Backend and APIs

19,654 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.

JustineDevs/premortem

Skill Claude CodeCodex

Builds Nango Functions in a checked-out Zero YAML TypeScript Nango project using local files, index.ts registration, nango dryrun, generated tests, and optional nango deploy via CLI. Use when creating, updating, validating, testing, or deploying Nango actions or syncs locally in a repo. This content overlaps with…

not rated 2 3mo ago A 122 tokens original Apache-2.0

diagram-design

1514

stvlynn/dsh.fish

Skill Claude Code

Create branded architecture, IT current-state, flowchart, sequence, state machine, ER/data model, timeline, swimlane, quadrant, radar/spider, polar chart (polar/radial lollipop), loop/flywheel, nested, tree, org chart, layer stack, Venn, pyramid/funnel, treemap, bar, line, Gantt and scatter charts, high-level…

not rated 2 5d ago A 188 tokens copy · 100% MIT

client-library

1515

koizumikento/reinfolib-mcp

Cursor rule Cursor

A design guide for a Python client that connects to Japan’s Real Estate Information Library API, a service providing real-estate data. It covers API-key setup, request settings, and typed data models.

not rated 2 2mo ago A 0 tokens original MIT

api-reviewer

1516

Arclude/Arterm-CLI

Agent Claude Code

Reviews API-facing changes for breaking edits and missing docs.

not rated 2 2mo ago A 14 tokens original MIT

make-cli

1517

makeitfutureDev/make-com-cli

Skill Claude CodeCodex

CLI for the Make.com automation platform. Manage organizations, teams, folders, scenarios, webhooks, connections, data stores, functions, and sync entire orgs to local disk for analysis. Also covers Make.com MCP server setup, zone configuration, blueprint analysis, and searching for properties across synced scenario…

not rated 2 4mo ago A 99 tokens

trycatch

1518

GitRavz/TryCatch

Skill Claude CodeCodex

Use when asked to check, audit, or review a web application's security, authentication, permissions, access control, error handling, API/endpoint surface, or database management — including "is my app secure", "check my auth", "review my permissions", "find vulnerabilities", or a pre-launch/pre-handover review.

not rated 2 3mo ago A 68 tokens original MIT

using-firebase

1520

SpillwaveSolutions/using-firebase

Skill Claude Code

Comprehensive Firebase development guidance for GCP-hosted applications. Covers Firestore database operations (CRUD, queries, transactions, data modeling), Cloud Functions (1st and 2nd generation, TypeScript and Python, all trigger types), Firebase CLI operations, emulator setup and data persistence, security rules…

not rated 2 10mo ago A 194 tokens

africastalking-sms

1522

oquidave/production-ready-agent-skills

Skill Claude CodeCodex

Send an SMS via the Africa's Talking SMS API. Use whenever the user wants to send a text message, alert, OTP, notification, "send SMS to ", or any phrasing that involves delivering a short message to a mobile phone in Africa. The skill posts to Africa's Talking's REST endpoint and returns the delivery status.

not rated 2 6mo ago A 75 tokens

qiniu-add-maas

1523

qbox/skillhub

Skill Claude CodeCodex

A code-integration guide for adding Qiniu Cloud, a cloud service provider, to a project that already supports other model providers.

not rated 2 6mo ago A 84 tokens

create-express-app

1524

r2rka1/skills

Skill Claude Code

Scaffolds a new Express.js REST API application with TypeScript, structured routing, middleware, and error handling. Guides through project creation, configuration, and initial setup. Use when the user wants to create, start, or scaffold a new Express server, API, or backend project.

not rated 2 2mo ago A 62 tokens

django-crud-views

1525

jacob-consulting/skills

Plugin Claude Code

Bundles 1 skill · 176 tokens together

Build Django CRUD interfaces with the django-crud-views package — ViewSets, tables, filters, forms, workflows, per-object permissions, and non-ORM resources.

