@prereason/mcp

MCP server for PreReason — the Context API for financial agents.

PreReason returns pre-reasoned market briefings: trend signals, regime classification, confidence scores, cross-asset correlations, and causal narratives. Use it when your agent needs to reason about market conditions, not parse raw price feeds.

Quick Start

Option 1: Direct HTTP (Claude Code, Cursor, Windsurf, etc.)

Clients that support remote MCP servers can connect directly with no bridge package needed.

# Claude Code (CLI one-liner)
claude mcp add prereason --transport http https://api.prereason.com/api/mcp

Or add to .mcp.json / your client's MCP config:

{
  "mcpServers": {
    "prereason": {
      "type": "http",
      "url": "https://api.prereason.com/api/mcp",
      "headers": {
        "Authorization": "Bearer YOUR_API_KEY"
      }
    }
  }
}

Option 2: stdio bridge (Claude Desktop and other stdio-only clients)

Requires

Add to your MCP client config (e.g. claude_desktop_config.json):

{
  "mcpServers": {
    "prereason": {
      "command": "npx",
      "args": ["-y", "@prereason/mcp"],
      "env": {
        "PREREASON_API_KEY": "YOUR_API_KEY"
      }
    }
  }
}

Claude Desktop config file location:

• macOS: ~/Library/Application Support/Claude/claude_desktop_config.json

• Windows: %APPDATA%\Claude\claude_desktop_config.json

Restart your MCP client after editing the config. PreReason should appear with 5 tools.

Get an API Key

1. Sign up at prereason.com/signup

2. Go to Dashboard > Settings > API Keys

3. Copy your key (starts with pr_live_)

5 MCP Tools

17 Market Briefings

Free (6 briefings)

Basic - $19.99/mo (5 briefings)

Pro - $49.99/mo (6 briefings)

Example Prompts

Once connected, try prompts like:

• "What's the current BTC regime?"

• "Show me the macro snapshot"

• "What does the full context briefing say about market conditions?"

• "Get the bitcoin price metric with trend analysis"

• "What's the hash ribbon signal right now?"

• "List available briefings"

Troubleshooting

"Server disconnected" error

• Ensure Node.js 18+ is installed: node --version

• Check your API key starts with pr_live_

• Fully quit Claude Desktop (system tray > Quit) and reopen

Tools not appearing

• Restart Claude Desktop after editing config

• Verify JSON syntax: node -e "JSON.parse(require('fs').readFileSync('path/to/config','utf8'))"

Windows: "'C:\Program' is not recognized"

If you still see this error, ensure you're using the env block (not --header args) as shown in Quick Start above. If the issue persists, install globally and use node:

1. Run: npm install -g @prereason/mcp

2. Use this config (replace YOUR_USER with your Windows username):

{
  "mcpServers": {
    "prereason": {
      "command": "node",
      "args": [
        "C:\\Users\\YOUR_USER\\AppData\\Roaming\\npm\\node_modules\\@prereason\\mcp\\bin\\cli.js"
      ],
      "env": {
        "PREREASON_API_KEY": "YOUR_API_KEY"
      }
    }
  }
}

Auth errors on get_context / get_metric

• list_briefings, list_metrics, and get_health work without a key

• get_context and get_metric require a valid API key

• Get a free key at prereason.com/signup

Other MCP Clients

If your client supports remote HTTP servers, use Quick Start Option 1 above. The stdio bridge package is only needed for clients that require stdio transport (e.g. Claude Desktop).

CLI Usage

# Using environment variable (recommended)
PREREASON_API_KEY=pr_live_... npx @prereason/mcp

# Using --header flag (backward compatible)
npx @prereason/mcp --header "Authorization:Bearer YOUR_API_KEY"

# Custom URL
PREREASON_URL=https://custom.endpoint/mcp npx @prereason/mcp

# Help
npx @prereason/mcp --help

Links

• Documentation

• Sign Up

• API Discovery

• Terms of Service

• Privacy Policy

License

MIT