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.
/plugin marketplace add jtsternberg/claude-pluginsnpx agentmods add plugins/jtsternberg/claude-plugins/fablegit clone --depth 1 https://github.com/jtsternberg/claude-pluginsGrade A, and why
fable 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
{
"name": "fable",
"description": "Skills for working with — and like — the Fable model (claude-fable-5). Ships fable-delegate, which keeps a Fable main agent in the thinker/boss role and routes execution to Opus/Sonnet subagents, and fable-mode, which codifies the operating stance behind Fable's judgment for agents on other models.",
"version": "0.2.4",
"author": {
"name": "Justin Sternberg",
"email": "[email protected]",
"url": "https://github.com/jtsternberg"
}
}
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 · 11 lines scan A 47ab77799205
fable is a plugin published in the GitHub repository jtsternberg/claude-plugins (5 stars, last pushed 4d ago), licensed MIT. Its token cost is not measured: this kind of file is read by the harness, not the model. 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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