Václav Čikl This workflow corresponds to n8n.io template #13987 — we link there as the canonical source.
This workflow follows the Agent → Chat Trigger recipe pattern — see all workflows that pair these two integrations.
The workflow JSON
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{
"id": "AS7I34jGoqYKavxt",
"meta": {
"templateCredsSetupCompleted": true
},
"name": "AI Invoice Assistant_TEMPLATE",
"tags": [],
"nodes": [
{
"id": "343031fe-b861-4e20-b2c5-acc8757ef37a",
"name": "Simple Memory",
"type": "@n8n/n8n-nodes-langchain.memoryBufferWindow",
"position": [
-1344,
-128
],
"parameters": {
"contextWindowLength": 10
},
"typeVersion": 1.3
},
{
"id": "b8729a40-f11a-4ca0-83af-73e67379af28",
"name": "INVOICE_PAYMENT",
"type": "@n8n/n8n-nodes-langchain.toolWorkflow",
"position": [
-512,
128
],
"parameters": {
"workflowId": {
"__rl": true,
"mode": "list",
"value": "nM6KDKEpkqatSCQc",
"cachedResultUrl": "/workflow/nM6KDKEpkqatSCQc",
"cachedResultName": "Fakturoid_invoice_paymentTEMPLATE"
},
"description": "Mark invoice as paid or record payment. If paid_on date is provided, marks invoice as fully paid on that date. Requires invoice_id from fakturoid_get_invoice.",
"workflowInputs": {
"value": {
"paid_on": "={{ /*n8n-auto-generated-fromAI-override*/ $fromAI('paid_on', `Payment date in YYYY-MM-DD format (e.g., '2024-02-09'). Defaults to today if not provided.`, 'string') }}",
"invoice_id": "={{ /*n8n-auto-generated-fromAI-override*/ $fromAI('invoice_id', `ID of invoice to delete (required). Get this from fakturoid_get_invoice.`, 'number') }}",
"payment_method": "={{ /*n8n-auto-generated-fromAI-override*/ $fromAI('payment_method', `Payment method (optional): 'bank_transfer', 'cash', 'card', 'paypal'`, 'string') }}"
},
"schema": [
{
"id": "invoice_id",
"type": "number",
"display": true,
"removed": false,
"required": false,
"displayName": "invoice_id",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "paid_on",
"type": "string",
"display": true,
"removed": false,
"required": false,
"displayName": "paid_on",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "payment_method",
"type": "string",
"display": true,
"removed": false,
"required": false,
"displayName": "payment_method",
"defaultMatch": false,
"canBeUsedToMatch": true
}
],
"mappingMode": "defineBelow",
"matchingColumns": [],
"attemptToConvertTypes": false,
"convertFieldsToString": false
}
},
"typeVersion": 2.2
},
{
"id": "1e9ca13d-3650-46aa-8d3c-2395f3ccb290",
"name": "UPDATE_SUBJECT",
"type": "@n8n/n8n-nodes-langchain.toolWorkflow",
"position": [
-1104,
48
],
"parameters": {
"workflowId": {
"__rl": true,
"mode": "list",
"value": "jXIz2pM85LjrUfyp",
"cachedResultUrl": "/workflow/jXIz2pM85LjrUfyp",
"cachedResultName": "Fakturoid_update_subject_TEMPLATE"
},
"description": "Update existing contact/client in Fakturoid. Only provided fields will be updated, others remain unchanged. Requires subject_id from fakturoid_get_subject.",
"workflowInputs": {
"value": {
"dic": "={{ /*n8n-auto-generated-fromAI-override*/ $fromAI('dic', `Updated DI\u010c`, 'string') }}",
"ico": "={{ /*n8n-auto-generated-fromAI-override*/ $fromAI('ico', `Updated I\u010cO. This is not subject_id`, 'string') }}",
"zip": "={{ /*n8n-auto-generated-fromAI-override*/ $fromAI('zip', `Updated ZIP code`, 'string') }}",
"city": "={{ /*n8n-auto-generated-fromAI-override*/ $fromAI('city', `Updated city`, 'string') }}",
"name": "={{ /*n8n-auto-generated-fromAI-override*/ $fromAI('name', `Updated company/person name`, 'string') }}",
"email": "={{ /*n8n-auto-generated-fromAI-override*/ $fromAI('email', `Updated email`, 'string') }}",
"phone": "={{ /*n8n-auto-generated-fromAI-override*/ $fromAI('phone', `Updated phone`, 'string') }}",
"street": "={{ /*n8n-auto-generated-fromAI-override*/ $fromAI('street', `Updated street address`, 'string') }}",
"subject_id": "={{ /*n8n-auto-generated-fromAI-override*/ $fromAI('subject_id', `ID of subject to update (required). Get this from fakturoid_get_subject. THIS IS NOT ico. `, 'string') }}"
},
"schema": [
{
"id": "subject_id",
"type": "string",
"display": true,
"removed": false,
"required": false,
"displayName": "subject_id",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "name",
"type": "string",
"display": true,
"removed": false,
"required": false,
"displayName": "name",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "ico",
"type": "string",
"display": true,
"removed": false,
"required": false,
"displayName": "ico",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "dic",
"type": "string",
"display": true,
"removed": false,
"required": false,
"displayName": "dic",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "street",
"type": "string",
"display": true,
"removed": false,
"required": false,
"displayName": "street",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "city",
"type": "string",
"display": true,
"removed": false,
"required": false,
"displayName": "city",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "zip",
"type": "string",
"display": true,
"removed": false,
"required": false,
"displayName": "zip",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "email",
"type": "string",
"display": true,
"removed": false,
"required": false,
"displayName": "email",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "phone",
"type": "string",
"display": true,
"removed": false,
"required": false,
"displayName": "phone",
"defaultMatch": false,
"canBeUsedToMatch": true
}
],
"mappingMode": "defineBelow",
"matchingColumns": [],
"attemptToConvertTypes": false,
"convertFieldsToString": false
}
},
"typeVersion": 2.2
},
{
"id": "06ec1af9-32eb-4f1d-9486-7aafd75adfe9",
"name": "CREATE_SUBJECT",
"type": "@n8n/n8n-nodes-langchain.toolWorkflow",
"position": [
-1216,
144
],
"parameters": {
"workflowId": {
"__rl": true,
"mode": "list",
"value": "XW7U0YtRiZeMpCRi",
"cachedResultUrl": "/workflow/XW7U0YtRiZeMpCRi",
"cachedResultName": "Fakturoid_create_subject_TEMPLATE"
},
"description": "Create new subject/ contact /client in Fakturoid. Use data from ares_lookup if available to auto-fill fields. Returns subject_id needed for creating invoices.",
"workflowInputs": {
"value": {
"dic": "={{ /*n8n-auto-generated-fromAI-override*/ $fromAI('dic', `DI\u010c (VAT number)`, 'string') }}",
"ico": "={{ /*n8n-auto-generated-fromAI-override*/ $fromAI('ico', `8-digit I\u010cO (registration number)`, 'string') }}",
"zip": "={{ /*n8n-auto-generated-fromAI-override*/ $fromAI('zip', `ZIP/postal code`, 'string') }}",
"city": "={{ /*n8n-auto-generated-fromAI-override*/ $fromAI('city', `City name`, 'string') }}",
"name": "={{ /*n8n-auto-generated-fromAI-override*/ $fromAI('name', `Company or person name (required)`, 'string') }}",
"email": "={{ /*n8n-auto-generated-fromAI-override*/ $fromAI('email', `Email address`, 'string') }}",
"phone": "={{ /*n8n-auto-generated-fromAI-override*/ $fromAI('phone', `Phone number`, 'string') }}",
"street": "={{ /*n8n-auto-generated-fromAI-override*/ $fromAI('street', `Street address`, 'string') }}"
},
"schema": [
{
"id": "name",
"type": "string",
"display": true,
"removed": false,
"required": false,
"displayName": "name",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "ico",
"type": "string",
"display": true,
"removed": false,
"required": false,
"displayName": "ico",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "email",
