haiku 4.5 | $0.00010 | $0.00681 |
Grade D, and why
nightshift scanned grade D with 2 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Sends data to an external URLmediumData exfiltration
A POST to an outside endpoint may be telemetry or may be exfiltration; either way the mod talks to somewhere, and you should know where.
const res = await SELF.fetch("https://api.test/api/v1/devices/register", { method: "POST", Recursive force deletehighDestructive command
rm -rf with a variable or a broad path is one typo away from removing the wrong tree.
"command": "echo \"$TOOL_INPUT\" | grep -qE '(rm -rf|git push --force|git reset --hard|DROP TABLE|kubectl delete)' && echo 'BLOCK: Destructive command blocked during nightshift. Use explicit confirmation.' || true" The source is not reproduced here
No licence file
A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.
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.
- 1mo ago Changed · +2 lines 9252e66c8953
- 2mo ago First seen · 680 lines · 95 tokens per session scan D 55c62df7a5d6
nightshift is a skill published in the GitHub repository jonmumm/skills (3 stars, last pushed 12d ago), with no licence file. It adds 95 tokens to every session and 6,806 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it D with 2 findings (sends data to an external url, recursive force delete). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
nightshift compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| nightshiftjonmumm/skills | Skill | 3 | 12d ago | none | D | 95 | Claude Code, Codex |
| engram-testing-coverageGentleman-Programming/engram | Skill | 7.8k | today | MIT | A | 25 | Claude Code, Codex |
| principle-test-behavior-not-implementationmichael-denyer/pstack-claude | Skill | 4.1k | yesterday | MIT | A | 50 | Claude Code |
| tddcodewithmukesh/dotnet-claude-kit | Skill | 807 | 3d ago | MIT | A | 81 | Claude Code |
| nw-ddd-eventsourcingnWave-ai/nWave | Skill | 632 | 2d ago | MIT | A | 38 | Claude Code |
| nw-fp-clojurenWave-ai/nWave | Skill | 632 | 2d ago | MIT | A | 25 | Claude Code |
| nw-leanux-methodologynWave-ai/nWave | Skill | 632 | 2d ago | MIT | A | 37 | Claude Code |