Backend and APIs

24,112 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.

FastMCP Development

241

enuno/unifi-mcp-server

Skill Claude CodeCodex

Use when creating or modifying Model Context Protocol (MCP) servers with FastMCP framework - guides through tools, resources, prompts, authentication, Codex Desktop integration, and production deployment with Python and TypeScript examples.

not rated 245 +3 4d ago A 48 tokens original Apache-2.0

salesforce

242

jdrhyne/agent-skills

Skill Claude CodeCodex

Query and manage Salesforce CRM data via the Salesforce CLI (sf). Run SOQL/SOSL queries, inspect object schemas, create/update/delete records, bulk import/export, execute Apex, deploy metadata, and make raw REST API calls.

not rated 241 6d ago A 50 tokens original MIT

api-designer

244

anxiong2025/25-Day-Agents-Course-by-Google

Skill Claude Code

A helper for designing REST APIs, which let software exchange data over standard web requests. It focuses on consistent names and common design practices.

not rated 240 +1 8mo ago A 20 tokens

ActivityPub AGENTS.md

245

TryGhost/ActivityPub

Instructions file CodexOpenCode

AGENTS.md instructions for TryGhost/ActivityPub, covering activitypub — agent guide, commands, migrations, boundaries — what not to touch and critical gotchas.

not rated 237 today A 1,808 tokens original MIT

LoD-Dawn/Fast-Vben-Admin

Instructions file CodexOpenCode

Architecture and development instructions for Fast Vben Admin, a modular web administration application with separate frontend and backend business modules.

not rated 236 +3 1mo ago A 2,503 tokens original MIT

new-provider

247

finch-xu/cc-router

Skill Claude Code

A workflow for adding a new large-language-model provider to the cc-router application using a YAML description and synchronized project changes. A provider is a company or service that supplies AI models through an API.

not rated 236 +5 6d ago A 166 tokens original MIT

holtwood/awesome-cursorrules-zh

Cursor rule Cursor

A set of coding rules for Kotlin applications built with Spring Boot, a Java-based framework for web services. It covers project layout, naming, Kotlin style, and common design patterns.

not rated 232 +2 1mo ago A 0 tokens original MIT

backend-conventions

249

fpindej/netrock

Skill Claude Code

Backend convention reference (.NET 10 / C# 13). Auto-injected into backend-aware agents - not user-invocable.

not rated 231 5d ago A 27 tokens original MIT

nulab/backlog-mcp-server

Skill Claude Code

Implements a new MCP tool for a Backlog API endpoint from its documentation URL (e.g. https://developer.nulab.com/docs/backlog/api/2/get-space/). Use this skill when you need to add or update a tool in this MCP server based on a Backlog API spec.

not rated 231 +1 2d ago A 67 tokens original MIT

razorpay-mcp-tool-gen

251

razorpay/razorpay-mcp-server

Skill Claude CodeCodex

Generate Razorpay MCP server tool implementations from API documentation URLs, curl commands, or request/response examples. Produces Go tool code, unit tests, registration, and README updates. Use when the user provides a Razorpay API doc link, curl example, or request/response payload and wants a new MCP tool created.

not rated 230 8d ago A 72 tokens original MIT

aki77/activestorage-validator

Skill Claude CodeCodex

Validate ActiveStorage attachments (content type, file size, file extension) with the activestorage-validator gem's blob validator. Use when adding validations to hasoneattached / hasmanyattached attributes.

not rated 226 2mo ago A 48 tokens original MIT

netboxlabs/netbox-mcp-server

Instructions file Claude Code

Claude Code instructions for netboxlabs/netbox-mcp-server, covering netbox mcp server, core concept, tech stack, project structure and common commands.