"type": "string",
"display": true,
"removed": false,
"required": false,
"displayName": "email",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "phone",
"type": "string",
"display": true,
"removed": false,
"required": false,
"displayName": "phone",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "street",
"type": "string",
"display": true,
"removed": false,
"required": false,
"displayName": "street",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "city",
"type": "string",
"display": true,
"removed": false,
"required": false,
"displayName": "city",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "zip",
"type": "string",
"display": true,
"removed": false,
"required": false,
"displayName": "zip",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "dic",
"type": "string",
"display": true,
"removed": false,
"required": false,
"displayName": "dic",
"defaultMatch": false,
"canBeUsedToMatch": true
}
],
"mappingMode": "defineBelow",
"matchingColumns": [],
"attemptToConvertTypes": false,
"convertFieldsToString": false
}
},
"typeVersion": 2.2
},
{
"id": "1f9f5a09-21bf-4498-9dbf-094848309739",
"name": "GET_SUBJECT",
"type": "@n8n/n8n-nodes-langchain.toolWorkflow",
"position": [
-1312,
48
],
"parameters": {
"workflowId": {
"__rl": true,
"mode": "list",
"value": "x2F0ZxrGsSSVMsHp",
"cachedResultUrl": "/workflow/x2F0ZxrGsSSVMsHp",
"cachedResultName": "Fakturoid_get_subject_TEMPLATE"
},
"description": "Search for existing contacts/clients in Fakturoid by name, I\u010cO, email, or phone. Returns contact details including subject_id needed for creating invoices. ALWAYS use this before creating new contact to avoid duplicates.",
"workflowInputs": {
"value": {
"query": "={{ /*n8n-auto-generated-fromAI-override*/ $fromAI('query', `Search term - can be company name, I\u010cO (8 digits), email address, or phone number. Prefer I\u010cO if available for most accurate match.`, 'string') }}"
},
"schema": [
{
"id": "query",
"type": "string",
"display": true,
"removed": false,
"required": false,
"displayName": "query",
"defaultMatch": false,
"canBeUsedToMatch": true
}
],
"mappingMode": "defineBelow",
"matchingColumns": [
"query"
],
"attemptToConvertTypes": false,
"convertFieldsToString": false
}
},
"typeVersion": 2.2
},
{
"id": "06f507a2-33f0-47c8-a077-a6e3f83a88f5",
"name": "ARES LOOKUP",
"type": "@n8n/n8n-nodes-langchain.toolWorkflow",
"position": [
-1424,
112
],
"parameters": {
"workflowId": {
"__rl": true,
"mode": "list",
"value": "Y8AeWLK8FzC3kZYmAVhVf",
"cachedResultUrl": "/workflow/Y8AeWLK8FzC3kZYmAVhVf",
"cachedResultName": "ARESCaller"
},
"description": "Search Czech business registry (ARES) by company I\u010cO (8-digit registration number) or company name. Returns company details including I\u010cO, DI\u010c, full legal name, and address. Use this to auto-fill company data when creating contacts.",
"workflowInputs": {
"value": {
"ICO": "={{ /*n8n-auto-generated-fromAI-override*/ $fromAI('ICO', `8-digit company registration number (I\u010cO). Prefer this over name for most accurate results.`, 'number') }}",
"CompanyName": "={{ /*n8n-auto-generated-fromAI-override*/ $fromAI('CompanyName', `Company name to search for. Use if I\u010cO is not available.`, 'string') }}"
},
"schema": [
{
"id": "ICO",
"type": "number",
"display": true,
"removed": false,
"required": false,
"displayName": "ICO",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "CompanyName",
"type": "string",
"display": true,
"removed": false,
"required": false,
"displayName": "CompanyName",
"defaultMatch": false,
"canBeUsedToMatch": true
}
],
"mappingMode": "defineBelow",
"matchingColumns": [],
