f5-backend

f5-backend is a command for coding agents from Fujigo-Software/f5-framework-claude. It costs 3 tokens per session (992 once invoked), scanned A, original, MIT.

A set of commands for creating common backend code in NestJS, FastAPI, or Spring Boot. Backend code runs on a server and handles data, business rules, authentication, and web requests.

In plain words
What is it for?
Use it to generate modules, services, controllers, authentication guards, validation data objects, database entities, routers, models, schemas, and repositories.
Why use it?
It reduces the need to write repeated server-side file structures by hand. It also adapts the available commands to the backend technology selected for the project.

Command

Part of the f5-core plugin — 46 commands, 10 agents shipped together

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.

agentmods
npx agentmods add commands/fujigo-software/f5-framework-claude/f5-backend
Clone the repo
git clone --depth 1 https://github.com/Fujigo-Software/f5-framework-claude

Or install f5-core, the plugin that ships this one along with the rest of its 46 commands, 10 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 f5-backend

README.md
[![agentmods](https://agentmods.dev/badge/commands/fujigo-software/f5-framework-claude/f5-backend.svg)](https://agentmods.dev/commands/fujigo-software/f5-framework-claude/f5-backend)
Your own site
<a href="https://agentmods.dev/commands/fujigo-software/f5-framework-claude/f5-backend"><img src="https://agentmods.dev/badge/commands/fujigo-software/f5-framework-claude/f5-backend.svg" alt="Measured on agentmods" height="20"></a>
Per session 3 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 992 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00003 $0.00992
Opus 5 $0.00002 $0.00496
Sonnet 5 $0.00001 $0.00198
Haiku 4.5 $0.00000 $0.00099

Measured 5d ago against content hash e8804184b462, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

f5-backend 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 5d 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.

plugins/f5-core/commands/f5-backend.md · 160 lines

How it starts

The opening of the file, as written. The whole thing — 160 lines — stays where its author put it; the contents beside it link to each section on GitHub.

/f5-backend - Backend Development Assistant

Hỗ trợ phát triển backend theo stack đã chọn trong project.

ARGUMENTS

The user's request is: $ARGUMENTS

DETECT BACKEND STACK

# Auto-detect from .f5/config.json
STACK=$(jq -r '.stack.backend // "nestjs"' .f5/config.json 2>/dev/null)

STACK-SPECIFIC COMMANDS

NestJS (Default)

Command Description
module <name> Generate NestJS module with CRUD
service <name> Generate service with repository pattern
controller <name> Generate REST controller
guard <name> Generate auth guard
dto <name> Generate DTO with validation
entity <name> Generate Prisma/TypeORM entity

FastAPI (Python)

Command Description
router <name> Generate FastAPI router
service <name> Generate service class
model <name> Generate Pydantic model
schema <name> Generate SQLAlchemy schema

Spring Boot (Java)

Command Description
controller <name> Generate REST controller
service <name> Generate service with interface
repository <name> Generate JPA repository
entity <name> Generate JPA entity
dto <name> Generate DTO with MapStruct

Go (Gin)

Command Description
handler <name> Generate Gin handler
service <name> Generate service layer
repository <name> Generate GORM repository
model <name> Generate Go struct

Django (Python)

Command Description
app <name> Create Django app
model <name> Generate Django model
view <name> Generate DRF viewset
serializer <name> Generate DRF serializer

Laravel (PHP)

Command Description
controller <name> Generate controller
model <name> Generate Eloquent model
migration <name> Generate migration
resource <name> Generate API resource

Read the full file on GitHub · 160 lines

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. 5d ago First seen · 160 lines · 3 tokens per session scan A e8804184b462

Subscribe to this mod's changes

f5-backend is a command published in the GitHub repository Fujigo-Software/f5-framework-claude (24 stars, last pushed 7mo ago), licensed MIT. It adds 3 tokens to every session and 992 once invoked, about $0.0000 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.