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/understudylabs/understudy-agent-tools/install-pluginnpx skills add understudylabs/understudy-agent-tools --skill install-plugingit clone --depth 1 https://github.com/understudylabs/understudy-agent-toolsWhat 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 | $0.00418 |
| Opus 5 | $0.00034 | $0.00209 |
| Sonnet 5 | $0.00014 | $0.00084 |
| Haiku 4.5 | $0.00007 | $0.00042 |
Grade A, and why
install-plugin scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
Install the Understudy Claude Code plugin
This skill is a compatibility shim. The consolidated setup surface is
install-agent-adapter.
Procedure
Load install-agent-adapter and run it with platform claude-code.
Use its reference.md for
the current commands:
claude plugin marketplace add "$REPO"
claude plugin install understudy@understudy-skills
Activation is user-typed:
/reload-plugins
/understudy:onboard
Safety Gates
Local-first and free: installing the Claude Code adapter only registers local skills. It must not authenticate, upload data, inspect secret values, download model weights, start hosted jobs, or make provider calls.
- Do not claim you ran
/reload-plugins; the developer must type it. - Do not edit Claude settings files by hand to force-enable the plugin.
- Do not copy or fork skill content outside the plugin/marketplace path.
Resolve CLI
No Understudy CLI command is required. Prefer the claude plugin CLI when
available; otherwise show the interactive /plugin ... commands from
install-agent-adapter/reference.md.
Output Standard
End with: that this routed through install-agent-adapter; whether the Claude
plugin was installed/refreshed/shown for manual run; /reload-plugins; the next
command /understudy:onboard; and the uninstall commands.
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 · 56 lines · 69 tokens per session scan A 0abf1ff56851
install-plugin is a skill published in the GitHub repository understudylabs/understudy-agent-tools (16 stars, last pushed 2d ago), licensed MIT. It adds 69 tokens to every session and 418 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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