buildmymcpserver/BuildMyMCPServer_MASTER_PROMPT.md

# 🎯 BUILD: BuildMyMCPServer — Production-Ready SaaS

> **Master Prompt für Claude Code**
> Mission: Baue eine komplette, deploy-ready SaaS-Plattform die aus einem natürlichsprachigen Prompt einen vollständig gehosteten, OAuth-2.1-geschützten MCP-Server (Model Context Protocol) erzeugt, deployed und verwaltet. Endkunden konfigurieren ihn in Claude Desktop, Cursor oder ChatGPT mit einem Klick.

---

## 1. PROJECT IDENTITY & POSITIONING

**Produktname:** BuildMyMCPServer
**Domain:** buildmymcpserver.com (bzw. die spätere gewählte Variante)
**Tagline:** *"Describe your tool. We host the server. AI uses it."*
**Untertitel:** *"From prompt to production MCP server in 60 seconds. OAuth 2.1, Streamable HTTP, ready for Claude, Cursor & ChatGPT."*

**Zielgruppe primär:** B2B Mid-Market — Operations Leads, Solo-Founder, Tech-Teams in KMUs, Agenturen die für Kunden MCP-Server bauen, interne Tooling-Teams in Enterprise.

**Pricing-Anker (im UI sichtbar):**
- **Hobby:** €0 — 1 Server, 100k Tool-Calls/Mo, geteilte Infra, BMM-Subdomain
- **Pro:** €49/Mo — 5 Server, 1M Calls, Custom Domain, Priority Build
- **Team:** €149/Mo — 25 Server, 10M Calls, RBAC, Audit-Logs, SLA 99.9%
- **Enterprise:** ab €499/Mo — Unlimited, BYOC, SSO/SAML, dedicated Cluster

**Brand-Voice:** Technisch, präzise, ohne Marketing-BS. "It's infrastructure, not magic." Dunkel & monochrom mit einem präzisen Akzent. Kein lila Gradient, kein "AI sparkle". Inspiration: Linear, Vercel, Resend, Railway. **Native-feel, kein generisches AI-Wrapper-UI.**

---

## 2. TECH-STACK (fest, nicht verhandelbar)

### Monorepo (Turborepo + pnpm)

```
buildmymcpserver/
├── apps/
│   ├── web/              # Next.js 15 (App Router) — Marketing + Dashboard
│   ├── api/              # Fastify Backend (Control Plane)
│   ├── generator/        # Generation-Worker (BullMQ-Consumer)
│   └── runner-template/  # Template für gehostete MCP-Server-Container
├── packages/
│   ├── db/               # Drizzle ORM + PostgreSQL Schema
│   ├── mcp-templates/    # Code-Templates für generierte Server
│   ├── ui/               # Shared shadcn/ui components
│   ├── auth/             # Better-Auth wrapper
│   └── types/            # Shared TypeScript types (Zod)
├── infra/
│   ├── docker/           # Dockerfiles
│   ├── coolify/          # Coolify-Konfigurationen
│   └── traefik/          # Reverse-Proxy-Config
└── turbo.json
```

### Stack-Entscheidungen (final)

**Frontend Web:**
- Next.js 15 (App Router, RSC, Server Actions)
- TypeScript (strict mode)
- Tailwind CSS v4
- shadcn/ui (registry-mode, nur was wir brauchen)
- Lucide-React (icons)
- Framer Motion (sparingly — nur für state-transitions)
- next-themes (dark default, light optional)

**Backend:**
- Fastify (statt Express — schneller, besseres TS)
- Drizzle ORM
- PostgreSQL 16
- Redis 7 (BullMQ-Queue + Sessions)
- Better-Auth (Auth-Layer — User-Auth NICHT MCP-OAuth)
- Stripe (Subscriptions + Metered-Billing)

**MCP-Generierung:**
- Anthropic Claude API (claude-opus-4-7 für Generation, claude-haiku-4-5 für Fixes)
- `@modelcontextprotocol/sdk` v1.x (TypeScript) als Basis-Library für generierte Server
- Zod für Tool-Input-Validation
- esbuild für Build-Pipeline

**Hosting / Runtime:**
- Coolify (auf Hetzner Dedicated AX52) — Container-Orchestrator
- Docker (jeder Kunden-MCP-Server = eigener Container)
- Traefik (Reverse-Proxy + automatic SSL via Let's Encrypt + per-customer subdomains)
- Cloudflare (DNS + DDoS + Cache vor Web)

**Transport für generierte MCP-Server:**
- **Streamable HTTP** (Stand 2025-11-25 spec) — der einzige Standard heute
- KEIN SSE (deprecated seit 2025-06-18)
- Stateless-ready (Sessions in Redis falls nötig, default stateless)
- OAuth 2.1 + PKCE + Dynamic Client Registration + Resource Indicators (RFC 8707)
- `.well-known/oauth-protected-resource` Discovery Endpoint
- `.well-known/oauth-authorization-server` (OAuth Authorization Server Metadata, RFC 8414)

**Observability:**
- OpenTelemetry (OTel Collector → Grafana/Loki/Tempo Self-hosted)
- BetterStack für Uptime-Pings
- Sentry für Frontend + Backend Errors

**CI/CD:**
- GitHub Actions
- Docker-Build → Push zu GHCR
- Coolify Webhook für Auto-Deploy

---

## 3. SYSTEM-ARCHITEKTUR (so funktioniert das Ganze)

```
┌─────────────────────────────────────────────────────────────┐
│                         END USER                            │
│  (uses Claude Desktop / Cursor / ChatGPT to call MCP tools) │
└──────────────────────────┬──────────────────────────────────┘
                           │ Streamable HTTP + OAuth 2.1
                           ▼
┌─────────────────────────────────────────────────────────────┐
│              TRAEFIK (per-customer routing)                 │
│         {slug}.mcp.buildmymcpserver.com → container         │
└──────────────────────────┬──────────────────────────────────┘
                           │
                           ▼
┌─────────────────────────────────────────────────────────────┐
│          KUNDEN-MCP-SERVER (Docker Container, 1 pro Server) │
│  - Generierter Code aus Template + Claude-Output           │
│  - @modelcontextprotocol/sdk                                │
│  - OAuth 2.1 Resource Server                                │
│  - Connects to: Customer's APIs, DBs, etc.                  │
└──────────────────────────┬──────────────────────────────────┘
                           │ (logs, metrics)
                           ▼
┌─────────────────────────────────────────────────────────────┐
│                  CONTROL PLANE (Fastify API)                │
│  - User-Auth (Better-Auth)                                  │
│  - Server-CRUD                                              │
│  - Generation-Job-Queue (BullMQ)                            │
│  - Container-Orchestrierung (Coolify API)                   │
│  - Billing (Stripe webhooks)                                │
│  - Tool-Call-Metering (für Usage-based-Billing)             │
└──────────────────────────┬──────────────────────────────────┘
                           │
              ┌────────────┼────────────┐
              ▼            ▼            ▼
         ┌────────┐  ┌──────────┐  ┌──────────┐
         │Postgres│  │  Redis   │  │ Coolify  │
         └────────┘  └──────────┘  └──────────┘

┌─────────────────────────────────────────────────────────────┐
│           CUSTOMER (Marco's User) — uses Web Dashboard      │
│  Next.js 15 Dashboard:                                      │
│  - Prompt to build a new MCP server                         │
│  - Watch generation stream in real-time                     │
│  - Manage existing servers (logs, restart, edit)            │
│  - Install instructions for Claude/Cursor/ChatGPT           │
└─────────────────────────────────────────────────────────────┘
```

**Kritischer Flow — "Prompt to Live Server":**

1. User loggt sich ins Dashboard ein, klickt "New MCP Server"
2. Gibt Prompt ein: *"Create an MCP server that queries my Postgres DB at db.example.com with read-only access to the users and orders tables"*
3. UI fragt strukturiert nach: API endpoints, secrets needed, scopes, tool names
4. Backend pusht Job in BullMQ Queue
5. Generator-Worker:
   - Lädt MCP-Template
   - Ruft Claude API mit System-Prompt + User-Spezifikation
   - Parst generierte Tools/Resources/Prompts (Zod-validated)
   - Schreibt fertigen TypeScript-Code
   - Baut Docker-Image via `docker buildx`
   - Pusht zu interner Registry
   - Triggert Coolify-Deployment auf `{slug}.mcp.buildmymcpserver.com`
   - Streamt Status (queued → generating → building → deploying → live) via Server-Sent-Events ans Dashboard
6. User sieht Live-URL + Copy-Paste-Snippets für:
   - **Claude Desktop:** `claude_desktop_config.json` Eintrag
   - **Cursor:** `mcp.json` Eintrag
   - **ChatGPT Custom Connector:** URL + OAuth-Setup
7. Erster Tool-Call vom End-User → Traefik → Container → Tool → Response → Metric in Redis → später aggregiert in Postgres für Billing

