ERPNext MCP Server

Instructions

Implementation Reference

• src/index.ts:489-527 (handler)

  Primary MCP tool handler for 'create_document'. Validates authentication and parameters, invokes ERPNextClient.createDocument, handles success/error responses.

  case "create_document": {
    if (!erpnext.isAuthenticated()) {
      return {
        content: [{
          type: "text",
          text: "Not authenticated with ERPNext. Please configure API key authentication."
        }],
        isError: true
      };
    }
    
    const doctype = String(request.params.arguments?.doctype);
    const data = request.params.arguments?.data as Record<string, any> | undefined;
    
    if (!doctype || !data) {
      throw new McpError(
        ErrorCode.InvalidParams,
        "Doctype and data are required"
      );
    }
    
    try {
      const result = await erpnext.createDocument(doctype, data);
      return {
        content: [{
          type: "text",
          text: `Created ${doctype}: ${result.name}\n\n${JSON.stringify(result, null, 2)}`
        }]
      };
    } catch (error: any) {
      return {
        content: [{
          type: "text",
          text: `Failed to create ${doctype}: ${error?.message || 'Unknown error'}`
        }],
        isError: true
      };
    }
  }

• src/index.ts:104-113 (helper)

  Core implementation in ERPNextClient that performs the HTTP POST request to ERPNext API to create a new document.

  async createDocument(doctype: string, doc: Record<string, any>): Promise<any> {
    try {
      const response = await this.axiosInstance.post(`/api/resource/${doctype}`, {
        data: doc
      });
      return response.data.data;
    } catch (error: any) {
      throw new Error(`Failed to create ${doctype}: ${error?.message || 'Unknown error'}`);
    }
  }

• src/index.ts:380-394 (schema)

  Input schema definition for the 'create_document' tool, specifying required 'doctype' and 'data' parameters.

  inputSchema: {
    type: "object",
    properties: {
      doctype: {
        type: "string",
        description: "ERPNext DocType (e.g., Customer, Item)"
      },
      data: {
        type: "object",
        additionalProperties: true,
        description: "Document data"
      }
    },
    required: ["doctype", "data"]
  }

• src/index.ts:377-395 (registration)

  Tool registration in the ListToolsRequestSchema handler, defining name, description, and input schema for 'create_document'.

  {
    name: "create_document",
    description: "Create a new document in ERPNext",
    inputSchema: {
      type: "object",
      properties: {
        doctype: {
          type: "string",
          description: "ERPNext DocType (e.g., Customer, Item)"
        },
        data: {
          type: "object",
          additionalProperties: true,
          description: "Document data"
        }
      },
      required: ["doctype", "data"]
    }
  },