feat(mcp): paginate record lists and describe document inputs

backend/src/mcp/documentSchemas.ts

@@ -0,0 +1,62 @@
+const nullableText = { type: ["string", "null"] }
+
+export const outgoingAddressSchema = {
+    type: "object",
+    description: "Abweichende Empfängeradresse; Feldnamen entsprechen dem Belegeditor.",
+    properties: { street: nullableText, special: nullableText, zip: nullableText, city: nullableText },
+    additionalProperties: true,
+}
+
+export const outgoingRowsSchema = {
+    type: "array",
+    description: "Belegpositionen als Objekte. Beträge numerisch in EUR, unit als Einheiten-ID. Mengen und Preise dürfen für Korrekturpositionen negativ sein.",
+    items: {
+        type: "object",
+        properties: {
+            id: { type: "string", format: "uuid", description: "Optionale Positions-ID; wird sonst erzeugt." },
+            pos: { type: "string", description: "Positionsnummer, z. B. 1.1; wird sonst erzeugt." },
+            mode: { type: "string", enum: ["free", "normal", "service", "title", "text", "pagebreak"], default: "free" },
+            text: { type: "string" },
+            descriptionText: { type: "string" },
+            product: { type: "integer", minimum: 1, description: "Artikel-ID bei mode=normal." },
+            service: { type: "integer", minimum: 1, description: "Leistungs-ID bei mode=service." },
+            quantity: { type: "number", default: 1 },
+            unit: { type: "integer", minimum: 1 },
+            price: { type: "number", description: "Netto-Einzelpreis vor Positionsrabatt." },
+            inputPrice: { type: "number", description: "Eingegebener Einzelpreis; wird ohne price auch als price verwendet." },
+            purchasePrice: { type: "number" },
+            taxPercent: { type: "number", minimum: 0, maximum: 100 },
+            discountPercent: { type: "number", minimum: 0, maximum: 100, default: 0 },
+            costCentre: { type: ["string", "null"], format: "uuid", description: "Positionskostenstelle (abweichende Schreibweise zum Belegfeld costcentre)." },
+            optional: { type: "boolean" },
+            alternative: { type: "boolean" },
+            titleLevel: { type: "integer", minimum: 1, maximum: 3 },
+            linkedEntitys: {
+                type: "array",
+                items: { type: "object", properties: { type: { type: "string" }, subtype: { type: "string" }, id: { type: "integer", minimum: 1 } } },
+            },
+        },
+        // Preserve module-specific position fields used by existing callers.
+        additionalProperties: true,
+    },
+}
+
+export const outgoingReportSchema = {
+    type: "object",
+    description: "Optionale, vom Aufrufer berechnete Kalkulationswerte. Diese Felder werden gespeichert, nicht durch MCP berechnet.",
+    properties: {
+        totalProductsPurchasePrice: { type: "number" },
+        totalProductsFromServicesPurchasePrice: { type: "number" },
+        totalMargin: { type: "number" },
+        totalHoursSellingPrice: { type: "number" },
+        totalHoursFromServices: {
+            type: "object",
+            properties: {
+                total: { type: "number" },
+                totalPurchasePrice: { type: "number" },
+                byName: { type: "object", additionalProperties: { type: "number" } },
+            },
+        },
+    },
+    additionalProperties: true,
+}

backend/src/mcp/pagination.ts

@@ -0,0 +1,31 @@
+/** Offset pagination for a stable dataset; fetch one extra row to detect the next page. */
+export const paginationProperties = {
+    limit: { type: "integer", minimum: 1, maximum: 100, default: 25 },
+    offset: { type: "integer", minimum: 0, default: 0, description: "Startposition. Für Folgeseiten pagination.nextOffset mit denselben Filtern verwenden." },
+}
+
+export function limitFromArgs(args: Record<string, unknown>, fallback = 25) {
+    const value = args.limit ?? fallback
+    if (typeof value !== "number" || !Number.isSafeInteger(value) || value < 1 || value > 100) {
+        throw new Error("limit muss eine ganze Zahl zwischen 1 und 100 sein")
+    }
+    return value
+}
+
+export function offsetFromArgs(args: Record<string, unknown>) {
+    const value = args.offset ?? 0
+    if (typeof value !== "number" || !Number.isSafeInteger(value) || value < 0) {
+        throw new Error("offset muss eine nicht negative ganze Zahl sein")
+    }
+    return value
+}
+
+export function paginatedResult<T>(rows: T[], args: Record<string, unknown>, fallback = 25) {
+    const limit = limitFromArgs(args, fallback)
+    const offset = offsetFromArgs(args)
+    const hasMore = rows.length > limit
+    return {
+        rows: rows.slice(0, limit),
+        pagination: { limit, offset, hasMore, nextOffset: hasMore ? offset + limit : null },
+    }
+}

backend/src/mcp/tools/accounting.ts

@@ -1,3 +1,5 @@
+import { outgoingAddressSchema, outgoingRowsSchema, outgoingReportSchema } from "../documentSchemas"
+import { limitFromArgs, offsetFromArgs, paginatedResult, paginationProperties } from "../pagination"
 import { and, desc, eq, ilike, or } from "drizzle-orm"
 import { randomUUID } from "node:crypto"
 import {
@@ -27,11 +29,6 @@ import { McpTool } from "../types"
 
 export { prepareStatementAllocationInput } from "../statementAllocations"
 
-const limitFromArgs = (args: Record<string, unknown>, fallback = 25) => {
-    const raw = Number(args.limit ?? fallback)
-    if (!Number.isFinite(raw)) return fallback
-    return Math.min(Math.max(Math.trunc(raw), 1), 100)
-}
 
 const stringArg = (args: Record<string, unknown>, key: string) => {
     const value = args[key]
@@ -456,7 +453,7 @@ export const accountingTools: McpTool[] = [
                 state: { type: "string", description: "Optionaler Statusfilter, z. B. Entwurf oder Gebucht." },
                 customer: { type: "number" },
                 project: { type: "number" },
-                limit: { type: "number", minimum: 1, maximum: 100 },
+                ...paginationProperties,
             },
         },
         async handler(context, args) {
@@ -479,10 +476,11 @@ export const accountingTools: McpTool[] = [
                 .select()
                 .from(createddocuments)
                 .where(and(...conditions))
-                .orderBy(desc(createddocuments.createdAt))
-                .limit(limitFromArgs(args))
+                .orderBy(desc(createddocuments.createdAt), createddocuments.id)
+                .limit(limitFromArgs(args) + 1)
+                .offset(offsetFromArgs(args))
 
-            return { rows }
+            return paginatedResult(rows, args)
         },
     },
     {
@@ -542,12 +540,12 @@ export const accountingTools: McpTool[] = [
                 description: { type: "string" },
                 startText: { type: "string" },
                 endText: { type: "string" },
-                address: { type: "object" },
-                rows: { type: "array" },
+                address: outgoingAddressSchema,
+                rows: outgoingRowsSchema,
                 letterhead: { type: "number" },
                 availableInPortal: { type: "boolean" },
                 customSurchargePercentage: { type: "number" },
-                report: { type: "object" },
+                report: outgoingReportSchema,
                 serialConfig: serialConfigSchema,
             },
         },
@@ -598,12 +596,12 @@ export const accountingTools: McpTool[] = [
                 description: { type: "string" },
                 startText: { type: "string" },
                 endText: { type: "string" },
-                address: { type: "object" },
-                rows: { type: "array" },
+                address: outgoingAddressSchema,
+                rows: outgoingRowsSchema,
                 letterhead: { type: "number" },
                 availableInPortal: { type: "boolean" },
                 customSurchargePercentage: { type: "number" },
-                report: { type: "object" },
+                report: outgoingReportSchema,
                 serialConfig: serialConfigSchema,
             },
         },
@@ -720,8 +718,8 @@ export const accountingTools: McpTool[] = [
                     enum: ["Standard", "13b UStG", "19 UStG", "12.3 UStG"],
                     description: "Steuertyp des gesamten Ausgangsdokuments, nicht der einzelne USt-Satz einer Position.",
                 },
-                rows: { type: "array" },
-                report: { type: "object" },
+                rows: outgoingRowsSchema,
+                report: outgoingReportSchema,
                 availableInPortal: { type: "boolean" },
             },
         },
@@ -803,7 +801,7 @@ export const accountingTools: McpTool[] = [
             type: "object",
             properties: {
                 status: { type: "string", enum: ["draft", "completed", "error"] },
-                limit: { type: "number", minimum: 1, maximum: 100 },
+                ...paginationProperties,
             },
         },
         async handler(context, args) {
@@ -815,10 +813,11 @@ export const accountingTools: McpTool[] = [
                 .select()
                 .from(serialExecutions)
                 .where(and(...conditions))
-                .orderBy(desc(serialExecutions.createdAt))
-                .limit(limitFromArgs(args))
+                .orderBy(desc(serialExecutions.createdAt), serialExecutions.id)
+                .limit(limitFromArgs(args) + 1)
+                .offset(offsetFromArgs(args))
 
