diff --git a/apps/mana/apps/web/src/lib/data/tools/init.ts b/apps/mana/apps/web/src/lib/data/tools/init.ts
index dbf53975d..4b4468abd 100644
--- a/apps/mana/apps/web/src/lib/data/tools/init.ts
+++ b/apps/mana/apps/web/src/lib/data/tools/init.ts
@@ -41,6 +41,7 @@ import { moodTools } from '$lib/modules/mood/tools';
 import { wishesTools } from '$lib/modules/wishes/tools';
 import { wetterTools } from '$lib/modules/wetter/tools';
 import { quizTools } from '$lib/modules/quiz/tools';
+import { invoicesTools } from '$lib/modules/invoices/tools';
 
 let initialized = false;
 
@@ -83,5 +84,6 @@ export function initTools(): void {
 	registerTools(wishesTools);
 	registerTools(wetterTools);
 	registerTools(quizTools);
+	registerTools(invoicesTools);
 	initialized = true;
 }
diff --git a/apps/mana/apps/web/src/lib/data/tools/types.ts b/apps/mana/apps/web/src/lib/data/tools/types.ts
index 9fea87ac5..f5cbee87a 100644
--- a/apps/mana/apps/web/src/lib/data/tools/types.ts
+++ b/apps/mana/apps/web/src/lib/data/tools/types.ts
@@ -21,7 +21,10 @@ export interface ModuleTool {
 
 export interface ToolParameter {
 	name: string;
-	type: 'string' | 'number' | 'boolean';
+	/** JSON Schema primitive types. `array` / `object` used by tools that
+	 *  accept structured payloads (e.g. invoice line items) — parsing
+	 *  is the tool's responsibility inside execute(). */
+	type: 'string' | 'number' | 'boolean' | 'array' | 'object';
 	description: string;
 	required: boolean;
 	enum?: string[];
diff --git a/apps/mana/apps/web/src/lib/modules/invoices/index.ts b/apps/mana/apps/web/src/lib/modules/invoices/index.ts
index a8c7b80b1..808dd4110 100644
--- a/apps/mana/apps/web/src/lib/modules/invoices/index.ts
+++ b/apps/mana/apps/web/src/lib/modules/invoices/index.ts
@@ -40,6 +40,8 @@ export { generateSCORReference, QRBillError } from './pdf/qr-bill';
 export { invoicesStore } from './stores/invoices.svelte';
 export { invoiceSettingsStore, ensureSettings } from './stores/settings.svelte';
 
+export { invoicesTools } from './tools';
+
 export type {
 	LocalInvoice,
 	LocalInvoiceLine,
diff --git a/apps/mana/apps/web/src/lib/modules/invoices/tools.ts b/apps/mana/apps/web/src/lib/modules/invoices/tools.ts
new file mode 100644
index 000000000..606433429
--- /dev/null
+++ b/apps/mana/apps/web/src/lib/modules/invoices/tools.ts
@@ -0,0 +1,301 @@
+/**
+ * Invoice Tools — LLM-accessible operations.
+ *
+ * Schema definitions live in @mana/shared-ai's AI_TOOL_CATALOG (the SSOT);
+ * this file provides the matching `execute` fns that call the local store.
+ * Amounts arrive from the LLM in major units (CHF 150.00) and get
+ * converted to minor units (15000) here.
+ */
+
+import type { ModuleTool } from '$lib/data/tools/types';
+import { invoiceTable } from './collections';
+import { decryptRecords } from '$lib/data/crypto';
+import { invoicesStore } from './stores/invoices.svelte';
+import { toInvoice, computeStats, formatAmount } from './queries';
+import { CURRENCIES } from './constants';
+import type {
+	LocalInvoice,
+	LocalInvoiceLine,
+	Invoice,
+	InvoiceStatus,
+	Currency,
+	InvoiceClientSnapshot,
+} from './types';
+
+// ─── Helpers ────────────────────────────────────────────
+
+async function listDecryptedInvoices(): Promise<Invoice[]> {
+	const rows = await invoiceTable.toArray();
+	const visible = rows.filter((r) => !r.deletedAt);
+	const decrypted = await decryptRecords<LocalInvoice>('invoices', visible);
+	const today = new Date().toISOString().slice(0, 10);
+	return decrypted.map((local) => {
+		const inv = toInvoice(local);
+		if (inv.status === 'sent' && inv.dueDate < today) {
+			return { ...inv, status: 'overdue' as InvoiceStatus };
+		}
+		return inv;
+	});
+}
+
+interface RawLine {
+	title?: string;
+	quantity?: number;
+	unitPrice?: number;
+	vatRate?: number;
+	unit?: string;
+	description?: string;
+	discount?: number;
+}
+
+/**
+ * Coerce whatever the LLM produced for `lines` into LocalInvoiceLine[].
