vurb.ts MCP — Cas d'usage, Installer & Démo en direct

Pourquoi l'utiliser

Fonctionnalités clés

Presenter-based schema — undeclared fields are physically stripped before the LLM sees them
Built-in .redactPII() at the Late Guillotine stage (post-logic, pre-LLM)
FSM State Gates — tools can't execute out of a declared order
File-based routing: drop a tool in src/tools/, it's live
CLI scaffolds (vurb create) and deploy targets (Vinkius Edge, Vercel, Cloudflare Workers)

Démo en direct

Aperçu en pratique

vurb-ts.replay ▶ prêt

0/0

Installer

Choisissez votre client

~/Library/Application Support/Claude/claude_desktop_config.json · Windows: %APPDATA%\Claude\claude_desktop_config.json

{
  "mcpServers": {
    "vurb-ts": {
      "command": "npx",
      "args": [
        "-y",
        "vurb.ts"
      ],
      "_inferred": true
    }
  }
}

Ouvrez Claude Desktop → Settings → Developer → Edit Config. Redémarrez après avoir enregistré.

~/.cursor/mcp.json · .cursor/mcp.json

{
  "mcpServers": {
    "vurb-ts": {
      "command": "npx",
      "args": [
        "-y",
        "vurb.ts"
      ],
      "_inferred": true
    }
  }
}

Cursor utilise le même schéma mcpServers que Claude Desktop. La config projet l'emporte sur la globale.

VS Code → Cline → MCP Servers → Edit

{
  "mcpServers": {
    "vurb-ts": {
      "command": "npx",
      "args": [
        "-y",
        "vurb.ts"
      ],
      "_inferred": true
    }
  }
}

Cliquez sur l'icône MCP Servers dans la barre latérale Cline, puis "Edit Configuration".

~/.codeium/windsurf/mcp_config.json

{
  "mcpServers": {
    "vurb-ts": {
      "command": "npx",
      "args": [
        "-y",
        "vurb.ts"
      ],
      "_inferred": true
    }
  }
}

Même format que Claude Desktop. Redémarrez Windsurf pour appliquer.

~/.continue/config.json

{
  "mcpServers": [
    {
      "name": "vurb-ts",
      "command": "npx",
      "args": [
        "-y",
        "vurb.ts"
      ]
    }
  ]
}

Continue utilise un tableau d'objets serveur plutôt qu'une map.

~/.config/zed/settings.json

{
  "context_servers": {
    "vurb-ts": {
      "command": {
        "path": "npx",
        "args": [
          "-y",
          "vurb.ts"
        ]
      }
    }
  }
}

Ajoutez dans context_servers. Zed recharge à chaud à la sauvegarde.

claude mcp add vurb-ts -- npx -y vurb.ts

Une seule ligne. Vérifiez avec claude mcp list. Supprimez avec claude mcp remove.

Cas d'usage

Usages concrets : vurb.ts

How to build a PII-safe MCP server with Vurb.ts

👤 Developers building an MCP for a product with customer data ⏱ ~60 min advanced

Quand l'utiliser : You're wrapping an internal system and must guarantee PII never leaves the perimeter.

Prérequis

Node 20+ and npm — Standard
Vurb CLI — npm install -g @vurb/cli

Déroulement

Scaffold

Run vurb create customer-mcp with the prisma vector, and open the generated src/tools/ folder.✓ Copié

→ Scaffolded project
Declare a presenter

Add a presenter for the Customer model that exposes only id, plan, and country. Everything else (email, phone, address) is physically stripped.✓ Copié

→ LLM sees only declared fields
Add PII redaction on free-text fields

On the Note model's body field, apply .redactPII() at the Late Guillotine.✓ Copié

→ Emails/phones inside note bodies masked
Test with the in-memory pipeline

Write a @vurb/testing case that feeds a record with fake PII and asserts the output is redacted.✓ Copié

→ Test passes

Résultat : An MCP server where PII leakage is a compile/runtime impossibility, not a code review item.

Pièges

Redaction regex never catches everything — Combine presenter whitelist + redaction — don't rely on redaction alone
Presenter drift over time — CI assertion: snapshot presenter output for key models; fail PRs that change it without review

Enforce correct tool-call order with FSM state gates

👤 MCP authors building multi-step flows (booking, checkout) ⏱ ~30 min intermediate

Quand l'utiliser : You have tools that must run in a specific order; you want the framework to enforce it.

Déroulement

Define state machine

Create an FSM for checkout: cart → quote → payment → confirm. Each tool gated by the state.✓ Copié

→ State definition file
Attach gates to tools

Tool confirm_order only allowed from state=payment.✓ Copié

→ Calling out-of-order returns a gate error

Résultat : Agents physically cannot skip prerequisite steps.

Deploy a Vurb MCP to Cloudflare Workers or Vinkius Edge

👤 Builders wanting global low-latency MCPs ⏱ ~20 min intermediate

Quand l'utiliser : You want the MCP close to users, not in a single region.

Déroulement

Choose target

vurb deploy --target cloudflare✓ Copié

→ Worker published
Smoke test

List tools via the deployed URL.✓ Copié

→ Tool list returns from CF

Résultat : A globally distributed MCP server.

Combinaisons

Associez-le à d'autres MCPs pour un effet X10

vurb-ts + jetski

Build with Vurb; operate behind Jetski for OAuth + analytics

Generate a Vurb MCP and deploy behind Jetski so users authenticate via OAuth and we get prompt analytics.✓ Copié

vurb-ts + proxy-2

Aggregate your Vurb MCP alongside third-party MCPs via mcp-proxy

Register the deployed Vurb MCP as an upstream of mcp-proxy so teammates see it alongside github/sentry.✓ Copié

Outils

Ce que ce MCP expose

Outil	Entrées	Quand appeler	Coût
(framework)	You write tools; framework exposes them	N/A — Vurb.ts is for authoring MCP servers, not a runtime MCP to call	n/a

Coût et limites

Coût d'exécution

Quota d'API: Framework itself has no runtime cost; hosting costs depend on deploy target
Tokens par appel: Varies by the tools you build
Monétaire: Free, open source
Astuce: Edge deploys are cheap (CF Workers free tier handles modest traffic).

Sécurité

Permissions, secrets, portée

Stockage des identifiants : Whatever your deployed tools need; framework provides middleware hooks for injection

Sortie de données : Depends entirely on the tools you write

PII protections are opt-in — if you skip presenter declarations, raw DB rows go to the LLM.
SKILL.md files are shipped to agents; review before publishing.

Dépannage

Erreurs courantes et correctifs

Tool file added but not showing up

File-based router watches src/tools/; restart dev server or check the export pattern.

Vérifier : vurb dev logs

Presenter strips too much

Ensure presenter fields match the schema; add missing fields back explicitly.

Vérifier : Unit test presenter output

State gate error on a valid call

Check FSM transitions — source state might not match. Print current state in middleware.

Vérifier : Add a log in state middleware

Alternatives

vurb.ts vs autres

Alternative	Quand l'utiliser	Compromis
FastMCP (TypeScript)	You want the minimum boilerplate, no opinionated guards	No PII/FSM features — you bolt them on
@modelcontextprotocol/sdk	You want raw protocol control	Bring your own auth, redaction, tests
volcano-agent-sdk	You're building agents that consume MCPs, not servers	Different role in the stack

Plus

Ressources

📖 Lire le README officiel sur GitHub

🐙 Voir les issues ouvertes

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