Add SaaS MCP usage tab (#6590)

frontend/editor/public/locales/en-GB/translation.toml

@@ -3049,6 +3049,37 @@ impact = "Any applications or services currently using these keys will stop work
 title = "Refresh API Keys"
 warning = "⚠️ Warning: This action will generate new API keys and make your previous keys invalid."
 
+[config.mcp]
+description = "Model Context Protocol (MCP) lets AI assistants like Claude use your Stirling PDF tools directly. Connect a client once and your assistant can convert, edit, secure and process documents on your behalf."
+navLabel = "MCP Server"
+tip = "Every action your assistant runs is performed as your account and counts towards your usage, just like using Stirling PDF directly."
+title = "MCP Server"
+viewApiKeys = "View API keys"
+
+[config.mcp.copy]
+configLabel = "Config"
+copied = "Copied"
+copy = "Copy"
+endpointLabel = "Endpoint URL"
+tooltip = "Copy {{label}}"
+tooltipCopied = "{{label}} copied"
+
+[config.mcp.endpoint]
+label = "Your MCP endpoint"
+
+[config.mcp.setup]
+addTo = "Add to"
+hint = "Pick your client, paste the snippet into the file shown, then restart it. You'll sign in with your Stirling account on first use - no keys to copy."
+title = "Connect your AI assistant"
+
+[config.mcp.tools]
+ai = "AI"
+convert = "Convert"
+misc = "Misc"
+pages = "Pages"
+security = "Security"
+title = "What your assistant can do"
+
 [config.overview]
 description = "Current application settings and configuration details."
 error = "Error"
@@ -3210,7 +3241,6 @@ creditsRemaining = "{{current}} of {{total}} remaining"
 creditsThisMonth = "Monthly credits"
 current = "Current Plan"
 customPricing = "Custom"
-customWatchedFolders = "Custom Watched Folders"
 dedicatedSupportSlas = "Dedicated support & SLAs"
 enterpriseSubscription = "Enterprise"
 everythingInCredits = "Everything in Credits, plus:"
@@ -3518,7 +3548,6 @@ addFiles = "Add Files"
 
 [fileManager]
 active = "Active"
-addToWatchedFolder = "Add to Watched Folder"
 addToUpload = "Add to Upload"
 changesNotUploaded = "Changes not uploaded"
 clearAll = "Clear All"
@@ -4563,10 +4592,8 @@ sendResetLink = "Send reset link"
 sessionExpired = "Your session has expired. Please sign in again."
 createAccount = "Create an account"
 signin = "Sign in"
-signInAnonymously = "Sign Up as a Guest"
 signingIn = "Signing in..."
 signInWith = "Sign in with"
-subtitle = "Sign back in to Stirling PDF"
 title = "Sign in"
 unexpectedError = "Unexpected error: {{message}}"
 updatePassword = "Update password"
@@ -5782,7 +5809,6 @@ label = "SMTP Username"
 
 [quickAccess]
 access = "Access"
-watchedFolders = "Watched Folders"
 accessAddPerson = "Add another person"
 accessBack = "Back"
 accessCopyLink = "Copy link"
@@ -6873,6 +6899,7 @@ createFailed = "Failed to create signing request"
 
 [signup]
 accountCreatedSuccessfully = "Account created successfully! You can now sign in."
+alreadyHaveAccount = "I already have an account"
 checkEmailConfirmation = "Check your email for a confirmation link to complete your registration."
 confirmPassword = "Confirm password"
 confirmPasswordPlaceholder = "Confirm password"
@@ -6898,7 +6925,6 @@ skip = "Skip"
 subtitle = "Join Stirling PDF to get started"
 title = "Create an account"
 unexpectedError = "Unexpected error: {{message}}"
-useEmailInstead = "Use Email Instead"
 
 [sizes]
 large = "Large"
@@ -8172,20 +8198,14 @@ newFolder = "New folder"
 noFolders = "No watched folders yet"
 sidebarTitle = "Watched Folders"
 title = "Watched Folders"
-sidebarFiles = "My Files"
 
 [watchedFolders.modal]
 automation = "Automation"
-automationSaved = "Automation saved"
 createFolder = "Create Folder"
-stepsSaved = "Steps saved — click Create Folder to finish"
 automationRequired = "Add at least one configured step before saving."
 color = "Accent color"
 createTitle = "New Watched Folder"
-description = "Description"
-descriptionPlaceholder = "What does this folder do?"
 editTitle = "Edit Watched Folder"
-icon = "Icon"
 name = "Folder name"
 namePlaceholder = "My Watched Folder"
 nameRequired = "Folder name is required"
@@ -8193,17 +8213,13 @@ nameTooLong = "Folder name must be 50 characters or less"
 saveChanges = "Save Changes"
 saveFailed = "Failed to save folder. Please try again."
 automationNameFallback = "Watched Folder automation"
-retryLabel = "Auto-retry"
 maxRetries = "Max retries"
-maxRetriesDesc = "0 to disable"
 retryDelay = "Delay (minutes)"
-outputLabel = "Output"
 outputModeVersion = "Replace original?"
 outputModeVersionDesc = "Output becomes a new version of the input file rather than a separate file"
 outputModeNewDesc = "Output is saved as a new separate file"
 outputName = "Output filename prefix"
 outputNameSuffix = "Suffix"
-outputNamePlaceholderVersion = "Same as original"
 sectionFolder = "Folder"
 sectionSourceOutput = "Source & Output"
 sectionSteps = "Steps"
@@ -8230,14 +8246,10 @@ positionSuffix = "Suffix"
 
 [watchedFolders.home]
 create = "Create your first Watched Folder"
-dropHere = "Drop to process"
 editFolder = "Edit folder"
 empty = "No watched folders yet"
 file = "file"
 files = "files"
-openFolder = "Open folder"
-title = "Watched Folders"
-subtitle = "Folders that automatically process PDFs with your configured pipeline"
 emptyTitle = "Automate your PDF workflows"
 emptyDesc = "Set up a Watched Folder once. Drop PDFs in and they're automatically compressed, OCR'd, split, merged — whatever your pipeline does."
 addAnother = "Add another Watched Folder"
@@ -8245,7 +8257,6 @@ addAnotherDesc = "Automatically process files with a new pipeline"
 resume = "Resume"
 pause = "Pause"
 deleteFolder = "Delete folder"
-noSteps = "No automation steps configured"
 
 [watchedFolders.card]
 edit = "Edit folder"
@@ -8328,7 +8339,6 @@ previewLoadFailed = "Could not load file preview."
 back = "Back"
 dismiss = "Dismiss"
 retry = "Retry"
-view = "View"
 download = "Download"
 downloadInput = "Download input"
 downloadOutput = "Download output"

frontend/editor/src/saas/components/shared/config/configSections/McpSection.tsx

@@ -0,0 +1,262 @@
+import { useMemo } from "react";
+import { useTranslation } from "react-i18next";
+import {
+  Stack,
+  Paper,
+  Text,
+  Group,
+  Alert,
+  Code,
+  Badge,
+  Button,
+  CopyButton,
+  Tabs,
+  Tooltip,
+  ThemeIcon,
+} from "@mantine/core";
+import LocalIcon from "@app/components/shared/LocalIcon";
+import { useAppConfig } from "@app/contexts/AppConfigContext";
+import { openAppSettings } from "@app/utils/appSettings";
+
+/** Strip a single trailing slash so we can safely append paths. */
+function trimTrailingSlash(url: string): string {
+  return url.endsWith("/") ? url.slice(0, -1) : url;
+}
+
+/** A small copy-to-clipboard button that sits inline next to a URL/snippet. */
+function CopyInline({ value, label }: { value: string; label: string }) {
+  const { t } = useTranslation();
+  return (
+    <CopyButton value={value} timeout={1500}>
+      {({ copied, copy }) => (
+        <Tooltip
+          label={
+            copied
+              ? t("config.mcp.copy.tooltipCopied", "{{label}} copied", {
+                  label,
+                })
+              : t("config.mcp.copy.tooltip", "Copy {{label}}", { label })
+          }
+          withArrow
+        >
+          <Button
+            size="compact-xs"
+            variant="subtle"
+            color={copied ? "teal" : "gray"}
+            onClick={copy}
+            leftSection={
+              <LocalIcon
+                icon={copied ? "check-rounded" : "content-copy-rounded"}
+                width={14}
+                height={14}
+              />
+            }
+          >
+            {copied
+              ? t("config.mcp.copy.copied", "Copied")
+              : t("config.mcp.copy.copy", "Copy")}
+          </Button>
+        </Tooltip>
+      )}
+    </CopyButton>
+  );
+}
+
+// SaaS MCP guide: always shown, explains how to point an AI assistant at the
+// OAuth-protected /mcp endpoint with per-client config.
+export default function McpSection() {
+  const { t } = useTranslation();
+  const { config } = useAppConfig();
+
+  const baseUrl = useMemo(() => {
+    const raw =
+      config?.baseUrl ||
+      (typeof window !== "undefined" ? window.location.origin : "");
+    return trimTrailingSlash(raw);
+  }, [config?.baseUrl]);
+
+  const mcpUrl = `${baseUrl}/mcp`;
+
+  // Per-client connection snippets pointing at this deployment's /mcp endpoint.
+  const clients = useMemo(
+    () => [
+      {
+        value: "claude",
+        label: "Claude Desktop",
+        file: "claude_desktop_config.json",
+        config: JSON.stringify(
+          { mcpServers: { "stirling-pdf": { type: "http", url: mcpUrl } } },
+          null,
+          2,
+        ),
+      },
+      {
+        value: "codex",
+        label: "Codex CLI",
+        file: "~/.codex/config.toml",
+        config: `[mcp_servers.stirling-pdf]\nurl = "${mcpUrl}"`,
+      },
+      {
+        value: "vscode",
+        label: "VS Code",
+        file: ".vscode/mcp.json",
+        config: JSON.stringify(
+          { servers: { "stirling-pdf": { type: "http", url: mcpUrl } } },
+          null,
+          2,
+        ),
+      },
+    ],
+    [mcpUrl],
+  );
+
+  const tools: { icon: string; key: string; fallback: string }[] = [
+    {
+      icon: "sync-alt-rounded",
+      key: "config.mcp.tools.convert",
+      fallback: "Convert",
+    },
+    {
+      icon: "description-rounded",
+      key: "config.mcp.tools.pages",
+      fallback: "Pages",
+    },
+    { icon: "lock", key: "config.mcp.tools.security", fallback: "Security" },
+    {
+      icon: "construction-rounded",
+      key: "config.mcp.tools.misc",
+      fallback: "Misc",
+    },
+    { icon: "smart-toy-rounded", key: "config.mcp.tools.ai", fallback: "AI" },
+  ];
+
+  return (
+    <div className="settings-section-container">
+      <Stack gap="md" className="settings-section-content">
+        <div>
+          <Group gap="sm" align="center">
+            <ThemeIcon variant="light" size="lg" radius="md">
+              <LocalIcon icon="smart-toy-rounded" width={22} height={22} />
+            </ThemeIcon>
+            <Text fw={600} size="lg">
+              {t("config.mcp.title", "MCP Server")}
+            </Text>
+          </Group>
+          <Text size="sm" c="dimmed" mt={6}>
+            {t(
+              "config.mcp.description",
+              "Model Context Protocol (MCP) lets AI assistants like Claude use your Stirling PDF tools directly. Connect a client once and your assistant can convert, edit, secure and process documents on your behalf.",
+            )}
+          </Text>
+        </div>
+
+        {/* Endpoint */}
+        <Paper withBorder p="sm" radius="md">
+          <Group gap="xs" wrap="nowrap" align="center">
+            <Stack gap={2} style={{ flex: 1, minWidth: 0 }}>
+              <Text fw={500} size="sm">
+                {t("config.mcp.endpoint.label", "Your MCP endpoint")}
+              </Text>
+              <Code style={{ overflowX: "auto" }}>{mcpUrl}</Code>
+            </Stack>
+            <CopyInline
+              value={mcpUrl}
+              label={t("config.mcp.copy.endpointLabel", "Endpoint URL")}
+            />
+          </Group>
+        </Paper>
+
+        {/* Per-client setup */}
+        <Paper withBorder p="sm" radius="md">
+          <Stack gap="xs">
+            <Text fw={500} size="sm">
+              {t("config.mcp.setup.title", "Connect your AI assistant")}
+            </Text>
+            <Text size="xs" c="dimmed">
+              {t(
+                "config.mcp.setup.hint",
+                "Pick your client, paste the snippet into the file shown, then restart it. You'll sign in with your Stirling account on first use - no keys to copy.",
+              )}
+            </Text>
+            <Tabs defaultValue="claude" variant="pills" radius="md" mt={4}>
+              <Tabs.List>
+                {clients.map((c) => (
+                  <Tabs.Tab key={c.value} value={c.value}>
+                    {c.label}
+                  </Tabs.Tab>
+                ))}
+              </Tabs.List>
+              {clients.map((c) => (
+                <Tabs.Panel key={c.value} value={c.value} pt="sm">
+                  <Stack gap="xs">
+                    <Group justify="space-between" align="center" wrap="nowrap">
+                      <Text size="xs" c="dimmed">
+                        {t("config.mcp.setup.addTo", "Add to")}{" "}
+                        <Code>{c.file}</Code>
+                      </Text>
+                      <CopyInline
+                        value={c.config}
+                        label={t("config.mcp.copy.configLabel", "Config")}
+                      />
+                    </Group>
+                    <Code block>{c.config}</Code>
+                  </Stack>
+                </Tabs.Panel>
+              ))}
+            </Tabs>
+          </Stack>
+        </Paper>
+
+        {/* Available tools */}
+        <div>
+          <Text fw={500} size="sm" mb="xs">
+            {t("config.mcp.tools.title", "What your assistant can do")}
+          </Text>
+          <Group gap="xs">
+            {tools.map((tool) => (
+              <Badge
+                key={tool.key}
+                variant="light"
+                color="gray"
+                radius="sm"
+                size="lg"
+                leftSection={
+                  <LocalIcon icon={tool.icon} width={13} height={13} />
+                }
+              >
+                {t(tool.key, tool.fallback)}
+              </Badge>
+            ))}
+          </Group>
+        </div>
+
+        {/* Tip / cross-link */}
+        <Alert
+          variant="light"
+          color="blue"
+          icon={<LocalIcon icon="info-rounded" width="1rem" height="1rem" />}
+        >
+          <Group justify="space-between" align="center" wrap="nowrap" gap="sm">
+            <Text size="sm">
+              {t(
+                "config.mcp.tip",
+                "Every action your assistant runs is performed as your account and counts towards your usage, just like using Stirling PDF directly.",
+              )}
+            </Text>
+            <Button
+              size="xs"
+              variant="light"
+              style={{ flexShrink: 0 }}
+              leftSection={
+                <LocalIcon icon="key-rounded" width={14} height={14} />
+              }
+              onClick={() => openAppSettings("api-keys")}
+            >
+              {t("config.mcp.viewApiKeys", "View API keys")}
+            </Button>
+          </Group>
+        </Alert>
+      </Stack>
+    </div>
+  );
+}

frontend/editor/src/saas/components/shared/config/saasConfigNavSections.tsx

@@ -9,6 +9,7 @@ import GeneralSection from "@app/components/shared/config/configSections/General
 import PasswordSecurity from "@app/components/shared/config/configSections/PasswordSecurity";
 import ApiKeys from "@app/components/shared/config/configSections/ApiKeys";
 import Plan from "@app/components/shared/config/configSections/Plan";
+import McpSection from "@app/components/shared/config/configSections/McpSection";
 
 type OverviewComponent = React.ComponentType<{ onLogoutClick: () => void }>;
 
@@ -108,6 +109,44 @@ function appendBillingSection(
   ];
 }
 
+// Add an "MCP Server" tab in the Developer section. Always shown in SaaS;
+// purely informational, so it appears for anonymous users too.
+function appendMcpSection(
+  sections: ConfigNavSection[],
+  t: TFunction<"translation", undefined>,
+): ConfigNavSection[] {
+  const hasMcp = sections.some((section) =>
+    section.items.some((item) => item.key === "mcp"),
+  );
+
+  if (hasMcp) {
+    return sections;
+  }
+
+  const mcpItem = {
+    key: "mcp" as const,
+    label: t("config.mcp.navLabel", "MCP Server"),
+    icon: "smart-toy-rounded",
+    component: <McpSection />,
+  };
+
+  const developerIndex = sections.findIndex((section) =>
+    section.items.some(
+      (item) => item.key === "developer" || item.key === "api-keys",
+    ),
+  );
+
+  if (developerIndex === -1) {
+    return [...sections, { title: "Developer", items: [mcpItem] }];
+  }
+
+  return sections.map((section, index) =>
+    index === developerIndex
+      ? { ...section, items: [...section.items, mcpItem] }
+      : section,
+  );
+}
+
 export function createSaasConfigNavSections(
   Overview: OverviewComponent,
   onLogoutClick: () => void,
@@ -151,6 +190,7 @@ export function createSaasConfigNavSections(
 
   sections = ensurePreferencesSection(sections);
   sections = appendDeveloperSection(sections);
+  sections = appendMcpSection(sections, t);
 
   if (!isAnonymous) {
     sections = appendBillingSection(sections, t);

frontend/editor/src/saas/components/shared/config/types.ts

@@ -1,8 +1,9 @@
 import { VALID_NAV_KEYS as CORE_NAV_KEYS } from "@core/components/shared/config/types";
 
-// SaaS adds an "overview" account section. All other keys (including ones
+// SaaS adds an "overview" account section and an "mcp" integrations tab. All
-// SaaS doesn't render today) come from core - subtracting them here would
+// other keys (including ones SaaS doesn't render today) come from core -
-// just break the type union without affecting runtime nav.
+// subtracting them here would just break the type union without affecting
-export const VALID_NAV_KEYS = [...CORE_NAV_KEYS, "overview"] as const;
+// runtime nav.
+export const VALID_NAV_KEYS = [...CORE_NAV_KEYS, "overview", "mcp"] as const;
 
 export type NavKey = (typeof VALID_NAV_KEYS)[number];

frontend/editor/src/saas/services/apiClient.test.ts

@@ -13,6 +13,15 @@ vi.mock("@app/auth/supabase", () => ({
   },
 }));
 
+// Stub apiClient's heavy UI/util deps so importing it stays cheap. None are
+// exercised here (toast, plan settings and handleHttpError paths aren't hit),
+// and re-importing the real toast graph per test made these tests time out.
+vi.mock("@app/components/toast", () => ({ alert: vi.fn() }));
+vi.mock("@app/utils/appSettings", () => ({ openPlanSettings: vi.fn() }));
+vi.mock("@app/services/httpErrorHandler", () => ({
+  handleHttpError: vi.fn().mockResolvedValue(undefined),
+}));
+
 describe("apiClient", () => {
   beforeEach(() => {
     vi.clearAllMocks();