Backend and APIs skills

oboard/claude-code-rev

Skill Claude CodeCodex

Use this skill when the user is building against Anthropic APIs or SDKs, including @anthropic-ai/sdk, anthropic, or Agent SDK integrations.

vercel-labs/opensrc

Skill Claude Code ✓ vendor

Fetch dependency source code to give AI agents deeper implementation context. Use when the agent needs to understand how a library works internally, read source code for a package, fetch implementation details for a dependency, or explore how an npm/PyPI/crates.io package is built. Triggers include "fetch source for"…

moltis-org/moltis

Skill Claude CodeCodex

Create and manage webhook subscriptions for event-driven agent activation. Use when the user wants external services (GitHub, GitLab, Stripe, Linear, PagerDuty, Sentry, or any generic source) to trigger agent runs by POSTing events to a URL.

teaql/teaql-agent-kit

Skill Codex

Build or change a TeaQL application in Java, Rust, Go, Swift, Python, C#/.NET, or TypeScript, including Kotlin/JVM applications that consume Java-generated libraries. Mandatory order: first draft and save a complete KSML model, then verify the client and evaluate that saved model, repair it through repeated evaluation…

supabase/agent-skills

Skill Claude CodeCodex ✓ vendor

Use when doing ANY task involving Supabase. Triggers: Supabase products (Database, Auth, Edge Functions, Realtime, Storage, Vectors, Cron, Queues); client libraries and SSR integrations (supabase-js, @supabase/ssr) in Next.js, React, SvelteKit, Astro, Remix; auth issues (login, logout, sessions, JWT, cookies…

earendil-works/absurd

Skill Claude CodeCodex

Debug and operate Absurd durable workflows with absurdctl. Use when working with Absurd queues, tasks, runs, events, retries, schema setup, or when a user wants to inspect, spawn, retry, cancel, or wake workflows.

knowsuchagency/mcp2cli

Skill Claude Code

Turn any MCP server, OpenAPI spec, or GraphQL endpoint into a CLI. Use this skill when the user wants to interact with an MCP server, OpenAPI/REST API, or GraphQL API via command line, discover available tools/endpoints, call API operations, or generate a new skill from an API. Triggers include "mcp2cli", "call this…

vercel/workflow

Skill Claude CodeCodex ✓ vendor

Creates durable, resumable workflows using Vercel's Workflow SDK. Use when building workflows that need to survive restarts, pause for external events, retry on failure, or coordinate multi-step operations over time. Triggers on mentions of "workflow", "durable functions", "resumable", "workflow sdk", "queue"…

dstackai/dstack

Skill Claude CodeCodex

Use with the dstack skill for model-serving work when the image, serving command, resources, backend/fleet choice, or service behavior is not proven. Guides task-first prototyping on real hardware, choosing fleets/backends that can reuse idle instances and caches, checking vLLM/SGLang sources, and verifying the final…

4thfever/cultivation-world-simulator

Skill Cursor

A skill for planning or implementing a stable control API for external agents or Claw systems. Its description is in Chinese and focuses on layered design, query and command handling, runtime serialization, and contract documentation.

silvertakana/worldwideview

Skill Claude CodeCodex

Use when creating a new plugin, adding a new data source, or debugging missing plugin data in the WorldWideView project. Triggers on seeder creation, WebSocket streaming issues, plugin registration failures, manifest validation errors, GeoEntity rendering problems, or data engine integration.

mcollina/skills

Skill Claude CodeCodex

Contributes to and debugs Node.js core, including nodejs/node commit and PR tone, contribution workflows, native crashes, V8 performance, node-gyp builds, N-API bindings, and libuv issues. Use when drafting or reviewing a Node.js core commit or pull request, working in nodejs/node, or diagnosing C++ addons…

pengchengneo/Claude-Code

Skill Claude CodeCodex

Restored placeholder content.

Dicklesworthstone/pi_agent_rust

Skill Claude CodeCodex

Master C#/.NET backend development patterns for building robust APIs, MCP servers, and enterprise applications. Covers async/await, dependency injection, Entity Framework Core, Dapper, configuration, caching, and testing with xUnit. Use when developing .NET backends, reviewing C# code, or designing API architectures.

vercel-labs/emulate

Skill Claude Code ✓ vendor

Emulated Slack API for local development and testing. Use when the user needs to interact with Slack API endpoints locally, test Slack integrations, emulate channels/messages/users/views, set up Slack OAuth flows, test incoming webhooks, or work with the Slack Web API without hitting the real Slack API. Triggers…

mateaix/matecloud

Skill Claude Code

A project-specific guide for creating MateCloud business modules with Domain-Driven Design (DDD), a way to organise code around business concepts.

VoidenHQ/voiden

Skill Claude CodeCodex

Create and edit Voiden .void files for API testing. Covers the .void file format and all enabled extension block types.

benavlabs/fastcrud

Skill Claude CodeCodex

Use when building or modifying CRUD endpoints with FastCRUD (the fastcrud PyPI package) in a FastAPI project — covers FastCRUD, crudrouter, EndpointCreator, FilterConfig, JoinConfig, auto-relationship detection, the filter operator syntax (gte, in, ilike, etc.), cursor pagination, soft delete, and how to avoid N+1…

EtienneLescot/n8n-as-code

Skill Claude CodeCodex

Use when the user explicitly wants to create, edit, validate, sync, or troubleshoot n8n workflows, asks about n8n nodes or automation, or wants to use n8n-as-code in the current context root.

universal-tool-calling-protocol/code-mode

Skill Claude CodeCodex

Call external APIs, MCP servers, and CLI tools by writing TypeScript code that runs in a sandbox — without MCP. Use when the user wants the agent to use a tool/API/integration (e.g. "search Open Library", "read my Notion", "call this REST API") in an environment that has a shell but no MCP config and no settable…

haydenbleasel/files-sdk

Skill Claude CodeCodex

Use files-sdk to add file storage to a TypeScript/JavaScript app with a unified API across S3, R2, GCS, Azure, Vercel Blob, the local filesystem, and 40+ other providers. Triggers when the user wants to upload/download/list/move/delete/copy files, generate presigned URLs, do multipart or resumable uploads, range…

beehive-lab/TornadoVM

Skill Claude Code

NVIDIA-specific TornadoVM workflows on the CUDA backend — profile with Nsight Systems (nsys) and read NVTX ranges, use the hybrid library-task API (cuBLAS/cuBLASLt/cuDNN/cuFFT/cuSPARSE/cuTENSOR/CUTLASS/NCCL native calls from Java), print the generated CUDA-C kernel, and fuzz-test the CUDA-C backend with tornado-fuzz.…

nixopus/nixopus

Skill Claude CodeCodex

Reference for all Nixopus API operations callable via nixopusapi(method, path, body).

atsign-foundation/at_client_sdk

Skill Claude Code

Use this skill when a developer is building a Dart or Flutter app that depends on atclient or atclientflutter from pub.dev, stores or shares data via the Atsign Protocol, needs onboarding (CRAM new-atsign, atKeys file, keychain, APKAM) or APKAM enrollment, or asks about AtCollection , CItem , Query , sub-collections…