Codememory Mark Constraint
harrylettering/CodeMemory
A skill your agent uses to durably record a hard constraint or invariant that the work must respect.
A skill your agent uses when optimising Largest Contentful Paint (LCP), reducing render-blocking resource contention, or fine-tuning resource loading order in the critical rendering path.
Install Fetchpriority Attribute
$ npx skills add thedaviddias/Front-End-Checklist --skill fetchpriority-attribute -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install thedaviddias/Front-End-Checklist fetchpriority-attribute --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/fetchpriority-attribute .claude/skills/fetchpriority-attribute && 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 "fetchpriority-attribute" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/fetchpriority-attribute into .claude/skills/fetchpriority-attribute/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "fetchpriority-attribute", 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/fetchpriority-attributeType 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 fetchpriority-attribute -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install thedaviddias/Front-End-Checklist fetchpriority-attribute --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/fetchpriority-attribute .agents/skills/fetchpriority-attribute && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "fetchpriority-attribute" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/fetchpriority-attribute into .agents/skills/fetchpriority-attribute/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "fetchpriority-attribute", 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 fetchpriority-attribute -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install thedaviddias/Front-End-Checklist fetchpriority-attribute --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/fetchpriority-attribute .cursor/skills/fetchpriority-attribute && 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 "fetchpriority-attribute" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/fetchpriority-attribute into .cursor/skills/fetchpriority-attribute/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "fetchpriority-attribute", 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/fetchpriority-attribute--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 fetchpriority-attribute -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install thedaviddias/Front-End-Checklist fetchpriority-attribute --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/fetchpriority-attribute .gemini/skills/fetchpriority-attribute && 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 "fetchpriority-attribute" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/fetchpriority-attribute into .gemini/skills/fetchpriority-attribute/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "fetchpriority-attribute", 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 fetchpriority-attributeInstalls 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 fetchpriority-attribute -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/fetchpriority-attribute .github/skills/fetchpriority-attribute && 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 "fetchpriority-attribute" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/fetchpriority-attribute into .github/skills/fetchpriority-attribute/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "fetchpriority-attribute", 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 fetchpriority-attribute -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 fetchpriority-attribute --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/fetchpriority-attribute .opencode/skills/fetchpriority-attribute && 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 "fetchpriority-attribute" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/fetchpriority-attribute into .opencode/skills/fetchpriority-attribute/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "fetchpriority-attribute", 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
fetchpriority-attribute- GitHub stars
- 74k
- Token cost
- ~535 tokens
- SKILL.md length
- 223 words
- Files
- 2 (incl. references)
- Skills in repo
- 390
- Repo updated
- First seen
- Licence
- MIT
At a glance
A skill your agent uses when optimising Largest Contentful Paint (LCP), reducing render-blocking resource contention, or fine-tuning resource loading order in the critical rendering path.
- Optimising Largest Contentful Paint (LCP)
- 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
- Reducing render-blocking resource contention
What it does
Fetchpriority Attribute is an agent skill from thedaviddias/Front-End-Checklist. Use when optimising Largest Contentful Paint (LCP), reducing render-blocking resource contention, or fine-tuning resource loading order in the critical rendering path.
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`).
It sits in AI & LLM Engineering, covering Web performance and Fine-tuning. It works with Contentful. 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
- Optimising Largest Contentful Paint (LCP)
- Reducing render-blocking resource contention
- Fine-tuning resource loading order in the critical rendering path
Example prompts
- “/fetchpriority-attribute”
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
Fetchpriority Attribute loads about 535 tokens when it runs, and up to ~2.1k if it reads all its reference files. Until then it costs about 48 tokens; SKILL.md has 223 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). 223 words, ~535 tokens.
Download SKILL.mdSave it as
.claude/skills/fetchpriority-attribute/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.- name
- fetchpriority-attribute
- description
- Use when optimising Largest Contentful Paint (LCP), reducing render-blocking resource contention, or fine-tuning resource loading order in the critical rendering path.
- metadata.category
- performance
- metadata.priority
- medium
- metadata.difficulty
- beginner
- metadata.estimatedTime
- 15
- metadata.source
- frontendchecklist.io
- metadata.url
- https://frontendchecklist.io/rules/performance/fetchpriority-attribute
Use fetchpriority to hint resource loading priority
Browsers use internal heuristics to guess resource priority, but they cannot know which image is your LCP candidate. Adding fetchpriority="high" to the LCP image has been shown to reduce LCP by 5–30 % in real-world tests, directly improving Core Web Vitals scores and user-perceived load speed. The attribute costs nothing to add and is the lowest-effort high-impact performance optimisation available today.
Quick Reference
- Add fetchpriority="high" to the LCP image to accelerate Largest Contentful Paint
- Add fetchpriority="low" to below-the-fold images that would otherwise compete with critical resources
- Use fetchpriority="high" on
<link rel="preload">for critical fonts and CSS - Avoid marking more than one or two resources as high priority — it defeats the purpose
Check
Check whether the LCP image or hero element has fetchpriority="high" and whether any high-priority preload links are missing the attribute.
Fix
Add fetchpriority="high" to the LCP image element and any preloaded critical resources, and fetchpriority="low" to non-critical below-the-fold images.
Explain
Explain how the browser's resource priority queue works and how fetchpriority hints change loading order to improve LCP.
Code Review
Review the HTML for images above the fold. Flag the LCP candidate if it lacks fetchpriority="high", and flag any carousel or below-fold images that lack fetchpriority="low" (they compete with critical resources).
For full implementation details, code examples, and framework-specific guidance,
see references/rule.md.
Rule page: https://frontendchecklist.io/rules/performance/fetchpriority-attribute
© 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/fetchpriority-attribute of thedaviddias/Front-End-Checklist.
- SKILL.md
- references/rule.md
Open the folder on GitHubat commit e8d14d0
Compare with similar skills
Fetchpriority Attribute 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 |
|---|---|---|---|---|---|---|
| Fetchpriority Attribute this skillthedaviddias/Front-End-Checklist | 74k | — | ~535 | Automated safety check: Pass | MIT | |
| Codememory Mark Constraintharrylettering/CodeMemory | 158 | — | ~793 | Automated safety check: Pass | None | |
| Core Web Vitalstheopenco/llmgateway | 1.7k | — | ~955 | Automated safety check: Pass | Custom licence | |
| Performance ProfilerEliasOulkadi/shokunin | 114 | — | ~2.7k | Automated safety check: Notes | MIT | |
| Algo SEO Technicalasgard-ai-platform/skills | 241 | — | ~1k | Automated safety check: Pass | MIT | |
| Core Web Vitalskostja94/marketing-skills | 1k | — | ~1.2k | Automated safety check: Pass | MIT |
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Related
Works with
Categories
Questions about Fetchpriority Attribute
What does Fetchpriority Attribute do?
A skill your agent uses when optimising Largest Contentful Paint (LCP), reducing render-blocking resource contention, or fine-tuning resource loading order in the critical rendering path. Fetchpriority Attribute is an agent skill from thedaviddias/Front-End-Checklist. Use when optimising Largest Contentful Paint (LCP), reducing render-blocking resource contention, or fine-tuning resource loading order in the critical rendering path.
When should I use Fetchpriority Attribute?
Fetchpriority Attribute fits situations like: optimising Largest Contentful Paint (LCP); reducing render-blocking resource contention; fine-tuning resource loading order in the critical rendering path.
How do I install Fetchpriority Attribute in Claude Code?
Run `npx skills add thedaviddias/Front-End-Checklist --skill fetchpriority-attribute -a claude-code`. Or copy the skill folder (skills/fetchpriority-attribute in thedaviddias/Front-End-Checklist) into .claude/skills/fetchpriority-attribute in your project. Claude Code loads it when a task matches its description.
How do I install Fetchpriority Attribute in Codex?
Run `npx skills add thedaviddias/Front-End-Checklist --skill fetchpriority-attribute -a codex`. Or copy the skill folder (skills/fetchpriority-attribute in thedaviddias/Front-End-Checklist) into .agents/skills/fetchpriority-attribute in your project. Codex loads it when a task matches its description.
Can I use Fetchpriority Attribute 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 fetchpriority-attribute -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/fetchpriority-attribute, .gemini/skills/fetchpriority-attribute, .github/skills/fetchpriority-attribute and .opencode/skills/fetchpriority-attribute in your project.
What does Fetchpriority Attribute need to run?
SKILL.md names no scripts, command-line tools or credentials: Fetchpriority Attribute is instructions for the agent only.
Does Fetchpriority Attribute 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 Fetchpriority Attribute 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 Fetchpriority Attribute use?
Fetchpriority Attribute 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 Fetchpriority Attribute use?
About 535 tokens (SKILL.md is roughly 2.1k 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 1.5k tokens, read only when the agent opens those files.
What are the alternatives to Fetchpriority Attribute?
Skills that share tags, products or a category with Fetchpriority Attribute: Codememory Mark Constraint (harrylettering/CodeMemory, 158 stars), Core Web Vitals (theopenco/llmgateway, 1.7k stars), Performance Profiler (EliasOulkadi/shokunin, 114 stars) and Algo SEO Technical (asgard-ai-platform/skills, 241 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Fetchpriority Attribute?
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.