-            return { rows }
+            return paginatedResult(rows, args)
         },
     },
     {
@@ -878,7 +877,7 @@ export const accountingTools: McpTool[] = [
             type: "object",
             properties: {
                 query: { type: "string", description: "Suchtext für Kontonummer, Bezeichnung oder Beschreibung." },
-                limit: { type: "number", minimum: 1, maximum: 100 },
+                ...paginationProperties,
             },
         },
         async handler(context, args) {
@@ -908,10 +907,11 @@ export const accountingTools: McpTool[] = [
                 .select()
                 .from(accounts)
                 .where(whereCond)
-                .orderBy(accounts.number)
-                .limit(limit)
+                .orderBy(accounts.number, accounts.id)
+                .limit(limit + 1)
+                .offset(offsetFromArgs(args))
 
-            return { accountChart, rows }
+            return { accountChart, ...paginatedResult(rows, args) }
         },
     },
     {
@@ -924,7 +924,7 @@ export const accountingTools: McpTool[] = [
             properties: {
                 state: { type: "string", description: "Optionaler Statusfilter." },
                 paid: { type: "boolean", description: "Optionaler Zahlungsstatus." },
-                limit: { type: "number", minimum: 1, maximum: 100 },
+                ...paginationProperties,
             },
         },
         async handler(context, args) {
@@ -939,10 +939,11 @@ export const accountingTools: McpTool[] = [
                 .select()
                 .from(incominginvoices)
                 .where(and(...conditions))
-                .orderBy(desc(incominginvoices.createdAt))
-                .limit(limitFromArgs(args))
+                .orderBy(desc(incominginvoices.createdAt), incominginvoices.id)
+                .limit(limitFromArgs(args) + 1)
+                .offset(offsetFromArgs(args))
 
-            return { rows }
+            return paginatedResult(rows, args)
         },
     },
     {
@@ -981,6 +982,7 @@ export const accountingTools: McpTool[] = [
             required: ["id"],
             properties: {
                 id: { type: "number" },
+                ...paginationProperties,
             },
         },
         async handler(context, args) {
@@ -995,9 +997,11 @@ export const accountingTools: McpTool[] = [
                     eq(files.tenant, context.tenantId),
                     eq(files.archived, false)
                 ))
-                .orderBy(desc(files.createdAt))
+                .orderBy(desc(files.createdAt), files.id)
+                .limit(limitFromArgs(args) + 1)
+                .offset(offsetFromArgs(args))
 
-            return { rows }
+            return paginatedResult(rows, args)
         },
     },
     {
@@ -1311,7 +1315,7 @@ export const accountingTools: McpTool[] = [
             type: "object",
             properties: {
                 account: { type: "number", description: "Optionale Bankkonto-ID." },
-                limit: { type: "number", minimum: 1, maximum: 100 },
+                ...paginationProperties,
             },
         },
         async handler(context, args) {
@@ -1326,9 +1330,10 @@ export const accountingTools: McpTool[] = [
                 .from(bankstatements)
                 .where(and(...conditions))
                 .orderBy(desc(bankstatements.date), desc(bankstatements.id))
-                .limit(limitFromArgs(args))
+                .limit(limitFromArgs(args) + 1)
+                .offset(offsetFromArgs(args))
 
-            return { rows }
+            return paginatedResult(rows, args)
         },
     },
     {
@@ -1367,7 +1372,7 @@ export const accountingTools: McpTool[] = [
             properties: {
                 bankstatement: { type: "number" },
                 incominginvoice: { type: "number" },
-                limit: { type: "number", minimum: 1, maximum: 100 },
+                ...paginationProperties,
             },
         },
         async handler(context, args) {
@@ -1383,10 +1388,11 @@ export const accountingTools: McpTool[] = [
                 .select()
                 .from(statementallocations)
                 .where(and(...conditions))
-                .orderBy(desc(statementallocations.created_at))
-                .limit(limitFromArgs(args))
+                .orderBy(desc(statementallocations.created_at), statementallocations.id)
+                .limit(limitFromArgs(args) + 1)
+                .offset(offsetFromArgs(args))
 
