Backend and APIs skills

13,240 tagged Backend and APIs, measured the same way as everything else here.

Browse within: LLM 148agents 117skills 114agent 88agentic-ai 85api 80azure 68antigravity 66ai-coding 63claude-code-plugin 61cursor 54cli 53cybersecurity 53javascript 52

fastapi

505

Jignesh-Ponamwar/skills-mcp

Skill Claude CodeCodex

Build production-grade REST APIs with FastAPI and Python. Covers request/response models with Pydantic v2, path/query/body parameters, dependency injection, authentication (JWT, OAuth2), background tasks, async database access with SQLAlchemy 2.0, middleware, error handling, OpenAPI documentation, and testing with…

not rated 10 5mo ago A 102 tokens original Apache-2.0

api-design

506

duyet/oma

Skill Claude CodeCodex

Design HTTP/REST APIs that are consistent, predictable, and safe to evolve. Trigger when the user asks to "design an API", "add an endpoint", "design a REST route", "what should this return", or is shaping request/response contracts, status codes, pagination, versioning, or errors. Covers resource modeling, status…

not rated 10 +1 14d ago A 87 tokens original Apache-2.0

create-ai-provider

507

markconroy/markie

Skill Claude CodeCodex

Scaffolds a new AI Provider plugin for the Drupal AI module. Asks which operation types the provider supports (chat, embeddings, text-to-image, etc.), then generates the plugin class with the correct interface implementations, authentication setup, and model discovery.

not rated 10 16d ago A 55 tokens GPL-2.0

polygres-advisor

508

Evokoa/polygres-skills

Skill Codex

Find current Polygres guidance for setup, application integration, retrieval design, and troubleshooting by navigating the hosted skills library. Use when a task needs published Polygres guidance through web access.

not rated 10 1mo ago A 44 tokens original Apache-2.0

llmlb-cli-usage

509

akiojin/llmlb

Skill Claude Code

Practical guide for llmlb assistant CLI commands replacing the legacy MCP server flow.

not rated 10 3d ago A 24 tokens original MIT

fastapi

510

kok-o/contextos-agents

Skill Claude CodeCodex

Implement and review FastAPI endpoints, validation, dependencies, lifecycle and Python I/O behavior.

not rated 10 changed yesterday A 21 tokens original Apache-2.0

claude-api

511

m0b1u3/NotitleCode

Skill Claude CodeCodex

Use this skill when the user wants to build with the Claude API or Anthropic SDKs.

not rated 9 +1 7mo ago A 0 tokens

harpist

512

kenobi-ai/harpist

Skill Codex

Use when a user asks an agent to inspect, refine, or generate an API/oRPC/OpenAPI contract from website recordings captured by the Harpist Chrome extension. Covers using the published harpist npm CLI through bunx/npx, avoiding sandboxed execution, starting or reusing the local Harpist bridge, syncing extension…

not rated 9 2mo ago A 102 tokens original MIT

genpark-sdk-copilot

514

alphaparkinc/genpark-sdk-copilot

Skill Claude CodeCodex

An autonomous SDK integration guardrail. Prevents AI hallucinations by forcing the agent to ingest official llms.txt documentation and clone verified boilerplates before writing any custom code.

not rated 9 6mo ago A 43 tokens

tbc-bank-api

515

erekle1/georgian-payments-skills

Skill Claude CodeCodex

Use when integrating TBC Bank payment/banking APIs or preparing the merchant documentation TBC requires. Triggers: TBC Bank, tbcbank.ge, TBC API, Checkout/TPay, recurring/saved-card payments, XML billing protocol (CHECK/PAY) for service providers, TBC installments, exchange rates, Open Banking PSD2 (AIS/PIS) + DBI…

not rated 9 4mo ago A 138 tokens original MIT

SYZ-Coder/codebase-knowledge-wiki

Skill Codex

A Chinese-language version of a workflow for documenting backend systems, services, message flows, and current code-based requirements. It emphasizes recording only facts supported by code and clearly marking uncertain evidence.

not rated 9 4mo ago A 97 tokens original MIT

xfstudio/skills

Skill Claude CodeCodex

Implement secure API design patterns including authentication, authorization, input validation, rate limiting, and protection against common API vulnerabilities.