---

## 4. DATABASE SCHEMA (Drizzle, vollständig)

```typescript
// packages/db/schema.ts

import { pgTable, uuid, varchar, text, timestamp, jsonb, boolean, integer, bigint, index, pgEnum } from 'drizzle-orm/pg-core';

export const planEnum = pgEnum('plan', ['hobby', 'pro', 'team', 'enterprise']);
export const serverStatusEnum = pgEnum('server_status', ['draft', 'queued', 'generating', 'building', 'deploying', 'live', 'failed', 'paused']);
export const buildStatusEnum = pgEnum('build_status', ['queued', 'running', 'success', 'failed', 'cancelled']);

// Tenant/Org-Modell — auch wenn Single-User, baust du es Org-fähig (kein Refactor später)
export const organizations = pgTable('organizations', {
  id: uuid('id').defaultRandom().primaryKey(),
  slug: varchar('slug', { length: 64 }).notNull().unique(),
  name: varchar('name', { length: 128 }).notNull(),
  plan: planEnum('plan').default('hobby').notNull(),
  stripeCustomerId: varchar('stripe_customer_id', { length: 128 }),
  stripeSubscriptionId: varchar('stripe_subscription_id', { length: 128 }),
  monthlyCallQuota: bigint('monthly_call_quota', { mode: 'number' }).default(100_000),
  callsThisPeriod: bigint('calls_this_period', { mode: 'number' }).default(0),
  periodStartsAt: timestamp('period_starts_at').defaultNow(),
  createdAt: timestamp('created_at').defaultNow().notNull(),
});

export const users = pgTable('users', {
  id: uuid('id').defaultRandom().primaryKey(),
  email: varchar('email', { length: 255 }).notNull().unique(),
  name: varchar('name', { length: 128 }),
  avatarUrl: text('avatar_url'),
  createdAt: timestamp('created_at').defaultNow().notNull(),
});

export const memberships = pgTable('memberships', {
  id: uuid('id').defaultRandom().primaryKey(),
  orgId: uuid('org_id').references(() => organizations.id, { onDelete: 'cascade' }).notNull(),
  userId: uuid('user_id').references(() => users.id, { onDelete: 'cascade' }).notNull(),
  role: varchar('role', { length: 32 }).default('owner').notNull(), // owner | admin | member | viewer
  createdAt: timestamp('created_at').defaultNow().notNull(),
});

export const mcpServers = pgTable('mcp_servers', {
  id: uuid('id').defaultRandom().primaryKey(),
  orgId: uuid('org_id').references(() => organizations.id, { onDelete: 'cascade' }).notNull(),
  slug: varchar('slug', { length: 64 }).notNull(), // becomes subdomain
  name: varchar('name', { length: 128 }).notNull(),
  description: text('description'),
  status: serverStatusEnum('status').default('draft').notNull(),
  currentVersion: integer('current_version').default(0),
  containerId: varchar('container_id', { length: 128 }), // Coolify ref
  publicUrl: text('public_url'), // https://{slug}.mcp.buildmymcpserver.com
  toolsSchema: jsonb('tools_schema'), // generated tools metadata
  oauthEnabled: boolean('oauth_enabled').default(true),
  createdAt: timestamp('created_at').defaultNow().notNull(),
  updatedAt: timestamp('updated_at').defaultNow().notNull(),
}, (table) => ({
  orgSlugIdx: index('idx_servers_org_slug').on(table.orgId, table.slug),
}));

export const builds = pgTable('builds', {
  id: uuid('id').defaultRandom().primaryKey(),
  serverId: uuid('server_id').references(() => mcpServers.id, { onDelete: 'cascade' }).notNull(),
  version: integer('version').notNull(),
  prompt: text('prompt').notNull(),
  generatedCode: text('generated_code'),
  status: buildStatusEnum('status').default('queued').notNull(),
  errorMessage: text('error_message'),
  startedAt: timestamp('started_at'),
  finishedAt: timestamp('finished_at'),
  createdAt: timestamp('created_at').defaultNow().notNull(),
});

export const secrets = pgTable('secrets', {
  id: uuid('id').defaultRandom().primaryKey(),
  serverId: uuid('server_id').references(() => mcpServers.id, { onDelete: 'cascade' }).notNull(),
  key: varchar('key', { length: 128 }).notNull(),
  encryptedValue: text('encrypted_value').notNull(), // AES-256-GCM, key in env
  createdAt: timestamp('created_at').defaultNow().notNull(),
});

// Per-customer OAuth clients (für Dynamic Client Registration)
export const oauthClients = pgTable('oauth_clients', {
  id: uuid('id').defaultRandom().primaryKey(),
  serverId: uuid('server_id').references(() => mcpServers.id, { onDelete: 'cascade' }).notNull(),
  clientId: varchar('client_id', { length: 128 }).notNull().unique(),
  clientSecretHash: text('client_secret_hash'), // bcrypt
  redirectUris: jsonb('redirect_uris').notNull(), // string[]
  metadata: jsonb('metadata'), // RFC 7591 client metadata
  createdAt: timestamp('created_at').defaultNow().notNull(),
});

export const oauthTokens = pgTable('oauth_tokens', {
  id: uuid('id').defaultRandom().primaryKey(),
  clientId: uuid('client_id').references(() => oauthClients.id, { onDelete: 'cascade' }).notNull(),
  accessTokenHash: text('access_token_hash').notNull(),
  refreshTokenHash: text('refresh_token_hash'),
  scope: text('scope'),
  expiresAt: timestamp('expires_at').notNull(),
  createdAt: timestamp('created_at').defaultNow().notNull(),
});

export const toolCallMetrics = pgTable('tool_call_metrics', {
  id: uuid('id').defaultRandom().primaryKey(),
  serverId: uuid('server_id').references(() => mcpServers.id).notNull(),
  toolName: varchar('tool_name', { length: 128 }).notNull(),
  durationMs: integer('duration_ms'),
  success: boolean('success').notNull(),
  errorCode: varchar('error_code', { length: 64 }),
  timestamp: timestamp('timestamp').defaultNow().notNull(),
}, (table) => ({
  serverTimeIdx: index('idx_metrics_server_time').on(table.serverId, table.timestamp),
}));

export const auditLog = pgTable('audit_log', {
  id: uuid('id').defaultRandom().primaryKey(),
  orgId: uuid('org_id').references(() => organizations.id),
  userId: uuid('user_id').references(() => users.id),
  action: varchar('action', { length: 128 }).notNull(),
  resourceType: varchar('resource_type', { length: 64 }),
  resourceId: varchar('resource_id', { length: 128 }),
  metadata: jsonb('metadata'),
  ipAddress: varchar('ip_address', { length: 64 }),
  createdAt: timestamp('created_at').defaultNow().notNull(),
});
```

