Security Audit
TheDecipherist/claude-code-mastery
Checks a codebase for hardcoded secrets, vulnerable dependencies, weak input handling, weak authentication and unsafe transport settings before deployment or merge.
Agent skill
Analyzing Security Headers
by jeremylongshore in jeremylongshore/tons-of-skills-marketplace
Analyze HTTP security headers of web domains to identify vulnerabilities and misconfigurations.
Install Analyzing Security Headers
$ npx skills add jeremylongshore/tons-of-skills-marketplace --skill analyzing-security-headers -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install jeremylongshore/tons-of-skills-marketplace analyzing-security-headers --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/jeremylongshore/tons-of-skills-marketplace.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/.curated/analyzing-security-headers .claude/skills/analyzing-security-headers && 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 "analyzing-security-headers" agent skill from https://github.com/jeremylongshore/tons-of-skills-marketplace/tree/main/skills/.curated/analyzing-security-headers into .claude/skills/analyzing-security-headers/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "analyzing-security-headers", 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/jeremylongshore/tons-of-skills-marketplace/tree/main/skills/.curated/analyzing-security-headersType 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 jeremylongshore/tons-of-skills-marketplace --skill analyzing-security-headers -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install jeremylongshore/tons-of-skills-marketplace analyzing-security-headers --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/jeremylongshore/tons-of-skills-marketplace.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/.curated/analyzing-security-headers .agents/skills/analyzing-security-headers && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "analyzing-security-headers" agent skill from https://github.com/jeremylongshore/tons-of-skills-marketplace/tree/main/skills/.curated/analyzing-security-headers into .agents/skills/analyzing-security-headers/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "analyzing-security-headers", 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 jeremylongshore/tons-of-skills-marketplace --skill analyzing-security-headers -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install jeremylongshore/tons-of-skills-marketplace analyzing-security-headers --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/jeremylongshore/tons-of-skills-marketplace.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/.curated/analyzing-security-headers .cursor/skills/analyzing-security-headers && 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 "analyzing-security-headers" agent skill from https://github.com/jeremylongshore/tons-of-skills-marketplace/tree/main/skills/.curated/analyzing-security-headers into .cursor/skills/analyzing-security-headers/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "analyzing-security-headers", 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/jeremylongshore/tons-of-skills-marketplace.git --path skills/.curated/analyzing-security-headers--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 jeremylongshore/tons-of-skills-marketplace --skill analyzing-security-headers -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install jeremylongshore/tons-of-skills-marketplace analyzing-security-headers --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/jeremylongshore/tons-of-skills-marketplace.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/.curated/analyzing-security-headers .gemini/skills/analyzing-security-headers && 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 "analyzing-security-headers" agent skill from https://github.com/jeremylongshore/tons-of-skills-marketplace/tree/main/skills/.curated/analyzing-security-headers into .gemini/skills/analyzing-security-headers/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "analyzing-security-headers", 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 jeremylongshore/tons-of-skills-marketplace analyzing-security-headersInstalls 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 jeremylongshore/tons-of-skills-marketplace --skill analyzing-security-headers -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/jeremylongshore/tons-of-skills-marketplace.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/.curated/analyzing-security-headers .github/skills/analyzing-security-headers && 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 "analyzing-security-headers" agent skill from https://github.com/jeremylongshore/tons-of-skills-marketplace/tree/main/skills/.curated/analyzing-security-headers into .github/skills/analyzing-security-headers/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "analyzing-security-headers", 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 jeremylongshore/tons-of-skills-marketplace --skill analyzing-security-headers -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install jeremylongshore/tons-of-skills-marketplace analyzing-security-headers --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/jeremylongshore/tons-of-skills-marketplace.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/.curated/analyzing-security-headers .opencode/skills/analyzing-security-headers && 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 "analyzing-security-headers" agent skill from https://github.com/jeremylongshore/tons-of-skills-marketplace/tree/main/skills/.curated/analyzing-security-headers into .opencode/skills/analyzing-security-headers/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "analyzing-security-headers", 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
analyzing-security-headers- GitHub stars
- 2.8k
- Token cost
- ~1.2k tokens
- SKILL.md length
- 465 words
- Files
- 9 (incl. scripts, references, assets)
- Skills in repo
- 3,342
- Repo updated
- First seen
- Licence
- MIT
At a glance
Analyze HTTP security headers of web domains to identify vulnerabilities and misconfigurations.
- Works in 8 steps: Accept the target domain. If only a… → Fetch response headers using WebFetch… → Evaluate critical headers -- flag any… → …
- You need to audit website security headers
- SKILL.md covers Overview, Prerequisites, Instructions and Output, plus 3 more sections
- Runs Python scripts from its folder; reaches tonsofskills.com
What it does
Analyzing Security Headers is an agent skill from jeremylongshore/tons-of-skills-marketplace. Analyze HTTP security headers of web domains to identify vulnerabilities and misconfigurations. Use when you need to audit website security headers, assess header compliance, or get security recommendations for web applications. Trigger with phrases like "analyze security headers", "check HTTP headers", "audit website security headers", or "evaluate CSP and HSTS configuration".
Its SKILL.md is about 1.2k tokens, which your agent loads only when the skill is triggered. The skill folder holds 11 other files, including scripts, reference files and assets (for example `assets/README.md`, `references/README.md` and `references/errors.md`). Compatibility notes: Designed for Claude Code
It sits in Security, covering Secure coding. The repository describes itself as: Model-agnostic agent-skills platform with a harness-free canonical layer, verified adapters, and the ccpi package manager. Explore at tonsofskills.com. The licence is MIT.
When your agent uses it
- You need to audit website security headers
- Assess header compliance
- Get security recommendations for web applications
- With phrases like analyze security headers
Example prompts
- “analyze security headers”
- “check HTTP headers”
- “audit website security headers”
- “/analyzing-security-headers”
Requirements
- Python 3
- Compatibility (from SKILL.md): Designed for Claude Code
- Pre-approved tools (allowed-tools): Read, WebFetch, WebSearch, Grep
Workflow steps
8 steps, taken from the first numbered list in SKILL.md.
- Accept the target domain. If only a domain name is provided, default to https://. For batch analysis, accept a newline-separated list.
- Fetch response headers using WebFetch for both HTTP and HTTPS endpoints. Record the full redirect chain and final destination URL.
- Evaluate critical headers -- flag any that are missing or misconfigured
- Evaluate important headers -- report status and recommendations
- Check for information disclosure -- flag Server, X-Powered-By, X-AspNet-Version, and any header revealing technology stack or version…
- Inspect cookie attributes on Set-Cookie headers: verify Secure, HttpOnly, SameSite=Lax|Strict, and Host-/Secure- prefix usage.
- Calculate a security grade: A+ (95-100), A (85-94), B (75-84), C (65-74), D (50-64), F (<50) based on weighted presence and correctness of…
- Generate per-header remediation directives with configuration examples for Nginx, Apache, and Cloudflare.
What it can do on your machine
Read from SKILL.md and the folder at commit 80f86df. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves these tools, so the agent can use them without asking each time:
ReadWebFetchWebSearchGrep
From allowed-tools in the SKILL.md frontmatter.
Runs code
Ships 3 files in scripts/ (Python), which the agent can run.
From the folder's file list and the shell code blocks in SKILL.md.
Network
Hosts in commands or code, which the agent is likely to contact:
tonsofskills.com
Also links to:
owasp.orgdeveloper.mozilla.orgsecurityheaders.comcontent-security-policy.comhstspreload.orgintentsolutions.io
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.
Compatibility
Designed for Claude Code
From compatibility in the SKILL.md frontmatter.
Context cost
Analyzing Security Headers loads about 1.2k tokens when it runs, and up to ~2.1k if it reads all its reference files. Until then it costs about 102 tokens; SKILL.md has 465 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 passed
The automated check found no risky patterns in SKILL.md.
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); the scripts in this folder are not scanned.
SKILL.md
The full file from jeremylongshore/tons-of-skills-marketplace at commit 80f86df, republished under its MIT licence (© jeremylongshore). 465 words, ~1,241 tokens.
Download SKILL.mdSave it as
.claude/skills/analyzing-security-headers/SKILL.md (or your agent's skills folder). This skill also uses 8 other files; get the full folder from GitHub.- name
- analyzing-security-headers
- description
- Analyze HTTP security headers of web domains to identify vulnerabilities and misconfigurations. Use when you need to audit website security headers, assess header compliance, or get security recommendations for web applications. Trigger with phrases like "analyze security headers", "check HTTP headers", "audit website security headers", or "evaluate CSP and HSTS configuration".
