One search for your own team's files and the public ecosystem. See how real projects write their agent instructions, and bring the good ideas home.
Files you open will collect here, so you can find them again.
Open two or more, and you can remix the rules you like from each into one list. Kept in this browser only.
yaklangSkillyaklang/hack-skills/skills/browser-exploitation-v8/SKILL.md
Browser and V8 exploitation playbook. Use when exploiting JavaScript engine vulnerabilities including JIT type confusion, incorrect bounds elimination, and V8 sandbox bypass to achieve renderer RCE and sandbox escape in Chrome/Chromium.
2 projects use a version of this
yaklangSkillyaklang/hack-skills/skills/business-logic-vulnerabilities/SKILL.md
Business logic vulnerability playbook. Use when reasoning about workflows, race conditions, price manipulation, coupon abuse, state machines, and multi-step authorization gaps.
3 projects use a version of this
yaklangSkillyaklang/hack-skills/skills/business-logic-vuln/SKILL.md
Entry P1 category router for business logic testing. Use when workflow abuse, race conditions, pricing flaws, or multi-step state attacks matter more than parser-level input injection.
2 projects use a version of this
yaklangSkillyaklang/hack-skills/skills/classical-cipher-analysis/SKILL.md
Classical cipher analysis playbook. Use when encountering substitution ciphers, Vigenere, transposition, XOR, or encoded text in CTF challenges that requires frequency analysis, Kasiski examination, or known-plaintext cryptanalysis.
2 projects use a version of this
yaklangSkillyaklang/hack-skills/skills/clickjacking/SKILL.md
Clickjacking playbook. Use when testing whether target pages can be framed, whether X-Frame-Options or CSP frame-ancestors are properly configured, and whether UI redress attacks can trigger sensitive actions.
5 projects use a version of this
yaklangSkillyaklang/hack-skills/skills/cmdi-command-injection/SKILL.md
Command injection playbook. Use when user input may reach shell commands, process execution, converters, import pipelines, or blind out-of-band command sinks.
3 projects use a version of this
yaklangSkillyaklang/hack-skills/skills/code-obfuscation-deobfuscation/SKILL.md
Code obfuscation analysis and deobfuscation playbook. Use when reversing binaries protected by junk code, opaque predicates, self-modifying code, control flow flattening, VM protection, or string encryption.
4 projects use a version of this
yaklangSkillyaklang/hack-skills/skills/container-escape-techniques/SKILL.md
Container escape playbook. Use when operating inside a Docker container, LXC, or Kubernetes pod and need to escape to the host via privileged mode, capabilities, Docker socket, cgroup abuse, namespace tricks, or runtime vulnerabilities.
2 projects use a version of this
yaklangSkillyaklang/hack-skills/skills/cors-cross-origin-misconfiguration/SKILL.md
CORS misconfiguration testing playbook. Use when analyzing cross-origin trust, credentialed browser reads, origin reflection, preflight policy bugs, and browser-based access to authenticated APIs.
2 projects use a version of this
yaklangSkillyaklang/hack-skills/skills/crlf-injection/SKILL.md
CRLF injection playbook. Use when user input reaches HTTP response headers, Location redirects, Set-Cookie values, or log files where carriage-return/line-feed characters can split or inject content.
4 projects use a version of this
yaklangSkillyaklang/hack-skills/skills/csp-bypass-advanced/SKILL.md
Advanced Content Security Policy bypass techniques. Use when XSS or data exfiltration is blocked by CSP and you need to find policy weaknesses, trusted endpoint abuse, nonce leakage, or exfiltration channels that CSP cannot block.
3 projects use a version of this
yaklangSkillyaklang/hack-skills/skills/csrf-cross-site-request-forgery/SKILL.md
CSRF testing playbook. Use when reviewing state-changing web flows, anti-CSRF defenses, SameSite behavior, JSON CSRF, login CSRF, and OAuth state handling.
2 projects use a version of this
yaklangSkillyaklang/hack-skills/skills/csv-formula-injection/SKILL.md
CSV/spreadsheet formula injection (DDE, Excel/LibreOffice, Google Sheets IMPORT*). Use when exports, imports, or user fields feed spreadsheets or reporting tools.
2 projects use a version of this
yaklangSkillyaklang/hack-skills/skills/dangling-markup-injection/SKILL.md
Dangling markup injection playbook. Use when HTML injection is possible but JavaScript execution is blocked (CSP, sanitizer strips event handlers, WAF blocks script tags) — exfiltrate CSRF tokens, session data, and page content by injecting unclosed HTML tags that capture subsequent page content.
2 projects use a version of this
yaklangSkillyaklang/hack-skills/skills/defi-attack-patterns/SKILL.md
DeFi attack pattern playbook. Use when analyzing flash loan attacks, price oracle manipulation, MEV sandwich attacks, governance exploits, bridge vulnerabilities, and token standard edge cases in decentralized finance protocols.
2 projects use a version of this
yaklangSkillyaklang/hack-skills/skills/deserialization-insecure/SKILL.md
Insecure deserialization playbook. Use when Java, PHP, or Python applications deserialize untrusted data via ObjectInputStream, unserialize, pickle, or similar mechanisms that may lead to RCE, file access, or privilege escalation.
2 projects use a version of this
yaklangSkillyaklang/hack-skills/skills/dns-rebinding-attacks/SKILL.md
DNS rebinding attack playbook. Use when testing applications that trust DNS resolution for origin checks, interact with internal services from browser context, or when SSRF is not possible server-side but the target has client-side fetch/XHR to attacker-controlled domains.
2 projects use a version of this
yaklangSkillyaklang/hack-skills/skills/email-header-injection/SKILL.md
Email header injection and spoofing playbook. Use when testing contact forms, email APIs, password reset flows, or any feature that constructs SMTP messages with user-controlled fields. Covers CRLF injection in headers, SPF/DKIM/DMARC bypass, and phishing amplification.
3 projects use a version of this
yaklangSkillyaklang/hack-skills/skills/expression-language-injection/SKILL.md
Expression Language injection playbook. Use when Java EL, SpEL, OGNL, or MVEL expressions may evaluate attacker-controlled input in Spring, Struts2, Confluence, or similar frameworks.
2 projects use a version of this
yaklangSkillyaklang/hack-skills/skills/file-access-vuln/SKILL.md
Entry P1 category router for file access and upload workflows. Use when testing download endpoints, file paths, local file inclusion, upload flows, preview pipelines, archive extraction, or storage and sharing boundaries.
2 projects use a version of this
Plain text files in a repository that tell a coding agent how the project works: commands to run, conventions to follow and things to avoid. CLAUDE.md, AGENTS.md, cursor rules and skills are the common kinds.
CLAUDE.md is read by Claude Code. AGENTS.md is an open format that Codex, Cursor and other agents read. Many projects keep one and point the other at it.
A folder with a SKILL.md that describes one capability, such as filling PDFs or reviewing code. The agent loads it only when the task calls for it.
Your agents already can, over MCP, limited to the files you're allowed to read. Searching them from this page is coming.
