@casys/mcp-erpnext

MCP server for ERPNext / Frappe ERP — 120 tools across 14 categories, with 7 interactive UI viewers.

Connect any MCP-compatible AI agent (Claude Desktop, Claude Code, VS Code Copilot, custom) to your ERPNext instance via the Model Context Protocol.

Works with self-hosted and ERPNext Cloud (frappe.cloud) instances.

What's New in v2.1

• Cross-viewer navigation — click a row in any list to drill down, click a button to open related documents in another viewer via sendMessage
• Inline detail panels — expand any row in doclist/stock viewers to see full document details + action buttons (Submit, Cancel, Payments)
• Interactive charts — click bar/pie/line data points to drill into underlying documents
• KPI drill-down — click the big number or sparkline to explore exceptions or trends
• Funnel redesign — trapezoid stages with gradient fills, conversion badges, click-through navigation
• Better error messages — Frappe API errors are now surfaced with full detail instead of generic "Tool execution failed"
• VS Code Copilot fix — schema validation issue with erpnext_doc_list filters resolved (#2)

Quick Start

Prerequisites

Generate API credentials in ERPNext:

1. Login to ERPNext → top-right menu → My Settings
2. Section API Access → Generate Keys
3. Copy API Key and API Secret

Claude Desktop / Claude Code (npm)

{
  "mcpServers": {
    "erpnext": {
      "command": "npx",
      "args": ["-y", "@casys/mcp-erpnext"],
      "env": {
        "ERPNEXT_URL": "http://localhost:8000",
        "ERPNEXT_API_KEY": "your-api-key",
        "ERPNEXT_API_SECRET": "your-api-secret"
      }
    }
  }
}

Works with ERPNext Cloud — set ERPNEXT_URL to your Frappe Cloud URL (e.g. https://mycompany.erpnext.com or https://mysite.frappe.cloud). API key authentication works the same way on self-hosted and cloud instances.

Zero dependencies — single self-contained bundle. Requires Node >= 20.

VS Code Copilot

Add to .vscode/mcp.json:

{
  "servers": {
    "erpnext": {
      "type": "stdio",
      "command": "npx",
      "args": ["-y", "@casys/mcp-erpnext"],
      "env": {
        "ERPNEXT_URL": "http://localhost:8000",
        "ERPNEXT_API_KEY": "your-api-key",
        "ERPNEXT_API_SECRET": "your-api-secret"
      }
    }
  }
}

Deno (stdio)

{
  "mcpServers": {
    "erpnext": {
      "command": "deno",
      "args": ["run", "--allow-all", "server.ts"],
      "env": {
        "ERPNEXT_URL": "http://localhost:8000",
        "ERPNEXT_API_KEY": "your-api-key",
        "ERPNEXT_API_SECRET": "your-api-secret"
      }
    }
  }
}

HTTP mode

ERPNEXT_URL=http://localhost:8000 \
ERPNEXT_API_KEY=xxx \
ERPNEXT_API_SECRET=xxx \
npx -y @casys/mcp-erpnext --http --port=3012

Category filtering

Load only the categories you need:

npx -y @casys/mcp-erpnext --categories=sales,inventory

Fresh Instance Setup

On a fresh ERPNext instance (no setup wizard), you need to create master data before using business tools. Use erpnext_doc_create for prerequisites:

1. Warehouse Types: Transit, Default
2. UOMs: Nos, Kg, Unit, Set, Meter
3. Item Groups: All Item Groups (is_group=1), then Products, Raw Material (parent=All Item Groups)
4. Territories: All Territories (is_group=1), then France, etc.
5. Customer Groups: All Customer Groups (is_group=1), then Commercial, etc.
6. Supplier Groups: All Supplier Groups (is_group=1), then Hardware, etc.
7. Company: requires Warehouse Types to exist first

UI Viewers

Seven interactive MCP Apps viewers, registered as ui://mcp-erpnext/{name}:

Cross-viewer navigation

Viewers communicate via app.sendMessage() — clicking a button in one viewer injects a message into the conversation, which triggers the AI to call the right tool and open the appropriate viewer. This creates a seamless drill-down experience without leaving the chat.

The server auto-injects navigation metadata into tool results:

• _rowAction — which tool to call when a row is clicked
• _sendMessageHints — navigation buttons shown in detail panels (e.g. "Orders", "Invoices")
• _drillDown / _trendDrillDown — sendMessage templates for KPI and chart click-through

Refresh model

All viewers carry a refreshRequest payload for safe revalidation via app.callServerTool():

• kanban-viewer revalidates after mutations and on focus
• All other viewers support focus refresh + manual refresh button

Building UI viewers

cd src/ui
npm install
node build-all.mjs

Tools (120)

14 categories covering the full ERPNext surface. Each _list tool returns interactive results in the doclist-viewer with row click, inline detail, and cross-viewer navigation.

Full tool reference with all parameters: docs/tools.md

Environment Variables

Architecture

server.ts           # MCP server (stdio + HTTP + inspector)
mod.ts              # Public API
deno.json           # Package config
src/
  api/
    frappe-client.ts  # Frappe REST HTTP client (zero-dependency)
    types.ts          # Frappe type definitions
  kanban/
    adapters/         # Per-DocType kanban adapters (task, opportunity, issue)
    definitions.ts    # Board registry
    types.ts          # Shared kanban contracts
  tools/
    sales.ts          # 17 sales tools
    inventory.ts      # 9 inventory tools
    purchasing.ts     # 11 purchasing tools
    accounting.ts     # 6 accounting tools
    hr.ts             # 12 HR tools
    project.ts        # 9 project tools
    delivery.ts       # 5 delivery tools
    manufacturing.ts  # 7 manufacturing tools
    crm.ts            # 8 CRM tools
    assets.ts         # 8 asset tools
    operations.ts     # 7 generic CRUD tools
    setup.ts          # 2 company/setup tools
    kanban.ts         # 2 read-write kanban tools
    analytics.ts      # 17 analytics tools (charts, KPIs, funnel)
    ui-refresh.ts     # Auto-inject _rowAction, _sendMessageHints, _drillDown
    mod.ts            # Tool registry
    types.ts          # Tool interface
  client.ts           # ErpNextToolsClient
  runtime.ts          # Deno runtime adapter
  runtime.node.ts     # Node.js runtime adapter
  ui/
    shared/           # ActionButton, InfoField, theme, branding, refresh
    doclist-viewer/   # Generic document list (inline detail, chip filters)
    invoice-viewer/   # Invoice display (item drill-down, actions)
    stock-viewer/     # Stock balance (detail panel, sendMessage)
    chart-viewer/     # Universal chart renderer (12 types, click drill-down)
    kanban-viewer/    # Read-write kanban (drag, edit, sendMessage)
    kpi-viewer/       # KPI card (clickable number + sparkline)
    funnel-viewer/    # Sales funnel (trapezoid stages, click-through)
    viewers.ts        # Viewer registry
tests/
  tools/              # Tool + ui-refresh + client tests
  kanban/             # Kanban adapter tests
  ui/                 # UI state + refresh tests
docs/
  ROADMAP.md          # Feature roadmap
  coverage.md         # Test coverage matrix

npm Package

The npm package (@casys/mcp-erpnext) is a single self-contained bundle with zero runtime dependencies. UI viewers are embedded.

Development

# Run tests (147 tests)
deno test --allow-all tests/

# Type check
deno check mod.ts server.ts

# Start HTTP server (dev)
deno task serve

# Launch MCP Inspector
deno task inspect

# Build UI viewers
deno task ui:build

# Dev a specific viewer with HMR
cd src/ui && npm run dev:kanban

License

MIT