---

## 5. UI/UX — DAS MUSS NATIVE-FEEL HABEN

### Design-Prinzipien

1. **Monochrom mit Akzent.** Background `#0A0A0B` (fast schwarz aber nicht). Foreground `#FAFAFA`. Border `#1F1F22`. Akzentfarbe: ein präzises **Electric Indigo `#6366F1`** sparingly für CTAs und Status-Live. Kein Lila-Gradient.
2. **Geometric Sans + Mono.** `Geist` für UI, `Geist Mono` für Code/IDs/URLs.
3. **Tight Density.** Padding 12-16px nicht 24-32px. Compact-feeling wie Linear/Vercel-Dashboard.
4. **Reduced motion.** Nur Skeleton-Loads und State-Changes animieren (200ms ease-out). Keine "hero-spinners".
5. **Code als Hero.** Jede Page hat irgendwo einen Code-Block (Copy-Button immer rechts oben).
6. **Status-Pills.** `live` = green dot pulsing, `building` = amber spinner, `failed` = red, `draft` = grey.

### Pages (komplett)

**Marketing (apps/web/app):**

1. **`/` (Landing):**
   - Hero: Großes Heading *"Describe your tool. We host the server."*, Subline, ein Code-Block der einen Prompt zeigt + Output-Snippet (animiertes Typing-Demo, nicht Video, in HTML).
   - "How it works" — 3 Steps mit jeweils einem kleinen Screenshot/Code-Block.
   - "Works with" — Logos: Claude, Cursor, ChatGPT, VS Code Copilot, Continue.dev.
   - "Examples" — Grid mit 6 Use-Cases (Postgres, Salesforce, Notion, GitHub, Stripe, Custom REST).
   - Pricing (4 Tiers, transparent, kein "Contact us" außer Enterprise).
   - FAQ (12 Fragen: Was ist MCP, Brauche ich OAuth, Welche AI-Tools, Kann ich self-hosten, Was passiert wenn ich kündige, Custom Domain, etc.).
   - Footer: Status, Docs, GitHub (wenn open-source-Teile), Security/SOC2-roadmap, Privacy, Terms.

2. **`/docs/*`** — MDX-basiert, schmaler 280px Sidebar, max-w-prose, Search via Pagefind. Bereiche: Quickstart, Concepts (Tools, Resources, Prompts, OAuth), Recipes, API-Reference, Self-Hosting-Guide.

3. **`/changelog`** — MDX timeline.

4. **`/pricing`** — wenn aus Landing rausgezogen werden soll.

**Dashboard (apps/web/app/(dashboard)):**

5. **`/dashboard`** — Übersicht. Cards: Servers (Anzahl + Status), Calls this period (Progress-Bar vs Quota), Recent Builds, Quick-Action "New Server".

6. **`/servers`** — Liste aller MCP-Server. Tabelle mit Name, Status, Calls (24h), Last Build, Actions. Filter + Search.

7. **`/servers/new`** — DER WIZARD. Drei-Step:
   - Step 1: Prompt-Eingabe (Textarea mit Beispiel-Prompts als Chips drumherum: *"Postgres reader"*, *"Notion search"*, *"Custom REST API"*).
   - Step 2: Strukturierte Confirmation. Claude hat parsed, zeigt: Tool-Liste, Required Secrets (Input-Felder, encrypted save), Optional Scopes.
   - Step 3: Deploy. Live-Stream der Build-Logs (Server-Sent Events von der API). Bei Success: Live-URL + 3 Tabs (Claude Desktop, Cursor, ChatGPT) mit copy-ready Config-Snippets.

