Multicast

One integration. All your MCP servers. Parallel execution.

Claude.ai ──> Multicast ──┬──> context-hub
                          ├──> supabase
                          └──> github
                          (all in parallel)

The Problem

Claude.ai requires a separate integration for each MCP server. 5 servers = 5 integrations, 5 OAuth setups, and sequential execution. Each tool call takes 2-5 seconds. Four sequential calls = 12-20 seconds of waiting.

The Solution

Add Multicast once. It connects to all your MCP servers and calls them in parallel.

• One integration instead of many
• Parallel execution instead of sequential
• Unified discovery -- Claude sees all your tools through one gateway
• $0/month on Cloudflare Workers free tier

Quick Start

npx create-multicast

The installer will:

1. Scan your machine for existing MCP configurations (Claude Code, Claude Desktop, Cursor, VS Code)
2. Show you which servers are HTTP-compatible (and which are stdio-only)
3. Let you select which servers to register
4. Auto-detect credentials from existing configs
5. Deploy to Cloudflare Workers
6. Give you the URL to add to Claude.ai

How It Works

Multicast exposes 3 tools to Claude:

| Tool | Purpose | |------|---------| | list_servers | Discover available servers and their tools | | multicast | Call multiple servers in parallel, get combined results | | refresh_servers | Force re-discovery of server tools |

Example: Parallel Calls

{
  "calls": [
    { "server": "context-hub", "tool": "search_memories", "args": { "query": "project ideas" } },
    { "server": "supabase", "tool": "execute_sql", "args": { "sql": "SELECT count(*) FROM users" } },
    { "server": "github", "tool": "search_code", "args": { "query": "authentication" } }
  ]
}

All three calls execute simultaneously. Results return together:

{
  "results": [
    { "server": "context-hub", "tool": "search_memories", "success": true, "output": {...}, "duration_ms": 340 },
    { "server": "supabase", "tool": "execute_sql", "success": true, "output": {...}, "duration_ms": 520 },
    { "server": "github", "tool": "search_code", "success": true, "output": {...}, "duration_ms": 450 }
  ],
  "total_ms": 520,
  "completed": 3,
  "failed": 0
}

Without Multicast: 3 calls x ~4s each = ~12 seconds With Multicast: 1 call, all parallel = ~0.5 seconds

Credentials and Security

You deploy your OWN Multicast instance on your Cloudflare account.

• MCP server URLs stored as encrypted env vars (MCP_SERVER_*)
• Auth tokens stored as encrypted env vars (MCP_AUTH_*)
• Credentials never leave your Cloudflare account
• No shared infrastructure, no central server
• Each user has their own isolated instance

Manual Setup

If you prefer not to use the installer:

# 1. Clone and install
git clone https://github.com/mayankbohra/multicast.git
cd multicast
npm install

# 2. Login to Cloudflare
npx wrangler login

# 3. Create D1 database
npx wrangler d1 create multicast-db
# Copy the database_id from output and update wrangler.toml

# 4. Run migration
npx wrangler d1 execute multicast-db --remote --file=./migrations/0001_init.sql

# 5. Register your MCP servers
npx wrangler secret put MCP_SERVER_CONTEXT_HUB
# Enter: https://context-hub.yourname.workers.dev/mcp

npx wrangler secret put MCP_SERVER_SUPABASE
# Enter: https://supabase-mcp.example.com/mcp

npx wrangler secret put MCP_AUTH_SUPABASE
# Enter: Bearer sb-xxxxxxxxxxxx

# 6. Deploy
npx wrangler deploy

# 7. Add to Claude.ai
# Settings -> Integrations -> Add MCP Server
# Enter: https://multicast.yourname.workers.dev/mcp

Adding / Removing Servers

# Add a new server
npx wrangler secret put MCP_SERVER_NEWSERVICE
npx wrangler secret put MCP_AUTH_NEWSERVICE  # if auth needed
npx wrangler deploy

# Remove a server
npx wrangler secret delete MCP_SERVER_OLDSERVICE
npx wrangler secret delete MCP_AUTH_OLDSERVICE
npx wrangler deploy

# Refresh tool discovery after changes
# Ask Claude to call: refresh_servers

stdio vs HTTP

Multicast runs in the cloud (Cloudflare Workers). It can only call MCP servers that have HTTP endpoints.

| Server Type | Compatible? | Example | |------------|-------------|---------| | HTTP MCP servers | Yes | context-hub, supabase-mcp, any remote MCP | | stdio MCP servers | No | filesystem, git, sqlite (these run locally) |

The installer auto-detects which type each server is and only offers HTTP-compatible ones.

Limitations

• Cannot parallelize Claude's built-in web search (internal to Anthropic)
• Cannot parallelize Claude's managed connectors (Slack, Gmail, Notion)
• Only works with your custom HTTP MCP servers
• Cannot call stdio/local MCP servers (they run on your machine, not in the cloud)
• Requires a free Cloudflare account

Tool Discovery

Multicast caches each server's available tools in a D1 database. The cache refreshes automatically every 24 hours, or on-demand via the refresh_servers tool. This means list_servers responds instantly without calling downstream servers every time.

Cost

| Component | Cost | |-----------|------| | Cloudflare Workers | $0 (100K requests/day free) | | Cloudflare D1 | $0 (5M reads/day free) | | Total | $0/month |

Tech Stack

• Runtime: Cloudflare Workers
• Database: Cloudflare D1 (tool discovery cache only)
• Protocol: Model Context Protocol (MCP) over Streamable HTTP
• Language: TypeScript (single file)
• Auth storage: Cloudflare encrypted environment variables

Related

• Claude Context Hub -- shared AI context across Claude interfaces (same $0 Cloudflare stack)

License

MIT