-            return { rows }
+            return paginatedResult(rows, args)
         },
     },
     {

backend/src/mcp/tools/masterdata.ts

@@ -1,3 +1,4 @@
+import { limitFromArgs, offsetFromArgs, paginatedResult, paginationProperties } from "../pagination"
 import { and, desc, eq, ilike, or } from "drizzle-orm"
 import {
     branches,
@@ -14,11 +15,6 @@ import {
 } from "../../../db/schema"
 import { McpTool } from "../types"
 
-const limitFromArgs = (args: Record<string, unknown>, fallback = 25) => {
-    const raw = Number(args.limit ?? fallback)
-    if (!Number.isFinite(raw)) return fallback
-    return Math.min(Math.max(Math.trunc(raw), 1), 100)
-}
 
 const stringArg = (args: Record<string, unknown>, key: string) => {
     const value = args[key]
@@ -71,7 +67,7 @@ export const masterdataTools: McpTool[] = [
             type: "object",
             properties: {
                 query: { type: "string", description: "Suchtext für Name, Lieferantennummer oder Notizen." },
-                limit: { type: "number", minimum: 1, maximum: 100 },
+                ...paginationProperties,
             },
         },
         async handler(context, args) {
@@ -91,10 +87,11 @@ export const masterdataTools: McpTool[] = [
                 .select()
                 .from(vendors)
                 .where(and(...conditions))
-                .orderBy(vendors.name)
-                .limit(limitFromArgs(args))
+                .orderBy(vendors.name, vendors.id)
+                .limit(limitFromArgs(args) + 1)
+                .offset(offsetFromArgs(args))
 
-            return { rows }
+            return paginatedResult(rows, args)
         },
     },
     {
@@ -132,7 +129,7 @@ export const masterdataTools: McpTool[] = [
                 query: { type: "string", description: "Suchtext für Name, E-Mail, Telefon, Rolle oder Notizen." },
                 customer: { type: "number" },
                 vendor: { type: "number" },
-                limit: { type: "number", minimum: 1, maximum: 100 },
+                ...paginationProperties,
             },
         },
         async handler(context, args) {
@@ -161,10 +158,11 @@ export const masterdataTools: McpTool[] = [
                 .select()
                 .from(contacts)
                 .where(and(...conditions))
-                .orderBy(contacts.fullName)
-                .limit(limitFromArgs(args))
+                .orderBy(contacts.fullName, contacts.id)
+                .limit(limitFromArgs(args) + 1)
+                .offset(offsetFromArgs(args))
 
-            return { rows }
+            return paginatedResult(rows, args)
         },
     },
     {
@@ -176,7 +174,7 @@ export const masterdataTools: McpTool[] = [
             type: "object",
             properties: {
                 query: { type: "string", description: "Suchtext für Name, Artikelnummer, Hersteller, EAN, Barcode oder Beschreibung." },
-                limit: { type: "number", minimum: 1, maximum: 100 },
+                ...paginationProperties,
             },
         },
         async handler(context, args) {
@@ -200,10 +198,11 @@ export const masterdataTools: McpTool[] = [
                 .select()
                 .from(products)
                 .where(and(...conditions))
-                .orderBy(products.name)
-                .limit(limitFromArgs(args))
+                .orderBy(products.name, products.id)
+                .limit(limitFromArgs(args) + 1)
+                .offset(offsetFromArgs(args))
 
-            return { rows }
+            return paginatedResult(rows, args)
         },
     },
     {
@@ -239,7 +238,7 @@ export const masterdataTools: McpTool[] = [
             type: "object",
             properties: {
                 query: { type: "string", description: "Suchtext für Name, Leistungsnummer oder Beschreibung." },
-                limit: { type: "number", minimum: 1, maximum: 100 },
+                ...paginationProperties,
             },
         },
         async handler(context, args) {
@@ -258,10 +257,11 @@ export const masterdataTools: McpTool[] = [
                 .select()
                 .from(services)
                 .where(and(...conditions))
-                .orderBy(services.name)
-                .limit(limitFromArgs(args))
+                .orderBy(services.name, services.id)
+                .limit(limitFromArgs(args) + 1)
+                .offset(offsetFromArgs(args))
 