8. **`/servers/[id]`** — Server-Detail mit Tabs:
   - **Overview:** Status, URL, OAuth-Status, Quick-Install-Configs
   - **Tools:** Liste der exposed Tools mit Schemas
   - **Logs:** Streaming-Logs (Server-Sent Events, last 1000 lines)
   - **Metrics:** Charts (Calls/h, Latency P50/P95/P99, Error-Rate) — Recharts
   - **Secrets:** Manage env-vars (verschlüsselt)
   - **Iterate:** Neuer Prompt um Server zu erweitern (= neuer Build, neue Version)
   - **Settings:** Rename, Custom Domain (Pro+), Pause, Delete

9. **`/settings`** — Org/User-Settings, Billing (Stripe Customer Portal embed), API Keys (für CLI), Team Members (Team+).

10. **`/audit`** — Audit Log (Team+).

### Komponenten-Library

Use shadcn/ui registry, install only: `button`, `card`, `dialog`, `dropdown-menu`, `input`, `label`, `select`, `separator`, `sheet`, `table`, `tabs`, `toast`, `tooltip`, `badge`, `skeleton`, `progress`, `command` (für CMD+K). Custom: `<CodeBlock>` mit Shiki highlighting + Copy-Button, `<StatusPill>` mit Animations, `<StreamingLogs>`.

---

## 6. MCP-GENERIERUNGS-PIPELINE (das Kernstück)

### Template (apps/runner-template/src/server.ts)

Ein parametrisiertes Template das die Generation füllt:

```typescript
// THIS IS A TEMPLATE — values in {{ }} get replaced by generator
import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
import { StreamableHTTPServerTransport } from "@modelcontextprotocol/sdk/server/streamableHttp.js";
import { z } from "zod";
import Fastify from "fastify";
import { createRemoteJWKSet, jwtVerify } from "jose";

const server = new McpServer({
  name: "{{SERVER_NAME}}",
  version: "{{SERVER_VERSION}}",
});

// {{TOOL_REGISTRATIONS}}
// Generated tools go here, e.g.:
// server.tool("query_users", "...", { id: z.string() }, async ({ id }) => { ... });

// {{RESOURCE_REGISTRATIONS}}
// {{PROMPT_REGISTRATIONS}}

const app = Fastify({ logger: { level: 'info' } });

// OAuth 2.1 Protected Resource Metadata (RFC 9728)
app.get('/.well-known/oauth-protected-resource', async () => ({
  resource: process.env.PUBLIC_URL,
  authorization_servers: [`${process.env.PUBLIC_URL}/oauth`],
  bearer_methods_supported: ['header'],
  resource_documentation: `${process.env.PUBLIC_URL}/docs`,
  scopes_supported: {{SCOPES_JSON}},
}));

// OAuth Authorization Server Metadata (RFC 8414)
app.get('/.well-known/oauth-authorization-server', async () => ({
  issuer: `${process.env.PUBLIC_URL}/oauth`,
  authorization_endpoint: `${process.env.PUBLIC_URL}/oauth/authorize`,
  token_endpoint: `${process.env.PUBLIC_URL}/oauth/token`,
  registration_endpoint: `${process.env.PUBLIC_URL}/oauth/register`,
  response_types_supported: ['code'],
  grant_types_supported: ['authorization_code', 'refresh_token'],
  code_challenge_methods_supported: ['S256'],
  token_endpoint_auth_methods_supported: ['client_secret_basic', 'client_secret_post', 'none'],
}));

// OAuth endpoints (delegated to control-plane via internal RPC, or local for stateless)
// {{OAUTH_HANDLERS}}

// MCP Streamable HTTP endpoint
const transport = new StreamableHTTPServerTransport({
  sessionIdGenerator: undefined, // stateless mode
});

app.all('/mcp', async (request, reply) => {
  // Validate bearer token (OAuth 2.1 Resource Server)
  const auth = request.headers.authorization;
  if (!auth?.startsWith('Bearer ')) {
    return reply
      .code(401)
      .header('WWW-Authenticate', `Bearer resource_metadata="${process.env.PUBLIC_URL}/.well-known/oauth-protected-resource"`)
      .send({ error: 'unauthorized' });
  }
  
  const token = auth.slice(7);
  try {
    const JWKS = createRemoteJWKSet(new URL(`${process.env.CONTROL_PLANE_URL}/oauth/jwks`));
    const { payload } = await jwtVerify(token, JWKS, {
      issuer: `${process.env.PUBLIC_URL}/oauth`,
      audience: process.env.PUBLIC_URL,
    });
    // RFC 8707 Resource Indicators check
    if (payload.aud !== process.env.PUBLIC_URL) {
      return reply.code(403).send({ error: 'invalid_audience' });
    }
  } catch (e) {
    return reply.code(401).send({ error: 'invalid_token' });
  }
  
  // Forward to MCP transport
  await transport.handleRequest(request.raw, reply.raw, request.body);
});

await server.connect(transport);
await app.listen({ port: parseInt(process.env.PORT || '3000'), host: '0.0.0.0' });
```

### Generator-Worker Logic

```typescript
// apps/generator/src/worker.ts (Pseudocode-Skelett)

import { Worker } from 'bullmq';
import Anthropic from '@anthropic-ai/sdk';

const SYSTEM_PROMPT = `You are an expert TypeScript engineer generating production MCP servers.

Output ONLY a JSON object with this exact schema:
{
  "tools": [
    {
      "name": "snake_case_name",
      "description": "Clear description for the AI client",
      "inputSchema": { /* JSON Schema, strict types */ },
      "implementation": "async ({ args }) => { /* full TypeScript body */ }"
    }
  ],
  "resources": [...],
  "prompts": [...],
  "requiredSecrets": ["API_KEY", "DATABASE_URL"],
  "scopes": ["read:users", "write:orders"],
  "dependencies": { "pg": "^8.13.0" }
}

Rules:
- Use Zod for parameter schemas, NOT JSON Schema directly
- All implementations MUST be async, MUST handle errors, MUST return MCP content blocks
- NEVER use eval, exec, fs writes outside /tmp
- NEVER hardcode secrets — use process.env.{SECRET_NAME}
- Validate all inputs with Zod before use
- Return errors as { content: [{ type: "text", text: "Error: ..." }], isError: true }
- For databases: use parameterized queries ONLY
- For external APIs: implement retry with exponential backoff
- Each tool must be idempotent OR clearly state it is destructive in description
`;

new Worker('build', async (job) => {
  const { serverId, prompt, orgId } = job.data;
  
  // 1. Generate with Claude
  const anthropic = new Anthropic();
  const response = await anthropic.messages.create({
    model: 'claude-opus-4-7',
    max_tokens: 8192,
    system: SYSTEM_PROMPT,
    messages: [{ role: 'user', content: prompt }],
  });
  
  // 2. Parse + Validate output (Zod schema for the generator output itself)
  const spec = parseAndValidate(response.content[0].text);
  
  // 3. Inject into template
  const code = renderTemplate(spec);
  
  // 4. Run static checks (tsc --noEmit on generated code, lint, basic sandbox-test)
  await runStaticChecks(code);
  
  // 5. Build Docker image
  const imageTag = `mcp-${serverId}:v${version}`;
  await dockerBuild(code, imageTag, spec.dependencies);
  
  // 6. Deploy via Coolify API
  await coolify.deploy({
    image: imageTag,
    subdomain: `${serverSlug}.mcp.buildmymcpserver.com`,
    env: secrets,
    healthcheck: '/health',
  });
  
  // 7. Update DB, emit SSE to dashboard
  await db.update(mcpServers).set({ status: 'live', publicUrl: '...' }).where(...);
  await redis.publish(`build:${serverId}`, JSON.stringify({ status: 'live' }));
}, { connection: redis });
```

### Sandboxing & Sicherheit (NON-NEGOTIABLE)

- Container laufen mit `--read-only` Filesystem (außer `/tmp` mit Quota)
- `--cap-drop=ALL`, `--security-opt=no-new-privileges`
- CPU-Limit 0.5 cores, Memory 512MB pro Container default
- Network-Egress nur zu whitelisted Domains (definiert via Tool-Spec)
- Keine SSH, kein Shell in den Containern
- Secrets via Docker Secrets / Coolify Env-Vars (verschlüsselt at rest mit AES-256-GCM in Postgres, KMS-Key in Hetzner Vault oder Doppler)
- Rate-Limit pro Tool-Call (default 100/min/IP, configurable)
- Prompt-Injection-Defense: Generierte Tool-Descriptions werden auf gefährliche Patterns gescannt (z.B. "ignore previous instructions" → reject build)

---

## 7. PFLICHT-FEATURES FÜR PRODUCTION

### MUST-HAVE (MVP-Cut)

- [ ] Auth (Email-Magic-Link + GitHub-OAuth via Better-Auth)
- [ ] Org-Management mit RBAC
- [ ] Server-CRUD
- [ ] Prompt-to-Server Wizard mit Live-Build-Stream
- [ ] Secret-Management (encrypted)
- [ ] OAuth-2.1-Server-Implementation für jeden generierten MCP
- [ ] Streamable HTTP Transport in jedem Generated Server
- [ ] Stripe-Billing (Pro/Team-Subs + Metered Overage)
- [ ] Tool-Call-Metering + Quota-Enforcement
- [ ] Server Detail mit Logs/Metrics
- [ ] Install-Snippets für Claude Desktop, Cursor, ChatGPT
- [ ] Marketing-Landing
- [ ] Docs-Site (10+ Pages)
- [ ] Status-Page
- [ ] Audit-Log
- [ ] Health-Checks + Auto-Restart bei Failure
- [ ] Backups (DB + Server-Configs daily zu Backblaze B2)

