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/agentmail-to/agentmail-plugins/agentmail-clinpx skills add agentmail-to/agentmail-plugins --skill agentmail-cligit clone --depth 1 https://github.com/agentmail-to/agentmail-pluginsWhat 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 | $0.00061 | $0.00981 |
| Opus 5 | $0.00030 | $0.00491 |
| Sonnet 5 | $0.00012 | $0.00196 |
| Haiku 4.5 | $0.00006 | $0.00098 |
Grade A, and why
agentmail-cli 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.
How it starts
The opening of the file, as written. The whole thing — 124 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AgentMail CLI
Install the CLI and provide the API key through the environment.
npm install -g agentmail-cli
export AGENTMAIL_API_KEY="am_..."
Subcommands for a resource nested under another use a colon, e.g. inboxes:messages, inboxes:threads, pods:inboxes, pods:threads.
Inboxes
agentmail inboxes list
agentmail inboxes get --inbox-id <inbox_id>
agentmail inboxes create --display-name "Support Agent" --username support
agentmail inboxes delete --inbox-id <inbox_id>
Confirm the exact inbox before running the destructive delete command.
Messages and threads
agentmail inboxes:messages list --inbox-id <inbox_id>
agentmail inboxes:messages get --inbox-id <inbox_id> --message-id <message_id>
agentmail inboxes:messages send --inbox-id <inbox_id> \
--to "[email protected]" \
--subject "Hello" \
--text "Message body"
# HTML body instead of plain text
agentmail inboxes:messages send --inbox-id <inbox_id> \
--to "[email protected]" \
--subject "Hello" \
--html "<h1>Hello</h1>"
agentmail inboxes:messages reply --inbox-id <inbox_id> \
--message-id <message_id> \
--text "Reply body"
agentmail inboxes:messages forward --inbox-id <inbox_id> \
--message-id <message_id> \
--to "[email protected]"
agentmail inboxes:threads list --inbox-id <inbox_id>
agentmail inboxes:threads get --inbox-id <inbox_id> --thread-id <thread_id>
Use a message ID for replies. Fetch the full message before relying on body content.
Drafts
agentmail inboxes:drafts create --inbox-id <inbox_id> \
--to "[email protected]" \
--subject "Pending approval" \
--text "Draft body"
agentmail inboxes:drafts list --inbox-id <inbox_id>
agentmail inboxes:drafts get --inbox-id <inbox_id> --draft-id <draft_id>
agentmail inboxes:drafts send --inbox-id <inbox_id> --draft-id <draft_id>
Pods
Pods group inboxes together.
agentmail pods create --name "My Pod"
agentmail pods list
agentmail pods:inboxes create --pod-id <pod_id> --display-name "Pod Inbox"
agentmail pods:inboxes list --pod-id <pod_id>
agentmail pods:threads list --pod-id <pod_id>
agentmail pods:threads get --pod-id <pod_id> --thread-id <thread_id>
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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 · 124 lines · 61 tokens per session scan A 69aa94399ec3
agentmail-cli is a skill published in the GitHub repository agentmail-to/agentmail-plugins (12 stars, last pushed 8d ago), licensed MIT. It adds 61 tokens to every session and 981 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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