diff --git a/src/common/ipc/channels.ts b/src/common/ipc/channels.ts
index 5b488210..6013f6f8 100644
--- a/src/common/ipc/channels.ts
+++ b/src/common/ipc/channels.ts
@@ -159,6 +159,7 @@ export const UTIL_CHANNELS = {
     CHECK_INTERNET_CONNECTIVITY: "check-internet-connectivity",
     FETCH_FAVICON: "fetch-favicon",
     OPEN_IN_CONNECTION_BROWSER: "open-in-connection-browser",
+    RESTART_APP: "restart-app",
 } as const;
 
 // Filesystem-related IPC channels
diff --git a/src/common/types/api.ts b/src/common/types/api.ts
index 099255ec..0ca69ff8 100644
--- a/src/common/types/api.ts
+++ b/src/common/types/api.ts
@@ -40,6 +40,7 @@ export interface UtilsAPI {
     showModalWindow: (options: ModalWindowOptions) => Promise<void>;
     closeModalWindow: () => Promise<void>;
     sendModalMessage: (payload: ModalWindowMessagePayload) => Promise<void>;
+    restartApp: () => Promise<void>;
 }
 
 /**
diff --git a/src/main/index.ts b/src/main/index.ts
index 7bc0d04e..943c03ab 100644
--- a/src/main/index.ts
+++ b/src/main/index.ts
@@ -381,6 +381,7 @@ class ToolBoxApp {
         ipcMain.removeHandler(UTIL_CHANNELS.FETCH_FAVICON);
         ipcMain.removeHandler(UTIL_CHANNELS.OPEN_EXTERNAL);
         ipcMain.removeHandler(UTIL_CHANNELS.OPEN_IN_CONNECTION_BROWSER);
+        ipcMain.removeHandler(UTIL_CHANNELS.RESTART_APP);
 
         // Filesystem handlers
         ipcMain.removeHandler(FILESYSTEM_CHANNELS.READ_TEXT);
@@ -1210,6 +1211,12 @@ class ToolBoxApp {
             this.modalWindowManager?.sendMessageToModal(payload);
         });
 
+        ipcMain.handle(UTIL_CHANNELS.RESTART_APP, () => {
+            this.isQuitting = true;
+            app.relaunch();
+            app.quit();
+        });
+
         // Clipboard handler
         ipcMain.handle(UTIL_CHANNELS.COPY_TO_CLIPBOARD, (_, text) => {
             this.api.copyToClipboard(text);
diff --git a/src/main/managers/toolRegistryManager.ts b/src/main/managers/toolRegistryManager.ts
index 9b3c49fe..45a9ccb2 100644
--- a/src/main/managers/toolRegistryManager.ts
+++ b/src/main/managers/toolRegistryManager.ts
@@ -979,6 +979,9 @@ export class ToolRegistryManager extends EventEmitter {
             minAPI: manifestEntry.minAPI,
             maxAPI: manifestEntry.maxAPI,
             mcpHeadlessEnabled: manifestEntry.mcpHeadlessEnabled,
+            marketplaceSourceId: manifestEntry.marketplaceSourceId,
+            marketplaceSourceLabel: manifestEntry.marketplaceSourceLabel,
+            marketplaceSourceType: manifestEntry.marketplaceSourceType,
         };
     }
 
diff --git a/src/main/preload.ts b/src/main/preload.ts
index 95589ebc..0408540a 100644
--- a/src/main/preload.ts
+++ b/src/main/preload.ts
@@ -185,6 +185,7 @@ contextBridge.exposeInMainWorld("toolboxAPI", {
         showModalWindow: (options: unknown) => ipcRenderer.invoke(UTIL_CHANNELS.SHOW_MODAL_WINDOW, options),
         closeModalWindow: () => ipcRenderer.invoke(UTIL_CHANNELS.CLOSE_MODAL_WINDOW),
         sendModalMessage: (payload: unknown) => ipcRenderer.invoke(UTIL_CHANNELS.SEND_MODAL_MESSAGE, payload),
+        restartApp: () => ipcRenderer.invoke(UTIL_CHANNELS.RESTART_APP),
     },
 
