api designer
by Roy Yuen
$5
Professional API design and review skill for REST, GraphQL, and event-driven architectures.
6
0
Claude Skills for APIs & Backend
Skills for REST APIs, GraphQL endpoints, authentication flows, and backend services. Design, document, and ship robust server-side systems faster.
1,401 live apis & backend skills for Claude Code.
New in APIs & Backend
software architect
by Roy Yuen
$5
A structured framework for planning, reviewing, and evolving complex software systems with explicit trade-offs.
6
2
api mock
by Kevin Cline
$12
Instantly generate a runnable Express or Flask mock API server from a description or OpenAPI spec.
2
0
backend pro max
Free
Advanced engineering intelligence for building scalable, reliable, and secure distributed backend systems.
2
485.0(2)
web3 graphql
by Zhuoxin Sun
Free
Query Web3 and on-chain GraphQL endpoints using natural language via the Model Context Protocol.
3
245.0(1)
amap lbs skill
by 崔新超
Free
A full-stack LBS skill for POI search, route planning, travel itinerary automation, and heatmap visualization.
2
3
discord bot
by Roy Yuen
$5
Architect, build, and review production-grade Discord bots with structured guidance on commands, security, and scaling.
2
0
db schema
by Kevin Cline
$12
Turn plain English app descriptions into fully normalized SQL schemas and entity relationship documentation.
2
0
nginx config
by Kevin Cline
$12
Generate production-ready, commented Nginx configurations from plain English descriptions.
2
1
Auth & Multi Tenant SaaS Foundation
$24
Add login and multi-tenant accounts to your SaaS: sessions, OAuth/SSO, roles and permissions, organizations, teams, invites and row-level data isolation.
2
6
igdb api
$9
Professional IGDB v4 API specialist for advanced game data fetching, Apicalypse queries, and image URL construction.
3
2
cf ai translate
by Kevin Cline
$12
Free, direct translation across 100+ languages using Meta M2M-100 on Cloudflare Workers AI.
2
0
twelve factor auditor
by Julian
$15
Audit applications against 12-Factor methodology to identify architectural risks and generate cloud-native fix plans.
3
0
elevenlabs sound fx
by Kevin Cline
$12
Generate custom AI sound effects and Foley directly from text descriptions using ElevenLabs.
2
0
hl7 fhir bridge
Free
Converts HL7 v2 messages (ADT, ORU, ORM, OUL) into FHIR R4 Bundles with a deterministic engine, validates them against US Core, CL Core or CO Core, and explains every issue down to the exact segment and field. Offline by default, with optional official HL7 FHIR Validator check
1
3
api designer pro
by Julian
$12
Expert API architect to design, review, and audit REST, GraphQL, and event-driven API specifications.
3
0
Python Development Engine
by Joker
Free
Python project routing for Web API/crawler/automation/data/CLI. FastAPI/Django/Flask selection, async patterns, deployment strategies.
1
16
Stripe Subscription Engine
$24
Add Stripe subscriptions to your app: Checkout, customer portal, secure webhooks, plans, seats, proration and failed-payment dunning, wired to your database.
2
7
migration safety pro
by Timoranjes
$5
Run ALTER TABLE on a 10-million-row table without locking writes, losing data, or spending 3 hours writing rollback scripts.
2
0
env doctor advanced
by Timoranjes
Free
Find the missing variable, leaked secret or version mismatch behind "works locally, fails in production" by auditing .env files, shell profiles and CI config.
2
9
steam api
$9
Connect your agent to the Steam Web API to fetch player data, game libraries, and achievement statistics.
2
0
n8n Credential API Creator
by Shogun Labs
$15
Create n8n credentials programmatically via REST API, including a workaround for the cryptic allOf validation bug that blocks OAuth2 credential creation.
2
0
API Contract Guardian for AI Coding Agents
by Shandra
$9.99
Protects API endpoints from accidental breaking changes by generating contract maps, validation rules, integration tests, documentation, and safe AI coding prompts.
2
0
sql query reviewer
by Timoranjes
Free
A pull request lands with a new data-access query. It passes all tests because the test database has 50 rows.
2
125.0(1)
Claude backend skills by task
Claude backend skills give Claude Code a fixed playbook for the backend work you keep rebuilding, which suits backend developers and SaaS founders who ship alone or in a small team. Pick by task.
Design an API. api designer (USD 5) designs and reviews REST, GraphQL and event-driven APIs. Tip: agree on the resource names and error format before the first route.
Guard a contract. API Contract Guardian for AI Coding Agents (USD 9.99) builds contract maps, validation rules and integration tests against breaking changes. Tip: run it before an agent edits an endpoint other teams call.
Model the database. db schema (USD 12) turns a plain-English app description into a normalized SQL schema. Tip: try a migration on a copy of the data first, never on a production database.
Add auth and billing. Auth & Multi-Tenant SaaS Foundation and Stripe Subscription Engine (USD 24 each) cover accounts, tenants, subscriptions and webhooks. Tip: auth and payments deserve a second opinion, so pair them with a security skill.
Prepare for deployment. twelve factor auditor (USD 15) checks twelve-factor compliance and nginx config (USD 12) writes commented Nginx configuration from plain English. Tip: test the config in staging before it serves traffic.
Which backend skill to pick
Start with the task in front of you, not the stack. We would try a free all-rounder first, such as backend pro max, then add a focused skill for the contract or the migration. Read the SKILL.md preview and check users, updates and the scan result. Test every change a skill proposes on a branch with your own test suite before it reaches production. For the data layer, see our data and database skills.
Claude API skills vs. the official claude-api skill
These skills help Claude Code build your own APIs. To build with the Claude API itself, look for the claude-api skill that the Claude Code docs list among the bundled skills and check its current behavior there. Read skills vs. MCP servers, our best API skills for Claude Code and our guide to API development skills.
How a backend skill fits into Claude Code
Connect Claude Code to Agensi once and Claude loads the latest approved version of a backend skill when the task fits its description, or when you ask for it by name, with nothing saved to a skills folder. Every session gets the current version, so the whole team works from the same conventions. The MCP setup guide covers the connection. More: Claude skills marketplace.
Frequently asked questions
Connect an MCP-compatible agent to Agensi and ask it to use the skill on your task. Approve any required purchase. The latest approved instructions load on each use; never save skill files to disk.
Some are free, but most are paid. Paid skills show the price upfront, are a one-time purchase, and include future updates from the creator.
Yes. Every listing is checked by an 8-point automated security scan before it can go live, and the result is shown on each skill page alongside the file list.
Get in touch
Questions, partnership ideas, or feedback on the platform? Tell us what's working and what isn't, we love to hear from you!
SR
Samuel Rose
Founder & CEO of Agensi
Email UsBook a Callinfo@agensi.io
We typically respond within a few hours during business hours.