+ * Accepts either a real array or a JSON-stringified one (some planners
+ * emit strings for array params). Rejects when no usable entries remain.
+ */
+function coerceLines(raw: unknown, currency: Currency, defaultVatRate: number): LocalInvoiceLine[] {
+	let parsed: RawLine[];
+	if (typeof raw === 'string') {
+		try {
+			parsed = JSON.parse(raw) as RawLine[];
+		} catch {
+			throw new Error('Positionen konnten nicht geparst werden (ungültiges JSON).');
+		}
+	} else if (Array.isArray(raw)) {
+		parsed = raw as RawLine[];
+	} else {
+		throw new Error('Positionen müssen als Array übergeben werden.');
+	}
+
+	const minor = CURRENCIES[currency].minorUnit;
+	const lines: LocalInvoiceLine[] = [];
+	for (const p of parsed) {
+		if (!p.title || typeof p.quantity !== 'number' || typeof p.unitPrice !== 'number') {
+			continue; // silently skip malformed entries so a single bad line doesn't kill the invoice
+		}
+		lines.push({
+			id: crypto.randomUUID(),
+			title: p.title,
+			description: p.description ?? null,
+			quantity: p.quantity,
+			unit: p.unit ?? null,
+			unitPrice: Math.round(p.unitPrice * minor),
+			vatRate: typeof p.vatRate === 'number' ? p.vatRate : defaultVatRate,
+			discount: typeof p.discount === 'number' ? p.discount : null,
+		});
+	}
+
+	if (lines.length === 0) {
+		throw new Error('Keine gültige Position — erwarte { title, quantity, unitPrice } je Eintrag.');
+	}
+	return lines;
+}
+
+// ─── Tools ──────────────────────────────────────────────
+
+export const invoicesTools: ModuleTool[] = [
+	{
+		name: 'create_invoice',
+		module: 'invoices',
+		description:
+			'Erstellt eine neue Rechnung als Entwurf. Setzt Kunde (Name + optional Adresse + E-Mail), Positionen (Titel, Menge, Einzelpreis in Hauptwaehrung), Faelligkeit. Nummer wird automatisch vergeben.',
+		parameters: [
+			{
+				name: 'clientName',
+				type: 'string',
+				description: 'Name des Kunden (erforderlich)',
+				required: true,
+			},
+			{
+				name: 'clientEmail',
+				type: 'string',
+				description: 'E-Mail-Adresse des Kunden',
+				required: false,
+			},
+			{
+				name: 'clientAddress',
+				type: 'string',
+				description: 'Postanschrift des Kunden (mehrzeilig, Strasse + Nr, dann PLZ Ort)',
+				required: false,
+			},
+			{
+				name: 'subject',
+				type: 'string',
+				description: 'Kurzer Betreff (z.B. "Beratung April")',
+				required: false,
+			},
+			{
+				name: 'currency',
+				type: 'string',
+				description: 'Waehrung (Standard: CHF)',
+				required: false,
+				enum: ['CHF', 'EUR', 'USD'],
+			},
+			{
+				name: 'dueDate',
+				type: 'string',
+				description: 'Faelligkeitsdatum (YYYY-MM-DD). Ohne Angabe: +30 Tage ab heute.',
+				required: false,
+			},
+			{
+				name: 'lines',
+				type: 'array',
+				description:
+					'Array von Positionen: [{ title, quantity, unitPrice (Hauptwaehrung), vatRate?, unit? }]. Mindestens eine Position.',
+				required: true,
+			},
+		],
+		async execute(params) {
+			const clientName = String(params.clientName ?? '').trim();
+			if (!clientName) {
+				return { success: false, message: 'Kundenname fehlt.' };
+			}
+			const currency = (params.currency as Currency) ?? 'CHF';
+			const snapshot: InvoiceClientSnapshot = {
+				name: clientName,
+				address: (params.clientAddress as string | undefined)?.trim() || undefined,
+				email: (params.clientEmail as string | undefined)?.trim() || undefined,
+			};
+			try {
+				const lines = coerceLines(params.lines, currency, 8.1);
+				const id = await invoicesStore.createInvoice({
+					clientId: null,
+					clientSource: 'invoice-client',
+					clientSnapshot: snapshot,
+					currency,
+					dueDate: (params.dueDate as string | undefined) || undefined,
+					lines,
+					subject: (params.subject as string | undefined) || null,
+				});
+				// Re-read to get the generated number + total for the message.
