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Agent skill

Back Forward Cache

by thedaviddias in thedaviddias/Front-End-Checklist

A skill your agent uses when reviewing navigation performance, browser lifecycle events, or resume-from-memory behavior.

MITAuto-check passed

Install Back Forward Cache

skills CLI
$ npx skills add thedaviddias/Front-End-Checklist --skill back-forward-cache -a claude-code

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

GitHub CLI
$ gh skill install thedaviddias/Front-End-Checklist back-forward-cache --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/back-forward-cache .claude/skills/back-forward-cache && 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
back-forward-cache
GitHub stars
74k
Token cost
~541 tokens
SKILL.md length
232 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 navigation performance, browser lifecycle events, or resume-from-memory behavior.

  • Reviewing navigation performance
  • 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
  • Browser lifecycle events

What it does

Back Forward Cache is an agent skill from thedaviddias/Front-End-Checklist. Use when reviewing navigation performance, browser lifecycle events, or resume-from-memory behavior. Check the actual browser lifecycle and restore path, not only static code patterns.

Its SKILL.md is about 540 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 navigation performance
  • Browser lifecycle events
  • Resume-from-memory behavior

Example prompts

  • “/back-forward-cache”

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

Back Forward Cache loads about 541 tokens when it runs, and up to ~1.8k if it reads all its reference files. Until then it costs about 51 tokens; SKILL.md has 232 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~51
When it runs · the whole SKILL.md, loaded when a task matches
~541
With references · SKILL.md plus every file in references/, read only if the agent opens them
~1.8k

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). 232 words, ~541 tokens.

Download SKILL.mdSave it as .claude/skills/back-forward-cache/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.
name
back-forward-cache
description
Use when reviewing navigation performance, browser lifecycle events, or resume-from-memory behavior. Check the actual browser lifecycle and restore path, not only static code patterns.
metadata.category
performance
metadata.priority
high
metadata.difficulty
advanced
metadata.estimatedTime
25
metadata.source
frontendchecklist.io
metadata.url
https://frontendchecklist.io/rules/performance/back-forward-cache

Optimize pages for back/forward cache

Back/forward cache turns many browser back and forward navigations into near-instant restores because the entire page is resumed from memory instead of being rebuilt from the network. Losing bfcache eligibility makes common navigations feel far slower than they need to.

Quick Reference

  • Never add an unload listener - it is the most common bfcache blocker
  • Use pagehide and pageshow instead of assuming every navigation reloads
  • Refresh time-sensitive state when pageshow.persisted is true
  • Keep beforeunload conditional and remove it when there are no unsaved changes
  • Verify eligibility in DevTools instead of assuming a page is cacheable

Check

Review this route for back/forward cache blockers. Search for unload or unconditional beforeunload listeners, state that assumes every navigation is a full reload, and resource lifecycles that break when the page is resumed from memory.

Fix

Replace unload logic with pagehide and pageshow handlers, remove unnecessary blockers, and refresh only the time-sensitive state that must change after a bfcache restore.

Explain

Explain how the back/forward cache differs from HTTP caching, why unload blocks it, and how pageshow/pagehide should be used instead.

Code Review

Review route code, global listeners, analytics hooks, and data-refresh logic related to Optimize pages for back/forward cache. Flag exact listeners, APIs, or lifecycle assumptions that prevent a restore or leave stale state after a restore.

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

Rule page: https://frontendchecklist.io/rules/performance/back-forward-cache

© 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/back-forward-cache of thedaviddias/Front-End-Checklist.

  • SKILL.md
  • references/rule.md

Open the folder on GitHubat commit e8d14d0

Compare with similar skills

Back Forward Cache 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.

Back Forward Cache compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Back Forward Cache this skillthedaviddias/Front-End-Checklist74k—~541Automated safety check: PassMIT
Prompt Cachingdavila7/claude-code-templates32k6 repos~452Automated safety check: PassMIT
Turborepo Cachingwshobson/agents40k9 repos~2kAutomated safety check: NotesMIT
OmniRoute LLM Cachediegosouzapw/OmniRoute74k1 repos~529Automated safety check: PassMIT
Cachingzebbern/claude-code-guide4.7k—~1.5kAutomated safety check: PassMIT
Navigation EventrosuH/EasyWatermark1.9k1 repos~3.3kAutomated safety check: PassMIT

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Questions about Back Forward Cache

What does Back Forward Cache do?

A skill your agent uses when reviewing navigation performance, browser lifecycle events, or resume-from-memory behavior. Back Forward Cache is an agent skill from thedaviddias/Front-End-Checklist. Use when reviewing navigation performance, browser lifecycle events, or resume-from-memory behavior.

When should I use Back Forward Cache?

Back Forward Cache fits situations like: reviewing navigation performance; browser lifecycle events; resume-from-memory behavior.

How do I install Back Forward Cache in Claude Code?

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

How do I install Back Forward Cache in Codex?

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

Can I use Back Forward Cache 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 back-forward-cache -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/back-forward-cache, .gemini/skills/back-forward-cache, .github/skills/back-forward-cache and .opencode/skills/back-forward-cache in your project.

What does Back Forward Cache need to run?

SKILL.md names no scripts, command-line tools or credentials: Back Forward Cache is instructions for the agent only.

Does Back Forward Cache 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 Back Forward Cache 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 Back Forward Cache use?

Back Forward Cache 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 Back Forward Cache use?

About 541 tokens (SKILL.md is roughly 2.2k 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 1.3k tokens, read only when the agent opens those files.

What are the alternatives to Back Forward Cache?

Skills that share tags, products or a category with Back Forward Cache: Prompt Caching (davila7/claude-code-templates, 32k stars), Turborepo Caching (wshobson/agents, 40k stars), OmniRoute LLM Cache (diegosouzapw/OmniRoute, 74k stars) and Caching (zebbern/claude-code-guide, 4.7k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Back Forward Cache?

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.