"attemptToConvertTypes": false,
"convertFieldsToString": false
}
},
"typeVersion": 2.2
},
{
"id": "692a8457-2540-4382-a196-614673593cac",
"name": "Sticky Note",
"type": "n8n-nodes-base.stickyNote",
"position": [
-1456,
16
],
"parameters": {
"color": 6,
"width": 576,
"height": 272,
"content": "\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n## CONTACTS"
},
"typeVersion": 1
},
{
"id": "c692e7e2-9d78-43f5-88eb-b04448c7b707",
"name": "CREATE_INVOICE",
"type": "@n8n/n8n-nodes-langchain.toolWorkflow",
"position": [
-816,
32
],
"parameters": {
"workflowId": {
"__rl": true,
"mode": "list",
"value": "Otewvb4hm364Skd2",
"cachedResultUrl": "/workflow/Otewvb4hm364Skd2",
"cachedResultName": "Fakturoid_create_invoice_TEMPLATE"
},
"description": "Create new invoice in Fakturoid for existing subject. ALWAYS show user a summary with item breakdown and total amount, then ask for confirmation before creating. Returns invoice_id, number, and Public PDF URL.",
"workflowInputs": {
"value": {
"note": "={{ /*n8n-auto-generated-fromAI-override*/ $fromAI('note', `Optional note`, 'string') }}",
"lines": "={{ /*n8n-auto-generated-fromAI-override*/ $fromAI('lines', `Lines must use exactly these field names: name (string), quantity (number), unit_price (number). Do NOT use amount, price, or unit.`, 'json') }}",
"subject_id": "={{ /*n8n-auto-generated-fromAI-override*/ $fromAI('subject_id', `ID of existing subject/contact (required). Get this from fakturoid_get_subject`, 'number') }}"
},
"schema": [
{
"id": "subject_id",
"type": "number",
"display": true,
"removed": false,
"required": false,
"displayName": "subject_id",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "lines",
"type": "array",
"display": true,
"removed": false,
"required": false,
"displayName": "lines",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "note",
"type": "string",
"display": true,
"removed": false,
"required": false,
"displayName": "note",
"defaultMatch": false,
"canBeUsedToMatch": true
}
],
"mappingMode": "defineBelow",
"matchingColumns": [],
"attemptToConvertTypes": false,
"convertFieldsToString": false
}
},
"typeVersion": 2.2
},
{
"id": "820b8624-3880-43b7-8ddb-d27980438db2",
"name": "GET_INVOICE",
"type": "@n8n/n8n-nodes-langchain.toolWorkflow",
"position": [
-720,
128
],
"parameters": {
"workflowId": {
"__rl": true,
"mode": "list",
"value": "oNKwEN15gPaAWSsu",
"cachedResultUrl": "/workflow/oNKwEN15gPaAWSsu",
"cachedResultName": "Fakturoid_get_invoice_TEMPLATE"
},
"description": "Search for invoices or get invoice detail. Can search by invoice number, subject name, or list recent invoices. Returns invoice_id, number, amounts, status, and PDF links.",
"workflowInputs": {
"value": {
"limit": "={{ /*n8n-auto-generated-fromAI-override*/ $fromAI('limit', `Max results (default: 10)`, 'number') }}",
"query": "={{ /*n8n-auto-generated-fromAI-override*/ $fromAI('query', `Search term - invoice number, client name, etc.`, 'string') }}",
"Invoice_id": "={{ /*n8n-auto-generated-fromAI-override*/ $fromAI('Invoice_id', `Specific invoice ID to fetch detail`, 'string') }}"
},
"schema": [
{
"id": "Invoice_id",
"type": "string",
"display": true,
"removed": false,
"required": false,
"displayName": "Invoice_id",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "query",
"type": "string",
"display": true,
"removed": false,
"required": false,
"displayName": "query",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "limit",
"type": "number",
"display": true,
"removed": false,
"required": false,
"displayName": "limit",
"defaultMatch": false,
"canBeUsedToMatch": true
}
],
"mappingMode": "defineBelow",
"matchingColumns": [
"parameters"
],
"attemptToConvertTypes": false,
"convertFieldsToString": false
}
},
"typeVersion": 2.2
},
{
"id": "f9242984-dd15-410a-82d2-8ae45880aa5b",
"name": "DELETE_INVOICE",
"type": "@n8n/n8n-nodes-langchain.toolWorkflow",
"position": [
-624,
32
],
"parameters": {
"workflowId": {
"__rl": true,
"mode": "list",
"value": "LsmsxYwHnMcbKjet",
"cachedResultUrl": "/workflow/LsmsxYwHnMcbKjet",
"cachedResultName": "Fakturoid_delete_invoice_TEMPLATE"
},
"description": "Delete invoice from Fakturoid. Can only delete unpaid invoices. ALWAYS ask user for confirmation before deleting. Requires invoice_id from fakturoid_get_invoice. USE IT ONLY FOR DELETING INVOICES.",
"workflowInputs": {
"value": {
"invoice_id": "={{ /*n8n-auto-generated-fromAI-override*/ $fromAI('invoice_id', `ID of invoice to delete (required). Get this from fakturoid_get_invoice.`, 'number') }}"
},
"schema": [
{
"id": "invoice_id",
"type": "number",
"display": true,
"removed": false,
"required": false,
"displayName": "invoice_id",
"defaultMatch": false,
"canBeUsedToMatch": true
}
],
"mappingMode": "defineBelow",
"matchingColumns": [
"invoice_id"
],
"attemptToConvertTypes": false,
"convertFieldsToString": false
}
},
"typeVersion": 2.2
},
{
"id": "0d1de8a5-a7e7-4ee5-a04f-579be8a55b2f",
"name": "Sticky Note1",
"type": "n8n-nodes-base.stickyNote",
"position": [
-864,
16
],
"parameters": {
"color": 5,
"width": 592,
"height": 272,
"content": "\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n## INVOICES"
},
"typeVersion": 1
},
{
"id": "a960e53a-bca3-4eab-9734-2fbb191877fe",
"name": "UPDATE_INVOICE",
"type": "@n8n/n8n-nodes-langchain.toolWorkflow",
"position": [
-416,
32
],
"parameters": {
"workflowId": {
"__rl": true,
"mode": "list",
"value": "TpOq2gGQ25lbInlm",
"cachedResultUrl": "/workflow/TpOq2gGQ25lbInlm",
"cachedResultName": "Fakturoid_update_invoice_TEMPLATE"
},
"description": "Update existing invoice. Can change due date, add notes, or update invoice number. Only provided fields will be changed. Requires invoice_id from fakturoid_get_invoice.",
"workflowInputs": {
"value": {
"note": "={{ /*n8n-auto-generated-fromAI-override*/ $fromAI('note', `Public note visible on invoice`, 'string') }}",
"due_on": "={{ /*n8n-auto-generated-fromAI-override*/ $fromAI('due_on', `New due date in YYYY-MM-DD format (e.g., '2024-03-31')`, 'string') }}",
"number": "={{ /*n8n-auto-generated-fromAI-override*/ $fromAI('number', `Invoice number`, 'string') }}",
"invoice_id": "={{ /*n8n-auto-generated-fromAI-override*/ $fromAI('invoice_id', `ID of invoice to update (required). Get this from fakturoid_get_invoice.`, 'number') }}",
"private_note": "={{ /*n8n-auto-generated-fromAI-override*/ $fromAI('private_note', `Private internal note (not visible to client)`, 'string') }}"
},
"schema": [
{
"id": "invoice_id",
"type": "number",
"display": true,
"removed": false,
"required": false,
"displayName": "invoice_id",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "due_on",
"type": "string",
"display": true,
"removed": false,
"required": false,
"displayName": "due_on",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "note",
"type": "string",
"display": true,
"removed": false,
"required": false,
"displayName": "note",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "private_note",
"type": "string",
"display": true,
"removed": false,
"required": false,
"displayName": "private_note",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "number",
"type": "string",
"display": true,
"removed": false,
"required": false,
"displayName": "number",
"defaultMatch": false,
"canBeUsedToMatch": true
}
],
"mappingMode": "defineBelow",
"matchingColumns": [],
"attemptToConvertTypes": false,
"convertFieldsToString": false
}
},
"typeVersion": 2.2
},
{
"id": "34049bb6-a8f5-47f0-aa14-b74119dc33f6",
"name": "DELETE_SUBJECT",
"type": "@n8n/n8n-nodes-langchain.toolWorkflow",
"position": [
-992,
144
],
"parameters": {
"workflowId": {
"__rl": true,
"mode": "list",
"value": "CcYWBnucFh1OoivN",
"cachedResultUrl": "/workflow/CcYWBnucFh1OoivN",
"cachedResultName": "Fakturoid_delete_subject_TEMPLATE"
},
"description": "Delete subject/ contact /client in Fakturoid by subject_id.",
"workflowInputs": {
"value": {
"subject_id": "={{ /*n8n-auto-generated-fromAI-override*/ $fromAI('subject_id', `ID of subject to update (required). Get this from fakturoid_get_subject. `, 'number') }}"
},
"schema": [
{
"id": "subject_id",
"type": "number",
"display": true,
"removed": false,
"required": false,
"displayName": "subject_id",
"defaultMatch": false,
"canBeUsedToMatch": true
}
],
"mappingMode": "defineBelow",
"matchingColumns": [
"subject_id"
],
"attemptToConvertTypes": false,
"convertFieldsToString": false
}
},
"typeVersion": 2.2
},
{
"id": "c963c5f2-f9fe-4949-b5cd-3ed6d1b6d584",
"name": "AI Agent1",
"type": "@n8n/n8n-nodes-langchain.agent",
"position": [
-1040,
-288
],
"parameters": {
"options": {
"systemMessage": "# Invoice Bot\u00edk \u2013 System Prompt\n\nYou are an invoice and contact management assistant for Czech freelancers and businesses. You communicate in Czech.\n\n---\n\n## Available Tools\n\n**ARES Registry:**\n- `ares_lookup` \u2013 Search company by I\u010cO or name\n\n**Contacts:**\n- `fakturoid_get_subject` \u2013 Search contacts\n- `fakturoid_create_subject` \u2013 Create new contact\n- `fakturoid_update_subject` \u2013 Update contact details\n- `fakturoid_delete_subject` \u2013 Delete contact\n\n**Invoices:**\n- `fakturoid_get_invoice` \u2013 Search/list invoices\n- `fakturoid_create_invoice` \u2013 Create invoice\n- `fakturoid_update_invoice` \u2013 Update invoice\n- `fakturoid_delete_invoice` \u2013 Delete invoice\n- `fakturoid_invoice_payment` \u2013 Mark invoice as paid\n\n---\n\n## Entity IDs \u2013 CRITICAL RULES\n\nThe system works with two distinct entity types. Their IDs are DIFFERENT values and must NEVER be confused:\n\n| Entity | ID field | Obtained from | Used for |\n|---|---|---|---|\n| Contact (subject) | `subject_id` | `fakturoid_get_subject` | `create_invoice`, `update_subject`, `delete_subject` |\n| Invoice | `invoice_id` | `fakturoid_get_invoice` | `update_invoice`, `delete_invoice`, `invoice_payment` |\n\n**Rules:**\n1. After every tool call, explicitly remember the returned ID and its type (`subject_id` or `invoice_id`)\n2. `subject_id` from `get_subject` is ALWAYS a different value than `invoice_id` from `get_invoice` \u2013 never mix them up\n3. Before calling `update_invoice` or `delete_invoice`, always verify you are using `invoice_id` (not `subject_id`)\n4. Before calling `create_invoice`, always verify that `subject_id` comes from a `get_subject` result \u2013 NEVER use an `invoice_id` as `subject_id`\n5. If you are unsure about the correct ID, call the appropriate get tool again \u2013 NEVER reuse an ID from a different entity\n6. NEVER guess or fabricate IDs \u2013 they must always come from a tool response\n7. After deleting an invoice, the `invoice_id` is invalid and must be discarded \u2013 if the user then asks to create a new invoice, use the `subject_id` from `get_subject` context, NOT the deleted `invoice_id`\n\nBefore calling any write tool (`create_invoice`, `update_invoice`, `delete_invoice`, `invoice_payment`), reason through the following in a `<thinking>` block (never shown to user):\n- What is the subject_id I have, and where did it come from?