-            return { rows }
+            return paginatedResult(rows, args)
         },
     },
     {
@@ -299,7 +299,7 @@ export const masterdataTools: McpTool[] = [
                 query: { type: "string", description: "Suchtext für Nummer, Name oder Beschreibung." },
                 branch: { type: "number" },
                 project: { type: "number" },
-                limit: { type: "number", minimum: 1, maximum: 100 },
+                ...paginationProperties,
             },
         },
         async handler(context, args) {
@@ -323,10 +323,11 @@ export const masterdataTools: McpTool[] = [
                 .select()
                 .from(costcentres)
                 .where(and(...conditions))
-                .orderBy(costcentres.number)
-                .limit(limitFromArgs(args))
+                .orderBy(costcentres.number, costcentres.id)
+                .limit(limitFromArgs(args) + 1)
+                .offset(offsetFromArgs(args))
 
-            return { rows }
+            return paginatedResult(rows, args)
         },
     },
     {
@@ -362,7 +363,7 @@ export const masterdataTools: McpTool[] = [
             type: "object",
             properties: {
                 query: { type: "string", description: "Suchtext für Nummer, Name oder Beschreibung." },
-                limit: { type: "number", minimum: 1, maximum: 100 },
+                ...paginationProperties,
             },
         },
         async handler(context, args) {
@@ -382,10 +383,11 @@ export const masterdataTools: McpTool[] = [
                 .select()
                 .from(branches)
                 .where(and(...conditions))
-                .orderBy(branches.name)
-                .limit(limitFromArgs(args))
+                .orderBy(branches.name, branches.id)
+                .limit(limitFromArgs(args) + 1)
+                .offset(offsetFromArgs(args))
 
-            return { rows }
+            return paginatedResult(rows, args)
         },
     },
     {
@@ -398,7 +400,7 @@ export const masterdataTools: McpTool[] = [
             properties: {
                 query: { type: "string", description: "Suchtext für Name oder Beschreibung." },
                 branch: { type: "number" },
-                limit: { type: "number", minimum: 1, maximum: 100 },
+                ...paginationProperties,
             },
         },
         async handler(context, args) {
@@ -419,10 +421,11 @@ export const masterdataTools: McpTool[] = [
                 .select()
                 .from(teams)
                 .where(and(...conditions))
-                .orderBy(teams.name)
-                .limit(limitFromArgs(args))
+                .orderBy(teams.name, teams.id)
+                .limit(limitFromArgs(args) + 1)
+                .offset(offsetFromArgs(args))
 
-            return { rows }
+            return paginatedResult(rows, args)
         },
     },
     {
@@ -434,7 +437,7 @@ export const masterdataTools: McpTool[] = [
             type: "object",
             properties: {
                 query: { type: "string", description: "Suchtext für Name, Kennzeichen, FIN oder Farbe." },
-                limit: { type: "number", minimum: 1, maximum: 100 },
+                ...paginationProperties,
             },
         },
         async handler(context, args) {
@@ -455,10 +458,11 @@ export const masterdataTools: McpTool[] = [
                 .select()
                 .from(vehicles)
                 .where(and(...conditions))
-                .orderBy(vehicles.name)
-                .limit(limitFromArgs(args))
+                .orderBy(vehicles.name, vehicles.id)
+                .limit(limitFromArgs(args) + 1)
+                .offset(offsetFromArgs(args))
 
-            return { rows }
+            return paginatedResult(rows, args)
         },
     },
     {
@@ -471,7 +475,7 @@ export const masterdataTools: McpTool[] = [
             properties: {
                 query: { type: "string", description: "Suchtext für Name, Artikelnummer, Seriennummer, Hersteller oder Beschreibung." },
                 vendor: { type: "number" },
-                limit: { type: "number", minimum: 1, maximum: 100 },
+                ...paginationProperties,
             },
         },
         async handler(context, args) {
@@ -496,10 +500,11 @@ export const masterdataTools: McpTool[] = [
                 .select()
                 .from(inventoryitems)
                 .where(and(...conditions))
-                .orderBy(inventoryitems.name)
-                .limit(limitFromArgs(args))
+                .orderBy(inventoryitems.name, inventoryitems.id)
+                .limit(limitFromArgs(args) + 1)
+                .offset(offsetFromArgs(args))
 
-            return { rows }
+            return paginatedResult(rows, args)
         },
     },
     {
@@ -535,7 +540,7 @@ export const masterdataTools: McpTool[] = [
             type: "object",
             properties: {
                 query: { type: "string", description: "Suchtext für Name, Singular, Plural oder Kürzel." },
-                limit: { type: "number", minimum: 1, maximum: 100 },
+                ...paginationProperties,
             },
         },
         async handler(context, args) {
@@ -552,10 +557,11 @@ export const masterdataTools: McpTool[] = [
                         ilike(units.short, `%${query}%`)
                     )
                     : undefined)
-                .orderBy(units.name)
-                .limit(limitFromArgs(args))
+                .orderBy(units.name, units.id)
+                .limit(limitFromArgs(args) + 1)
+                .offset(offsetFromArgs(args))
 
