Deepsec Documentation Guide
vercel-labs/deepsec
Points the agent at deepsec's own docs to answer questions about initializing, configuring, resuming, scanning with and extending the vulnerability scanner.
A skill your agent uses for authorized email security review including phishing analysis, header authentication (SPF/DKIM/DMARC), BEC patterns, and mailbox token abuse research.
Install Email Security
The automated check flagged lines worth reading first. See the safety section below.
$ npx skills add zhaoxuya520/reverse-skill --skill email-security -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install zhaoxuya520/reverse-skill email-security --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/zhaoxuya520/reverse-skill.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/email-security .claude/skills/email-security && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "email-security" agent skill from https://github.com/zhaoxuya520/reverse-skill/tree/main/skills/email-security into .claude/skills/email-security/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "email-security", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/zhaoxuya520/reverse-skill/tree/main/skills/email-securityType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add zhaoxuya520/reverse-skill --skill email-security -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install zhaoxuya520/reverse-skill email-security --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/zhaoxuya520/reverse-skill.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/email-security .agents/skills/email-security && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "email-security" agent skill from https://github.com/zhaoxuya520/reverse-skill/tree/main/skills/email-security into .agents/skills/email-security/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "email-security", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add zhaoxuya520/reverse-skill --skill email-security -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install zhaoxuya520/reverse-skill email-security --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/zhaoxuya520/reverse-skill.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/email-security .cursor/skills/email-security && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "email-security" agent skill from https://github.com/zhaoxuya520/reverse-skill/tree/main/skills/email-security into .cursor/skills/email-security/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "email-security", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/zhaoxuya520/reverse-skill.git --path skills/email-security--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add zhaoxuya520/reverse-skill --skill email-security -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install zhaoxuya520/reverse-skill email-security --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/zhaoxuya520/reverse-skill.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/email-security .gemini/skills/email-security && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "email-security" agent skill from https://github.com/zhaoxuya520/reverse-skill/tree/main/skills/email-security into .gemini/skills/email-security/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "email-security", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install zhaoxuya520/reverse-skill email-securityInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add zhaoxuya520/reverse-skill --skill email-security -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/zhaoxuya520/reverse-skill.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/email-security .github/skills/email-security && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "email-security" agent skill from https://github.com/zhaoxuya520/reverse-skill/tree/main/skills/email-security into .github/skills/email-security/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "email-security", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add zhaoxuya520/reverse-skill --skill email-security -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install zhaoxuya520/reverse-skill email-security --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/zhaoxuya520/reverse-skill.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/email-security .opencode/skills/email-security && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "email-security" agent skill from https://github.com/zhaoxuya520/reverse-skill/tree/main/skills/email-security into .opencode/skills/email-security/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "email-security", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
email-security- GitHub stars
- 41k
- Used in
- 2 other repos
- Token cost
- ~259 tokens
- SKILL.md length
- 64 words
- Files
- 2 (incl. references)
- Skills in repo
- 19
- Repo updated
- First seen
- Licence
- MIT
At a glance
A skill your agent uses for authorized email security review including phishing analysis, header authentication (SPF/DKIM/DMARC), BEC patterns, and mailbox token abuse research.
- Works in 3 steps: NOW: 确认授权（分析样本邮件 / 租户配置评审） → NOW: 不向真实用户二次投递恶意样本 → ACT: 头认证 → 内容/URL → 附件沙箱 → 租户控制面建议
- Authorized email security review including phishing analysis
- SKILL.md covers ACTION REQUIRED（读完后立刻执行）, 适用场景, 工作流 and 工具链, plus 3 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Email Security is an agent skill from zhaoxuya520/reverse-skill. Use for authorized email security review including phishing analysis, header authentication (SPF/DKIM/DMARC), BEC patterns, and mailbox token abuse research.
Its SKILL.md is about 260 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including reference files (for example `references/email-auth-checklist.md`).
It sits in Security, covering Security review. The repository describes itself as: Reverse Engineering / Authorized Penetration Testing / Security Research Skill Router Pack AI-powered routing + On-demand toolchain bootstrapping + Self-evolving knowledge base…. The licence is MIT.
When your agent uses it
- Authorized email security review including phishing analysis
- Header authentication (SPF/DKIM/DMARC)
- Mailbox token abuse research
Example prompts
- “/email-security”
Workflow steps
3 steps, taken from the first numbered list in SKILL.md.
- NOW: 确认授权（分析样本邮件 / 租户配置评审）
- NOW: 不向真实用户二次投递恶意样本
- ACT: 头认证 → 内容/URL → 附件沙箱 → 租户控制面建议
What it can do on your machine
Read from SKILL.md and the folder at commit cab634b. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md.
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Email Security loads about 259 tokens when it runs, and up to ~312 if it reads all its reference files. Until then it costs about 43 tokens; SKILL.md has 64 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check: warnings
The automated check found patterns that need a careful read before installing.
- WarningTells the agent its actions are pre-authorized / not to stop for confirmationSKILL.md:10
1. `NOW`: 确认授权（分析样本邮件 / 租户配置评审）
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from zhaoxuya520/reverse-skill at commit cab634b, republished under its MIT licence (© zhaoxuya520). 64 words, ~259 tokens.
Download SKILL.mdSave it as
.claude/skills/email-security/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.- name
- email-security
- description
- Use for authorized email security review including phishing analysis, header authentication (SPF/DKIM/DMARC), BEC patterns, and mailbox token abuse research.