     // Troubleshooting namespace - organized like other features
diff --git a/src/renderer/index.html b/src/renderer/index.html
index 69e0e9ef..49213676 100644
--- a/src/renderer/index.html
+++ b/src/renderer/index.html
@@ -112,6 +112,10 @@ <h2 class="sidebar-title">INSTALLED</h2>
                                 <input type="checkbox" id="tools-update-required-filter" class="filter-checkbox-input" />
                                 <span>Update Available</span>
                             </label>
+                            <label class="filter-checkbox-label" for="tools-private-marketplace-filter" id="tools-private-marketplace-filter-row" style="display: none">
+                                <input type="checkbox" id="tools-private-marketplace-filter" class="filter-checkbox-input" />
+                                <span>Private Marketplace</span>
+                            </label>
                             <label class="filter-checkbox-label" for="tools-mcp-enabled-filter" id="tools-mcp-enabled-filter-row">
                                 <input type="checkbox" id="tools-mcp-enabled-filter" class="filter-checkbox-input" />
                                 <span>MCP Enabled</span>
@@ -263,6 +267,10 @@ <h2 class="sidebar-title">MARKETPLACE</h2>
                                 <input type="checkbox" id="marketplace-new-filter" class="filter-checkbox-input" />
                                 <span>New (last 7 days)</span>
                             </label>
+                            <label class="filter-checkbox-label" id="marketplace-private-marketplace-filter-row" style="display: none">
+                                <input type="checkbox" id="marketplace-private-marketplace-filter" class="filter-checkbox-input" />
+                                <span>Private Marketplace</span>
+                            </label>
                             <label class="filter-checkbox-label" id="marketplace-mcp-enabled-filter-row">
                                 <input type="checkbox" id="marketplace-mcp-enabled-filter" class="filter-checkbox-input" />
                                 <span>MCP Enabled</span>
diff --git a/src/renderer/modules/marketplaceManagement.ts b/src/renderer/modules/marketplaceManagement.ts
index 5a04cba3..db598e35 100644
--- a/src/renderer/modules/marketplaceManagement.ts
+++ b/src/renderer/modules/marketplaceManagement.ts
@@ -62,6 +62,9 @@ export async function loadToolsLibrary(): Promise<void> {
                     isSupported: tool.isSupported, // Include compatibility status
                     npmPackageName: tool.npmPackageName, // Include npm package name for pre-release detection
                     mcpHeadlessEnabled: tool.mcpHeadlessEnabled,
+                    marketplaceSourceId: tool.marketplaceSourceId,
+                    marketplaceSourceLabel: tool.marketplaceSourceLabel,
+                    marketplaceSourceType: tool.marketplaceSourceType,
                 }) as ToolDetail,
         );
 
@@ -106,8 +109,12 @@ export async function loadMarketplace(): Promise<void> {
     const newFilter = document.getElementById("marketplace-new-filter") as HTMLInputElement | null;
     const mcpEnabledFilter = document.getElementById("marketplace-mcp-enabled-filter") as HTMLInputElement | null;
     const mcpEnabledFilterRow = document.getElementById("marketplace-mcp-enabled-filter-row") as HTMLElement | null;
+    const privateMarketplaceFilter = document.getElementById("marketplace-private-marketplace-filter") as HTMLInputElement | null;
+    const privateMarketplaceFilterRow = document.getElementById("marketplace-private-marketplace-filter-row") as HTMLElement | null;
     const sortSelect = document.getElementById("marketplace-sort-select") as HTMLSelectElement | null;
     const mcpPreviewUiEnabled = isMcpPreviewUiEnabled();
+    const userSettings = await window.toolboxAPI.getUserSettings();
+    const hasConfiguredPrivateMarketplace = (userSettings.marketplaceSources || []).some((source) => source.type === "private");
 
     if (mcpEnabledFilterRow) {
         mcpEnabledFilterRow.style.display = mcpPreviewUiEnabled ? "" : "none";
@@ -115,16 +122,23 @@ export async function loadMarketplace(): Promise<void> {
     if (!mcpPreviewUiEnabled && mcpEnabledFilter) {
         mcpEnabledFilter.checked = false;
     }
+    if (privateMarketplaceFilterRow) {
+        privateMarketplaceFilterRow.style.display = hasConfiguredPrivateMarketplace ? "" : "none";
+    }
+    if (!hasConfiguredPrivateMarketplace && privateMarketplaceFilter) {
+        privateMarketplaceFilter.checked = false;
+    }
 
     const searchTerm = searchInput?.value ? searchInput.value.toLowerCase() : "";
     const selectedCategory = categoryFilter?.value || "";
     const selectedAuthor = authorFilter?.value || "";
     const showNewOnly = newFilter?.checked || false;
     const showMcpEnabledOnly = mcpPreviewUiEnabled && (mcpEnabledFilter?.checked || false);
+    const showPrivateMarketplaceOnly = hasConfiguredPrivateMarketplace && (privateMarketplaceFilter?.checked || false);
     const deprecatedToolsVisibility = (await window.toolboxAPI.getSetting("deprecatedToolsVisibility")) || "hide-all";
 
     // Update filter button indicator and one-click clear button visibility
-    const hasDropdownFilters = !!(selectedCategory || selectedAuthor || showNewOnly || showMcpEnabledOnly);
+    const hasDropdownFilters = !!(selectedCategory || selectedAuthor || showNewOnly || showMcpEnabledOnly || showPrivateMarketplaceOnly);
     const marketplaceFilterBtn = document.getElementById("marketplace-filter-btn");
     if (marketplaceFilterBtn) {
         marketplaceFilterBtn.classList.toggle("has-active-filters", hasDropdownFilters);
@@ -180,6 +194,10 @@ export async function loadMarketplace(): Promise<void> {
             return false;
         }
 
+        if (showPrivateMarketplaceOnly && t.marketplaceSourceType !== "private") {
+            return false;
+        }
+
         // Deprecated filter
         if (t.status === "deprecated") {
             if (deprecatedToolsVisibility === "hide-all" || deprecatedToolsVisibility === "show-installed") {
@@ -214,7 +232,7 @@ export async function loadMarketplace(): Promise<void> {
     // Show empty state if no tools match the search
     if (filteredTools.length === 0) {
         const hasSearchTerm = searchTerm.length > 0;
-        const hasActiveFilters = hasSearchTerm || selectedCategory || selectedAuthor || showNewOnly || showMcpEnabledOnly;
+        const hasActiveFilters = hasSearchTerm || selectedCategory || selectedAuthor || showNewOnly || showMcpEnabledOnly || showPrivateMarketplaceOnly;
         const emptyMessage = hasSearchTerm ? "Try a different search term." : hasActiveFilters ? "No tools match the current filters." : "Check back later for new tools.";
         marketplaceList.innerHTML = `
             <div class="empty-state">
@@ -437,6 +455,13 @@ export async function loadMarketplace(): Promise<void> {
         });
     }
 
+    if (privateMarketplaceFilter && !(privateMarketplaceFilter as any)._pptbBound) {
+        (privateMarketplaceFilter as any)._pptbBound = true;
+        privateMarketplaceFilter.addEventListener("change", () => {
+            loadMarketplace();
+        });
+    }
+
     // Setup sort event listener
     if (sortSelect && !(sortSelect as any)._pptbBound) {
         (sortSelect as any)._pptbBound = true;
@@ -764,6 +789,11 @@ function clearMarketplaceFilters(): void {
         mcpEnabledFilter.checked = false;
     }
 
+    const privateMarketplaceFilter = document.getElementById("marketplace-private-marketplace-filter") as HTMLInputElement | null;
+    if (privateMarketplaceFilter) {
+        privateMarketplaceFilter.checked = false;
+    }
+
     // Reload the marketplace to reflect the cleared filters
     loadMarketplace();
 }
@@ -797,6 +827,11 @@ export function clearMarketplaceDropdownFilters(): void {
         mcpEnabledFilter.checked = false;
     }
 