\n- What is the invoice_id I have, and where did it come from?\n- Which ID does this action require, and am I using the correct one?\n\n---\n\n## General Rules\n\n1. Use tools only for their intended purpose (subject tools for contacts, invoice tools for invoices)\n2. If the user requests an action for which you have no tool, respond: \u201eTuto akci nem\u00e1m k dispozici\"\n3. Always ask for confirmation before: creating an invoice, deleting, marking as paid\n4. Show a summary before destructive actions (delete, mark as paid)\n\n---\n\n## Conversation Context \u2013 IMPORTANT\n\n- If a contact or invoice was already fetched earlier in the conversation, use that data directly \u2013 do NOT fetch it again\n- If the user refers to a contact or invoice that was already discussed (e.g. \u201emu\", \u201ej\u00ed\", \u201et\u00e9 faktu\u0159e\"), resolve the reference from conversation history\n- Only call `get_subject` if you genuinely do not have the `subject_id` yet\n\n---\n\n## Invoice Creation \u2013 Keep It Lean\n\nWhen creating an invoice, collect only what is necessary:\n- **Contact**: resolve from conversation context if already known, otherwise call `get_subject`\n- **Line items**: infer name, quantity and price from what the user said. Ask only for what is genuinely missing\n- **Notes**: do NOT ask about notes unless the user brings them up\n- Once you have contact + line items, show a single confirmation summary and wait for approval\n- After approval, create the invoice immediately \u2013 no re-fetching, no second confirmation\n\n---\n\n## Workflows\n\n### Creating an Invoice\n1. Resolve contact \u2192 use `subject_id` from conversation context if available, otherwise call `get_subject`\n2. If contact not found \u2192 `ares_lookup`, offer to create the contact\n3. Infer line items from user input. Ask only for genuinely missing information (do not ask for notes unprompted)\n4. Show a single summary with items and total, ask for confirmation\n5. On confirmation, call `create_invoice` immediately using the `subject_id` already in context\n\n### Creating a Contact\n1. If I\u010cO is provided \u2192 `ares_lookup`\n2. Show the data, ask for confirmation\n3. Create the contact\n\n### Updating an Invoice\n1. Resolve invoice \u2192 use `invoice_id` from conversation context if available, otherwise call `get_invoice`\n2. Show current value and proposed change, ask for confirmation\n3. On confirmation, call `update_invoice` immediately using the `invoice_id` already in context\n\n### Deleting an Invoice\n1. Resolve invoice \u2192 use `invoice_id` from conversation context if available, otherwise call `get_invoice`\n2. Show invoice summary, ask for confirmation\n3. On confirmation, call `delete_invoice` using the `invoice_id` \u2013 nothing else\n4. After successful deletion, the `invoice_id` is no longer valid \u2013 do NOT use it for any further action\n5. Do NOT call `create_invoice` after deletion unless the user explicitly asks to create a new invoice\n\n---\n\n## Confirmation Flow \u2013 Important\n\n- Once the user confirms an action (e.g. \u201eAno\"), execute it IMMEDIATELY\n- Do NOT ask the same confirmation question again\n- Do NOT re-fetch entities you already have from earlier tool calls in the same conversation\n- Repeating confirmations or lookups is an error\n\n---\n\n## Formatting\n\n- Currency: \u201e5 000 K\u010d\"\n- Dates: \u201e9. \u00fanora 2024\"\n- Invoice numbers: \u201eFaktura 2026-0003\""
}
},
"typeVersion": 3.1
},
{
"id": "f59b00a5-bb66-41b8-8608-737bf60c726c",
"name": "When chat message received",
"type": "@n8n/n8n-nodes-langchain.chatTrigger",