+				const row = await invoiceTable.get(id);
+				const gross = row?.totals?.gross ?? 0;
+				return {
+					success: true,
+					data: { id, number: row?.number, gross, currency },
+					message: `Entwurf ${row?.number ?? '(neu)'} für ${clientName} über ${formatAmount(gross, currency)} angelegt.`,
+				};
+			} catch (e) {
+				return {
+					success: false,
+					message: e instanceof Error ? e.message : 'Erstellen fehlgeschlagen',
+				};
+			}
+		},
+	},
+
+	{
+		name: 'mark_invoice_paid',
+		module: 'invoices',
+		description:
+			'Markiert eine versendete oder ueberfaellige Rechnung als bezahlt. paidAt ist optional (Standard: heute, fuer rueckdatierte Eingaenge ein fruehes Datum setzen).',
+		parameters: [
+			{
+				name: 'invoiceId',
+				type: 'string',
+				description: 'ID der Rechnung (aus list_invoices)',
+				required: true,
+			},
+			{
+				name: 'paidAt',
+				type: 'string',
+				description: 'Zahlungsdatum (ISO oder YYYY-MM-DD). Standard: jetzt.',
+				required: false,
+			},
+		],
+		async execute(params) {
+			const id = String(params.invoiceId ?? '').trim();
+			if (!id) return { success: false, message: 'Rechnungs-ID fehlt.' };
+			const existing = await invoiceTable.get(id);
+			if (!existing) return { success: false, message: `Rechnung ${id} nicht gefunden.` };
+			// Normalise YYYY-MM-DD → ISO so markPaid's timestamp is consistent with
+			// the UI path (which uses new Date().toISOString()).
+			let paidAt = params.paidAt as string | undefined;
+			if (paidAt && /^\d{4}-\d{2}-\d{2}$/.test(paidAt)) {
+				paidAt = new Date(`${paidAt}T12:00:00.000Z`).toISOString();
+			}
+			await invoicesStore.markPaid(id, paidAt);
+			return {
+				success: true,
+				data: { id, number: existing.number },
+				message: `Rechnung ${existing.number} als bezahlt markiert.`,
+			};
+		},
+	},
+
+	{
+		name: 'list_invoices',
+		module: 'invoices',
+		description:
+			'Listet Rechnungen auf. Optional nach Status (draft/sent/paid/overdue/void) und Limit gefiltert. Gibt ID, Nummer, Kunde, Status, Betrag, Faelligkeit zurueck.',
+		parameters: [
+			{
+				name: 'status',
+				type: 'string',
+				description: 'Nur diesen Status zeigen',
+				required: false,
+				enum: ['draft', 'sent', 'paid', 'overdue', 'void'],
+			},
+			{
+				name: 'limit',
+				type: 'number',
+				description: 'Maximale Anzahl (Standard: 20)',
+				required: false,
+			},
+		],
+		async execute(params) {
+			const all = await listDecryptedInvoices();
+			const status = params.status as InvoiceStatus | undefined;
+			const filtered = status ? all.filter((i) => i.status === status) : all;
+			const limit = Number(params.limit ?? 20);
+			const slice = filtered.slice(0, Math.max(1, limit));
+			const data = slice.map((i) => ({
+				id: i.id,
+				number: i.number,
+				status: i.status,
+				client: i.clientSnapshot.name,
+				gross: i.totals.gross / CURRENCIES[i.currency].minorUnit,
+				currency: i.currency,
+				issueDate: i.issueDate,
+				dueDate: i.dueDate,
+			}));
+			return {
+				success: true,
+				data,
+				message: `${slice.length} Rechnung${slice.length === 1 ? '' : 'en'}${status ? ` im Status ${status}` : ''}.`,
+			};
+		},
+	},
+
+	{
+		name: 'get_invoice_stats',
+		module: 'invoices',
+		description:
+			'Gibt Rechnungs-Kennzahlen zurueck: offene Summe, ueberfaellige Summe, YTD fakturiert + bezahlt (pro Waehrung, in Hauptwaehrung als Gleitkomma).',
+		parameters: [],
+		async execute() {
+			const all = await listDecryptedInvoices();
+			const year = new Date().getFullYear();
+			const stats = computeStats(all, year);
+			// Convert minor-unit maps to major-unit maps so the LLM can reason
+			// with numbers that match the user's mental model.
