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/blockcell-labs/blockcell/bcmailnpx skills add blockcell-labs/blockcell --skill bcmailgit clone --depth 1 https://github.com/blockcell-labs/blockcellWhat 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 | $0.00000 | $0.00894 |
| Opus 5 | $0.00000 | $0.00447 |
| Sonnet 5 | $0.00000 | $0.00179 |
| Haiku 4.5 | $0.00000 | $0.00089 |
Grade A, and why
bcmail 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 3d 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
BCMail
Shared {#shared}
- 适合通过工具
exec执行本地脚本python3 skills/bcmail/bcmail.py来发送邮件、查看收件箱、搜索邮件、统计未读和列出文件夹。 - 这个 skill 依赖环境变量
BCMAIL_EMAIL和BCMAIL_PASSWORD。缺任意一项时，先提示用户设置，再继续执行。 - 脚本会按邮箱域名自动选择服务器，当前支持：
163.com、vip.163.com、126.com、vip.126.com、188.com、vip.188.com、yeah.net、gmail.com、outlook.com、qq.com。 - 绝对不能：
- 编造未执行命令的邮件列表、邮件正文、发送结果或未读数量。
- 回显或泄露
BCMAIL_PASSWORD。 - 在收件人、主题或正文缺失时直接发送邮件。
- 在没有明确邮件 ID 时执行
read。
Prompt {#prompt}
-
工具策略：
- 用
exec调用python3 skills/bcmail/bcmail.py ...。 - 若命令成功且有输出，最终回复必须基于实际输出整理，不能改写成未验证的结论。
- 若脚本提示缺少环境变量或不支持的邮箱域名，直接说明原因，不要臆造替代方案。
- 用
-
按意图执行命令：
- 查看最新邮件：
python3 skills/bcmail/bcmail.py inbox - 查看未读邮件：
python3 skills/bcmail/bcmail.py inbox --unread - 限制数量：
python3 skills/bcmail/bcmail.py inbox --limit 5 - 搜索邮件：
python3 skills/bcmail/bcmail.py search --keyword "关键词" - 读取邮件详情：
python3 skills/bcmail/bcmail.py read --id 123 - 统计未读：
python3 skills/bcmail/bcmail.py unread - 列出文件夹：
python3 skills/bcmail/bcmail.py folders
- 查看最新邮件：
-
发送邮件前置条件：
- 必须确认
to、subject、body已完整。 - 用户要求 HTML 邮件时加
--html。 - 用户提供抄送时加
--cc "[email protected],[email protected]"。 - 用户提供附件时加
--attach file1.pdf file2.png。
- 必须确认
-
发送命令示例：
- 纯文本：
python3 skills/bcmail/bcmail.py send --to "[email protected]" --subject "会议" --body "明天下午两点开会" - HTML：
python3 skills/bcmail/bcmail.py send --to "[email protected]" --subject "日报" --html --body "<h1>日报</h1>" - 含抄送和附件：
python3 skills/bcmail/bcmail.py send --to "[email protected]" --cc "[email protected]" --subject "报告" --attach report.pdf chart.png --body "见附件"
- 纯文本：
-
澄清规则：
- 用户只说“发个邮件”但没给全收件人、主题、正文时，先补齐信息。
- 用户要“读某封邮件”但没给明确邮件 ID 时，先让用户提供邮件 ID。
- 用户要“看邮箱”或“查未读”时，不需要额外确认，直接执行。
Summary {#summary}
- 最终回复保留关键信息：发件人、收件人、主题、时间、未读数量或搜索命中情况。
- 发信结果要明确写“已发送”或“发送失败”，并附上脚本返回的关键信息。
- 不要输出无意义调试信息、环境变量原值或内部实现细节。
What ships with it
2 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.
- 3d ago First seen · 51 lines · 0 tokens per session scan A 0a3776aa18d1
bcmail is a skill published in the GitHub repository blockcell-labs/blockcell (263 stars, last pushed 19d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 894 tokens. 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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