frontend_impl

frontend_impl is an agent for Claude Code from systempromptio/systemprompt-template. It costs 31 tokens per session (1,101 once invoked), scanned A, original, no licence file.

An agent that writes and fixes the visible parts of websites and web applications, including JavaScript, CSS, and HTML.

In plain words
What is it for?
Use it to implement or repair frontend features, register bundles, connect events through an event hub, and improve accessibility.
Why use it?
It helps handle frontend code while accounting for accessibility and the project's required connections between code components.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the systemprompt-dev plugin — 10 skills, 6 agents shipped together

Good fit Use it to implement or repair frontend features, register bundles, connect events through an event hub, and improve accessibility.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/systempromptio/systemprompt-template/frontend_impl
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo
git clone --depth 1 https://github.com/systempromptio/systemprompt-template

Made for: Claude Code.

Or install systemprompt-dev, the plugin that ships this one along with the rest of its 10 skills, 6 agents.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for frontend_impl

README.md
[![agentmods](https://agentmods.dev/badge/agents/systempromptio/systemprompt-template/frontend_impl/github.svg)](https://agentmods.dev/agents/systempromptio/systemprompt-template/frontend_impl)
Your own site
<a href="https://agentmods.dev/agents/systempromptio/systemprompt-template/frontend_impl"><img src="https://agentmods.dev/badge/agents/systempromptio/systemprompt-template/frontend_impl/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for frontend_impl

Your own site · 80×15
<a href="https://agentmods.dev/agents/systempromptio/systemprompt-template/frontend_impl"><img src="https://agentmods.dev/badge/agents/systempromptio/systemprompt-template/frontend_impl.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 31 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,101 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00031 $0.01101
Opus 5.5 $0.00012 $0.00440
Sonnet 5.5 $0.00006 $0.00220
Haiku 4.5 $0.00003 $0.00110

Measured 1mo ago against content hash 6f582c46212d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

frontend_impl scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

storage/files/plugins/systemprompt-dev/agents/frontend_impl.md · 118 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

Read it on GitHub

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 1mo ago First seen · 118 lines · 31 tokens per session scan A 6f582c46212d

Subscribe to this mod's changes

frontend_impl is an agent published in the GitHub repository systempromptio/systemprompt-template (29 stars, last pushed 13d ago), with no licence file. It adds 31 tokens to every session and 1,101 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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