not rated 2 changed 18d ago A tokens not measured original MIT

api

1526

outboundsync/skills

Skill Claude CodeCodex

Guide agents through the OutboundSync API v1 and hosted MCP: auth, scopes, Sources vs destinations vs Sync Monitoring Webhooks vocabulary, discovery, pipeline metrics, and which specialized skill to run. Use when the user asks how to use the OutboundSync API, what their API key can access, which endpoint or MCP tool…

not rated 2 changed 1mo ago A 135 tokens original MIT

litd-grpc

1527

HannahMR/lightning-skills

Skill Claude CodeCodex

Reference for litd (Lightning Terminal) gRPC API in Go: managing accounts, baking macaroons, listing payments, and creating LNC sessions.

not rated 2 5mo ago A 36 tokens

modelbase-fsm

1528

grasscaograss/AwesomeWeldoneSkills

Skill Claude CodeCodex

A reference guide to the ModelBase finite-state machine, a program structure that moves through named states when events occur. It documents the states, transitions, workflow data, services, and execution flow for the system.

not rated 2 3mo ago A 87 tokens original Apache-2.0

review-external-api

1529

alifpay/skills

Skill Claude CodeCodex

Review backend code that integrates with external/third-party APIs (payment providers, banks, KYC, card networks, crypto exchanges, SMS/OTP, any outbound HTTP/gRPC to a system you do not own). Checks planning of failure modes, idempotency, timeout and retry strategy, response code classification, duplicate-transaction…

not rated 2 6mo ago A 243 tokens

snippe-integration

1530

Neurotech-HQ/skills

Skill Claude CodeCodex

Build integrations with Snippe (api.snippe.sh), a Tanzania payment processing API. Use this skill whenever the user mentions Snippe, is working on payment integrations for Tanzania (mobile money via M-Pesa, Airtel Money, Mixx by Yas, Halotel; credit/debit cards via Visa/Mastercard; dynamic QR codes), needs to accept…

not rated 2 7mo ago A 158 tokens original MIT

inkbox-python

1531

VectorlyApp/skills

Skill Claude Code

Use when writing Python code that imports from inkbox, uses pip install inkbox, or when adding email, phone, or agent identity features using the Inkbox Python SDK.

not rated 2 7mo ago A 41 tokens

nestjs-best-practices

1532

Ahmustufa/nestjs-best-practices-skill

Skill Claude CodeCodex

NestJS expert best practices for writing, reviewing, or refactoring NestJS code. Triggers on tasks involving NestJS modules, controllers, services, DTOs, guards, interceptors, TypeORM entities, authentication, configuration, or performance patterns.

not rated 2 7mo ago A 56 tokens

claude-api

1533

turf0909/sleep-code

Skill Claude CodeCodex

You are an expert at building applications with the Anthropic Claude API. Help the user write correct, idiomatic code using the latest API patterns and SDK conventions.

not rated 2 6mo ago A 0 tokens

claude-api

1534

huangzida/skills

Skill Claude CodeCodex

Build, debug, and optimize Claude API / Anthropic SDK apps. Apps built with this skill should include prompt caching. Also handles migrating existing Claude API code between Claude model versions (4.5 → 4.6, 4.6 → 4.7, retired-model replacements). TRIGGER when: code imports anthropic/@anthropic-ai/sdk; user asks for…

not rated 2 5mo ago A 193 tokens

goperigon/skills

Skill Claude CodeCodex

Best practices for building with the Perigon News Intelligence API. Use this skill when searching or filtering news articles, tracking evolving stories, generating AI-powered summaries, performing semantic vector search over news or Wikipedia, querying people, companies, journalists, or sources databases, or…

not rated 2 7mo ago A 70 tokens original Apache-2.0

mcp-builder

1536

sskarz/nanoclawbster

Skill Claude Code

Build, register, and use custom MCP servers within this environment. Use this when asked to create a new tool, capability, or integration as an MCP server.

not rated 2 3mo ago A 36 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: