diff --git a/src/main/services/extensions/install/McpInstallService.ts b/src/main/services/extensions/install/McpInstallService.ts
index 779e6178..687c904a 100644
--- a/src/main/services/extensions/install/McpInstallService.ts
+++ b/src/main/services/extensions/install/McpInstallService.ts
@@ -37,6 +37,10 @@ const HEADER_KEY_RE = /^[A-Za-z][\w-]{0,100}$/;
 
 const TIMEOUT_MS = 30_000;
 
+function scopeRequiresProjectPath(scope?: string): boolean {
+  return scope === 'local' || scope === 'project';
+}
+
 export class McpInstallService {
   constructor(private readonly aggregator: McpCatalogAggregator) {}
 
@@ -59,10 +63,10 @@ export class McpInstallService {
       };
     }
 
-    if (scope === 'project' && !projectPath) {
+    if (scopeRequiresProjectPath(scope) && !projectPath) {
       return {
         state: 'error',
-        error: 'projectPath is required for project scope',
+        error: `projectPath is required for ${scope} scope`,
       };
     }
 
@@ -219,8 +223,8 @@ export class McpInstallService {
       return { state: 'error', error: `Invalid scope: "${scope}".` };
     }
 
-    if (scope === 'project' && !projectPath) {
-      return { state: 'error', error: 'projectPath is required for project scope' };
+    if (scopeRequiresProjectPath(scope) && !projectPath) {
+      return { state: 'error', error: `projectPath is required for ${scope} scope` };
     }
 
     for (const key of Object.keys(envValues)) {
@@ -330,10 +334,10 @@ export class McpInstallService {
       };
     }
 
-    if (scope === 'project' && !projectPath) {
+    if (scopeRequiresProjectPath(scope) && !projectPath) {
       return {
         state: 'error',
-        error: 'projectPath is required for project scope',
+        error: `projectPath is required for ${scope} scope`,
       };
     }
 
diff --git a/src/renderer/components/extensions/mcp/CustomMcpServerDialog.tsx b/src/renderer/components/extensions/mcp/CustomMcpServerDialog.tsx
index b096287e..7cb8e740 100644
--- a/src/renderer/components/extensions/mcp/CustomMcpServerDialog.tsx
+++ b/src/renderer/components/extensions/mcp/CustomMcpServerDialog.tsx
@@ -105,7 +105,7 @@ export const CustomMcpServerDialog = ({
   }, [open]);
 
   useEffect(() => {
-    if (open && scope === 'project' && !projectPath) {
+    if (open && scope !== 'user' && !projectPath) {
       setScope('user');
     }
   }, [open, projectPath, scope]);
@@ -177,7 +177,7 @@ export const CustomMcpServerDialog = ({
     const request: McpCustomInstallRequest = {
       serverName,
       scope,
-      projectPath: scope === 'project' ? (projectPath ?? undefined) : undefined,
+      projectPath: scope !== 'user' ? (projectPath ?? undefined) : undefined,
       installSpec,
       envValues,
       headers: headers.filter((h) => h.key.trim() && h.value.trim()),
@@ -207,7 +207,7 @@ export const CustomMcpServerDialog = ({
   const canSubmit =
     serverName.trim() &&
     (transportMode === 'stdio' ? npmPackage.trim() : httpUrl.trim()) &&
-    !(scope === 'project' && !projectPath) &&
+    !(scope !== 'user' && !projectPath) &&
     !installing;
 
   return (
@@ -386,7 +386,7 @@ export const CustomMcpServerDialog = ({
                   <SelectItem
                     key={opt.value}
                     value={opt.value}
-                    disabled={opt.value === 'project' && !projectPath}
+                    disabled={opt.value !== 'user' && !projectPath}
                   >
                     {opt.label}
                   </SelectItem>
diff --git a/src/renderer/components/extensions/mcp/McpServerDetailDialog.tsx b/src/renderer/components/extensions/mcp/McpServerDetailDialog.tsx
index 91f3b2f8..43b49c27 100644
--- a/src/renderer/components/extensions/mcp/McpServerDetailDialog.tsx
+++ b/src/renderer/components/extensions/mcp/McpServerDetailDialog.tsx
@@ -132,7 +132,7 @@ export const McpServerDetailDialog = ({
   }, [open, scope, selectedInstalledEntry?.name, server]);
 
   useEffect(() => {
-    if (open && scope === 'project' && !projectPath) {
+    if (open && scope !== 'user' && !projectPath) {
       setScope('user');
     }
   }, [open, projectPath, scope]);
@@ -179,7 +179,7 @@ export const McpServerDetailDialog = ({
   const isInstalledForScope = selectedInstalledEntry !== null;
   const uninstallServerName = selectedInstalledEntry?.name ?? serverName;
   const uninstallScope = selectedInstalledEntry?.scope ?? scope;
-  const scopeRequiresProjectPath = scope === 'project' && !projectPath;
+  const scopeRequiresProjectPath = scope !== 'user' && !projectPath;
   const installDisabled =
     !serverName.trim() ||
     missingRequiredEnvVars ||
@@ -199,7 +199,7 @@ export const McpServerDetailDialog = ({
       registryId: server.id,
       serverName,
       scope,
-      projectPath: scope === 'project' ? (projectPath ?? undefined) : undefined,
+      projectPath: scope !== 'user' ? (projectPath ?? undefined) : undefined,
       envValues,
       headers,
     });
@@ -210,7 +210,7 @@ export const McpServerDetailDialog = ({
       server.id,
       uninstallServerName,
       uninstallScope,
-      uninstallScope === 'project' ? (projectPath ?? undefined) : undefined
+      uninstallScope !== 'user' ? (projectPath ?? undefined) : undefined
     );
   };
 
@@ -417,7 +417,7 @@ export const McpServerDetailDialog = ({
                     <SelectItem
                       key={opt.value}
                       value={opt.value}
-                      disabled={opt.value === 'project' && !projectPath}
+                      disabled={opt.value !== 'user' && !projectPath}
                     >
                       {opt.label}
                     </SelectItem>
diff --git a/test/main/services/extensions/McpInstallService.test.ts b/test/main/services/extensions/McpInstallService.test.ts
index 1320d359..f67716ad 100644
--- a/test/main/services/extensions/McpInstallService.test.ts
+++ b/test/main/services/extensions/McpInstallService.test.ts
@@ -130,6 +130,7 @@ describe('McpInstallService', () => {
         registryId: 'upstash/context7-mcp',
         serverName: 'context7',
         scope: 'local',
+        projectPath: '/tmp/test',
         envValues: {},
         headers: [],
       });
@@ -230,6 +231,20 @@ describe('McpInstallService', () => {
       expect(result.error).toContain('projectPath is required');
       expect(mockExecCli).not.toHaveBeenCalled();
     });
+
+    it('rejects local scope install without project path', async () => {
+      const result = await service.install({
+        registryId: 'upstash/context7-mcp',
+        serverName: 'context7',
+        scope: 'local',
+        envValues: {},
+        headers: [],
+      });
+
+      expect(result.state).toBe('error');
+      expect(result.error).toContain('projectPath is required');
+      expect(mockExecCli).not.toHaveBeenCalled();
+    });
   });
 
   // ── install: error masking ──────────────────────────────────────────────────
@@ -290,6 +305,23 @@ describe('McpInstallService', () => {
       expect(result.error).toContain('projectPath is required');
       expect(mockExecCli).not.toHaveBeenCalled();
     });
+
+    it('rejects local scope custom install without project path', async () => {
+      const result = await service.installCustom({
+        serverName: 'custom-context7',
+        scope: 'local',
+        installSpec: {
+          type: 'stdio',
+          npmPackage: '@upstash/context7-mcp',
+        },
+        envValues: {},
+        headers: [],
+      });
+
+      expect(result.state).toBe('error');
+      expect(result.error).toContain('projectPath is required');
+      expect(mockExecCli).not.toHaveBeenCalled();
+    });
   });
 
   // ── uninstall ───────────────────────────────────────────────────────────────
@@ -334,6 +366,14 @@ describe('McpInstallService', () => {
       expect(mockExecCli).not.toHaveBeenCalled();
     });
 
+    it('rejects local scope uninstall without project path', async () => {
+      const result = await service.uninstall('context7', 'local');
+
+      expect(result.state).toBe('error');
+      expect(result.error).toContain('projectPath is required');
+      expect(mockExecCli).not.toHaveBeenCalled();
+    });
+
     it('returns error on CLI failure', async () => {
       mockExecCli.mockRejectedValue(new Error('Not found'));
 
diff --git a/test/renderer/components/extensions/mcp/CustomMcpServerDialog.test.ts b/test/renderer/components/extensions/mcp/CustomMcpServerDialog.test.ts
index 9dd675ef..31ef3d9f 100644
--- a/test/renderer/components/extensions/mcp/CustomMcpServerDialog.test.ts
+++ b/test/renderer/components/extensions/mcp/CustomMcpServerDialog.test.ts
@@ -125,7 +125,7 @@ describe('CustomMcpServerDialog project scope', () => {
     vi.unstubAllGlobals();
   });
 
-  it('disables project scope without an active project', async () => {
+  it('disables non-user scopes without an active project', async () => {
     const host = document.createElement('div');
     document.body.appendChild(host);
     const root = createRoot(host);
@@ -142,7 +142,9 @@ describe('CustomMcpServerDialog project scope', () => {
     });
 
     const projectOption = host.querySelector('option[value="project"]') as HTMLOptionElement;
+    const localOption = host.querySelector('option[value="local"]') as HTMLOptionElement;
     expect(projectOption.disabled).toBe(true);
+    expect(localOption.disabled).toBe(true);
 
     await act(async () => {
       root.unmount();
@@ -203,4 +205,58 @@ describe('CustomMcpServerDialog project scope', () => {
       await Promise.resolve();
     });
   });
+
+  it('passes projectPath for local-scoped custom installs', async () => {
+    const host = document.createElement('div');
+    document.body.appendChild(host);
+    const root = createRoot(host);
+    const onClose = vi.fn();
+    const projectPath = '/tmp/custom-mcp-project';
+
+    await act(async () => {
+      root.render(
+        React.createElement(CustomMcpServerDialog, {
+          open: true,
+          onClose,
+          projectPath,
+        })
+      );
+      await Promise.resolve();
+    });
+
+    const nameInput = host.querySelector('#custom-name') as HTMLInputElement;
+    const packageInput = host.querySelector('#custom-npm') as HTMLInputElement;
+    const scopeSelect = host.querySelector('[data-testid="scope-select"]') as HTMLSelectElement;
+
+    await act(async () => {
+      setNativeValue(nameInput, 'local-context7', 'input');
+      setNativeValue(packageInput, '@upstash/context7-mcp', 'input');
+      setNativeValue(scopeSelect, 'local', 'change');
+      await Promise.resolve();
+    });
+
+    const installButton = Array.from(host.querySelectorAll('button')).find(
+      (button) => button.textContent === 'Install'
+    ) as HTMLButtonElement;
+    expect(installButton.disabled).toBe(false);
+
+    await act(async () => {
+      installButton.click();
+      await Promise.resolve();
+    });
+
+    expect(storeState.installCustomMcpServer).toHaveBeenCalledWith(
+      expect.objectContaining({
+        serverName: 'local-context7',
+        scope: 'local',
+        projectPath,
+      })
+    );
+    expect(onClose).toHaveBeenCalledTimes(1);
+
+    await act(async () => {
+      root.unmount();
+      await Promise.resolve();
+    });
+  });
 });
diff --git a/test/renderer/components/extensions/mcp/McpServerDetailDialog.test.ts b/test/renderer/components/extensions/mcp/McpServerDetailDialog.test.ts
index 356415e9..262161bd 100644
--- a/test/renderer/components/extensions/mcp/McpServerDetailDialog.test.ts
+++ b/test/renderer/components/extensions/mcp/McpServerDetailDialog.test.ts
@@ -217,7 +217,7 @@ describe('McpServerDetailDialog installed entry handling', () => {
       'io.github.upstash/context7',
       'context7-local',
       'local',
-      undefined
+      '/tmp/project'
     );
 
     await act(async () => {
@@ -258,6 +258,10 @@ describe('McpServerDetailDialog installed entry handling', () => {
 
     expect(lookupMock).toHaveBeenCalledTimes(1);
     expect(lookupMock).toHaveBeenCalledWith(['CONTEXT7_API_KEY']);
+    const projectOption = host.querySelector('option[value="project"]') as HTMLOptionElement;
+    const localOption = host.querySelector('option[value="local"]') as HTMLOptionElement;
+    expect(projectOption.disabled).toBe(true);
+    expect(localOption.disabled).toBe(true);
 
     await act(async () => {
       root.unmount();
@@ -352,6 +356,90 @@ describe('McpServerDetailDialog installed entry handling', () => {
     });
   });
 
+  it('passes project path for local-scoped installs and uninstalls', async () => {
+    const host = document.createElement('div');
+    document.body.appendChild(host);
+    const root = createRoot(host);
+    const projectPath = '/tmp/local-context7';
+    const installedEntry: InstalledMcpEntry = {
+      name: 'context7-local',
+      scope: 'local',
+    };
+
+    await act(async () => {
+      root.render(
+        React.createElement(McpServerDetailDialog, {
+          server: makeServer(),
+          isInstalled: true,
+          installedEntry,
+          installedEntries: [installedEntry],
+          diagnostic: null,
+          diagnosticsLoading: false,
+          projectPath,
+          open: true,
+          onClose: vi.fn(),
+        })
+      );
+      await Promise.resolve();
+    });
+
+    const uninstallButton = host.querySelector('[data-testid="install-button"]') as HTMLButtonElement;
+    await act(async () => {
+      uninstallButton.click();
+      await Promise.resolve();
+    });
+
+    expect(storeState.uninstallMcpServer).toHaveBeenCalledWith(
+      'io.github.upstash/context7',
+      'context7-local',
+      'local',
+      projectPath
+    );
+
+    await act(async () => {
+      root.render(
+        React.createElement(McpServerDetailDialog, {
+          server: makeServer(),
+          isInstalled: false,
+          installedEntry: null,
+          installedEntries: [],
+          diagnostic: null,
+          diagnosticsLoading: false,
+          projectPath,
+          open: true,
+          onClose: vi.fn(),
+        })
+      );
+      await Promise.resolve();
+    });
+
+    const scopeSelect = host.querySelector('[data-testid="scope-select"]') as HTMLSelectElement;
+    await act(async () => {
+      scopeSelect.value = 'local';
+      scopeSelect.dispatchEvent(new Event('change', { bubbles: true }));
+      await Promise.resolve();
+    });
+
+    const installButton = host.querySelector('[data-testid="install-button"]') as HTMLButtonElement;
+    await act(async () => {
+      installButton.click();
+      await Promise.resolve();
+    });
+
+    expect(storeState.installMcpServer).toHaveBeenCalledWith(
+      expect.objectContaining({
+        registryId: 'io.github.upstash/context7',
+        scope: 'local',
+        projectPath,
+      })
+    );
+
+    await act(async () => {
+      root.unmount();
+      await Promise.resolve();
+    });
+  });
+
   it('uses selected scope instead of aggregated installed state', async () => {
     const host = document.createElement('div');
     document.body.appendChild(host);