not rated 9 8mo ago A 29 tokens

api-implementation

518

sei-newbear/xp-harness

Skill Claude Code

A project-specific rulebook for writing the code under an api/ directory, including HTTP endpoints, application logic, and database access.

not rated 9 1mo ago A 91 tokens original MIT

lovable-to-cloudflare

519

pythonlearner1025/lovable-to-cloudflare

Skill Claude CodeCodex

Migrate an app off Lovable to Cloudflare. Defaults to Blitz (blitz.dev), which provisions a Cloudflare Workers backend with SQLite + R2 storage + auth from a single HTTPS call (no signup, no CLI, no SDK install). Two execution paths, fully automated when the host agent has computer use (the Codex app, cua-driver…

not rated 9 5mo ago A 153 tokens original MIT

how2useliteflow

520

bryan31/How2useLiteFlow

Skill Claude CodeCodex

A reference guide for LiteFlow, a Java framework for building business rules and process flows. It covers components, rules, data passed between steps, configuration sources, testing, monitoring, and AI-agent orchestration.

not rated 9 changed 1mo ago A 144 tokens original Apache-2.0

mitmproxy-mcp

521

moha-abdi/mitmproxy-mcp

Skill Claude CodeCodex

Analyze, intercept, and replay HTTP/HTTPS traffic through mitmproxy. Gives you 20 MCP tools for traffic analysis, request replay, interception control, and proxy configuration. Use when debugging APIs, testing security, or understanding how an application talks to its backend.

not rated 9 8mo ago A 59 tokens original MIT

jerrycan-backend

522

backant-io/jerrycan

Skill Claude CodeCodex

Use when building, designing, or scaffolding a backend REST/CRUD API. Guides the whole process step by step — eliciting exactly what the user intends, analyzing an existing frontend to derive the API contract, scoping against what jerrycan can build, authoring design.json, scaffolding, implementing handlers/jobs from…

not rated 9 1mo ago A 92 tokens copy · 100% MIT

instantdb

523

instantdb/skills

Skill Claude CodeCodex

Build complete, functional apps with InstantDB as the backend. Use when creating React/vanilla JS or expo applications. Triggers on requests for building apps.

not rated 9 4mo ago A Socket: passSnyk: warn 35 tokens

control-plane-worker

524

hack-dance/hack

Skill Claude CodeCodex

Implement or verify Hack's local CLI, runtime, env, lifecycle, sessions, and optional agent integrations. The skill name is retained for Factory compatibility.

not rated 9 changed 1mo ago A SkillSpector: pass 34 tokens original MIT

magequery

525

cresset-tools/magequery

Skill Claude CodeCodex

Inspect and verify how a Magento 2 codebase is wired using the fast magequery CLI, before grepping, before reading XML by hand, and before booting bin/magento or magerun. Two modes, both first-choice. Investigate: what a class resolves to (preferences, plugins, virtual types, constructor arguments), why a…

not rated 9 changed 7d ago C 336 tokens EUPL-1.2

wangyendt/wayne-skills

Skill Claude CodeCodex

Feishu/Lark message listener for real-time event processing via WebSocket. Use when users need to listen for incoming Feishu messages (text, image, file, audio, media, sticker, post, interactive) and events (recall, read, reaction, bot added/removed, member changes, chat updates) with automatic deduplication, async…

not rated 9 7d ago A SkillSpector: warn 198 tokens original MIT

erpnext-frappe-dev

527

6missedcalls/erpnext-skill

Skill Claude CodeCodex

Complete Frappe Framework development reference for building ERPNext apps. Use when creating custom DocTypes, controllers, hooks, REST APIs, form scripts, background jobs, or any Frappe/ERPNext development. Contains full API documentation for Document, Database, Controllers, Hooks, REST API, Form Scripts, Testing, and…

not rated 9 8mo ago A 74 tokens original MIT

agentmail

528

pinkpixel-dev/skills-collection-1

Skill Claude CodeCodex

Email infrastructure for AI agents. Create accounts, send/receive emails, manage webhooks, and check karma balance via the AgentMail API.

not rated 9 2mo ago A 31 tokens original Apache-2.0

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: