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Xzar

Registre officiel IA et agents

Crash-test your AI agent on real professional decisions, graded against what actually happened.

Code source Site web Documentation

Installation

Ajoutez ceci à la configuration MCP de votre client (Claude Desktop : claude_desktop_config.json ; Cursor : .cursor/mcp.json ; VS Code et les autres utilisent la même forme « mcpServers »).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http xzar 'https://api.xzar.si/mcp'
Configuration JSON (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "xzar": {
            "type": "http",
            "url": "https://api.xzar.si/mcp"
        }
    }
}
PYPI package xzar-mcp
Claude Code 
claude mcp add xzar -e 'XZAR_API_KEY=<your xzar_api_key>' -e 'XZAR_API_URL=<XZAR_API_URL>' -- uvx xzar-mcp==0.1.2
Configuration JSON (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "xzar": {
            "command": "uvx",
            "args": [
                "xzar-mcp==0.1.2"
            ],
            "env": {
                "XZAR_API_KEY": "<your xzar_api_key>",
                "XZAR_API_URL": "<XZAR_API_URL>"
            }
        }
    }
}

Variables d'environnement

  • XZAR_API_KEY obligatoire secret Your Xzar API key (https://xzar.si/signup.html)
  • XZAR_API_URL Override the API base URL (default https://api.xzar.si); for local development only

Documentation

Tirée du README du projet sur GitHub, actualisée chaque semaine. Les liens ouvrent GitHub.

Sommaire
  1. Xzar MCP server
  2. Setup
  3. Hosted connector (no install)
  4. Claude plugin
  5. Tools
  6. Pricing

Xzar MCP server

Crash-test your AI agent on real professional decisions. Xzar gives your agent real cases, cut at the moment of decision, and grades its answer against what the professional actually decided. Most cases were decided after current models were trained, so they can't have been memorized; fresh ones are added monthly.

Live today:

  • Tariff classification: real U.S. classification decisions, graded exactly at 2, 4, 6, 8 and 10 digits, with a consistency check (the same case asked twice). Testing a tariff classifier? See https://xzar.si/scorecard
  • Patent examination: first action, response and appeal.

More fields are on the way; ask for yours at https://xzar.si.

Setup

  1. Get an API key (with $5 of free credit) at https://xzar.si/signup.html
  2. Add the server to your MCP client:
{
  "mcpServers": {
    "xzar": {
      "command": "uvx",
      "args": ["xzar-mcp"],
      "env": { "XZAR_API_KEY": "your-key" }
    }
  }
}

Hosted connector (no install)

In Claude or any MCP client that supports remote servers: add https://api.xzar.si/mcp and sign in with your Xzar API key.

Claude plugin

The plugin/ folder is the Xzar plugin for Claude. It bundles the hosted connector with two skills: crash-test, which runs a task end to end and explains the score, and xzar-request, for custom tests, pilots, quotes and training access. In Claude Code:

/plugin install xzar --marketplace xzar-si/xzar-mcp

Tools

ToolWhat it does
start_taskStart a task: the case, the instructions and the tool budget
search_librarySearch the case's reference library
read_publicationRead one library item
search_rulesSearch the professional rulebook for the task
read_ruleRead one rulebook section
submit_answerSubmit the decision; returns the exact score and the grade receipt
request_serviceAsk for a custom test for your field, a pilot, a quote, or training access; get a reference and next steps
get_scorecardYour agent's scorecard across tasks
get_usageCredit balance and usage

Answer keys never leave Xzar's servers. This package holds no tasks; it calls the Xzar API with your key.

Pricing

Prepaid credits, charged per task. See https://xzar.si/docs.html. Pilots and ongoing testing: https://xzar.si.

Questions fréquentes

Qu'est-ce que Xzar ?

Crash-test your AI agent on real professional decisions, graded against what actually happened.

Comment installer Xzar ?

Il fonctionne comme serveur distant. Dans Claude Code : claude mcp add --transport http xzar 'https://api.xzar.si/mcp'. Pour les autres clients, collez la configuration JSON de cette page dans leurs réglages MCP.

Faut-il une clé API pour Xzar ?

Oui. Il attend XZAR_API_KEY, à renseigner dans sa configuration.

Xzar est-il open source ?

Oui. Son code est sur GitHub sous licence MIT.

Qui maintient Xzar ?

Il est publié par xzar-si. AI.tn le référence sans le maintenir ni le recommander.

Issu du registre MCP officiel. Être listé n'est pas une recommandation : vérifiez le code et les permissions d'un serveur avant de lui donner accès à vos données.