Backend and APIs

24,034 mods in this category, of every kind an agent can take. Each one carries what it costs per session, what the scan found, and whether it is the original.

spider-king

169

aoyunyang/spider-king-skill

Skill Claude CodeCodex

Pure-web protocol reverse skill: turn hostile browser clients into browser-free Python collectors. Auto-judge intake and tool path from signals: artifact-only first when samples suffice; for a fresh web live-target, collect sequential fingerprint-baseline then debugger-trace evidence (default chrome-devtools then…

not rated 469 +14 changed yesterday A 163 tokens original MIT

marcoturi/fastify-boilerplate

Instructions file CodexOpenCode

AGENTS.md instructions for marcoturi/fastify-boilerplate, covering agents.md, project overview, quick reference, architecture and layer boundaries (critical).

not rated 464 +2 today A 2,747 tokens original MIT

api2cli

171

alexknowshtml/api2cli

Skill Claude CodeCodex

Generate a working CLI from any API, then wrap it in a Claude Code skill. Point it at API docs, a live URL, or a peek-api capture and get a dual-mode Commander.js CLI (human + agent output) plus a ready-to-use skill folder. Use when user wants to wrap an API in a CLI, generate a CLI from API docs, turn an API into a…

not rated 451 6mo ago A 101 tokens original MIT

memmesh-sdk

172

ThinkfleetAI/memmesh

Skill Claude CodeCodex

MemMesh TypeScript SDK reference (@thinkfleet/memory-sdk) for the hosted platform at app.memmesh.ai. Covers the ThinkFleetMemory client — observe / search / list, the predict + lattice prediction surface, closed-loop learning (recordDecision / recordOutcome), emergent behavior discovery, and the health / financial…

not rated 441 +1 10d ago A 176 tokens original Apache-2.0

aropan/clist

Skill Claude CodeCodex

Use when adding or fixing a batch Django management command under src/ranking/management/commands/ — wiring addarguments, the CLIST command skeleton (AttrDict(options), getLogger, printsqldecorator), the EventLog/failedonexception monitoring idiom, Resource.get() host filtering, or wiring a cron entry with a…

not rated 440 20d ago A 106 tokens original Apache-2.0

firebase

174

firebase/agent-skills

Plugin Claude Code

Bundles 12 skills, 1 MCP server · 859 tokens together

Official Claude plugin for Firebase. Manage projects, add backend services, develop AI features, deploy & host apps, and more.

not rated 434 +4 2d ago A tokens not measured original Apache-2.0

OnlyTerp/UltraCode-Shim

Instructions file CodexOpenCode

Instructions for OnlyTerp/UltraCode-Shim, covering runbook for ai assistants, phase 0 — understand the goal (read once), phase 1 — prerequisites, phase 2 — get the code + baseline check and mac/linux/wsl.

not rated 425 +3 13d ago C 2,489 tokens original MIT

mcp-tool

176

mondaycom/mcp

Command Claude Code

Guide for developing monday.com platform API tools in the agent-toolkit package. Use when creating, modifying, or debugging tools in packages/agent-toolkit/src/core/tools/platform-api-tools/, working with GraphQL queries, or adding new MCP tools to the toolkit.

not rated 422 +1 yesterday A 0 tokens original MIT

notion

177

Arvo-AI/aurora

Skill Claude CodeCodex

Notion workspace integration for searching pages, managing databases, creating postmortems, and exporting RCA findings.

not rated 404 +3 today A 23 tokens original Apache-2.0

KarmaCircle AGENTS.md

178

karmacircleCommunity/KarmaCircle

Instructions file CodexOpenCode

AGENTS.md instructions for karmacircleCommunity/KarmaCircle, covering agentic workflow, git / branching, the apps/web ↔ apps/api boundary, repo-specific guardrails and when you're not sure which duplicate a request means.

not rated 396 2d ago A 1,466 tokens original MIT

add-entity

179

SSWConsulting/SSW.VerticalSliceArchitecture

Skill Claude CodeCodex

Scaffold a new domain entity or aggregate in this Vertical Slice Architecture template — the entity itself, its strongly typed ID, errors, specification, EF Core configuration, DbSet, the mandatory Vogen registration, and the migration. Use when the user says "add an entity", "add an aggregate", "create a domain…

not rated 396 +1 29d ago A 116 tokens original MIT

MARS

180

andrea-magni/MARS

Plugin Claude Code

Bundles 3 skills · 446 tokens together

Agent Skills for MARS-Curiosity, the Delphi REST library: scaffold new MARS server projects, develop REST APIs with resources, attributes, JWT authentication, FireDAC, server-sent events, WebStencils, client components and deployment, and build MCP servers exposing Delphi tools to AI agents.