Email Security & Phishing Analysis
ACTION REQUIRED（读完后立刻执行）
NOW: 确认授权（分析样本邮件 / 租户配置评审）NOW: 不向真实用户二次投递恶意样本ACT: 头认证 → 内容/URL → 附件沙箱 → 租户控制面建议
适用场景
- 钓鱼邮件拆解与 IOC
- SPF/DKIM/DMARC 配置评估
- BEC 商务邮件欺诈模式
- OAuth 应用钓鱼 / 邮箱令牌滥用（联合 llm/cloud 身份）
- 安全意识演练设计（授权）
工作流
□ 完整原始头：Received 链、From/Return-Path 一致性
□ SPF/DKIM/DMARC 对齐结果
□ URL 沙箱与附件静态（联合 malware-analysis）
□ 仿冒品牌与回复地址差异
□ 租户：反钓鱼策略、外部标记、MFA、OAuth app 同意工具链
| 工具 | 用途 |
|---|---|
| 邮件客户端「查看源」 | 头 |
| dig/nslookup | SPF/DMARC 记录 |
| urlscan / 沙箱 | 链接与附件 |
| 租户管理中心 | 策略 |
参考
references/email-auth-checklist.md../malware-analysis/../attack-chain/（钓鱼阶段）../windows-ad/（令牌）
路由上下文
上游: MASTER R36
MUST NOT: 未授权对第三方域群发测试钓鱼
任务完成自检
- 头认证结论是否完整？
- IOC 是否可检测化（联合 threat-hunting）？
- Checklist？
© zhaoxuya520, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 1 other file (references) in skills/email-security of zhaoxuya520/reverse-skill.
- SKILL.md
- references/email-auth-checklist.md
Open the folder on GitHubat commit cab634b
Used in 2 other repositories
We found 2 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 2 other GitHub owners. This page covers the copy in zhaoxuya520/reverse-skill, which our catalogue first saw on October 7, 2026.
Compare with similar skills
Email Security next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Email Security this skillzhaoxuya520/reverse-skill | 41k | 2 repos | ~259 | Automated safety check: Warn | MIT | |
| Deepsec Documentation Guidevercel-labs/deepsec | 8.1k | — | ~956 | Automated safety check: Pass | Apache-2.0 | |
| Kubernetes Network Security Auditkubeshark/kubeshark | 12k | — | ~7.3k | Automated safety check: Notes | Apache-2.0 | |
| Native Dependency Updatemono/SkiaSharp | 5.6k | — | ~4.1k | Automated safety check: Pass | MIT | |
| Semgrep Security Scantrailofbits/skills | 7.5k | — | ~3.7k | Automated safety check: Notes | CC-BY-SA-4.0 | |
| Skillward AuditFangcun-AI/SkillWard | 143 | — | ~2.9k | Automated safety check: Pass | Custom licence |
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Detects languages, proposes rulesets for approval, then runs the approved Semgrep scan across a codebase and merges the output into one SARIF file.
Skillward Audit
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Security-audit a third-party skill bundle (folder with SKILL.md, or .zip / .tar.gz archive) before installing it, using the SkillWard cloud scanner.
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Questions about Email Security
What does Email Security do?
A skill your agent uses for authorized email security review including phishing analysis, header authentication (SPF/DKIM/DMARC), BEC patterns, and mailbox token abuse research. Email Security is an agent skill from zhaoxuya520/reverse-skill. Use for authorized email security review including phishing analysis, header authentication (SPF/DKIM/DMARC), BEC patterns, and mailbox token abuse research.
When should I use Email Security?
Email Security fits situations like: authorized email security review including phishing analysis; header authentication (SPF/DKIM/DMARC); mailbox token abuse research.
How do I install Email Security in Claude Code?
Run `npx skills add zhaoxuya520/reverse-skill --skill email-security -a claude-code`. Or copy the skill folder (skills/email-security in zhaoxuya520/reverse-skill) into .claude/skills/email-security in your project. Claude Code loads it when a task matches its description.
How do I install Email Security in Codex?
Run `npx skills add zhaoxuya520/reverse-skill --skill email-security -a codex`. Or copy the skill folder (skills/email-security in zhaoxuya520/reverse-skill) into .agents/skills/email-security in your project. Codex loads it when a task matches its description.
Can I use Email Security in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add zhaoxuya520/reverse-skill --skill email-security -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/email-security, .gemini/skills/email-security, .github/skills/email-security and .opencode/skills/email-security in your project.
What does Email Security need to run?
SKILL.md names no scripts, command-line tools or credentials: Email Security is instructions for the agent only.
Does Email Security access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Email Security safe to install?
Our automated static check of SKILL.md flagged 1 warning(s): tells the agent its actions are pre-authorized / not to stop for confirmation. Read the flagged lines before installing; the check is not a guarantee either way.
What licence does Email Security use?
Email Security is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Email Security use?
About 259 tokens (SKILL.md is roughly 1k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 53 tokens, read only when the agent opens those files.
What are the alternatives to Email Security?
Skills that share tags, products or a category with Email Security: Deepsec Documentation Guide (vercel-labs/deepsec, 8.1k stars), Kubernetes Network Security Audit (kubeshark/kubeshark, 12k stars), Native Dependency Update (mono/SkiaSharp, 5.6k stars) and Semgrep Security Scan (trailofbits/skills, 7.5k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Email Security?
zhaoxuya520 (a GitHub user) maintains it in zhaoxuya520/reverse-skill, which has 40,590 GitHub stars. The repository holds 19 skills in this directory. The repository was last updated on September 22, 2026.
Source: zhaoxuya520/reverse-skill on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.