agentmods.dev

backend-building

backend-building is a skill for Claude Code, Codex from serejaris/kimi-skills. It costs 71 tokens per session (3,360 once invoked), scanned A, original, MIT.

A backend add-on for an existing webapp-building frontend. It adds server routes, database support, authentication, and APIs using tRPC, Drizzle, Hono, MySQL, and OAuth 2.0.

In plain words
What is it for?
Use it to add a database, API endpoints, authentication, and user management to a project already created with webapp-building.
Why use it?
It supplies the server-side parts a frontend needs to store data, expose API operations, and manage user sign-in. It is designed to add these parts without replacing the existing frontend files.

Skill for Claude CodeCodex

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

Needs its repository: it runs a file that does not travel with it, so clone the repository first. The line is bash /app/.agents/skills/webapp-building/scripts/init-webapp.sh "My App".

not rated 6repo 1mo ago A scan 71 tokens original MIT

Good fit Use it to add a database, API endpoints, authentication, and user management to a project already created with webapp-building.

Compare 6 skills from other repositories ↓
View source ↗ serejaris/kimi-skills
Install

Getting it into your agent

It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.

Clone the repo
git clone --depth 1 https://github.com/serejaris/kimi-skills
agentmods
npx agentmods add skills/serejaris/kimi-skills/backend-building

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 backend-building

README.md
[![agentmods](https://agentmods.dev/badge/skills/serejaris/kimi-skills/backend-building/github.svg)](https://agentmods.dev/skills/serejaris/kimi-skills/backend-building)
Your own site
<a href="https://agentmods.dev/skills/serejaris/kimi-skills/backend-building"><img src="https://agentmods.dev/badge/skills/serejaris/kimi-skills/backend-building/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 backend-building

Your own site · 80×15
<a href="https://agentmods.dev/skills/serejaris/kimi-skills/backend-building"><img src="https://agentmods.dev/badge/skills/serejaris/kimi-skills/backend-building.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 71 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,360 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 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 $0.00071 $0.03360
Opus 5 $0.00036 $0.01680
Sonnet 5 $0.00014 $0.00672
Haiku 4.5 $0.00007 $0.00336

Measured 12d ago against content hash 0b50635dbd5f, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

backend-building 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 12d ago.

The scan reads SKILL.md. This mod also ships 37 executable files (scripts/.prepare-template.sh, scripts/init.sh, scripts/lib/merge-package-json.mjs, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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/backend-building/SKILL.md · 275 lines

How it starts

The opening of the file, as written. The whole thing — 275 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Backend Building

Stack: tRPC + Drizzle ORM + Hono + MySQL + OAuth 2.0

A backend-only skill that grafts onto an existing webapp-building project. It adds api/, contracts/ directories and optionally db/ — but never replaces or modifies existing frontend files.

Prerequisite: An existing project created by webapp-building.

Features

Features can be installed incrementally. Base infrastructure (Hono server, tRPC, contracts) is always installed automatically on first run.

Feature What it provides Dependencies
db Drizzle ORM + MySQL — adds db/, api/queries/connection.ts, drizzle.config.ts —
auth Kimi OAuth + user management — adds api/kimi/, Login page, useAuth, AuthLayout requires db (auto-included)

Default: init.sh "App" with no --features → defaults to auth (= db + auth), preserving backward compat.

Workflows

Frontend-first (recommended when UI is already built):

  1. webapp-building init → develop UI pages and components
  2. backend-building graft (this skill) — auto-wires tRPC providers and routes
  3. Verify with npm run check, then add tRPC routers, database tables, wire frontend to API

Full-stack from scratch (recommended when backend is needed immediately):

  1. webapp-building init → immediately graft backend-building
  2. Verify with npm run check
  3. Develop frontend and backend together

Incremental features (add capabilities over time):

  1. Start with --features db for database only
  2. Later add auth: init.sh "App" --features auth

Quick Start

1. Initialize Frontend First (webapp-building)

bash /app/.agents/skills/webapp-building/scripts/init-webapp.sh "My App"
cd /mnt/agents/output/app

2. Graft Backend

# Full stack with auth (default, same as before):
bash /app/.agents/skills/backend-building/scripts/init.sh "My App"

# Database only (no auth):
bash /app/.agents/skills/backend-building/scripts/init.sh "My App" --features db

# Add auth later:
bash /app/.agents/skills/backend-building/scripts/init.sh "My App" --features auth

Read the full file on GitHub · 275 lines

Files

What ships with it

60 files 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. 12d ago First seen · 275 lines · 71 tokens per session scan A 0b50635dbd5f

Subscribe to this mod's changes

backend-building is a skill published in the GitHub repository serejaris/kimi-skills (6 stars, last pushed 1mo ago), licensed MIT. It adds 71 tokens to every session and 3,360 once invoked, about $0.0004 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 2026-08-31.

Backend and APIsDatabasesagent-skillsai-agentsclaude-skillskimimoonshotskills
Related

Other skills, from other repositories

go-database

Use when writing, reviewing, or debugging Go code that talks to a SQL database (PostgreSQL, MySQL, MariaDB, SQLite). Covers library choice (database/sql, sqlx, sqlc, pgx, GORM trade-offs), parameterized queries, context propagation, NULL handling, scanning, transactions and isolation, connection pool tuning, and…

muratmirgun/gophers · 98 tokens

backend-setup-stack

Bootstraps a local Node.js backend development stack with Docker, PostgreSQL, and an ORM (Prisma or Sequelize). Use this skill whenever the user wants to: initialize a new backend project, set up a Dockerized database locally, wire up an ORM with automated migrations, scaffold an Express server with a health endpoint…

WESTsyre21/setup-backend-stack · 155 tokens

backend-setup-stack

Use this skill when the user wants to initialize a local development environment using Docker, PostgreSQL, an npm server, and an ORM (Prisma/Sequelize) with automated migration workflows, including detection of existing migration metadata and database readiness checks.

WESTsyre21/setup-backend-stack · 54 tokens

supabase

Use when doing ANY task involving Supabase. Triggers: Supabase products (Database, Auth, Edge Functions, Realtime, Storage, Vectors, Cron, Queues); client libraries and SSR integrations (supabase-js, @supabase/ssr) in Next.js, React, SvelteKit, Astro, Remix; auth issues (login, logout, sessions, JWT, cookies…

supabase/agent-skills · 185 tokens

offensive-api-abuse

Advanced API exploitation methodology focused on business logic abuse and sophisticated attack patterns that bypass traditional security controls. Covers business logic bypass through API call chaining and workflow manipulation. Addresses GraphQL-specific attacks including batching for credential brute-force, query…

SnailSploit/Claude-Red · 184 tokens

nestjs

Provides comprehensive NestJS framework patterns with Drizzle ORM integration for building scalable server-side applications. Generates REST/GraphQL APIs, implements authentication guards, creates database schemas, and sets up microservices. Use when building NestJS applications, setting up APIs, implementing…

giuseppe-trisciuoglio/developer-kit · 65 tokens