+    const privateMarketplaceFilter = document.getElementById("marketplace-private-marketplace-filter") as HTMLInputElement | null;
+    if (privateMarketplaceFilter) {
+        privateMarketplaceFilter.checked = false;
+    }
+
     // Reload the marketplace to reflect the cleared filters
     loadMarketplace();
 }
diff --git a/src/renderer/modules/settingsManagement.ts b/src/renderer/modules/settingsManagement.ts
index c820df08..2c4d5b93 100644
--- a/src/renderer/modules/settingsManagement.ts
+++ b/src/renderer/modules/settingsManagement.ts
@@ -15,7 +15,9 @@ import {
     MAX_COLOR_BORDER_THICKNESS,
     MIN_COLOR_BORDER_THICKNESS,
 } from "../constants";
+import { getModalStyles } from "../modals/sharedStyles";
 import type { SettingsState } from "../types/index";
+import { offBrowserWindowModalClosed, offBrowserWindowModalMessage, onBrowserWindowModalClosed, onBrowserWindowModalMessage, showBrowserWindowModal } from "./browserWindowModals";
 import { loadMarketplace } from "./marketplaceManagement";
 import { setDefaultNotificationDuration } from "./notifications";
 import {
@@ -144,6 +146,140 @@ function collectMarketplaceSourcesFromSettingsPanel(): MarketplaceSource[] {
     return sources;
 }
 
+function shouldPromptRestartForMarketplaceSourceChanges(previousSources: MarketplaceSource[], nextSources: MarketplaceSource[]): boolean {
+    const previousBuiltInEnabled = previousSources.find((source) => source.id === "builtin-pptb")?.enabled ?? true;
+    const nextBuiltInEnabled = nextSources.find((source) => source.id === "builtin-pptb")?.enabled ?? true;
+
+    const builtInChanged = previousBuiltInEnabled !== nextBuiltInEnabled;
+
+    const normalizePrivateSources = (sources: MarketplaceSource[]) =>
+        sources
+            .filter((source) => source.type === "private")
+            .map((source) => ({
+                id: source.id,
+                label: source.label,
+                url: source.url,
+                enabled: source.enabled,
+            }))
+            .sort((left, right) => left.id.localeCompare(right.id));
+
+    const privateSourcesChanged = JSON.stringify(normalizePrivateSources(previousSources)) !== JSON.stringify(normalizePrivateSources(nextSources));
+
+    return builtInChanged || privateSourcesChanged;
+}
+
+async function promptRestartForMarketplaceSourceChanges(): Promise<boolean> {
+    const modalId = "marketplace-source-restart-required";
+    const restartChannel = "settings:marketplace-restart-now";
+    const laterChannel = "settings:marketplace-restart-later";
+    const isDarkTheme = document.body.classList.contains("dark-theme");
+    const styles = `${getModalStyles(isDarkTheme)}
+<style>
+    .restart-required-hero {
+        border: 1px solid ${isDarkTheme ? "rgba(0, 180, 216, 0.35)" : "rgba(14, 99, 156, 0.25)"};
+        background: ${isDarkTheme ? "linear-gradient(135deg, rgba(0, 180, 216, 0.15) 0%, rgba(106, 0, 255, 0.18) 100%)" : "linear-gradient(135deg, rgba(14, 99, 156, 0.08) 0%, rgba(106, 0, 255, 0.1) 100%)"};
+        border-radius: 10px;
+        padding: 12px 14px;
+        margin-bottom: 12px;
+    }
+
+    .restart-required-hero-title {
+        margin: 0 0 4px;
+        font-size: 14px;
+        font-weight: 600;
+    }
+
+    .restart-required-hero-text {
+        margin: 0;
+        font-size: 13px;
+        line-height: 1.4;
+        color: ${isDarkTheme ? "rgba(255,255,255,0.88)" : "rgba(31,31,31,0.88)"};
+    }
+
+    .restart-required-note {
+        margin: 0;
+        font-size: 13px;
+        line-height: 1.45;
+        color: ${isDarkTheme ? "rgba(255,255,255,0.75)" : "rgba(31,31,31,0.72)"};
+    }
+</style>`;
+    const body = `
+<div class="modal-panel">
+    <div class="modal-header">
+        <div>
+            <p class="modal-eyebrow">Marketplace</p>
+            <h3>Restart Required</h3>
+        </div>
+        <button class="icon-button" id="marketplace-restart-close-btn" aria-label="Close">×</button>
+    </div>
+    <div class="modal-body">
+        <div class="restart-required-hero">
+            <p class="restart-required-hero-title">Marketplace source changes were saved</p>
+            <p class="restart-required-hero-text">Restart Power Platform ToolBox to apply marketplace source updates.</p>
+        </div>
+        <p class="restart-required-note">Marketplace source was changed. These changes take effect after restarting the app.</p>
+    </div>
+    <div class="modal-footer">
+        <button type="button" id="marketplace-restart-later-btn" class="fluent-button fluent-button-secondary">Later</button>
+        <button type="button" id="marketplace-restart-now-btn" class="fluent-button fluent-button-primary">Restart Now</button>
+    </div>
+</div>`;
+    const script = `
+<script>
+(() => {
+    const bridge = window.modalBridge;
+    if (!bridge) return;
+
+    const restartNow = () => bridge.send(${JSON.stringify(restartChannel)});
+    const restartLater = () => bridge.send(${JSON.stringify(laterChannel)});
+
+    document.getElementById("marketplace-restart-now-btn")?.addEventListener("click", restartNow);
+    document.getElementById("marketplace-restart-later-btn")?.addEventListener("click", restartLater);
+    document.getElementById("marketplace-restart-close-btn")?.addEventListener("click", restartLater);
+})();
+</script>`;
+
+    const html = `${styles}\n${body}\n${script}`;
+
+    return await new Promise<boolean>((resolve) => {
+        let shouldRestart = false;
+
+        const onMessage = (payload: { channel: string }) => {
+            if (payload?.channel === restartChannel) {
+                shouldRestart = true;
+                void window.toolboxAPI.utils.closeModalWindow();
+                return;
+            }
+
+            if (payload?.channel === laterChannel) {
+                shouldRestart = false;
+                void window.toolboxAPI.utils.closeModalWindow();
+            }
+        };
+
+        const onClosed = () => {
+            offBrowserWindowModalMessage(onMessage);
+            offBrowserWindowModalClosed(onClosed);
+            resolve(shouldRestart);
+        };
+
+        onBrowserWindowModalMessage(onMessage);
+        onBrowserWindowModalClosed(onClosed);
+
+        showBrowserWindowModal({
+            id: modalId,
+            html,
+            width: 520,
+            height: 320,
+        }).catch((error) => {
+            offBrowserWindowModalMessage(onMessage);
+            offBrowserWindowModalClosed(onClosed);
+            logError(error instanceof Error ? error : new Error(String(error)));
+            resolve(false);
+        });
+    });
+}
+
 /**
  * Load settings into the settings UI panel
  */
@@ -312,6 +448,8 @@ export async function saveSettings(): Promise<void> {
         marketplaceSources,
     };
 
