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 skills add vaayne/agent-kit --skill cmailgit clone --depth 1 https://github.com/vaayne/agent-kitWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/vaayne/agent-kit/cmail)<a href="https://agentmods.dev/skills/vaayne/agent-kit/cmail"><img src="https://agentmods.dev/badge/skills/vaayne/agent-kit/cmail/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/vaayne/agent-kit/cmail"><img src="https://agentmods.dev/badge/skills/vaayne/agent-kit/cmail.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What 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 5.1 | $0.00138 | $0.01355 |
| Opus 5.5 | $0.00055 | $0.00542 |
| Sonnet 5.5 | $0.00028 | $0.00271 |
| Haiku 4.5 | $0.00014 | $0.00136 |
Grade A, and why
cmail scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
used instead of hand-written curl requests. How it starts
The opening of the file, as written. The whole thing — 136 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CMail domain email
Use scripts/cmail.py for all Cloud Mail API calls. Replace <skill-dir> below with
the absolute directory containing this SKILL.md; do not assume the user's current
working directory is the repository.
SCRIPT="<skill-dir>/scripts/cmail.py"
python "$SCRIPT" --help
Authentication
The runtime must provide:
CMAIL_HOST Cloud Mail server URL, for example https://mail.example.com
CMAIL_EMAIL Login email, normally an administrator for domain management
CMAIL_PASSWORD Login password
CMAIL_USER_AGENT Optional; defaults to curl/8.0.0 for Cloudflare compatibility
CMAIL_ALLOW_INSECURE_HTTP Optional; set to 1 only for a remote HTTP server
CMAIL_HOST may end in /api; the CLI normalizes it. Never ask the user to paste these
secrets into chat, print them, put them in command arguments, or include them in a
report. The CLI logs in with POST /api/login when no valid cached token is available
and sends the returned token directly as Authorization; it does not use the
deprecated public API or add a Bearer prefix. It sends a curl-compatible User-Agent by
default because some Cloudflare deployments reject Python's default User-Agent; override
it with CMAIL_USER_AGENT only when the reverse proxy requires a different value.
Remote hosts must use HTTPS by default. HTTP is allowed for localhost and loopback IPs;
set CMAIL_ALLOW_INSECURE_HTTP=1 only when the user explicitly accepts plaintext
credential and token transport.
After a successful login, the CLI caches the token in ~/.cache/cmail/token.json with
0600 permissions. Set CMAIL_TOKEN_CACHE to use another path. The cache is scoped to
the normalized host and login email; a 401/403 with a cached token invalidates it and
causes one fresh login before retrying the request. If the server still returns 403,
report the permission or server-side authentication failure rather than retrying.
Start with me when permissions or the account id are unclear:
python "$SCRIPT" me
python "$SCRIPT" account list
What ships with it
4 files 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.
- 1mo ago First seen · 136 lines · 138 tokens per session scan A 7d88c6e09e18
cmail is a skill published in the GitHub repository vaayne/agent-kit (53 stars, last pushed 4d ago), licensed MIT. It adds 138 tokens to every session and 1,355 once invoked, about $0.0006 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-17.
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