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 Human-Frontier-Labs-Inc/human-frontier-labs-marketplace --skill effective-expogit clone --depth 1 https://github.com/Human-Frontier-Labs-Inc/human-frontier-labs-marketplaceWrote 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/human-frontier-labs-inc/human-frontier-labs-marketplace/effective-expo)<a href="https://agentmods.dev/skills/human-frontier-labs-inc/human-frontier-labs-marketplace/effective-expo"><img src="https://agentmods.dev/badge/skills/human-frontier-labs-inc/human-frontier-labs-marketplace/effective-expo/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/human-frontier-labs-inc/human-frontier-labs-marketplace/effective-expo"><img src="https://agentmods.dev/badge/skills/human-frontier-labs-inc/human-frontier-labs-marketplace/effective-expo.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 | $0.00136 | $0.01794 |
| Opus 5.5 | $0.00054 | $0.00718 |
| Sonnet 5.5 | $0.00027 | $0.00359 |
| Haiku 4.5 | $0.00014 | $0.00179 |
Grade A, and why
effective-expo 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 2mo 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.
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
1 file 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.
- 2mo ago First seen · 76 lines · 136 tokens per session scan A 350dbec0dff5
effective-expo is a skill published in the GitHub repository Human-Frontier-Labs-Inc/human-frontier-labs-marketplace (6 stars, last pushed 8d ago), with no licence file. It adds 136 tokens to every session and 1,794 once invoked, about $0.0005 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 2026-08-31.
effective-expo compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| effective-expoHuman-Frontier-Labs-Inc/human-frontier-labs-marketplace | Skill | 6 | 8d ago | none | A | 136 | Claude Code, Codex |
| agent-spec-mobile-react-nativeruvnet/ruflo | Skill | 81k | yesterday | MIT | A | 22 | Claude Code |
| react-native-devMiniMax-AI/skills | Skill | 14k | yesterday | MIT | A | 102 | Claude Code |
| expo-native-uiexpo/skills | Skill | 4.1k | 5d ago | MIT | A | 63 | Claude Code, Codex |
| expo-brownfieldexpo/skills | Skill | 4.1k | 5d ago | MIT | A | 70 | Claude Code, Codex |
| react-native-testingcallstack/react-native-testing-library | Skill | 3.4k | 2d ago | MIT | A | 134 | Claude Code, Codex |
| truesheet-usagelodev09/react-native-true-sheet | Skill | 2.1k | 2d ago | MIT | A | 171 | Claude Code, Codex |