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/agentmailgit clone --depth 1 https://github.com/jtsternberg/claude-pluginsGrade A, and why
agentmail 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
{
"name": "agentmail",
"description": "Give an agent its own email address. Send and receive email through the AgentMail API via the official agentmail CLI: create inboxes, send mail, read incoming messages and threads, reply / reply-all / forward, manage and schedule drafts, triage an inbox, keep a local address book of people and other agents, relay tagged work orders to another AI agent, and run the agent self-signup and OTP verification flow. Ships an opt-in hook that notices unread mail during a session. Triggers on mentions of AgentMail, agent email, inbox creation, sending or checking email for an agent, contacts or address lookup, inbox triage, and emailing another agent.",
"version": "0.2.1",
"author": {
"name": "JT Sternberg",
"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.
- 2d ago First seen · 10 lines scan A f94f5208880b
agentmail 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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