HTTP MCP Headers
github/gh-aw
Implement secret-safe HTTP headers for MCP transport in gh-aw.
A skill your agent uses when reviewing HTTP response headers on any site that serves content over HTTPS.
MITAuto-check passed
Install Hsts
$ npx skills add thedaviddias/Front-End-Checklist --skill hsts -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install thedaviddias/Front-End-Checklist hsts --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/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/hsts .claude/skills/hsts && 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 "hsts" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/hsts into .claude/skills/hsts/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "hsts", 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/thedaviddias/Front-End-Checklist/tree/main/skills/hstsType 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 thedaviddias/Front-End-Checklist --skill hsts -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install thedaviddias/Front-End-Checklist hsts --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/hsts .agents/skills/hsts && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "hsts" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/hsts into .agents/skills/hsts/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "hsts", 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 thedaviddias/Front-End-Checklist --skill hsts -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install thedaviddias/Front-End-Checklist hsts --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/hsts .cursor/skills/hsts && 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 "hsts" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/hsts into .cursor/skills/hsts/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "hsts", 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/thedaviddias/Front-End-Checklist.git --path skills/hsts--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 thedaviddias/Front-End-Checklist --skill hsts -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install thedaviddias/Front-End-Checklist hsts --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/hsts .gemini/skills/hsts && 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 "hsts" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/hsts into .gemini/skills/hsts/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "hsts", 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 thedaviddias/Front-End-Checklist hstsInstalls 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 thedaviddias/Front-End-Checklist --skill hsts -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/hsts .github/skills/hsts && 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 "hsts" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/hsts into .github/skills/hsts/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "hsts", 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 thedaviddias/Front-End-Checklist --skill hsts -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install thedaviddias/Front-End-Checklist hsts --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/hsts .opencode/skills/hsts && 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 "hsts" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/hsts into .opencode/skills/hsts/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "hsts", 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
hsts- GitHub stars
- 74k
- Token cost
- ~496 tokens
- SKILL.md length
- 222 words
- Files
- 2 (incl. references)
- Skills in repo
- 390
- Repo updated
- First seen
- Licence
- MIT
At a glance
A skill your agent uses when reviewing HTTP response headers on any site that serves content over HTTPS.
- Reviewing HTTP response headers on any site that serves content over HTTPS
- SKILL.md covers Quick Reference, Check, Fix and Explain, plus 1 more section
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Hsts is an agent skill from thedaviddias/Front-End-Checklist. Use when reviewing HTTP response headers on any site that serves content over HTTPS.
Its SKILL.md is about 500 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including reference files (for example `references/rule.md`).
The repository describes itself as: 🗂 The essential checklist for modern web development, for humans and AI agents. The licence is MIT.
When your agent uses it
- Reviewing HTTP response headers on any site that serves content over HTTPS
Example prompts
- “/hsts”
What it can do on your machine
Read from SKILL.md and the folder at commit e8d14d0. 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
Links to these hosts (documentation or services it may open):
frontendchecklist.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.
Context cost
Hsts loads about 496 tokens when it runs, and up to ~1.9k if it reads all its reference files. Until then it costs about 22 tokens; SKILL.md has 222 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); files beside SKILL.md are not scanned.
SKILL.md
The full file from thedaviddias/Front-End-Checklist at commit e8d14d0, republished under its MIT licence (© thedaviddias). 222 words, ~496 tokens.
Download SKILL.mdSave it as
.claude/skills/hsts/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.- name
- hsts
- description
- Use when reviewing HTTP response headers on any site that serves content over HTTPS.
- metadata.category
- security
- metadata.priority
- high
- metadata.difficulty
- intermediate
- metadata.estimatedTime
- 15
- metadata.source
- frontendchecklist.io
- metadata.url
- https://frontendchecklist.io/rules/security/hsts
Set an HSTS header
Without HSTS, an attacker on the same network can intercept the first HTTP request and strip TLS (SSL stripping), silently downgrading the connection before the browser ever sees a redirect.
Quick Reference
- Set
Strict-Transport-Security: max-age=31536000; includeSubDomainson all HTTPS responses - Use
max-age=31536000(1 year) minimum; HSTS preloading requires at least 1 year - Add
includeSubDomainsto protect all subdomains from downgrade attacks - Add
preloadonly after testing — it is difficult to reverse and takes weeks to propagate - Never send the HSTS header over plain HTTP — only over HTTPS
Check
Check whether the server sends a Strict-Transport-Security header on all HTTPS responses, and verify the max-age, includeSubDomains, and preload directives are appropriate.
Fix
Add a Strict-Transport-Security header with max-age=31536000 and includeSubDomains to all HTTPS responses. Configure your web server or CDN to send this header, and validate it with curl or securityheaders.com.
Explain
Explain what HTTP Strict Transport Security (HSTS) is, how it prevents SSL stripping attacks, what the max-age and includeSubDomains directives do, and why the preload directive requires caution.
Code Review
Review server config, headers, forms, and integration points related to Set an HSTS header. Flag exact responses, cookies, or browser behaviors that violate the rule, and verify them against the effective production-like response.
For full implementation details, code examples, and framework-specific guidance,
see references/rule.md.
© thedaviddias, 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/hsts of thedaviddias/Front-End-Checklist.
- SKILL.md
- references/rule.md
Open the folder on GitHubat commit e8d14d0
Compare with similar skills
Hsts 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 |
|---|---|---|---|---|---|---|
| Hsts this skillthedaviddias/Front-End-Checklist | 74k | — | ~496 | Automated safety check: Pass | MIT | |
| HTTP MCP Headersgithub/gh-aw | 5.4k | — | ~1.2k | Automated safety check: Pass | MIT | |
| HTTP Response HandlingHKUDS/OpenSpace | 7.8k | — | ~1k | Automated safety check: Pass | MIT | |
| Checking HTTP Security Headersjeremylongshore/tons-of-skills-marketplace | 2.8k | — | ~1.6k | Automated safety check: Pass | MIT | |
| HTTP Header Security Auditjeremylongshore/tons-of-skills-marketplace | 2.8k | — | ~596 | Automated safety check: Pass | MIT | |
| Sitesasgeirtj/system_prompts_leaks | 69k | — | ~1.6k | Automated safety check: Pass | CC0-1.0 |
Similar skills
- Official
HTTP Response Handling
HKUDS/OpenSpace
Handle websites requiring JavaScript by using curl with browser headers and validating file types.
Checking HTTP Security Headers
jeremylongshore/tons-of-skills-marketplace
Audit a target's HTTP security headers — CSP, HSTS, X-Frame-Options, X-Content-Type-Options, Referrer-Policy, Permissions-Policy, and the Cross-Origin trio (COOP, COEP, CORP).
HTTP Header Security Audit
jeremylongshore/tons-of-skills-marketplace
Execute http header security audit operations. An agent skill from jeremylongshore/tons-of-skills-marketplace.
Sites
asgeirtj/system_prompts_leaks
A skill your agent uses when creating or updating a website, web app, or browser game, or when a visual layout or interactive tool would help with what the user is doing.
Responsive Design
wshobson/agents
Implement modern responsive layouts using container queries, fluid typography, CSS Grid, and mobile-first breakpoint strategies.
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Questions about Hsts
What does Hsts do?
A skill your agent uses when reviewing HTTP response headers on any site that serves content over HTTPS. Hsts is an agent skill from thedaviddias/Front-End-Checklist. Use when reviewing HTTP response headers on any site that serves content over HTTPS.
When should I use Hsts?
Hsts fits situations like: reviewing HTTP response headers on any site that serves content over HTTPS.
How do I install Hsts in Claude Code?
Run `npx skills add thedaviddias/Front-End-Checklist --skill hsts -a claude-code`. Or copy the skill folder (skills/hsts in thedaviddias/Front-End-Checklist) into .claude/skills/hsts in your project. Claude Code loads it when a task matches its description.
How do I install Hsts in Codex?
Run `npx skills add thedaviddias/Front-End-Checklist --skill hsts -a codex`. Or copy the skill folder (skills/hsts in thedaviddias/Front-End-Checklist) into .agents/skills/hsts in your project. Codex loads it when a task matches its description.
Can I use Hsts 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 thedaviddias/Front-End-Checklist --skill hsts -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/hsts, .gemini/skills/hsts, .github/skills/hsts and .opencode/skills/hsts in your project.
What does Hsts need to run?
SKILL.md names no scripts, command-line tools or credentials: Hsts is instructions for the agent only.
Does Hsts access the network?
SKILL.md names 1 domain. As links in the text: frontendchecklist.io. This is read from the text; nothing was executed.
Is Hsts 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. Review the folder before installing.
What licence does Hsts use?
Hsts 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 Hsts use?
About 496 tokens (SKILL.md is roughly 2k 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 1.4k tokens, read only when the agent opens those files.
What are the alternatives to Hsts?
Skills that share tags, products or a category with Hsts: HTTP MCP Headers (github/gh-aw, 5.4k stars), HTTP Response Handling (HKUDS/OpenSpace, 7.8k stars), Checking HTTP Security Headers (jeremylongshore/tons-of-skills-marketplace, 2.8k stars) and HTTP Header Security Audit (jeremylongshore/tons-of-skills-marketplace, 2.8k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Hsts?
thedaviddias (a GitHub user) maintains it in thedaviddias/Front-End-Checklist, which has 74,421 GitHub stars. The repository holds 390 skills in this directory. The repository was last updated on October 6, 2026.
Source: thedaviddias/Front-End-Checklist on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.