+    const requiresRestartForMarketplaceSources = shouldPromptRestartForMarketplaceSourceChanges(originalSettings.marketplaceSources ?? [], currentSettings.marketplaceSources);
+
     // Only include changed settings in the update
     const changedSettings: any = {};
 
@@ -393,6 +531,13 @@ export async function saveSettings(): Promise<void> {
             body: "Your settings have been saved.",
             type: "success",
         });
+
+        if (changedSettings.marketplaceSources !== undefined && requiresRestartForMarketplaceSources) {
+            const shouldRestart = await promptRestartForMarketplaceSourceChanges();
+            if (shouldRestart) {
+                await window.toolboxAPI.utils.restartApp();
+            }
+        }
     }
     // If no changes, do nothing (no notification shown)
 }
@@ -762,18 +907,22 @@ export function renderSettingsContent(panel: HTMLElement): void {
                     </div>
                 `,
             );
-            const addedRow = marketplaceSourcesList.lastElementChild as HTMLElement | null;
-            addedRow?.querySelector("[data-action='remove-marketplace-source']")?.addEventListener("click", () => {
-                addedRow.remove();
-            });
         });
-    }
 
-    marketplaceSourcesList?.querySelectorAll<HTMLElement>("[data-action='remove-marketplace-source']").forEach((button) => {
-        button.addEventListener("click", () => {
-            button.closest(".settings-vscode-marketplace-source-row")?.remove();
-        });
-    });
+        const list = marketplaceSourcesList as HTMLElement & { _pptbBound?: boolean };
+        if (!list._pptbBound) {
+            list._pptbBound = true;
+            list.addEventListener("click", (event) => {
+                const target = event.target as HTMLElement | null;
+                const removeButton = target?.closest("[data-action='remove-marketplace-source']") as HTMLButtonElement | null;
+                if (!removeButton) {
+                    return;
+                }
+
+                removeButton.closest(".settings-vscode-marketplace-source-row")?.remove();
+            });
+        }
+    }
 