- allowed-tools
- Read, WebFetch, WebSearch, Grep
- compatibility
- Designed for Claude Code
- version
- 1.28.0
- author
- Jeremy Longshore <jeremy@intentsolutions.io>
- license
- MIT
- tags
- security, compliance, audit
Analyzing Security Headers
Overview
Evaluate HTTP response headers for web applications against OWASP Secure Headers Project recommendations and browser security baselines. Identify missing, misconfigured, or information-leaking headers across both HTTP and HTTPS responses.
Prerequisites
- Target URL or domain name accessible over the network
- Authorization to perform HTTP requests against the target domain
- Network connectivity for both HTTP and HTTPS protocols
- Optional: write access to
${CLAUDE_SKILL_DIR}/security-reports/for persisting results
Instructions
- Accept the target domain. If only a domain name is provided, default to
https://. For batch analysis, accept a newline-separated list. - Fetch response headers using
WebFetchfor both HTTP and HTTPS endpoints. Record the full redirect chain and final destination URL. - Evaluate critical headers -- flag any that are missing or misconfigured:
Strict-Transport-Security: requiremax-age>=31536000,includeSubDomains, and preload eligibilityContent-Security-Policy: check forunsafe-inline,unsafe-eval, overly broaddefault-src, and missingframe-ancestorsX-Frame-Options: requireDENYorSAMEORIGINX-Content-Type-Options: requirenosniffPermissions-Policy: verify camera, microphone, geolocation restrictions
- Evaluate important headers -- report status and recommendations:
Referrer-Policy: recommendstrict-origin-when-cross-originorno-referrerCross-Origin-Embedder-Policy(COEP),Cross-Origin-Opener-Policy(COOP),Cross-Origin-Resource-Policy(CORP)
- Check for information disclosure -- flag
Server,X-Powered-By,X-AspNet-Version, and any header revealing technology stack or version numbers. - Inspect cookie attributes on
Set-Cookieheaders: verifySecure,HttpOnly,SameSite=Lax|Strict, and__Host-/__Secure-prefix usage. - Calculate a security grade: A+ (95-100), A (85-94), B (75-84), C (65-74), D (50-64), F (<50) based on weighted presence and correctness of each header.
- Generate per-header remediation directives with configuration examples for Nginx, Apache, and Cloudflare.
See ${CLAUDE_SKILL_DIR}/references/implementation.md for the five-phase implementation workflow.
Output
- Headers Analysis Report: overall grade, per-header status (present/missing/misconfigured), and risk impact
- Remediation Checklist: prioritized fixes with server configuration snippets
- Cookie Security Assessment: attribute compliance for each
Set-Cookieheader - Comparison Table: side-by-side HTTP vs. HTTPS header differences
Show full SKILL.md (175 more words)Show less
Error Handling
| Error | Cause | Solution |
|---|---|---|
| Failed to connect to domain | DNS resolution failure, firewall block, or domain down | Verify domain spelling and DNS records; test alternate protocols |
| SSL certificate verification failed | Expired, self-signed, or mismatched certificate | Note TLS issue in report; indicates HSTS not properly enforced |
| Too many redirects | Redirect loop between HTTP and HTTPS | Report the redirect chain and analyze headers at each hop |
| HTTP 429 Too Many Requests | Rate limiting by target server | Implement backoff; queue domain for delayed re-analysis |
| Headers differ between HTTP and HTTPS | Inconsistent server configuration | Report both sets; highlight critical differences and flag HSTS gap |
Examples
- "Analyze security headers for
https://tonsofskills.comand explain any CSP or HSTS issues." - "Check headers for
example.comon both HTTP and HTTPS and provide an Nginx remediation config." - "Batch-analyze headers for five staging domains and rank them by security grade."
Resources
- OWASP Secure Headers Project: https://owasp.org/www-project-secure-headers/
- MDN Security Headers Guide: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers#security
- Security Headers Scanner: https://securityheaders.com/
- Content Security Policy Reference: https://content-security-policy.com/
- HSTS Preload Submission: https://hstspreload.org/
${CLAUDE_SKILL_DIR}/references/errors.md-- full error handling reference${CLAUDE_SKILL_DIR}/references/examples.md-- additional usage examples- https://intentsolutions.io
© jeremylongshore, 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 8 other files (scripts, references, assets) in skills/.curated/analyzing-security-headers of jeremylongshore/tons-of-skills-marketplace.
