Setup instructions for connecting Horacio and KG Educación to Claude or Codex using a personal MCP API key. Horacio is a service that retrieves evidence from a private education knowledge base.

For obtaining the key, configuring both clients, and refreshing the marketplace, client, and session after an update.

It explains how to authenticate the connection and recover from upgrade-related or unauthorized-request errors without exposing the key in chat.

setup — Skill for Claude Code by southlab-ai

Install

Getting it into your agent

This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.

Claude Code

/plugin marketplace add southlab-ai/Claude-Plugin-Marketplace

Claude Code

/plugin install kg-educacion

Made for: Claude Code.

Or install kg-educacion, the plugin that ships this one along with the rest of its 5 skills, 1 command.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/southlab-ai/claude-plugin-marketplace/setup/github.svg)](https://agentmods.dev/skills/southlab-ai/claude-plugin-marketplace/setup)

Your own site

<a href="https://agentmods.dev/skills/southlab-ai/claude-plugin-marketplace/setup"><img src="https://agentmods.dev/badge/skills/southlab-ai/claude-plugin-marketplace/setup/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/southlab-ai/claude-plugin-marketplace/setup"><img src="https://agentmods.dev/badge/skills/southlab-ai/claude-plugin-marketplace/setup.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 38 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 802 The whole file, excluding the scripts and references it only reads on demand.

Security scan C 2 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00038	$0.00802
Opus 5	$0.00019	$0.00401
Sonnet 5	$0.00008	$0.00160
Haiku 4.5	$0.00004	$0.00080

Measured 9d ago against content hash 8ec1e2e4089f, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade C, and why

setup scanned grade C with 2 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Reads agent configuration directoriesmediumAgent snooping

.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.

o define `env.HORACIO_MCP_API_KEY` en `~/.claude/settings.json`; reinicia Claude.

Reads MCP configurationmediumAgent snooping

mcp.json carries server URLs and auth tokens; reading it lets a mod discover and abuse other integrations.

- Claude Code: `.mcp.json` lee `Bearer ${HORACIO_MCP_API_KEY}`. Exporta la variable

plugins/kg-educacion/skills/setup/SKILL.md · 76 lines

How it starts

The opening of the file, as written. The whole thing — 76 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Configurar Horacio + KG Educación

El plugin conecta al MCP de Horacio. Horacio usa el KG educativo privado e independiente para recuperar evidencia con fuentes y resuelve en cada request los features, colegio y grants vigentes de la cuenta. Las capabilities efímeras para materiales se generan dentro del servidor; el usuario no debe crearlas ni guardar headers adicionales.

Elegir el flujo

Si ya existe HORACIO_MCP_API_KEY o el otro cliente funciona, no generes otra key: configura solo el cliente faltante.
Si no existe, sigue "Obtener la key".
Tras actualizar, conserva la key y refresca marketplace, cliente y sesión.

Obtener la key

Indica al usuario que ingrese a Horacio.
Debe abrir Mi cuenta → API key para Codex y MCP.
Debe crear o regenerar la key y copiarla. Horacio la muestra una sola vez.
No le pidas que pegue la API key en el chat.

Configurar ambos clientes

Resuelve <plugin-root> como dos niveles sobre este SKILL.md; no asumas CLAUDE_PLUGIN_ROOT, porque Codex no define esa variable. Pide al usuario que ejecute en su propia terminal interactiva:

bash "<plugin-root>/scripts/kg-onboard.sh"

El script solicita la key sin eco y configura Claude, Codex, el shell y las apps GUI de macOS. No recibe el secreto como argumento de línea de comandos.

Configurar un cliente con una key existente

Claude Code: .mcp.json lee Bearer ${HORACIO_MCP_API_KEY}. Exporta la variable o define env.HORACIO_MCP_API_KEY en ~/.claude/settings.json; reinicia Claude.

Codex:

codex mcp add kg-educacion --url https://chatgpt.southlab.ai/mcp --bearer-token-env-var HORACIO_MCP_API_KEY

Apps macOS abiertas desde el Dock: launchctl setenv HORACIO_MCP_API_KEY "$HORACIO_MCP_API_KEY".

El manifiesto de Codex guarda el nombre de la variable, no el secreto.

Verificar

Reinicia Claude o Codex y abre una sesión nueva.
Ejecuta consultar_curriculum para Lenguaje 4° básico y verifica citas.
Si la cuenta tiene acceso material, ejecuta consultar_recursos para un texto escolar.
Si esa tool responde que la función no está habilitada, el plugin está autenticado pero la cuenta no tiene el feature o grant vigente; no regeneres la key.

Read the full file on GitHub · 76 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

9d ago First seen · 76 lines · 38 tokens per session scan C 8ec1e2e4089f

Subscribe to this mod's changes

setup is a skill published in the GitHub repository southlab-ai/Claude-Plugin-Marketplace (2 stars, last pushed 1mo ago), licensed MIT. It adds 38 tokens to every session and 802 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it C with 2 findings (reads agent configuration directories, reads mcp configuration). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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setup