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 joaquimscosta/arkhe-claude-plugins --skill using-arkhe-skillsgit clone --depth 1 https://github.com/joaquimscosta/arkhe-claude-pluginsWrote 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/joaquimscosta/arkhe-claude-plugins/using-arkhe-skills)<a href="https://agentmods.dev/skills/joaquimscosta/arkhe-claude-plugins/using-arkhe-skills"><img src="https://agentmods.dev/badge/skills/joaquimscosta/arkhe-claude-plugins/using-arkhe-skills/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/joaquimscosta/arkhe-claude-plugins/using-arkhe-skills"><img src="https://agentmods.dev/badge/skills/joaquimscosta/arkhe-claude-plugins/using-arkhe-skills.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 | $0.00069 | $0.01128 |
| Opus 5 | $0.00034 | $0.00564 |
| Sonnet 5 | $0.00014 | $0.00226 |
| Haiku 4.5 | $0.00007 | $0.00113 |
Grade A, and why
using-arkhe-skills 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 11d 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 — 74 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Using arkhe Skills Across Platforms
arkhe plugins ship the same SKILL.md files across CLI harnesses. This bootstrap establishes how to access skills and how to translate platform tool names into equivalent operations on Claude Code, Antigravity CLI (agy), Gemini CLI, and Codex CLI.
How to Access Skills
- Claude Code: Use the
Skilltool. When invoked, the skill content is loaded and presented to follow directly. - Antigravity CLI (
agy): Skill metadata (name + description) is auto-loaded into the system prompt at session start. When triggers fire, useview_fileto loadskills/<skill-name>/SKILL.mdfrom the plugin directory, then follow its instructions. - Gemini CLI (Legacy): Skill metadata is loaded into system prompt. Use
read_fileto loadskills/<skill-name>/SKILL.md. - Codex CLI: Skill index and trigger phrases are inlined in
AGENTS.mdat install time. Follow the skill body directly when a trigger phrase fires.
Platform Tool Mapping
arkhe SKILL.md files reference core agent primitives. On each platform, substitute the equivalent operation from this table.
| Primitive / Claude tool | Antigravity CLI (agy) equivalent |
Gemini CLI (Legacy) equivalent | Codex CLI equivalent |
|---|---|---|---|
AskUserQuestion |
ask_question (native interactive modal with chip UI options) |
Ask a plain-text question with numbered choices and await reply. | Plain-text question with numbered choices. |
TaskCreate / TaskUpdate |
manage_task or inline TODO list rendered on each turn |
Inline TODO list rendered on each turn | Inline TODO list rendered on each turn |
EnterPlanMode / ExitPlanMode |
Native --mode plan / accept-edits mode |
Announce plan mode and gate writes on approval | Announce plan mode and gate writes on approval |
Skill tool (Skill) |
view_file on skills/<name>/SKILL.md |
read_file on skills/<name>/SKILL.md |
Skill content inlined in AGENTS.md |
Agent tool (subagent_type) |
invoke_subagent / define_subagent (native background/concurrent subagent execution) |
Inline agent prompt into current session | Inline agent prompt into current session |
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.
- 11d ago First seen · 74 lines · 69 tokens per session scan A c9dd22915819
using-arkhe-skills is a skill published in the GitHub repository joaquimscosta/arkhe-claude-plugins (21 stars, last pushed 27d ago), licensed MIT. It adds 69 tokens to every session and 1,128 once invoked, about $0.0003 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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