Backend and APIs

28,553 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.

comet-ml/opik

Instructions file GitHub Copilot

Instructions for comet-ml/opik, covering opik python sdk code review guidelines, 🔧 core architecture principles, three-layer architecture, execution paths and 📋 api design standards.

not rated 22k today A 8,537 tokens original Apache-2.0

screenpipe-api

74

screenpipe/screenpipe

Skill Claude CodeCodex

Query the user's local and synced-device Screenpipe data via the REST API at localhost:3030. Use for screen activity, meetings, apps, productivity, other-device or cross-device history, media export, retranscription, or connected services.

not rated 21k +17 changed today A 52 tokens

jsdocs

75

pingdotgg/t3code

Skill Claude CodeCodex

Write, insert, or update Effect public API JSDoc so it satisfies the jsdocs oxlint rule. Use when adding or fixing JSDoc comments, resolving jsdocs diagnostics, preparing docs for JSON extraction, or reviewing public API documentation.

not rated 22k today A 52 tokens original MIT

qa-test

76

steipete/CodexBar

Skill Claude CodeCodex

CodexBar live QA/e2e testing: run provider usage matrix checks, validate real app config, use Peekaboo for menu proof, use Browser Use/official docs for API spec or logged-in dashboard checks, and handle 1Password credentials safely.

not rated 21k today B 55 tokens original MIT

sdk

77

kortix-ai/suna

Skill Claude CodeCodex

The hard rules for editing @kortix/sdk (packages/sdk) — a PUBLISHED npm package with constraints no other package in this repo has: TDD is mandatory (failing test first, gates run and pasted every turn, explicit shippable YES/NO/NOT YET); exported names INCLUDING types are a public API contract and renaming one is a…

not rated 20k today A 149 tokens

kortix-system

78

kortix-ai/suna

Skill Claude CodeCodex

Canonical reference for Kortix projects, Apps, the CLI, sessions, sandboxes, change requests, triggers, connectors, secrets, system skills, and OpenCode REST. Covers kortix.yaml versions 1 and 2, serverless App deployments, OpenCode configuration, session identity, credential boundaries, and the complete OpenCode…

not rated 20k changed yesterday A 145 tokens

eliza-cloud

79

elizaOS/eliza

Skill Claude CodeCodex

Use when the task involves Eliza Cloud or elizaOS Cloud as a managed backend, app platform, deployment target, billing layer, or monetization surface. The catch-all skill for any user request about THEIR existing apps / containers / earnings / credits / api-keys / analytics / billing / payment requests / payouts …

not rated 19k today A 191 tokens original MIT

a0-create-plugin

80

agent0ai/agent-zero

Skill Claude CodeCodex

Create, extend, or modify Agent Zero plugins. Follows strict full-stack conventions (usr/plugins, plugin.yaml, Store Gating, AgentContext, plugin settings). Use for UI hooks, API handlers, lifecycle extensions, or plugin settings UI.

not rated 19k 2d ago A 54 tokens

notebooklm

81

teng-lin/notebooklm-py

Skill Claude CodeCodex

Install, authenticate, troubleshoot, and operate Gemini Notebook through the notebooklm-py CLI or typed async Python API. Use for notebook and source management, grounded chat and research, and artifact generation or download when the user mentions Gemini Notebook, notebooklm-py, the notebooklm CLI, or its Python API.…

not rated 19k changed today A 79 tokens original MIT

isdown

82

danielmiessler/LifeOS

Command

Check whether a site is down for everyone or just you — local probe + downforeveryoneorjustme API, with --deep for a 7-node worldwide sweep via check-host.net.

not rated 19k 20d ago A 42 tokens original MIT

iii-core-primitives

83

iii-hq/iii

Skill Claude CodeCodex

Use when registering iii functions, binding triggers, selecting sync/void/enqueue invocation, creating workers, inspecting the live worker registry, installing registry workers, authoring custom triggers, moving channel data, or adapting external HTTP functions across TypeScript, Python, and Rust.

not rated 19k 4d ago A 58 tokens

mcp

84

keploy/keploy

MCP server Claude CodeCodexCursor +2

End-to-end API testing — generate and run tests from OpenAPI, curl, Postman, or real user traffic. Remote server at api.keploy.io.

not rated 18k today A tokens not measured original Apache-2.0

host-pattern

85

nukeop/nuclear

Skill Claude CodeCodex

Use when adding a new domain to Nuclear's plugin system, or implementing a host. Covers the host pattern (how player functionality is exposed to plugins), the host interface and API class structure, how hosts are implemented in the player, error handling conventions, and what files to create and modify. Trigger…

not rated 18k today A 86 tokens AGPL-3.0

twitter-hand-skill

86

RightNow-AI/openfang

Skill Claude CodeCodex

Expert knowledge for AI Twitter/X management — API v2 reference, content strategy, engagement playbook, safety, and performance tracking.

not rated 18k 2mo ago A 30 tokens original Apache-2.0

zhanymkanov/fastapi-best-practices

Instructions file CodexOpenCode

AGENTS.md instructions for zhanymkanov/fastapi-best-practices, covering fastapi best practices for ai agents, compatibility matrix, project structure, async routes and decision rule.

not rated 18k 8d ago A 4,106 tokens

openapi-sync

88

windmill-labs/windmill

Agent Claude Code

Use this agent when backend API endpoints are added, modified, or removed, or when the Flow structure changes and the OpenAPI specification files need to be updated. This includes changes to route handlers in windmill-api, modifications to request/response schemas, changes to authentication requirements, or updates to…

not rated 18k today A 0 tokens

PostToolUse

89

windmill-labs/windmill

Hook Claude Code

One of 4 in settings.json

Runs after a tool call finishes for Edit and Write tool calls, executing format-frontend.sh and format-backend.sh (2 commands). From windmill-labs/windmill.

not rated 18k today A tokens not measured

windmill-overview

90

windmill-labs/windmill

Cursor rule

Windmill is an open-source developer platform for building internal tools, API integrations, background jobs, workflows, and user interfaces. It offers a unified system where scripts are automatically turned into sharable UIs and can be composed into flows or embedded in custom applications.

not rated 18k today A 0 tokens

github

91

langbot-app/LangBot

MCP server Claude CodeCodexCursor +2

One of 5 in .mcp.json

Lets the agent work with GitHub: search code, read and create issues and pull requests, and manage repositories through the GitHub API. Runs locally from the @modelcontextprotocol/server-github npm package. Needs 1 environment variable to run.

not rated 18k yesterday A tokens not measured original Apache-2.0

error-handling

94

microsoft/data-formulator

Skill Claude CodeCodexCursor ✓ vendor

A shared way to report and handle errors between a frontend and backend application.

not rated 17k 6d ago A 34 tokens original MIT

path-safety

95

microsoft/data-formulator

Skill Claude CodeCodexCursor ✓ vendor

A set of rules for safely handling server-side file paths and file access.

not rated 17k 6d ago A 50 tokens original MIT

slate-plan

96

udecode/plate

Cursor rule Codex

Review Slate v2 architecture/API plans against React 19.2 runtime performance, Slate-close unopinionated DX, legacy-regression proof, research evidence, and shadcn-style composability; write a scored plan and keep completion pending until every required pass and closure gate is complete.

not rated 17k +8 3d ago A 58 tokens

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: