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/archastro/archagents/installnpx skills add ArchAstro/archagents --skill installgit clone --depth 1 https://github.com/ArchAstro/archagentsWhat 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 | $0.00069 | $0.00529 |
| Opus 5 | $0.00034 | $0.00264 |
| Sonnet 5 | $0.00014 | $0.00106 |
| Haiku 4.5 | $0.00007 | $0.00053 |
Grade C, and why
install scanned grade C 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 2d 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.
Downloads and executes remote codehighSupply chain
curl | sh runs whatever the server returns today, which is not necessarily what it returned when this was reviewed.
curl -fsSL https://raw.githubusercontent.com/ArchAstro/archagents/main/install.sh | bash Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
allowed-tools: ["Bash(archagent:*)", "Bash(brew:*)", "Bash(curl:*)", "Bash(bash:*)", "Bash(sh:*)", "Bash(pwsh:*)", "Bash(powershell:*)"] This is a copy
94% identical to archagent-install — 2 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
What it actually says
Install ArchAgent CLI
Install or upgrade the public archagent binary from Homebrew or GitHub Releases.
Workflow
-
Check whether the CLI is already installed:
archagent --versionIf this succeeds, record the version.
-
If the CLI is present and the user didn't ask to upgrade, confirm the version and stop.
-
If the CLI is missing or the user asked to upgrade, install it using the public distribution path:
- On macOS, if Homebrew is available:
If the formula is already installed, run:brew install ArchAstro/tools/archagentbrew upgrade ArchAstro/tools/archagent - On Linux or macOS without Homebrew:
curl -fsSL https://raw.githubusercontent.com/ArchAstro/archagents/main/install.sh | bash - On Windows PowerShell:
irm https://raw.githubusercontent.com/ArchAstro/archagents/main/install.ps1 | iex
- On macOS, if Homebrew is available:
-
Verify installation:
archagent --version -
On failure, help troubleshoot the public install path:
- Missing
brewis expected on Linux and some macOS setups; fall back toinstall.sh. Permission deniedusually means they need--install-diror a user-writable target directory.command not found: archagentafter install usually means the install directory is not onPATH.- Release download failures usually mean the target release asset has not been published yet.
- Missing
-
On success, tell the user the CLI is ready and suggest they run
archagent setupto install the Claude Code/Codex plugins, thenarchagent auth login <email>to authenticate.
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.
- 2d ago First seen · 51 lines · 69 tokens per session scan C 378d3528c237
install is a skill published in the GitHub repository ArchAstro/archagents (5 stars, last pushed 16d ago), licensed MIT. It adds 69 tokens to every session and 529 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it C with 2 findings (downloads and executes remote code, makes network calls). It is 94% identical to archagent-install, differing in 2 lines, and is treated as a copy.
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