### SHOULD-HAVE (Phase 2, nach erstem zahlenden Kunden)

- [ ] CLI (`buildmymcp init`, `deploy`, `logs`)
- [ ] GitHub-Repo-Sync (Server-Code in Customer's Repo pushen für Transparenz/Audit)
- [ ] Template-Marketplace (Pre-Built MCP-Server für gängige Tools)
- [ ] Custom-Domain per Server (CNAME-Validation)
- [ ] Team-Member-Invites
- [ ] Webhooks für Build-Events
- [ ] SSO/SAML für Enterprise

### NICE-TO-HAVE (Phase 3)

- [ ] BYOC (Bring Your Own Cloud — Deploy in Customer's AWS/GCP/Azure)
- [ ] MCP-Registry-Publishing (Servers public listen)
- [ ] AI-Powered Test-Generation (Tests für jeden generierten Tool)
- [ ] Multi-Region Deployment

---

## 8. DEPLOYMENT (production-ready ab Tag 1)

### Hetzner-Setup

- **1× AX52 Dedicated** (€59/Mo): 16 Cores / 64GB RAM — running Coolify + Postgres + Redis + Generator + Customer-Containers (capacity: ~300-500 small MCP-Server)
- **1× CX22 Cloud** (€5/Mo) als Backup-Target + Status-Page
- **Cloudflare Free Plan** für DNS + DDoS
- **Backblaze B2** für DB-Backups (~€1/Mo bis 10GB)

### Domains-Plan

- `buildmymcpserver.com` — Marketing + Dashboard
- `api.buildmymcpserver.com` — Control-Plane API
- `*.mcp.buildmymcpserver.com` — Customer MCP-Server (Wildcard SSL via Let's Encrypt DNS challenge mit Cloudflare API)
- `docs.buildmymcpserver.com` (oder /docs auf Hauptdomain)
- `status.buildmymcpserver.com` (BetterStack hosted)

### Environment-Variables (.env.example)

```
# Control Plane
DATABASE_URL=postgresql://...
REDIS_URL=redis://...
BETTER_AUTH_SECRET=
BETTER_AUTH_URL=https://buildmymcpserver.com
GITHUB_OAUTH_ID=
GITHUB_OAUTH_SECRET=
STRIPE_SECRET_KEY=
STRIPE_WEBHOOK_SECRET=
STRIPE_PRICE_PRO=
STRIPE_PRICE_TEAM=
ANTHROPIC_API_KEY=
SECRETS_ENCRYPTION_KEY=  # 32 bytes hex, AES-256-GCM
COOLIFY_API_URL=https://coolify.internal/...
COOLIFY_API_TOKEN=
TRAEFIK_API_URL=
CLOUDFLARE_API_TOKEN=
SENTRY_DSN=
OTEL_EXPORTER_OTLP_ENDPOINT=

# Per-MCP-Container (injected by generator/coolify)
PUBLIC_URL=https://{slug}.mcp.buildmymcpserver.com
CONTROL_PLANE_URL=https://api.buildmymcpserver.com
SERVER_ID=
PORT=3000
```

### CI/CD (GitHub Actions)

- `pnpm typecheck` (alle Pakete, strict)
- `pnpm test` (Vitest)
- `pnpm lint` (eslint + biome)
- `pnpm build` (turbo)
- Docker-Build mit cache
- Push zu GHCR
- Coolify-Webhook trigger
- Smoke-Test gegen Staging
- Promote zu Prod

---

## 9. WAS DU IN DIESER REIHENFOLGE BAUST

**Sprint 1 (Woche 1): Foundation**
1. Monorepo-Setup (turbo, pnpm, tsconfig, biome, prettier)
2. DB-Schema + Drizzle-Migrations
3. Better-Auth-Setup mit Magic-Link + GitHub
4. Web-App-Shell (Layout, Theme, Auth-Pages, leeres Dashboard)
5. Marketing-Landing (Hero, Pricing, FAQ — kann statisch)

**Sprint 2 (Woche 2): Generation-Pipeline**
6. MCP-Template (apps/runner-template) — fertig lauffähig stdio + Streamable HTTP
7. Generator-Worker mit BullMQ + Claude-API-Call
8. Static-Checks-Pipeline (tsc, lint, security-scan)
9. Docker-Build-Pipeline (lokal mit buildx)
10. Coolify-API-Integration zum Deploy

**Sprint 3 (Woche 3): OAuth + Dashboard**
11. OAuth-2.1-Implementation (Control-Plane als Authorization Server, Per-Server-Container als Resource Server)
12. JWKS Endpoint + Token-Signing (asymmetric, RS256)
13. Dashboard: New-Server-Wizard mit Live-SSE-Stream
14. Server-Detail-Page mit Logs/Metrics
15. Install-Snippets-Generator (Claude/Cursor/ChatGPT-Configs)

**Sprint 4 (Woche 4): Billing + Production**
16. Stripe-Integration (Subscriptions, Webhooks, Metered Usage)
17. Quota-Enforcement
18. Audit-Log
19. Docs-Site (10+ MDX-Pages)
20. Status-Page-Integration
21. Backup-Cron
22. End-to-End Smoke-Test
23. Production-Deploy

