Karbon MCP Server

by mad-man-danio.github.Mad-Man-Dan/karbon-mcp-serverv0.2.4

Unofficial MCP server for Karbon practice management: contacts, work, time, invoices, payments.

0Node.jsstdioofficial registry

context tax

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security

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cold start

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freshness

Maintained3mo ago

Install Karbon MCP server

claude mcp add karbon -e KARBON_BEARER_TOKEN='<karbon-bearer-token>' -e KARBON_ACCESS_KEY='<karbon-access-key>' -- npx -y karbon-mcp-server

{
  "mcpServers": {
    "karbon": {
      "command": "npx",
      "args": [
        "-y",
        "karbon-mcp-server"
      ],
      "env": {
        "KARBON_BEARER_TOKEN": "<karbon-bearer-token>",
        "KARBON_ACCESS_KEY": "<karbon-access-key>"
      }
    }
  }
}

Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (project).

{
  "mcpServers": {
    "karbon": {
      "command": "npx",
      "args": [
        "-y",
        "karbon-mcp-server"
      ],
      "env": {
        "KARBON_BEARER_TOKEN": "<karbon-bearer-token>",
        "KARBON_ACCESS_KEY": "<karbon-access-key>"
      }
    }
  }
}

Settings → Developer → Edit Config (claude_desktop_config.json), then restart.

{
  "servers": {
    "karbon": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "karbon-mcp-server"
      ],
      "env": {
        "KARBON_BEARER_TOKEN": "<karbon-bearer-token>",
        "KARBON_ACCESS_KEY": "<karbon-access-key>"
      }
    }
  }
}

Add to .vscode/mcp.json in your workspace.

{
  "mcpServers": {
    "karbon": {
      "command": "npx",
      "args": [
        "-y",
        "karbon-mcp-server"
      ],
      "env": {
        "KARBON_BEARER_TOKEN": "<karbon-bearer-token>",
        "KARBON_ACCESS_KEY": "<karbon-access-key>"
      }
    }
  }
}

Add to ~/.codeium/windsurf/mcp_config.json.

Configuration

Variable	Required	Secret	Description
KARBON_BEARER_TOKEN	yes	yes	Bearer token (Application Authorization Token) from Karbon → Settings → Connected Apps → API Applications
KARBON_ACCESS_KEY	yes	yes	Access key (JWT starting with 'ey') from Karbon → Settings → Connected Apps → API Applications
KARBON_READ_ONLY	—	—	Set to 'true' to disable all create/update tools (they are not registered at all)
KARBON_ALLOW_PAYMENT_WRITES	—	—	Set to 'true' to enable the payment write tools (create/delete/reverse manual payments); off by default

Freshness

Maintained — last maintenance signal 3mo ago. The newest of the signals below sets the band.

Last commit (default branch)
2026-07-16 · 3mo ago · GitHub
Latest release
2026-07-16 · 3mo ago · GitHub · v0.2.4
Package published
no data · npm/PyPI
Registry entry updated
2026-07-16 · 3mo ago · official registry · v0.2.4

FAQ

›How do I install the Karbon MCP server in Claude Code?

Run: claude mcp add karbon -e KARBON_BEARER_TOKEN='<karbon-bearer-token>' -e KARBON_ACCESS_KEY='<karbon-access-key>' -- npx -y karbon-mcp-server. For Cursor, VS Code, Claude Desktop and Windsurf, use the install tabs above.

›Does Karbon require an API key?

Yes. It expects KARBON_BEARER_TOKEN, KARBON_ACCESS_KEY, of which 2 are secrets.

›Can I use Karbon as a remote (hosted) MCP server?

No hosted endpoint is published; it runs locally over stdio.

›Is Karbon in the official MCP registry?

Yes, as io.github.Mad-Man-Dan/karbon-mcp-server.