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backend

backend is a skill for Claude Code from telagod/code-abyss. It costs 99 tokens per session (431 once invoked), scanned A, original, MIT.

A reference for making server-side engineering decisions about programming languages, databases, queues, APIs, data models, architecture, security, and operations.

In plain words
What is it for?
Use it when choosing a backend stack, designing services or schemas, planning migrations, reviewing business logic, or preparing a system to run reliably.
Why use it?
It helps evaluate backend choices and exposes design risks before they become production problems.

Skill for Claude Code

Written for Claude Code: user-invocable in frontmatter.

Part of the code-abyss plugin — 39 skills shipped together

not rated 245repo 3mo ago A scan SkillSpector: pass 99 tokens original MIT

Good fit Use it when choosing a backend stack, designing services or schemas, planning migrations, reviewing business logic, or preparing a system to run reliably.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/telagod/code-abyss/backend
View source ↗ telagod/code-abyss npmjs.com
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 telagod/code-abyss --skill backend
Clone the repo
git clone --depth 1 https://github.com/telagod/code-abyss

Made for: Claude Code.

Or install code-abyss, the plugin that ships this one along with the rest of its 39 skills.

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/telagod/code-abyss/backend/github.svg)](https://agentmods.dev/skills/telagod/code-abyss/backend)
Your own site
<a href="https://agentmods.dev/skills/telagod/code-abyss/backend"><img src="https://agentmods.dev/badge/skills/telagod/code-abyss/backend/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

Your own site · 80×15
<a href="https://agentmods.dev/skills/telagod/code-abyss/backend"><img src="https://agentmods.dev/badge/skills/telagod/code-abyss/backend.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 99 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 431 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
  • 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 $0.00099 $0.00431
Opus 5.5 $0.00040 $0.00172
Sonnet 5.5 $0.00020 $0.00086
Haiku 4.5 $0.00010 $0.00043

Measured 2mo ago against content hash 17346d86fe5f, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, 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 2mo 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/_kernel/backend/SKILL.md · 36 lines

What it actually says

Backend — stack, logic, data, operations, rot

Rule content lives in the five files below; this SKILL.md only routes (doctrine/04-maintenance.md governs edits to this bundle too).

Route by moment

You are about to… Read (in this folder)
Pick a language / framework / DB / queue / architecture, or judge a stack proposal stack.md
Design or review a service, module, API, or piece of business logic logic.md
Design a schema, transaction, migration, or cache data.md
Ship to production — observability, config, failure modes, security, jobs, limits operate.md
Review existing code, plan a refactor, or explain why a codebase feels dangerous rot.md

Starting a new system usually means stack.md → logic.md → data.md, in that order: stack only after the scenario interrogation, endpoints only after the data model.

Scope and neighbors

Server-side engineering judgment only. Whether to delegate and when to escalate → doctrine; how to investigate/verify anything → methods; the visual/UI layer → frontend.

The stance

The one test governing the whole bundle is logic.md's opening line — is change still cheap and safe — and rot.md's opening defines the failure mode and the ugly-but-safe tiebreak. Read those two openings before judging any backend.

Files

What ships with it

5 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. 2mo ago First seen · 36 lines · 99 tokens per session scan A 17346d86fe5f

Subscribe to this mod's changes

backend is a skill published in the GitHub repository telagod/code-abyss (245 stars, last pushed 3mo ago), licensed MIT. It adds 99 tokens to every session and 431 once invoked, about $0.0004 per session on Opus 5.5. 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.

Backend and APIsClaude Codeai-assistantblue-teamclicodex-cliconfiguration
Related

backend compared with skills from other repositories

backend next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
backendtelagod/code-abyssSkill2453mo agoMITA99Claude Code
kirby-debugging-and-tracingbnomei/kirby-mcpSkill6919d agoMITA45Claude Code, Codex
kirby-forms-and-frontend-actionsbnomei/kirby-mcpSkill6919d agoMITA43Claude Code, Codex
kirby-plugin-developmentbnomei/kirby-mcpSkill6919d agoMITA37Claude Code, Codex
kirby-routing-and-representationsbnomei/kirby-mcpSkill6919d agoMITA50Claude Code, Codex
kirby-scaffold-page-typebnomei/kirby-mcpSkill6919d agoMITA48Claude Code, Codex
kirby-headless-apibnomei/kirby-mcpSkill6919d agoMITA41Claude Code, Codex