- SKILL.md
- assets/README.md
- references/README.md
- references/errors.md
- references/examples.md
- references/implementation.md
- scripts/README.md
- scripts/analyze_headers.py
- scripts/generate_report.py
Open the folder on GitHubat commit 80f86df
Compare with similar skills
Analyzing Security Headers 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 |
|---|---|---|---|---|---|---|
| Analyzing Security Headers this skilljeremylongshore/tons-of-skills-marketplace | 2.8k | — | ~1.2k | Automated safety check: Pass | MIT | |
| Security AuditTheDecipherist/claude-code-mastery | 550 | — | ~1.3k | Automated safety check: Notes | MIT | |
| Humble Header Report Analystrfc-st/humble | 379 | — | ~3.7k | Automated safety check: Pass | MIT | |
| Pre-Commit Security Scanzereight/gitlab-mcp | 2k | 1 repos | ~859 | Automated safety check: Notes | MIT | |
| Defense In Depthsandgardenhq/sgai | 137 | 3 repos | ~970 | Automated safety check: Pass | Custom licence | |
| Kesekit Guidecdppcorp/KESE-KIT | 361 | — | ~1.4k | Automated safety check: Pass | MIT |
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Related
Categories
Questions about Analyzing Security Headers
What does Analyzing Security Headers do?
Analyze HTTP security headers of web domains to identify vulnerabilities and misconfigurations. Analyzing Security Headers is an agent skill from jeremylongshore/tons-of-skills-marketplace. Analyze HTTP security headers of web domains to identify vulnerabilities and misconfigurations.
When should I use Analyzing Security Headers?
Analyzing Security Headers fits situations like: you need to audit website security headers; assess header compliance; get security recommendations for web applications; with phrases like analyze security headers.
How do I install Analyzing Security Headers in Claude Code?
Run `npx skills add jeremylongshore/tons-of-skills-marketplace --skill analyzing-security-headers -a claude-code`. Or copy the skill folder (skills/.curated/analyzing-security-headers in jeremylongshore/tons-of-skills-marketplace) into .claude/skills/analyzing-security-headers in your project. Claude Code loads it when a task matches its description.
How do I install Analyzing Security Headers in Codex?
Run `npx skills add jeremylongshore/tons-of-skills-marketplace --skill analyzing-security-headers -a codex`. Or copy the skill folder (skills/.curated/analyzing-security-headers in jeremylongshore/tons-of-skills-marketplace) into .agents/skills/analyzing-security-headers in your project. Codex loads it when a task matches its description.
Can I use Analyzing Security Headers 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 jeremylongshore/tons-of-skills-marketplace --skill analyzing-security-headers -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/analyzing-security-headers, .gemini/skills/analyzing-security-headers, .github/skills/analyzing-security-headers and .opencode/skills/analyzing-security-headers in your project.
What does Analyzing Security Headers need to run?
Going by SKILL.md and its folder, Analyzing Security Headers needs Python for the scripts in its folder. Our summary lists: Python 3. Its frontmatter pre-approves these tools: Read, WebFetch, WebSearch, Grep. Compatibility (from SKILL.md): Designed for Claude Code.
Does Analyzing Security Headers access the network?
SKILL.md names 7 domains. In commands or code: tonsofskills.com; the agent is likely to contact it when it follows the instructions. As links in the text: owasp.org, developer.mozilla.org, securityheaders.com, content-security-policy.com, hstspreload.org and intentsolutions.io. This is read from the text; nothing was executed.
Is Analyzing Security Headers safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.
What licence does Analyzing Security Headers use?
Analyzing Security Headers is published under the MIT licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Analyzing Security Headers use?
About 1.2k tokens (SKILL.md is roughly 5k 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 909 tokens, read only when the agent opens those files.
What are the alternatives to Analyzing Security Headers?
Skills that share tags, products or a category with Analyzing Security Headers: Security Audit (TheDecipherist/claude-code-mastery, 550 stars), Humble Header Report Analyst (rfc-st/humble, 379 stars), Pre-Commit Security Scan (zereight/gitlab-mcp, 2k stars) and Defense In Depth (sandgardenhq/sgai, 137 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Analyzing Security Headers?
jeremylongshore (a GitHub user) maintains it in jeremylongshore/tons-of-skills-marketplace, which has 2,825 GitHub stars. The repository holds 3,342 skills in this directory. The repository was last updated on October 9, 2026.
Source: jeremylongshore/tons-of-skills-marketplace on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.