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/fragcap/plugin/installnpx skills add fragcap/plugin --skill installgit clone --depth 1 https://github.com/fragcap/pluginWhat 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 | $0.00035 | $0.00398 |
| Opus 5 | $0.00017 | $0.00199 |
| Sonnet 5 | $0.00007 | $0.00080 |
| Haiku 4.5 | $0.00003 | $0.00040 |
Grade A, and why
install scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
Install Capsule
Fetch a published capsule (SKILL.md) from GitHub Gist and install it into the current project so Claude Code loads it automatically in future sessions.
Script Convention
FRAGCAP_DATA="${CLAUDE_PLUGIN_DATA}" node "${CLAUDE_PLUGIN_ROOT}/scripts/<n>.mjs" [args]
If a script exits with a non-zero code or returns { error: "..." }, stop immediately and surface the error to the user. Never silently retry with a different command or skip the step.
When to Activate
- User runs
/fragcap:install <gist-id> - User explicitly asks to install a capsule (e.g., "install this", "save this to my project")
Flow
-
Get gist ID:
- If
$ARGUMENTSis provided, use it as the gist ID. - Otherwise, ask: "Which capsule would you like to install? Provide a gist ID or run
/fragcap:searchto find one."
- If
-
Install — run
install-capsule.mjs <gist-id>. -
Result:
- Success: show the installed path, capsule description, and tags. Explain that Claude Code will automatically load this skill in future sessions within this project.
- Error: show the error message.
Notes
- Capsules are installed to
.claude/skills/in the current working directory. - Claude Code automatically loads all
.mdfiles in.claude/skills/as context. - Installing the same capsule again will overwrite the previous version.
- To uninstall, simply delete the
.mdfile from.claude/skills/.
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 · 40 lines · 35 tokens per session scan A 5ddf3a35679c
install is a skill published in the GitHub repository fragcap/plugin (2 stars, last pushed 5mo ago), licensed MIT. It adds 35 tokens to every session and 398 once invoked, about $0.0002 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 2026-08-31.
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