-            return { rows }
+            return paginatedResult(rows, args)
         },
     },
 ]

backend/src/mcp/tools/organisation.ts

@@ -1,14 +1,10 @@
+import { limitFromArgs, offsetFromArgs, paginatedResult, paginationProperties } from "../pagination"
 import { and, desc, eq, ilike, or } from "drizzle-orm"
 import { customers, events, plants, projects, tasks } from "../../../db/schema"
 import { insertHistoryItem } from "../../utils/history"
 import { activateProjectPhase } from "../projectPhases"
 import { McpTool } from "../types"
 
-const limitFromArgs = (args: Record<string, unknown>, fallback = 25) => {
-    const raw = Number(args.limit ?? fallback)
-    if (!Number.isFinite(raw)) return fallback
-    return Math.min(Math.max(Math.trunc(raw), 1), 100)
-}
 
 const stringArg = (args: Record<string, unknown>, key: string) => {
     const value = args[key]
@@ -30,7 +26,7 @@ export const organisationTools: McpTool[] = [
             type: "object",
             properties: {
                 query: { type: "string", description: "Suchtext für Name, Kundennummer, Vorname, Nachname oder Notizen." },
-                limit: { type: "number", minimum: 1, maximum: 100 },
+                ...paginationProperties,
             },
         },
         async handler(context, args) {
@@ -62,10 +58,11 @@ export const organisationTools: McpTool[] = [
                 })
                 .from(customers)
                 .where(and(...conditions))
-                .orderBy(customers.name)
-                .limit(limitFromArgs(args))
+                .orderBy(customers.name, customers.id)
+                .limit(limitFromArgs(args) + 1)
+                .offset(offsetFromArgs(args))
 
-            return { rows }
+            return paginatedResult(rows, args)
         },
     },
     {
@@ -79,7 +76,7 @@ export const organisationTools: McpTool[] = [
                 query: { type: "string", description: "Suchtext für Name, Projektnummer, Kundenreferenz oder Notizen." },
                 customer: { type: "number" },
                 activePhase: { type: "string" },
-                limit: { type: "number", minimum: 1, maximum: 100 },
+                ...paginationProperties,
             },
         },
         async handler(context, args) {
@@ -104,10 +101,11 @@ export const organisationTools: McpTool[] = [
                 .select()
                 .from(projects)
                 .where(and(...conditions))
-                .orderBy(desc(projects.createdAt))
-                .limit(limitFromArgs(args))
+                .orderBy(desc(projects.createdAt), projects.id)
+                .limit(limitFromArgs(args) + 1)
+                .offset(offsetFromArgs(args))
 
-            return { rows }
+            return paginatedResult(rows, args)
         },
     },
     {
@@ -217,7 +215,7 @@ export const organisationTools: McpTool[] = [
             properties: {
                 query: { type: "string", description: "Suchtext für Name." },
                 customer: { type: "number" },
-                limit: { type: "number", minimum: 1, maximum: 100 },
+                ...paginationProperties,
             },
         },
         async handler(context, args) {
@@ -233,10 +231,11 @@ export const organisationTools: McpTool[] = [
                 .select()
                 .from(plants)
                 .where(and(...conditions))
-                .orderBy(plants.name)
-                .limit(limitFromArgs(args))
+                .orderBy(plants.name, plants.id)
+                .limit(limitFromArgs(args) + 1)
+                .offset(offsetFromArgs(args))
 
-            return { rows }
+            return paginatedResult(rows, args)
         },
     },
     {
@@ -251,7 +250,7 @@ export const organisationTools: McpTool[] = [
                 project: { type: "number" },
                 customer: { type: "number" },
                 eventtype: { type: "string" },
-                limit: { type: "number", minimum: 1, maximum: 100 },
+                ...paginationProperties,
             },
         },
         async handler(context, args) {
@@ -277,10 +276,11 @@ export const organisationTools: McpTool[] = [
                 .select()
                 .from(events)
                 .where(and(...conditions))
-                .orderBy(desc(events.startDate))
-                .limit(limitFromArgs(args))
+                .orderBy(desc(events.startDate), events.id)
+                .limit(limitFromArgs(args) + 1)
+                .offset(offsetFromArgs(args))
 