+			const toMajor = (map: Record<Currency, number>): Record<Currency, number> => ({
+				CHF: map.CHF / 100,
+				EUR: map.EUR / 100,
+				USD: map.USD / 100,
+			});
+			return {
+				success: true,
+				data: {
+					counts: stats.totalByStatus,
+					openByCurrency: toMajor(stats.openByCurrency),
+					overdueByCurrency: toMajor(stats.overdueByCurrency),
+					invoicedYtdByCurrency: toMajor(stats.invoicedYtdByCurrency),
+					paidYtdByCurrency: toMajor(stats.paidYtdByCurrency),
+					year,
+				},
+				message: `${stats.totalByStatus.sent + stats.totalByStatus.overdue} offen, ${stats.totalByStatus.overdue} überfällig.`,
+			};
+		},
+	},
+];
diff --git a/packages/shared-ai/src/tools/function-schema.test.ts b/packages/shared-ai/src/tools/function-schema.test.ts
index 23c499a65..d3bad90ef 100644
--- a/packages/shared-ai/src/tools/function-schema.test.ts
+++ b/packages/shared-ai/src/tools/function-schema.test.ts
@@ -87,8 +87,10 @@ describe('toolToFunctionSchema', () => {
 			description: 'Broken',
 			defaultPolicy: 'auto',
 			parameters: [
+				// `fruit` is genuinely not a JSON Schema type — the catalog-typo
+				// guard exists to catch accidental one-off strings like this.
 				// eslint-disable-next-line @typescript-eslint/no-explicit-any
-				{ name: 'p', type: 'array' as any, description: 'p', required: true },
+				{ name: 'p', type: 'fruit' as any, description: 'p', required: true },
 			],
 		};
 		expect(() => toolToFunctionSchema(tool)).toThrow(/Unsupported parameter type/);
diff --git a/packages/shared-ai/src/tools/function-schema.ts b/packages/shared-ai/src/tools/function-schema.ts
index c672b3cde..2e7ed997f 100644
--- a/packages/shared-ai/src/tools/function-schema.ts
+++ b/packages/shared-ai/src/tools/function-schema.ts
@@ -16,9 +16,14 @@
 
 import type { ToolSchema } from './schemas';
 
-/** OpenAI-compatible JSON-Schema property type. */
+/** OpenAI-compatible JSON-Schema property type. `array` / `object` are
+ *  emitted without a nested `items` / `properties` schema — tools that
+ *  take structured payloads describe the expected shape inside their
+ *  human-readable description and parse in the executor. Tightening to
+ *  a full JSON-Schema tree would be strictly better but isn't required
+ *  by the OpenAI / Anthropic function-calling specs. */
 export interface JsonSchemaProperty {
-	type: 'string' | 'number' | 'integer' | 'boolean';
+	type: 'string' | 'number' | 'integer' | 'boolean' | 'array' | 'object';
 	description?: string;
 	enum?: readonly string[];
 }
@@ -53,6 +58,8 @@ function mapParamType(t: string): JsonSchemaProperty['type'] {
 		case 'number':
 		case 'integer':
 		case 'boolean':
+		case 'array':
+		case 'object':
 			return t;
 		default:
 			// Unknown types in the catalog are a bug, but don't silently
diff --git a/packages/shared-ai/src/tools/schemas.ts b/packages/shared-ai/src/tools/schemas.ts
index 7cd4f756d..530dd4888 100644
--- a/packages/shared-ai/src/tools/schemas.ts
+++ b/packages/shared-ai/src/tools/schemas.ts
@@ -1110,6 +1110,112 @@ export const AI_TOOL_CATALOG: readonly ToolSchema[] = [
 		defaultPolicy: 'auto',