---

## 10. ACCEPTANCE CRITERIA — WANN BIST DU FERTIG

✅ User kann sich registrieren, einloggen, sieht ein leeres Dashboard.
✅ User klickt "New Server", gibt Prompt ein wie *"Create an MCP server that exposes a 'search_docs' tool which queries my Notion via API"*, gibt Notion-API-Key ein, sieht Build-Stream live.
✅ Nach <90 Sekunden: Live-URL `xyz.mcp.buildmymcpserver.com/mcp` ist erreichbar, return 401 ohne Token, 200 mit gültigem Token.
✅ User kopiert Snippet in `claude_desktop_config.json`, startet Claude Desktop neu, OAuth-Flow geht durch, Tool ist verfügbar in Claude.
✅ User stellt Frage in Claude die `search_docs` triggert, Result kommt zurück, Call wird in Dashboard-Metrics gezählt.
✅ User kann den Server iterieren ("Add a 'create_page' tool"), neue Version wird gebaut, ohne dass die alte runtergeht (rolling deploy).
✅ Stripe-Checkout für Pro-Plan funktioniert, Quota wird angehoben.
✅ Bei Quota-Überschreitung: HTTP 429 + Hinweis im Dashboard.
✅ Logs streamen in Echtzeit ins Dashboard.
✅ Audit-Log zeigt alle Aktionen.
✅ Lighthouse: 95+ auf allen Marketing-Pages, 90+ auf Dashboard.
✅ TypeScript strict, 0 `any`, 0 unused imports, biome-clean.
✅ Sentry erfasst Errors, OTel-Traces gehen durch.
✅ DB-Backup läuft täglich automatisch.
✅ Generated Server bestehen das offizielle MCP-Test-Suite (`mcp-inspector` + Anthropic's Reference-Client).

---

## 11. WAS DU NIEMALS TUN DARFST

❌ KEIN `eval()` oder `Function()` im Generator-Worker für generierten Code — immer durch Static-Build-Pipeline.
❌ KEIN Sharing von Containern zwischen Kunden — 1 Server = 1 Container = 1 Isolation-Boundary.
❌ KEINE Plain-Text-Secrets in DB — immer AES-256-GCM verschlüsselt.
❌ KEINE Verwendung von deprecated SSE-Transport — nur Streamable HTTP.
❌ KEINE Token-Pass-Through (Spec verbietet es ausdrücklich) — du musst Token-Exchange machen wenn der MCP-Server downstream-APIs aufruft.
❌ KEINE Storage von OAuth-Access-Tokens im Klartext — nur Hashes für Verification.
❌ KEIN `*` als CORS — explizit pro Server konfigurieren.
❌ KEIN automatisches Deploy von generated Code ohne Static-Checks — wenn Checks failen, Build = failed, klare Error-Message.
❌ KEIN Branding wie "Powered by Claude" oder ähnliches im Marketing — du bist eine eigenständige Plattform, kein Anthropic-Wrapper.
❌ KEIN "AI-Sparkle-Design" — Linear/Vercel-Style. Boring on the outside, magic on the inside.

---

## 12. REFERENCES (FÜR DICH, CLAUDE CODE, IM ZWEIFELSFALL CHECKEN)

- MCP Spec: https://modelcontextprotocol.io/specification/2025-11-25/
- MCP Authorization: https://modelcontextprotocol.io/specification/2025-11-25/basic/authorization
- TypeScript SDK: https://github.com/modelcontextprotocol/typescript-sdk
- FastMCP (alternative wrapper, optional): https://github.com/punkpeye/fastmcp
- OAuth 2.1: https://datatracker.ietf.org/doc/draft-ietf-oauth-v2-1/
- RFC 8414 (Auth Server Metadata): https://datatracker.ietf.org/doc/html/rfc8414
- RFC 9728 (Protected Resource Metadata): https://datatracker.ietf.org/doc/html/rfc9728
- RFC 8707 (Resource Indicators): https://datatracker.ietf.org/doc/html/rfc8707
- RFC 7591 (Dynamic Client Registration): https://datatracker.ietf.org/doc/html/rfc7591
- Coolify Docs: https://coolify.io/docs
- Drizzle ORM: https://orm.drizzle.team/

---

## 13. START

Lies diese Spec komplett durch. Stelle Rückfragen wenn etwas mehrdeutig ist. Beginne dann mit Sprint 1, Task 1: Monorepo-Setup. Commit nach jedem abgeschlossenen Task mit conventional-commits-Format (`feat:`, `fix:`, `chore:`, `docs:`).

Wenn du an einem Punkt unsicher bist über die MCP-Spec, **fetche die offizielle Doku, rate nicht aus dem Speicher.** Die Spec ändert sich noch häufig.

**Build it like infrastructure, not like a demo. Production-grade from line 1.**

Let's go.