-            return { rows }
+            return paginatedResult(rows, args)
         },
     },
     {
@@ -294,7 +294,7 @@ export const organisationTools: McpTool[] = [
                 query: { type: "string", description: "Suchtext für Name, Beschreibung oder Kategorie." },
                 project: { type: "number" },
                 customer: { type: "number" },
-                limit: { type: "number", minimum: 1, maximum: 100 },
+                ...paginationProperties,
             },
         },
         async handler(context, args) {
@@ -318,10 +318,11 @@ export const organisationTools: McpTool[] = [
                 .select()
                 .from(tasks)
                 .where(and(...conditions))
-                .orderBy(desc(tasks.createdAt))
-                .limit(limitFromArgs(args))
+                .orderBy(desc(tasks.createdAt), tasks.id)
+                .limit(limitFromArgs(args) + 1)
+                .offset(offsetFromArgs(args))
 
-            return { rows }
+            return paginatedResult(rows, args)
         },
     },
     {

backend/src/mcp/tools/wiki.ts

@@ -1,3 +1,4 @@
+import { limitFromArgs, offsetFromArgs, paginatedResult, paginationProperties } from "../pagination"
 import { and, asc, eq, ilike, isNull } from "drizzle-orm"
 import { wikiPages } from "../../../db/schema"
 import { McpContext, McpTool } from "../types"
@@ -27,17 +28,7 @@ const pageIdArg = (args: Record<string, unknown>, key = "id") => {
     return value
 }
 
-const limitFromArgs = (args: Record<string, unknown>) => {
-    const value = Number(args.limit ?? 50)
-    if (!Number.isFinite(value)) return 50
-    return Math.min(Math.max(Math.trunc(value), 1), 100)
-}
 
-const offsetFromArgs = (args: Record<string, unknown>) => {
-    const value = Number(args.offset ?? 0)
-    if (!Number.isFinite(value)) return 0
-    return Math.max(Math.trunc(value), 0)
-}
 
 export function prepareWikiScope(args: Record<string, unknown>): WikiScope {
     const entityType = stringArg(args, "entityType")
@@ -144,8 +135,8 @@ export const wikiTools: McpTool[] = [
                 ...entityScopeProperties,
                 query: { type: "string", description: "Optionaler Suchtext im Titel." },
                 parentId: { type: ["string", "null"], format: "uuid", description: "Optional auf direkte Kinder dieses Ordners einschränken; null steht für die oberste Ebene." },
-                limit: { type: "integer", minimum: 1, maximum: 100, default: 50 },
-                offset: { type: "integer", minimum: 0, default: 0 },
+                ...paginationProperties,
+                limit: { ...paginationProperties.limit, default: 50 },
             },
         },
         async handler(context, args) {
@@ -173,11 +164,11 @@ export const wikiTools: McpTool[] = [
                 })
                 .from(wikiPages)
                 .where(and(...conditions))
-                .orderBy(asc(wikiPages.sortOrder), asc(wikiPages.title))
-                .limit(limitFromArgs(args))
+                .orderBy(asc(wikiPages.sortOrder), asc(wikiPages.title), wikiPages.id)
+                .limit(limitFromArgs(args, 50) + 1)
                 .offset(offsetFromArgs(args))
 
-            return { rows }
+            return paginatedResult(rows, args, 50)
         },
     },
     {