 		parameters: [{ name: 'quizId', type: 'string', description: 'ID des Quiz', required: true }],
 	},
+
+	// ── Invoices ─────────────────────────────────────────────
+	{
+		name: 'create_invoice',
+		module: 'invoices',
+		description:
+			'Erstellt eine neue Rechnung als Entwurf. Setzt Kunde (Name + optional Adresse + E-Mail), Positionen (Titel, Menge, Einzelpreis in Hauptwaehrung), Faelligkeit. Nummer wird automatisch vergeben.',
+		defaultPolicy: 'propose',
+		parameters: [
+			{
+				name: 'clientName',
+				type: 'string',
+				description: 'Name des Kunden (erforderlich)',
+				required: true,
+			},
+			{
+				name: 'clientEmail',
+				type: 'string',
+				description: 'E-Mail-Adresse des Kunden',
+				required: false,
+			},
+			{
+				name: 'clientAddress',
+				type: 'string',
+				description: 'Postanschrift des Kunden (mehrzeilig, Strasse + Nr, dann PLZ Ort)',
+				required: false,
+			},
+			{
+				name: 'subject',
+				type: 'string',
+				description: 'Kurzer Betreff (z.B. "Beratung April")',
+				required: false,
+			},
+			{
+				name: 'currency',
+				type: 'string',
+				description: 'Waehrung (Standard: CHF)',
+				required: false,
+				enum: ['CHF', 'EUR', 'USD'],
+			},
+			{
+				name: 'dueDate',
+				type: 'string',
+				description: 'Faelligkeitsdatum (YYYY-MM-DD). Ohne Angabe: +30 Tage ab heute.',
+				required: false,
+			},
+			{
+				name: 'lines',
+				type: 'array',
+				description:
+					'Array von Positionen: [{ title: string, quantity: number, unitPrice: number (in Hauptwaehrung, z.B. 150.00), vatRate?: number, unit?: string }]. Mindestens eine Position.',
+				required: true,
+			},
+		],
+	},
+	{
+		name: 'mark_invoice_paid',
+		module: 'invoices',
+		description:
+			'Markiert eine versendete oder ueberfaellige Rechnung als bezahlt. paidAt ist optional (Standard: heute, fuer rueckdatierte Eingaenge ein fruehes Datum setzen).',
+		defaultPolicy: 'propose',
+		parameters: [
+			{
+				name: 'invoiceId',
+				type: 'string',
+				description: 'ID der Rechnung (aus list_invoices)',
+				required: true,
+			},
+			{
+				name: 'paidAt',
+				type: 'string',
+				description: 'Zahlungsdatum (ISO oder YYYY-MM-DD). Standard: jetzt.',
+				required: false,
+			},
+		],
+	},
+	{
+		name: 'list_invoices',
+		module: 'invoices',
+		description:
+			'Listet Rechnungen auf. Optional nach Status (draft/sent/paid/overdue/void) und Limit gefiltert. Gibt ID, Nummer, Kunde, Status, Betrag, Faelligkeit zurueck.',
+		defaultPolicy: 'auto',
+		parameters: [
+			{
+				name: 'status',
+				type: 'string',
+				description: 'Nur diesen Status zeigen',
+				required: false,
+				enum: ['draft', 'sent', 'paid', 'overdue', 'void'],
+			},
+			{
+				name: 'limit',
+				type: 'number',
+				description: 'Maximale Anzahl (Standard: 20)',
+				required: false,
+			},
+		],
+	},
+	{
+		name: 'get_invoice_stats',
+		module: 'invoices',
+		description:
+			'Gibt Rechnungs-Kennzahlen zurueck: offene Summe, ueberfaellige Summe, YTD fakturiert + bezahlt (pro Waehrung, in Hauptwaehrung als Gleitkomma).',
+		defaultPolicy: 'auto',
+		parameters: [],
+	},
 ];
 
 // ═══════════════════════════════════════════════════════════════