What is developer-frontend?

A frontend coding agent for implementing parts of a software feature in Svelte 5 and TypeScript. It works within the src/ directory and is called by an architect agent rather than directly by a product owner.

Use it for Svelte routes, board widgets, inspector panels, headers, notification bells, and realtime subscriptions. These are frontend pieces of a user story.

It assigns frontend implementation work to a focused agent instead of mixing it with planning or other parts of a feature. The description does not provide enough detail to say more about its behavior.

How danielterra/FOUNDATION configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to danielterra/FOUNDATION. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/danielterra/FOUNDATION/main/.claude/agents/developer-frontend.md

Clone the repo

git clone --depth 1 https://github.com/danielterra/FOUNDATION

Made for: Claude Code.

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.

README.md

[![agentmods](https://agentmods.dev/badge/agents/danielterra/foundation/developer-frontend.svg)](https://agentmods.dev/agents/danielterra/foundation/developer-frontend)

Your own site

<a href="https://agentmods.dev/agents/danielterra/foundation/developer-frontend"><img src="https://agentmods.dev/badge/agents/danielterra/foundation/developer-frontend.svg" alt="Measured on agentmods" height="20"></a>

Per session 181 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 4,895 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

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.

Model	Per session	Once invoked
Fable 5.1	$0.00181	$0.04895
Opus 5	$0.00090	$0.02448
Sonnet 5	$0.00036	$0.00979
Haiku 4.5	$0.00018	$0.00490

Measured yesterday against content hash 71a49c7ec41d, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

developer-frontend 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 yesterday.

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.

.claude/agents/developer-frontend.md · 202 lines

The source is not reproduced here

Licensed AGPL-3.0

The repository is licensed AGPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

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.

yesterday First seen · 202 lines · 181 tokens per session scan A 71a49c7ec41d

Subscribe to this mod's changes

developer-frontend is an agent published in the GitHub repository danielterra/FOUNDATION (19 stars, last pushed 1mo ago), licensed AGPL-3.0. It adds 181 tokens to every session and 4,895 once invoked, about $0.0009 per session on Opus 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 2026-09-04.

Frontend Languages TypeScript Vue and Svelte

vue-expert

Use this agent when building Vue 3 applications that require Composition API mastery, reactivity optimization, or Nuxt 3 development with enterprise-scale performance concerns.

alexmmatos/arthur-mcp · 35 tokens

typescript-specialist

Elite TypeScript/Vue specialist for production-ready applications with strict type safety, modern patterns, and test-first development. Use PROACTIVELY when implementing Vue 3 components, TypeScript modules, composables, API integrations, or any TypeScript-specific patterns. Essential for ensuring code follows…

sadjow/home-manager · 69 tokens

vue3-frontend-developer

Use this agent when you need to implement modern frontend applications using Vue3, TypeScript, and Tailwind CSS. Triggers include developing Vue PC pages, creating Vue web applications, building Vue3 projects, implementing Vue components, converting designs to Vue code, building dashboards, creating admin panels…

joneqian/claude-skills-suite · 79 tokens

FOUNDATION: Agent for Claude Code