not rated 394 15d ago A tokens not measured original MPL-2.0

aws-serverless-eda

181

Microck/ordinary-claude-skills

Skill Claude CodeCodex

AWS serverless and event-driven architecture expert based on Well-Architected Framework. Use when building serverless APIs, Lambda functions, REST APIs, microservices, or async workflows. Covers Lambda with TypeScript/Python, API Gateway (REST/HTTP), DynamoDB, Step Functions, EventBridge, SQS, SNS, and serverless…

not rated 394 +2 2mo ago A 112 tokens

resend-cli

182

resend/resend-cli

Skill Claude CodeCodex

Operate the Resend platform from the terminal — send emails (including React Email .tsx templates via --react-email), manage domains, contacts, broadcasts, templates, webhooks, API keys, logs, automations, and events via the resend CLI. Use when the user wants to run Resend commands in the shell, scripts, or CI/CD…

not rated 392 changed today A 114 tokens original MIT

api-gateway

183

CraftOS-dev/CraftBot

Skill Claude CodeCodex

Connect to 100+ APIs (Google Workspace, Microsoft 365, Notion, Slack, Airtable, HubSpot, etc.) with managed OAuth. Use this skill when users want to interact with external services. Security: The MATONAPIKEY authenticates with Maton.ai but grants NO access to third-party services by itself. Each service requires…

not rated 378 2d ago A 108 tokens original MIT

claude-api

184

JrCx7scC/claude-code-source

Skill Claude CodeCodex

This skill helps you build LLM-powered applications with Claude. Choose the right surface based on your needs, detect the project language, then read the relevant language-specific documentation.

not rated 376 5mo ago A 0 tokens

linejs

185

evex-dev/linejs

Skill Claude CodeCodex

Helps a coding agent build LINE bots / clients with the @evex/linejs library — JSR package, Deno-first, runs on Node/Bun too. Use when the user asks to write LINE bots, automate LINE accounts, work with LINE Thrift APIs, or wrap the AI "Agent I" feature.

not rated 375 +1 7d ago A 71 tokens original MIT

tae0y/real-estate-mcp

Instructions file

Instructions for tae0y/real-estate-mcp, covering claude.md, project overview, commands, run a single test file and run a single test by name.

not rated 373 1mo ago A 1,480 tokens original MIT

project-context

187

labsai/EDDI

Cursor rule Cursor

EDDI Backend — AI Agent Instructions. Complete project context, architecture, and coding guidelines.

not rated 372 today A 45 tokens original Apache-2.0

opengovsg/FormSG

Instructions file GitHub Copilot

Copilot instructions for opengovsg/FormSG, covering formsg development instructions, 🎯 quick reference, common development commands, starting services and start all services (frontend + backend + lambdas).

not rated 371 today A 4,954 tokens

fastapi-templates

189

ModelEngine-Group/DataMate

Skill Claude CodeCodex

Create production-ready FastAPI projects with async patterns, dependency injection, and comprehensive error handling. Use when building new FastAPI applications or setting up backend API projects.

not rated 368 9d ago A 37 tokens original MIT

anthropics/anthropic-sdk-ruby

Instructions file ✓ vendor

Claude Code instructions for anthropics/anthropic-sdk-ruby, covering working in this repository, build, test, lint, types and signatures, code organization and errors.

not rated 366 today A 5,195 tokens original MIT

capability-governance

191

ArtisanCloud/PowerX

Skill Claude CodeCodex

PowerX 底座 Capability 治理与发布准入规则。用于审计 REST/OpenAPI/gRPC/Gin 生成的能力候选、正式 platformcapabilities 目录、Capability Registry 登记、agentusable/permissioncode/risklevel 元数据、ignore 清单和缺失能力;当用户要求“重新识别能力”“能力是否能发布”“补齐能力登记”“检查 capability-gen/audit/check”“底座接口暴露给插件/agent”时使用。.

not rated 364 4d ago A 109 tokens original Apache-2.0

aws-serverless-eda

192

zxkane/aws-skills

Skill Claude CodeCodex

AWS serverless and event-driven architecture expert based on Well-Architected Framework. Use when building serverless APIs, Lambda functions, REST APIs, microservices, or async workflows. Covers Lambda with TypeScript/Python, API Gateway (REST/HTTP), DynamoDB, Step Functions, EventBridge, SQS, SNS, and serverless…

not rated 360 +3 2mo ago A 112 tokens copy · 86% MIT

At most 3 mods per repository are shown here, and a mod shipped inside a plugin is left to that plugin's page — the rest are on their repository pages: