frontend-to-backend-requirements

frontend-to-backend-requirements is a skill for Claude Code, Codex from softaworks/agent-toolkit. It costs 54 tokens per session (1,310 once invoked), scanned A, original, MIT.

A guide for frontend developers to describe the data, user actions, rules, and error states a screen needs from a backend. The backend is the server-side part of an application that supplies data and handles actions.

In plain words
What is it for?
Use it to write backend requirements for a new screen or feature, including what the UI must display and how it should handle different states.
Why use it?
It makes frontend needs clear without forcing backend developers to follow a particular API design.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to write backend requirements for a new screen or feature, including what the UI must display and how it should handle different states.

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Install with agentmods
npx agentmods add skills/softaworks/agent-toolkit/frontend-to-backend-requirements
About the project

Softaworks Agent Toolkit is a collection of packaged instructions, scripts, agents, and commands that give AI coding assistants reusable procedures for development, documentation, planning, and professional work. Developers install its components individually in compatible coding-agent environments; catalogue entries represent parts of this toolkit.

softaworks/agent-toolkit · 2,446 stars · on GitHub

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.

Any agent
npx skills add softaworks/agent-toolkit --skill frontend-to-backend-requirements
Clone the repo
git clone --depth 1 https://github.com/softaworks/agent-toolkit

Made for: Claude Code, Codex.

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-to-backend-requirements

README.md
[![agentmods](https://agentmods.dev/badge/skills/softaworks/agent-toolkit/frontend-to-backend-requirements/github.svg)](https://agentmods.dev/skills/softaworks/agent-toolkit/frontend-to-backend-requirements)
Your own site
<a href="https://agentmods.dev/skills/softaworks/agent-toolkit/frontend-to-backend-requirements"><img src="https://agentmods.dev/badge/skills/softaworks/agent-toolkit/frontend-to-backend-requirements/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-to-backend-requirements

Your own site · 80×15
<a href="https://agentmods.dev/skills/softaworks/agent-toolkit/frontend-to-backend-requirements"><img src="https://agentmods.dev/badge/skills/softaworks/agent-toolkit/frontend-to-backend-requirements.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 54 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,310 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. Third-party audits
  • Socket pass 21 Aug 2026
  • Snyk pass 21 Aug 2026
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
Origin original 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 $0.00054 $0.01310
Opus 5 $0.00027 $0.00655
Sonnet 5 $0.00011 $0.00262
Haiku 4.5 $0.00005 $0.00131

Measured 9d ago against content hash d29acfeac522, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

frontend-to-backend-requirements 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 9d 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.

skills/frontend-to-backend-requirements/SKILL.md · 194 lines

How it starts

The opening of the file, as written. The whole thing — 194 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Backend Requirements Mode

You are a frontend developer documenting what data you need from backend. You describe the what, not the how. Backend owns implementation details.

No Chat Output: ALL responses go to .claude/docs/ai/<feature-name>/backend-requirements.md No Implementation Details: Don't specify endpoints, field names, or API structure—that's backend's call.


The Point

This mode is for frontend devs to communicate data needs:

  • What data do I need to render this screen?
  • What actions should the user be able to perform?
  • What business rules affect the UI?
  • What states and errors should I handle?

You're requesting, not demanding. Backend may push back, suggest alternatives, or ask clarifying questions. That's healthy collaboration.


What You Own vs. What Backend Owns

Frontend Owns Backend Owns
What data is needed How data is structured
What actions exist Endpoint design
UI states to handle Field names, types
User-facing validation API conventions
Display requirements Performance/caching

Workflow

Step 1: Describe the Feature

Before listing requirements:

  1. What is this? — Screen, flow, component
  2. Who uses it? — User type, permissions
  3. What's the goal? — What does success look like?

Step 2: List Data Needs

For each screen/component, describe:

Data I need to display:

  • What information appears on screen?
  • What's the relationship between pieces?
  • What determines visibility/state?

Actions user can perform:

  • What can the user do?
  • What's the expected outcome?
  • What feedback should they see?

States I need to handle:

  • Loading, empty, error, success
  • Edge cases (partial data, expired, etc.)

Step 3: Surface Uncertainties

List what you're unsure about:

  • Business rules you don't fully understand
  • Edge cases you're not sure how to handle
  • Places where you're guessing

These invite backend to clarify or push back.

Read the full file on GitHub · 194 lines

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 9d ago First seen · 194 lines · 54 tokens per session scan A d29acfeac522

Subscribe to this mod's changes

frontend-to-backend-requirements is a skill published in the GitHub repository softaworks/agent-toolkit (2,446 stars, last pushed 6mo ago), licensed MIT. It adds 54 tokens to every session and 1,310 once invoked, about $0.0003 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 2026-08-30.

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