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-opencode-pluginnpx skills add understudylabs/understudy-agent-tools --skill install-opencode-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 | $0.00070 | $0.00551 |
| Opus 5 | $0.00035 | $0.00275 |
| Sonnet 5 | $0.00014 | $0.00110 |
| Haiku 4.5 | $0.00007 | $0.00055 |
Grade A, and why
install-opencode-plugin scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
Install the Understudy OpenCode skills
This skill is a compatibility shim. The consolidated setup surface is
install-agent-adapter.
The legacy skill name says "plugin" for compatibility with older prompts, but
the OpenCode implementation is not a JS/TS OpenCode plugin. It is a native
skills/commands adapter: symlink SKILL.md directories into OpenCode's global
skills directory and link the /understudy-onboard markdown command.
Procedure
Load install-agent-adapter and run it with platform opencode.
Use its reference.md for the
current native skill symlink install:
mkdir -p "$HOME/.config/opencode/skills" "$HOME/.config/opencode/commands"
The reference links each skills/<name>/ directory into OpenCode's global skill
directory and links .opencode/commands/understudy-onboard.md.
Activation:
Restart OpenCode or open a new TUI session.
/understudy-onboard
Safety Gates
Local-first and free: installing the OpenCode adapter only links local skills. It must not authenticate, upload data, inspect secret values, download model weights, start hosted jobs, or make provider calls.
- Do not overwrite existing non-Understudy OpenCode skills or commands.
- Do not copy private traces, keys, or
.understudy/state into OpenCode config. - Use symlinks back to this repo's shared
skills/tree. - If OpenCode asks before reading symlinked external resources, let the user make that permission decision; do not copy skill content to bypass it.
Resolve CLI
No Understudy CLI command is required. Use shell to create symlinks after
confirming the repo contains skills/understudy/SKILL.md.
Output Standard
End with: that this routed through install-agent-adapter; whether OpenCode
skills were linked/refreshed/skipped due to conflicts; the restart/new-session
step; /understudy-onboard; and the uninstall command.
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.
- yesterday First seen · 64 lines · 70 tokens per session scan A 757426c2baf0
install-opencode-plugin is a skill published in the GitHub repository understudylabs/understudy-agent-tools (16 stars, last pushed 2d ago), licensed MIT. It adds 70 tokens to every session and 551 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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