     // Wire up font help link
     const fontHelpLink = panel.querySelector("#font-help-link") as HTMLAnchorElement | null;
diff --git a/src/renderer/modules/toolsSidebarManagement.ts b/src/renderer/modules/toolsSidebarManagement.ts
index 47faaa8d..10474a38 100644
--- a/src/renderer/modules/toolsSidebarManagement.ts
+++ b/src/renderer/modules/toolsSidebarManagement.ts
@@ -69,7 +69,11 @@ export async function loadSidebarTools(): Promise<void> {
         const updateRequiredFilter = document.getElementById("tools-update-required-filter") as CheckboxElement | null;
         const mcpEnabledFilter = document.getElementById("tools-mcp-enabled-filter") as CheckboxElement | null;
         const mcpEnabledFilterRow = document.getElementById("tools-mcp-enabled-filter-row") as HTMLElement | null;
+        const privateMarketplaceFilter = document.getElementById("tools-private-marketplace-filter") as CheckboxElement | null;
+        const privateMarketplaceFilterRow = document.getElementById("tools-private-marketplace-filter-row") as HTMLElement | null;
         const mcpPreviewUiEnabled = isMcpPreviewUiEnabled();
+        const userSettings = await window.toolboxAPI.getUserSettings();
+        const hasConfiguredPrivateMarketplace = (userSettings.marketplaceSources || []).some((source) => source.type === "private");
 
         if (mcpEnabledFilterRow) {
             mcpEnabledFilterRow.style.display = mcpPreviewUiEnabled ? "" : "none";
@@ -77,15 +81,22 @@ export async function loadSidebarTools(): Promise<void> {
         if (!mcpPreviewUiEnabled && mcpEnabledFilter) {
             mcpEnabledFilter.checked = false;
         }
+        if (privateMarketplaceFilterRow) {
+            privateMarketplaceFilterRow.style.display = hasConfiguredPrivateMarketplace ? "" : "none";
+        }
+        if (!hasConfiguredPrivateMarketplace && privateMarketplaceFilter) {
+            privateMarketplaceFilter.checked = false;
+        }
 
         const searchTerm = searchInput?.value ? searchInput.value.toLowerCase() : "";
         const selectedCategory = categoryFilter?.value || "";
         const selectedAuthor = authorFilter?.value || "";
         const showUpdateRequiredOnly = !!updateRequiredFilter?.checked;
         const showMcpEnabledOnly = mcpPreviewUiEnabled && !!mcpEnabledFilter?.checked;
+        const showPrivateMarketplaceOnly = hasConfiguredPrivateMarketplace && !!privateMarketplaceFilter?.checked;
 
         // Update filter button indicator and one-click clear button visibility
-        const hasDropdownFilters = !!(selectedCategory || selectedAuthor || showUpdateRequiredOnly || showMcpEnabledOnly);
+        const hasDropdownFilters = !!(selectedCategory || selectedAuthor || showUpdateRequiredOnly || showMcpEnabledOnly || showPrivateMarketplaceOnly);
         const toolsFilterBtn = document.getElementById("tools-filter-btn");
         if (toolsFilterBtn) {
             toolsFilterBtn.classList.toggle("has-active-filters", hasDropdownFilters);
@@ -139,6 +150,10 @@ export async function loadSidebarTools(): Promise<void> {
                 return false;
             }
 
+            if (showPrivateMarketplaceOnly && t.marketplaceSourceType !== "private") {
+                return false;
+            }
+
             // Deprecated filter
             if (t.status === "deprecated") {
                 if (deprecatedToolsVisibility === "hide-all" || deprecatedToolsVisibility === "show-marketplace") {
@@ -178,7 +193,7 @@ export async function loadSidebarTools(): Promise<void> {
         // Empty state when no matches after filtering
         if (sortedTools.length === 0) {
             const hasSearchTerm = searchTerm.length > 0;
-            const hasActiveFilters = hasSearchTerm || selectedCategory || selectedAuthor || showUpdateRequiredOnly || showMcpEnabledOnly;
+            const hasActiveFilters = hasSearchTerm || selectedCategory || selectedAuthor || showUpdateRequiredOnly || showMcpEnabledOnly || showPrivateMarketplaceOnly;
             const emptyMessage = hasSearchTerm ? `No installed tools match "${searchTerm}".` : hasActiveFilters ? "No tools match the current filters." : "Try a different search term.";
             toolsList.innerHTML = `
                 <div class="empty-state">
@@ -259,6 +274,8 @@ export async function loadSidebarTools(): Promise<void> {
                     toolSourceClass = "tool-item-pptb-local";
                 } else if (tool.id.startsWith("npm-")) {
                     toolSourceClass = "tool-item-pptb-npm";
+                } else if (tool.marketplaceSourceType === "private") {
+                    toolSourceClass = "tool-item-pptb-private-marketplace";
                 }
 
                 const analyticsHtml = `<div class="tool-analytics-left">${sourceIconHtml}${
@@ -458,6 +475,7 @@ export async function loadSidebarTools(): Promise<void> {
     const authorFilter = document.getElementById("tools-author-filter") as HTMLSelectElement | null;
     const updateRequiredFilter = document.getElementById("tools-update-required-filter") as CheckboxElement | null;
     const mcpEnabledFilter = document.getElementById("tools-mcp-enabled-filter") as CheckboxElement | null;
+    const privateMarketplaceFilter = document.getElementById("tools-private-marketplace-filter") as CheckboxElement | null;
 
     if (searchInput && !(searchInput as any)._pptbBound) {
         (searchInput as any)._pptbBound = true;
@@ -495,6 +513,13 @@ export async function loadSidebarTools(): Promise<void> {
         });
     }
 
+    if (privateMarketplaceFilter && !privateMarketplaceFilter._pptbBound) {
+        privateMarketplaceFilter._pptbBound = true;
+        privateMarketplaceFilter.addEventListener("change", () => {
+            loadSidebarTools();
+        });
+    }
+
     // Setup sort event listener
     const sortSelect = document.getElementById("tools-sort-select") as HTMLSelectElement | null;
     if (sortSelect && !(sortSelect as any)._pptbBound) {
@@ -798,6 +823,11 @@ function clearAllFilters(): void {
         mcpEnabledFilter.checked = false;
     }
 
+    const privateMarketplaceFilter = document.getElementById("tools-private-marketplace-filter") as CheckboxElement | null;
+    if (privateMarketplaceFilter) {
+        privateMarketplaceFilter.checked = false;
+    }
+
     // Reload the sidebar tools to reflect the cleared filters
     loadSidebarTools();
 }
@@ -829,6 +859,11 @@ export function clearInstalledToolsDropdownFilters(): void {
         mcpEnabledFilter.checked = false;
     }
 
+    const privateMarketplaceFilter = document.getElementById("tools-private-marketplace-filter") as CheckboxElement | null;
+    if (privateMarketplaceFilter) {
+        privateMarketplaceFilter.checked = false;
+    }
+
     // Reload the sidebar tools to reflect the cleared filters
     loadSidebarTools();
 }
diff --git a/src/renderer/styles.scss b/src/renderer/styles.scss
index 67a11635..7cb97f77 100644
--- a/src/renderer/styles.scss
+++ b/src/renderer/styles.scss
@@ -3151,6 +3151,10 @@ body.dark-theme .search-filter-btn.active img {
     border-left: 4px solid var(--accent-color-alt);
 }
 
+.tool-item-pptb-private-marketplace {
+    border-left: 4px solid #d97706;
+}
+
 .tool-item-pptb:hover {
     background: rgba(0, 120, 212, 0.06);
     box-shadow: 0 4px 10px rgba(0, 0, 0, 0.08);
diff --git a/src/renderer/types/index.ts b/src/renderer/types/index.ts
index 9187379e..9aa86a33 100644
--- a/src/renderer/types/index.ts
+++ b/src/renderer/types/index.ts
@@ -109,4 +109,7 @@ export interface ToolDetail {
     isSupported?: boolean; // Whether this tool is compatible with current ToolBox version
     npmPackageName?: string; // npm package name used for pre-release version detection
     mcpHeadlessEnabled?: boolean; // Whether this tool supports MCP headless execution
+    marketplaceSourceId?: string;
+    marketplaceSourceLabel?: string;
+    marketplaceSourceType?: "builtin" | "private";
 }