backend

backend is a skill for Claude Code, Codex from Adelie-Squad/solosquad. It costs 34 tokens per session (508 once invoked), scanned A, original, MIT.

A set of guidelines for building server-side application logic and API endpoints, the interfaces software uses to exchange data.

In plain words
What is it for?
Use it for business rules, REST or GraphQL APIs, database schemas and migrations, external API connections, caching, and backend performance work.
Why use it?
It helps structure backend changes and requires checks such as comparing implementation approaches, testing, security review, and architecture review when relevant.

Skill for Claude CodeCodex

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 skills/adelie-squad/solosquad/backend
Any agent
npx skills add Adelie-Squad/solosquad --skill backend
Clone the repo
git clone --depth 1 https://github.com/Adelie-Squad/solosquad

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

README.md
[![agentmods](https://agentmods.dev/badge/skills/adelie-squad/solosquad/backend.svg)](https://agentmods.dev/skills/adelie-squad/solosquad/backend)
Your own site
<a href="https://agentmods.dev/skills/adelie-squad/solosquad/backend"><img src="https://agentmods.dev/badge/skills/adelie-squad/solosquad/backend.svg" alt="Measured on agentmods" height="20"></a>
Per session 34 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 508 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 $0.00034 $0.00508
Opus 5 $0.00017 $0.00254
Sonnet 5 $0.00007 $0.00102
Haiku 4.5 $0.00003 $0.00051

Measured 5d ago against content hash 2a4d0110620c, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

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.

agents/specialists/backend/SKILL.md · 69 lines

What it actually says

Backend Engineer — v1.1 (merged)

R&R

담당 범위

  • 서버 로직 / business rules
  • REST / GraphQL endpoint 설계·구현
  • DB schema + migration
  • 외부 API integration
  • 백엔드 성능 / 캐싱

담당하지 않는 것

  • 시스템 디자인 / ADR → system-architect
  • 사용자 대면 flow → frontend
  • 데이터 파이프라인 / ETL → data-engineer
  • 보안 audit → security

v1.1 병합 노트

backend-developer (서버 로직) + api-developer (API endpoint) 통합. 두 SKILL의 R&R 80% overlap, codebase 영역 동일.

HARD GATE: PR ship 조건

- [ ] ≥ 2 approaches 비교 (e.g. transaction boundary / index strategy)
- [ ] verify skill 통과
- [ ] qa test coverage 유지
- [ ] security 검토 (auth/data 변경 시)
- [ ] system-architect 검토 (cross-service 변경 시)

Reference

  • 이전: assets/agents/engineering/{backend-developer, api-developer}/SKILL.md
  • v1.1 PRD §8.1 (병합 정당화), §6.4
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 · 69 lines · 34 tokens per session scan A 2a4d0110620c

Subscribe to this mod's changes

backend is a skill published in the GitHub repository Adelie-Squad/solosquad (19 stars, last pushed 14d ago), licensed MIT. It adds 34 tokens to every session and 508 once invoked, about $0.0002 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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