"position": [
-1440,
-320
],
"parameters": {
"options": {}
},
"typeVersion": 1.4
},
{
"id": "5975bc1a-38e6-45da-b888-73c74a36b345",
"name": "GPT-5-mini",
"type": "@n8n/n8n-nodes-langchain.lmChatOpenAi",
"position": [
-1456,
-112
],
"parameters": {
"options": {}
},
"credentials": {
"openAiApi": {
"name": "<your credential>"
}
},
"typeVersion": 1
},
{
"id": "a808fbc9-1f59-4afe-bd63-580113a6d74f",
"name": "Sticky Note2",
"type": "n8n-nodes-base.stickyNote",
"position": [
-1888,
-336
],
"parameters": {
"color": "#C34B4B",
"width": 400,
"height": 624,
"content": "## How it works\n\nAI agent connected to Fakturoid API and ARES registry. Handles invoicing and contact management through natural Czech conversation \u2014 no forms, no clicking.\n\n**What the agent can do:**\n- Search, create, update and delete contacts (with ARES lookup for auto-fill)\n- Search, create, update and delete invoices\n- Mark invoices as paid\n\n**Architecture:**\nThe agent workflow connects to 10 sub-workflows as tools \u2014 each handles one Fakturoid operation. Sub-workflows normalize API responses and pass only relevant fields back to the agent.\n\n## Setup steps\n\n1. Add your **Fakturoid API token** and **account slug** to the Fakturoid HTTP Request nodes\n2. Connect your **LLM credentials** (OpenAI, Anthropic, or any compatible provider) to the AI Agent node\n3. Activate all sub-workflows before activating the main agent workflow\n4. Open the chat and start invoicing"
},
"typeVersion": 1
}
],
"active": true,
"settings": {
"availableInMCP": false,
"executionOrder": "v1"
},
"versionId": "171164bf-0a64-44e8-8e6e-761dd354d4be",
"connections": {
"GPT-5-mini": {
"ai_languageModel": [
[
{
"node": "AI Agent1",
"type": "ai_languageModel",
"index": 0
}
]
]
},
"ARES LOOKUP": {
"ai_tool": [
[
{
"node": "AI Agent1",
"type": "ai_tool",
"index": 0
}
]
]
},
"GET_INVOICE": {
"ai_tool": [
[
{
"node": "AI Agent1",
"type": "ai_tool",
"index": 0
}
]
]
},
"GET_SUBJECT": {
"ai_tool": [
[
{
"node": "AI Agent1",
"type": "ai_tool",
"index": 0
}
]
]
},
"Simple Memory": {
"ai_memory": [
[
{
"node": "AI Agent1",
"type": "ai_memory",
"index": 0
}
]
]
},
"CREATE_INVOICE": {
"ai_tool": [
[
{
"node": "AI Agent1",
"type": "ai_tool",
"index": 0
}
]
]
},
"CREATE_SUBJECT": {
"ai_tool": [
[
{
"node": "AI Agent1",
"type": "ai_tool",
"index": 0
}
]
]
},
"DELETE_INVOICE": {
"ai_tool": [
[
{
"node": "AI Agent1",
"type": "ai_tool",
"index": 0
}
]
]
},
"DELETE_SUBJECT": {
"ai_tool": [
[
{
"node": "AI Agent1",
"type": "ai_tool",
"index": 0
}
]
]
},
"UPDATE_INVOICE": {
"ai_tool": [
[
{
"node": "AI Agent1",
"type": "ai_tool",
"index": 0
}
]
]
},
"UPDATE_SUBJECT": {
"ai_tool": [
[
{
"node": "AI Agent1",
"type": "ai_tool",
"index": 0
}
]
]
},
"INVOICE_PAYMENT": {
"ai_tool": [
[
{
"node": "AI Agent1",
"type": "ai_tool",
"index": 0
}
]
]
},
"When chat message received": {
"main": [
[
{
"node": "AI Agent1",
"type": "main",
"index": 0
}
]
]
}
}
}
Credentials you'll need
Each integration node will prompt for credentials when you import. We strip credential IDs before publishing — you'll add your own.
openAiApi
Pro
For the full experience including quality scoring and batch install features for each workflow upgrade to Pro
About this workflow
Fakturoid AI Agent is an AI-powered invoicing assistant for Czech freelancers and small businesses. It connects to Fakturoid — the most popular Czech invoicing platform — and lets you manage invoices and contacts through natural conversation. No switching tabs, no filling forms.…
Source: https://n8n.io/workflows/13987/ — original creator credit. Request a take-down →
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