backend/tests/mcpPagination.test.ts

@@ -0,0 +1,63 @@
+import assert from "node:assert/strict"
+import test from "node:test"
+import { getTableName } from "drizzle-orm"
+import { drizzle } from "drizzle-orm/pg-proxy"
+import * as schema from "../db/schema"
+import { mcpTools } from "../src/mcp/registry"
+import { limitFromArgs, offsetFromArgs, paginatedResult } from "../src/mcp/pagination"
+
+const tables = Object.values(schema).filter((value: any) => {
+    try { return typeof getTableName(value) === "string" } catch { return false }
+})
+
+for (const tool of mcpTools.filter((tool) => (tool.inputSchema.properties as any)?.offset)) {
+    test(`${tool.name}: retrieves 205 records across stable, bounded pages`, async () => {
+        const db = drizzle(async (sql, params) => {
+            if (sql.includes('from "tenants"')) return { rows: [["skr03"]] }
+            const tableName = sql.match(/from "(\w+)"/)?.[1]
+            const table = tables.find((table: any) => getTableName(table) === tableName) as any
+            assert.ok(table, sql)
+            assert.match(sql, /order by .*"id"/)
+            if (table.tenant || table.tenantId) {
+                assert.match(sql, /where .*"tenant(?:_id)?" = \$\d+/)
+                assert.ok(params.includes(7), "active tenant must be bound")
+            }
+            if (table.archived) assert.match(sql, /"archived" = \$\d+/)
+            const limitParam = sql.match(/limit \$(\d+)/)
+            const offsetParam = sql.match(/offset \$(\d+)/)
+            assert.ok(limitParam, "query must be bounded")
+            const limit = Number(params[Number(limitParam[1]) - 1])
+            const offset = offsetParam ? Number(params[Number(offsetParam[1]) - 1]) : 0
+            assert.equal(limit, 101, "fetch one extra row for hasMore")
+            const selected = sql.slice(7, sql.indexOf(" from ")).split(", ")
+            const idIndex = selected.findIndex((column) => /"id"$/.test(column))
+            assert.ok(idIndex >= 0)
+            return { rows: Array.from({ length: Math.min(limit, Math.max(0, 205 - offset)) }, (_, i) => {
+                const values = selected.map(() => null as unknown)
+                values[idIndex] = offset + i + 1
+                return values
+            }) }
+        }, { schema })
+        const context = { server: { db }, tenantId: 7, userId: "test" } as any
+        const ids: unknown[] = []
+        let offset = 0
+        for (let page = 0; page < 3; page++) {
+            const result: any = await tool.handler(context, { id: 1, limit: 100, offset })
+            assert.equal(result.rows.length, page < 2 ? 100 : 5)
+            assert.equal(result.pagination.hasMore, page < 2)
+            assert.equal(result.pagination.nextOffset, page < 2 ? offset + 100 : null)
+            ids.push(...result.rows.map((row: any) => Number(row.id)))
+            offset = result.pagination.nextOffset
+        }
+        assert.deepEqual(ids, Array.from({ length: 205 }, (_, i) => i + 1))
+    })
+}
+
+test("pagination validates input and handles empty and exactly full final pages", () => {
+    for (const limit of [-1, 0, 101, 1.5, "10", Infinity]) assert.throws(() => limitFromArgs({ limit }))
+    for (const offset of [-1, 1.5, "10", Infinity]) assert.throws(() => offsetFromArgs({ offset }))
+    assert.equal(limitFromArgs({}), 25)
+    assert.equal(limitFromArgs({}, 50), 50)
+    assert.equal(paginatedResult([1, 2], { limit: 2 }).pagination.nextOffset, null)
+    assert.deepEqual(paginatedResult([], { offset: 300 }).pagination, { limit: 25, offset: 300, hasMore: false, nextOffset: null })
+})

docs/technik/mcp.md

@@ -0,0 +1,19 @@
+# FEDEO MCP
+
+## Listen und Pagination
+
+Alle datensatzbasierten MCP-Listen und Suchwerkzeuge unterstützen `limit` (ganze Zahl 1–100, Standard 25) und `offset` (ganze Zahl ab 0). Das Wiki behält Standard 50. Die statische Liste der Beleg-Steuertypen benötigt keine Pagination.
+
+Die Antwort behält `rows` und ergänzt:
+
+```json
+{"pagination":{"limit":25,"offset":0,"hasMore":true,"nextOffset":25}}
+```
+
+Für die nächste Seite dieselben Filter und `limit` mit `offset = pagination.nextOffset` verwenden. Bei `hasMore = false` ist `nextOffset = null`. Die Sortierung enthält eine eindeutige ID als Tie-Breaker. Gleichzeitiges Anlegen, Archivieren oder Ändern sortierrelevanter Felder kann wie bei jeder Offset-Pagination Seiten verschieben; die Abfragen bilden keinen gemeinsamen Datenbanksnapshot.
+
+Auch `accounting.incoming_invoices.files.list` ist paginiert. Archivierte Einträge bleiben entsprechend der bisherigen MCP-Regel ausgeblendet.
+
+## Ausgangsbeleg-Schemas
+
+`tools/list` beschreibt die Unterfelder von `rows`, `address` und `report` für Beleg-Erstellung und -Bearbeitung sowie Positionen und Report beim Finalisieren. Positionen verwenden `costCentre`, der Beleg selbst `costcentre`. `unit` ist die numerische Einheiten-ID. Preise werden numerisch übergeben. Reportwerte liefert der Aufrufer; MCP berechnet sie nicht. Zusätzliche modulspezifische Objektfelder bleiben zulässig.