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backend

v0.5.0

Agentes y skills para NestJS, FastAPI y LLMs con LangChain, LangGraph y LangSmith

CodexClaude Code8 Skills

By Jose Alfaro0 GitHub starsUpdated 1 hour ago

Directory evidence

Runtimes
Codex and Claude Code
Parsed components
8 skill or MCP entries
Source updated
Sep 28, 2026
Manifest status
Canonical path parsed

The directory validates manifest shape and source location. It does not execute the plugin or provide a security endorsement. Review the indexing methodology →

Install backend for Codex and Claude Code

Installs for the current user
codex plugin marketplace add joseAlfaro25/customs_agents
codex plugin marketplace upgrade my-agents
codex plugin add backend@my-agents

Paste and run these commands in a terminal with Codex. They add and refresh the my-agents catalog, then install this plugin.

Compatibility: the page URL and API slug “backend” remain stable.

  • Codex: backend@agent-plugin-marketplace → backend@my-agents

The installer fetches third-party code from the source repository shown on this page. This directory validates manifest structure and source location, but does not perform a security audit; review the manifest, components, and source before installing.

Get the source manually
git clone https://github.com/joseAlfaro25/customs_agents

Clone the source repository, then follow its setup instructions to add the plugin to a compatible client. The plugin root is plugins/backend/.

Plugin files

plugins/backend/
├── .codex-plugin/plugin.json
├── .claude-plugin/plugin.json
├── skills/backend-testing/SKILL.md
├── skills/database-patterns/SKILL.md
├── skills/fastapi-endpoint/SKILL.md
├── skills/langchain-chains/SKILL.md
├── skills/langchain-rag/SKILL.md
├── skills/langgraph-agents/SKILL.md
├── skills/langsmith-observability/SKILL.md
└── skills/nestjs-module/SKILL.md

Included Skills8

backend-testingskills/backend-testing/SKILL.md

Testing backend: Jest + @nestjs/testing (unit y e2e con supertest) y pytest + httpx AsyncClient/TestClient con dependency_overrides, fixtures y DB de test; incluye testing de código LLM con fake chat models. Usar al escribir, arreglar o ampliar tests de APIs NestJS/FastAPI o de cadenas y agentes.

database-patternsskills/database-patterns/SKILL.md

Patrones de acceso a datos: TypeORM y Prisma en NestJS, SQLAlchemy 2.x async y Alembic en FastAPI; repositorios, transacciones, migraciones seguras, N+1, índices y paginación. Usar al crear o modificar modelos, consultas, migraciones o al diagnosticar rendimiento de base de datos.

fastapi-endpointskills/fastapi-endpoint/SKILL.md

Convenciones para endpoints FastAPI: estructura routers/schemas/services/deps, Pydantic v2, Depends con Annotated, async correcto, response_model, status codes, HTTPException y handlers, pydantic-settings y lifespan. Usar al crear o modificar endpoints, dependencias o configuración en FastAPI.

langchain-chainsskills/langchain-chains/SKILL.md

Patrones de LangChain 1.x: chat models (init_chat_model), mensajes, prompts, LCEL y runnables, structured output, tools, create_agent con middleware, streaming e integración en endpoints FastAPI y NestJS (LangChain.js). Usar al añadir llamadas a LLMs, cadenas, tools o agentes simples a un backend.

langchain-ragskills/langchain-rag/SKILL.md

Pipelines RAG con LangChain 1.x: loaders, splitters, embeddings, vector stores (pgvector con langchain-postgres y otros), retrievers, RAG de 2 pasos y agéntico, respuestas con citas y evaluación. Usar al construir búsqueda semántica, chat sobre documentos o mejorar la recuperación.

langgraph-agentsskills/langgraph-agents/SKILL.md

Agentes y workflows con LangGraph 1.x: StateGraph, estado tipado y reducers, edges condicionales, Command, Send, checkpointers y Store, human-in-the-loop con interrupt, subgrafos, multi-agente, streaming y despliegue. Usar al crear o modificar agentes con estado o flujos multi-paso.

langsmith-observabilityskills/langsmith-observability/SKILL.md

Tracing y evaluación con LangSmith: env vars, @traceable y wrappers, proyectos, metadata y tags, datasets, evaluate() y evaluadores (heurísticos y LLM-as-judge), experimentos, pytest, prompts versionados y monitoreo en producción. Usar al instrumentar, depurar o evaluar apps LLM.

nestjs-moduleskills/nestjs-module/SKILL.md

Convenciones para módulos NestJS: estructura module/controller/service/dto/entities, DI, DTOs con class-validator y class-transformer, ValidationPipe global, guards, interceptors, filters, @nestjs/config, errores y Swagger. Usar al crear o modificar recursos, endpoints o configuración en NestJS.

Plugin manifests2

plugins/backend/.codex-plugin/plugin.json
{
  "name": "backend",
  "version": "0.5.0",
  "description": "Agentes y skills para NestJS, FastAPI y LLMs con LangChain, LangGraph y LangSmith",
  "author": {
    "name": "Jose Alfaro"
  },
  "keywords": [
    "backend",
    "nestjs",
    "fastapi",
    "python",
    "api",
    "langchain",
    "langgraph",
    "langsmith",
    "llm",
    "ai"
  ],
  "skills": "./skills/",
  "hooks": "./hooks/codex-hooks.json",
  "interface": {
    "displayName": "My Agents · Backend",
    "shortDescription": "NestJS, FastAPI, LangChain, LangGraph y LangSmith",
    "longDescription": "Agentes y skills para NestJS, FastAPI y LLMs con LangChain, LangGraph y LangSmith",
    "category": "Coding"
  }
}
plugins/backend/.claude-plugin/plugin.json
{
  "name": "backend",
  "version": "0.5.0",
  "description": "Agentes y skills para NestJS, FastAPI y LLMs con LangChain, LangGraph y LangSmith",
  "author": {
    "name": "Jose Alfaro"
  },
  "keywords": [
    "backend",
    "nestjs",
    "fastapi",
    "python",
    "api",
    "langchain",
    "langgraph",
    "langsmith",
    "llm",
    "ai"
  ]
}

For maintainers

If you maintain this plugin, link to this source-backed listing from your README so users can review its manifest and indexed components.

[backend on Agent Plugins Marketplace](https://pluginsmp.com/plugins/backend)