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Agent skill

Session Cookie Flags

by thedaviddias in thedaviddias/Front-End-Checklist

A skill your agent uses when reviewing server-side session management, setting up authentication middleware, or auditing cookie configuration in HTTP response headers.

MITAuto-check passedBackend & APIs

Install Session Cookie Flags

skills CLI
$ npx skills add thedaviddias/Front-End-Checklist --skill session-cookie-flags -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install thedaviddias/Front-End-Checklist session-cookie-flags --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/session-cookie-flags .claude/skills/session-cookie-flags && rm -rf skills-src

Use ~/.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/

Facts

Skill name
session-cookie-flags
GitHub stars
74k
Token cost
~486 tokens
SKILL.md length
210 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 server-side session management, setting up authentication middleware, or auditing cookie configuration in HTTP response headers.

  • Reviewing server-side session management
  • 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
  • Setting up authentication middleware

What it does

Session Cookie Flags is an agent skill from thedaviddias/Front-End-Checklist. Use when reviewing server-side session management, setting up authentication middleware, or auditing cookie configuration in HTTP response headers.

Its SKILL.md is about 490 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`).

It sits in Backend & APIs, covering Authentication and Backend development. 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 server-side session management
  • Setting up authentication middleware
  • Auditing cookie configuration in HTTP response headers

Example prompts

  • “/session-cookie-flags”

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

Session Cookie Flags loads about 486 tokens when it runs, and up to ~2.2k if it reads all its reference files. Until then it costs about 42 tokens; SKILL.md has 210 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~42
When it runs · the whole SKILL.md, loaded when a task matches
~486
With references · SKILL.md plus every file in references/, read only if the agent opens them
~2.2k

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). 210 words, ~486 tokens.

Download SKILL.mdSave it as .claude/skills/session-cookie-flags/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.
name
session-cookie-flags
description
Use when reviewing server-side session management, setting up authentication middleware, or auditing cookie configuration in HTTP response headers.
metadata.category
security
metadata.priority
high
metadata.difficulty
beginner
metadata.estimatedTime
15
metadata.source
frontendchecklist.io
metadata.url
https://frontendchecklist.io/rules/security/session-cookie-flags

Set Secure, HttpOnly, and SameSite flags on session cookies

Missing cookie flags are one of the most common and easily fixed authentication weaknesses. Without Secure, session tokens are transmitted in plain text over HTTP and can be captured by network eavesdroppers. Without HttpOnly, any XSS payload can exfiltrate the session token in one line. Without SameSite, any website can trigger authenticated actions on behalf of the victim without their knowledge.

Quick Reference

  • Secure — cookie is only sent over HTTPS, never plain HTTP
  • HttpOnly — cookie is invisible to JavaScript (blocks XSS theft)
  • SameSite=Strict or Lax — prevents the cookie from being sent on cross-site requests (blocks CSRF)
  • Never use SameSite=None without also setting Secure and understanding the CSRF implications

Check

Check whether session and authentication cookies are set with the Secure, HttpOnly, and SameSite flags.

Fix

Update the server's cookie configuration to include Secure, HttpOnly, and SameSite=Strict (or Lax) on all session and auth cookies.

Explain

Explain what each cookie security flag does and the specific attack each one prevents.

Code Review

Review all Set-Cookie headers and cookie creation code. Flag any cookies missing the HttpOnly flag, absent Secure flag, or an unspecified or overly permissive SameSite setting.

For full implementation details, code examples, and framework-specific guidance, see references/rule.md.

Rule page: https://frontendchecklist.io/rules/security/session-cookie-flags

© 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/session-cookie-flags of thedaviddias/Front-End-Checklist.

  • SKILL.md
  • references/rule.md

Open the folder on GitHubat commit e8d14d0

Compare with similar skills

Session Cookie Flags 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.

Session Cookie Flags compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Session Cookie Flags this skillthedaviddias/Front-End-Checklist74k—~486Automated safety check: PassMIT
Fortify Developmentcoollabsio/coolify63k4 repos~1.9kAutomated safety check: PassMIT
Laravel SpecialistJeffallan/claude-skills12k1 repos~2.1kAutomated safety check: PassMIT
Socialite Developmenthexlet-volunteers/hexlet-sicp1145 repos~1.2kAutomated safety check: PassMIT
Passport Developmenttrypostit/trypost678—~1.9kAutomated safety check: PassMIT
Spa Auth Developmentgdarko/laravel-vue-starter145—~668Automated safety check: NotesMIT

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Categories

Questions about Session Cookie Flags

What does Session Cookie Flags do?

A skill your agent uses when reviewing server-side session management, setting up authentication middleware, or auditing cookie configuration in HTTP response headers. Session Cookie Flags is an agent skill from thedaviddias/Front-End-Checklist. Use when reviewing server-side session management, setting up authentication middleware, or auditing cookie configuration in HTTP response headers.

When should I use Session Cookie Flags?

Session Cookie Flags fits situations like: reviewing server-side session management; setting up authentication middleware; auditing cookie configuration in HTTP response headers.

How do I install Session Cookie Flags in Claude Code?

Run `npx skills add thedaviddias/Front-End-Checklist --skill session-cookie-flags -a claude-code`. Or copy the skill folder (skills/session-cookie-flags in thedaviddias/Front-End-Checklist) into .claude/skills/session-cookie-flags in your project. Claude Code loads it when a task matches its description.

How do I install Session Cookie Flags in Codex?

Run `npx skills add thedaviddias/Front-End-Checklist --skill session-cookie-flags -a codex`. Or copy the skill folder (skills/session-cookie-flags in thedaviddias/Front-End-Checklist) into .agents/skills/session-cookie-flags in your project. Codex loads it when a task matches its description.

Can I use Session Cookie Flags 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 session-cookie-flags -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/session-cookie-flags, .gemini/skills/session-cookie-flags, .github/skills/session-cookie-flags and .opencode/skills/session-cookie-flags in your project.

What does Session Cookie Flags need to run?

SKILL.md names no scripts, command-line tools or credentials: Session Cookie Flags is instructions for the agent only.

Does Session Cookie Flags 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 Session Cookie Flags 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 Session Cookie Flags use?

Session Cookie Flags 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 Session Cookie Flags use?

About 486 tokens (SKILL.md is roughly 1.9k 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 1.7k tokens, read only when the agent opens those files.

What are the alternatives to Session Cookie Flags?

Skills that share tags, products or a category with Session Cookie Flags: Fortify Development (coollabsio/coolify, 63k stars), Laravel Specialist (Jeffallan/claude-skills, 12k stars), Socialite Development (hexlet-volunteers/hexlet-sicp, 114 stars) and Passport Development (trypostit/trypost, 678 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Session Cookie Flags?

thedaviddias (a GitHub user) maintains it in thedaviddias/Front-End-Checklist, which has 74,398 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.