not rated 224 +5 yesterday A 3,311 tokens original Apache-2.0

doc-sync

254

NVIDIA/TensorRT-Model-Connect

Skill Codex ✓ vendor

Use for documentation maintenance scans that keep the canonical website journey, repo-local skills, commands, API reference, architecture and design, extension guides, feature context, ADRs, and traceability status aligned with the current GitHub main branch. Covers the Source/Internal CI boundary and model-owned…

not rated 224 +36 today A 65 tokens original Apache-2.0

apigee-proxy-skill

255

apigee/devrel

Skill Claude CodeCodex

Teaches an LLM agent to scaffold, configure, validate, package, upload, and deploy Apigee X / hybrid API proxies by orchestrating the 18 MCP tools exposed by the apigee-proxy-skill MCP server. The agent never writes XML by hand — tools generate policy XML from 25 Jinja2 templates, validate bundles with defusedxml…

not rated 220 23d ago A 103 tokens original Apache-2.0

redpanda-data/protoc-gen-go-mcp

Instructions file Claude Code

Instructions for redpanda-data/protoc-gen-go-mcp, covering protoc-gen-go-mcp, build & test, architecture, two modes of operation and key apis.

not rated 220 1mo ago A 1,015 tokens original Apache-2.0

agenticmail

257

agenticmail/agenticmail

Plugin Claude Code

Bundles 3 skills · 64 tokens together

Give every Claude Code agent its own real email address and phone number. Self-hosted, runs entirely on the user's machine. Coordinate work across multiple agents using ordinary email threads.

not rated 218 +6 2d ago A tokens not measured original MIT

neon

258

xai-org/plugin-marketplace

Skill Claude CodeCodex ✓ vendor

Overview of the Neon platform for apps and agents, spanning Postgres, Auth, Data API, and the new services: Object Storage, Compute Functions, and AI Gateway. Use whenever "Neon" is mentioned for an overview of how to work with Neon and how to get started. Otherwise, the individual capabilities are the triggers…

not rated 217 +18 yesterday A 138 tokens

temporal-developer

259

temporalio/skill-temporal-developer

Skill Claude CodeCodex

Develop, debug, and manage Temporal applications across Python, TypeScript, Go, Java, .NET, Ruby, and Rust. Use when the user is building workflows, activities, or workers with a Temporal SDK, debugging issues like non-determinism errors, stuck workflows, or activity retries, using Temporal CLI, Temporal Server, or…

not rated 214 +4 changed today A 161 tokens original MIT

nosia AGENTS.md

260

dilolabs/nosia

Instructions file CodexOpenCode

AGENTS.md instructions for dilolabs/nosia, covering 37signals rails configuration, tech stack, architecture, core philosophy and key commands.

not rated 212 2d ago A 7,549 tokens original MIT

jwt

261

kataras/jwt

Plugin Claude Code

Bundles 2 skills · 266 tokens together

Development guide for the jwt JSON Web Token library for Go: signing and verifying tokens, claims and expiry, algorithm choice (HMAC/RSA/RSA-PSS/ECDSA/EdDSA), kid-based key rotation, JWKS fetch/refresh/publish, blocklisting and testing.

not rated 211 15d ago A tokens not measured original MIT

LerianStudio/ring

Skill Claude CodeCodex

Migrating a Lerian Go app off lib-commons observability imports (deprecated shims or removed APIs) to lib-observability via a fixed mapping table, then bumps go.mod and validates the build; ring:backend-go applies the edits. Covers log/zap/runtime/assert, opentelemetry/tracing, HTTP middleware, context helpers, and…

not rated 211 +1 17d ago A 104 tokens original Apache-2.0

JayCRL/MobileVC

Agent Claude Code

Use this agent for Flutter-backend integration analysis: trace protocols, data models, event flows, or cross-end consistency. Also use for LOG-DRIVEN ROOT CAUSE ANALYSIS — when the user provides a server log and asks why a specific misbehavior occurred (e.g. "why did it stop responding"), this agent parses the log…

not rated 210 +1 2mo ago A 429 tokens original 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: