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Agent skill

Ttfb

by thedaviddias in thedaviddias/Front-End-Checklist

A skill your agent uses when auditing slow first responses on SSR pages, APIs, or cacheable HTML.

MITAuto-check passed

Install Ttfb

skills CLI
$ npx skills add thedaviddias/Front-End-Checklist --skill ttfb -a claude-code

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

GitHub CLI
$ gh skill install thedaviddias/Front-End-Checklist ttfb --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/ttfb .claude/skills/ttfb && 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
ttfb
GitHub stars
74k
Token cost
~406 tokens
SKILL.md length
166 words
Files
2 (incl. references)
Skills in repo
390
Repo updated
First seen
Licence
MIT

At a glance

A skill your agent uses when auditing slow first responses on SSR pages, APIs, or cacheable HTML.

  • Auditing slow first responses on SSR pages
  • 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

Ttfb is an agent skill from thedaviddias/Front-End-Checklist. Use when auditing slow first responses on SSR pages, APIs, or cacheable HTML. Distinguish origin compute time from network latency and CDN cache misses before proposing a fix.

Its SKILL.md is about 410 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

  • Auditing slow first responses on SSR pages

Example prompts

  • “/ttfb”

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

Ttfb loads about 406 tokens when it runs, and up to ~1.1k if it reads all its reference files. Until then it costs about 45 tokens; SKILL.md has 166 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~45
When it runs · the whole SKILL.md, loaded when a task matches
~406
With references · SKILL.md plus every file in references/, read only if the agent opens them
~1.1k

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). 166 words, ~406 tokens.

Download SKILL.mdSave it as .claude/skills/ttfb/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.
name
ttfb
description
Use when auditing slow first responses on SSR pages, APIs, or cacheable HTML. Distinguish origin compute time from network latency and CDN cache misses before proposing a fix.
metadata.category
performance
metadata.priority
medium
metadata.difficulty
intermediate
metadata.estimatedTime
10
metadata.source
frontendchecklist.io
metadata.url
https://frontendchecklist.io/rules/performance/ttfb

Reduce Time to First Byte (TTFB)

TTFB is the foundation of page performance; if the server is slow to respond, all subsequent loading stages are delayed.

Quick Reference

  • Optimize server-side logic and database queries to speed up response generation
  • Use a Content Delivery Network (CDN) to serve content closer to users
  • Implement effective caching strategies at the server and edge levels

Check

Review the page's TTFB and identify any bottlenecks in the server-side processing or network transmission.

Fix

Optimize the server's response time by improving database queries, caching responses, and using a CDN.

Explain

Explain how TTFB impacts the entire page load process and why it is a critical starting point for performance optimization.

Code Review

Review server-rendered routes, API handlers, cache configuration, and database access on the critical path. Flag uncached HTML, slow synchronous work before the first byte, repeated upstream fetches, or expensive queries that keep TTFB above roughly 800ms.

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

Rule page: https://frontendchecklist.io/rules/performance/ttfb

© 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/ttfb of thedaviddias/Front-End-Checklist.

  • SKILL.md
  • references/rule.md

Open the folder on GitHubat commit e8d14d0

Compare with similar skills

Ttfb 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.

Ttfb compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Ttfb this skillthedaviddias/Front-End-Checklist74k—~406Automated safety check: PassMIT
Ponytail AuditDietrichGebert/ponytail159k—~1.4kAutomated safety check: PassMIT
Production Auditaffaan-m/ECC276k1 repos~1.9kAutomated safety check: PassMIT
Aims Auditalirezarezvani/claude-skills28k—~1.3kAutomated safety check: PassMIT
Investigate Slow Upstream Responsesblotcms/blot2k—~3.6kAutomated safety check: PassAGPL-3.0
Geo Auditsickn33/agentic-awesome-skills47k1 repos~3.4kAutomated safety check: NotesMIT

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    affaan-m/ECC

    Local-evidence production readiness audit for shipped apps, pre-launch reviews, post-merge checks, and "what breaks in prod?" questions without sending repo data to an external audit service.

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  • Content Freshness Signals

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  • Geo Meta Tags Audit

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Questions about Ttfb

What does Ttfb do?

A skill your agent uses when auditing slow first responses on SSR pages, APIs, or cacheable HTML. Ttfb is an agent skill from thedaviddias/Front-End-Checklist. Use when auditing slow first responses on SSR pages, APIs, or cacheable HTML.

When should I use Ttfb?

Ttfb fits situations like: auditing slow first responses on SSR pages.

How do I install Ttfb in Claude Code?

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

How do I install Ttfb in Codex?

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

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

What does Ttfb need to run?

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

Does Ttfb 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 Ttfb 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 Ttfb use?

Ttfb 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 Ttfb use?

About 406 tokens (SKILL.md is roughly 1.6k 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 692 tokens, read only when the agent opens those files.

What are the alternatives to Ttfb?

Skills that share tags, products or a category with Ttfb: Ponytail Audit (DietrichGebert/ponytail, 159k stars), Production Audit (affaan-m/ECC, 276k stars), Aims Audit (alirezarezvani/claude-skills, 28k stars) and Investigate Slow Upstream Responses (blotcms/blot, 2k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Ttfb?

thedaviddias (a GitHub user) maintains it in thedaviddias/Front-End-Checklist, which has 74,412 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.