diff --git a/packages/ui/src/components/chat/composer/ui/ComposerAttachmentControls.tsx b/packages/ui/src/components/chat/composer/ui/ComposerAttachmentControls.tsx
index 85788b5b..2387ccb9 100644
--- a/packages/ui/src/components/chat/composer/ui/ComposerAttachmentControls.tsx
+++ b/packages/ui/src/components/chat/composer/ui/ComposerAttachmentControls.tsx
@@ -18,6 +18,7 @@ import {
 } from '@/components/ui/dropdown-menu';
 import { useI18n } from '@/lib/i18n';
 import { cn } from '@/lib/utils';
+import type { GitProvider } from '@/lib/gitProvider';
 
 type ComposerAttachmentControlsProps = {
     isVSCode: boolean;
@@ -26,6 +27,8 @@ type ComposerAttachmentControlsProps = {
     handlePickLocalFiles: () => void;
     openIssuePicker: () => void;
     openPrPicker: () => void;
+    /** Only shows the GitHub issue/PR attach actions when the repo is GitHub. */
+    gitProvider?: GitProvider | null;
     onOpenSettings?: () => void;
     onMenuOpenChange?: (open: boolean) => void;
     /** Mobile: open the attachment bottom sheet instead of the dropdown menu. */
@@ -41,6 +44,7 @@ export const ComposerAttachmentControls = React.memo(function ComposerAttachment
         handlePickLocalFiles,
         openIssuePicker,
         openPrPicker,
+        gitProvider,
         onOpenSettings,
     } = props;
 
@@ -98,22 +102,26 @@ export const ComposerAttachmentControls = React.memo(function ComposerAttachment
                                 <Icon name="attachment-2"/>
                                 {t('chat.chatInput.actions.attachFiles')}
                             </DropdownMenuItem>
-                            <DropdownMenuItem
-                                onSelect={() => {
-                                    requestAnimationFrame(openIssuePicker);
-                                }}
-                            >
-                                <Icon name="github"/>
-                                {t('chat.chatInput.actions.linkGithubIssue')}
-                            </DropdownMenuItem>
-                            <DropdownMenuItem
-                                onSelect={() => {
-                                    requestAnimationFrame(openPrPicker);
-                                }}
-                            >
-                                <Icon name="git-pull-request"/>
-                                {t('chat.chatInput.actions.linkGithubPr')}
-                            </DropdownMenuItem>
+                            {gitProvider === 'github' ? (
+                                <>
+                                    <DropdownMenuItem
+                                        onSelect={() => {
+                                            requestAnimationFrame(openIssuePicker);
+                                        }}
+                                    >
+                                        <Icon name="github"/>
+                                        {t('chat.chatInput.actions.linkGithubIssue')}
+                                    </DropdownMenuItem>
+                                    <DropdownMenuItem
+                                        onSelect={() => {
+                                            requestAnimationFrame(openPrPicker);
+                                        }}
+                                    >
+                                        <Icon name="git-pull-request"/>
+                                        {t('chat.chatInput.actions.linkGithubPr')}
+                                    </DropdownMenuItem>
+                                </>
+                            ) : null}
                         </DropdownMenuContent>
                     </DropdownMenu>
                 )}
@@ -136,6 +144,7 @@ export const ComposerAttachmentControls = React.memo(function ComposerAttachment
     prev.isVSCode === next.isVSCode
     && prev.footerIconButtonClass === next.footerIconButtonClass
     && prev.iconSizeClass === next.iconSizeClass
+    && prev.gitProvider === next.gitProvider
     && prev.onOpenSettings === next.onOpenSettings
     && prev.onMenuOpenChange === next.onMenuOpenChange
     && prev.onOpenMobileSheet === next.onOpenMobileSheet
diff --git a/packages/ui/src/components/chat/composer/ui/ComposerFooter.tsx b/packages/ui/src/components/chat/composer/ui/ComposerFooter.tsx
index cc52fdc9..e633475d 100644
--- a/packages/ui/src/components/chat/composer/ui/ComposerFooter.tsx
+++ b/packages/ui/src/components/chat/composer/ui/ComposerFooter.tsx
@@ -18,6 +18,7 @@ import { ComposerDictation } from '@/components/dictation/ComposerDictation';
 import { Icon } from '@/components/icon/Icon';
 import { useI18n } from '@/lib/i18n';
 import { cn } from '@/lib/utils';
+import { useGitProvider } from '@/lib/gitProvider';
 import { ModelControls } from '../../ModelControls';
 import { ComposerActionButtons } from './ComposerActionButtons';
 import { ComposerAttachmentControls } from './ComposerAttachmentControls';
@@ -106,6 +107,8 @@ export function ComposerFooter(props: ComposerFooterProps) {
         onDictationContentHeightChange,
     } = props;
 
+    const gitProvider = useGitProvider(directory);
+
     return (
         <div
             className={cn(
@@ -130,6 +133,7 @@ export function ComposerFooter(props: ComposerFooterProps) {
                                 handlePickLocalFiles={onPickLocalFiles}
                                 openIssuePicker={onOpenIssuePicker}
                                 openPrPicker={onOpenPrPicker}
+                                gitProvider={gitProvider}
                                 onOpenSettings={onOpenSettings}
                                 onOpenMobileSheet={onOpenAttachSheet}
                             />
@@ -199,6 +203,7 @@ export function ComposerFooter(props: ComposerFooterProps) {
                             handlePickLocalFiles={onPickLocalFiles}
                             openIssuePicker={onOpenIssuePicker}
                             openPrPicker={onOpenPrPicker}
+                            gitProvider={gitProvider}
                             onOpenSettings={onOpenSettings}
                         />
                         <FocusModeButton
diff --git a/packages/ui/src/components/chat/composer/ui/MobilePillComposer.tsx b/packages/ui/src/components/chat/composer/ui/MobilePillComposer.tsx
index 831efacb..4078e8ff 100644
--- a/packages/ui/src/components/chat/composer/ui/MobilePillComposer.tsx
+++ b/packages/ui/src/components/chat/composer/ui/MobilePillComposer.tsx
@@ -17,6 +17,7 @@ import { SessionGoalRow } from '@/components/chat/SessionGoalRow';
 import { SessionSuggestionChip } from '@/components/chat/SessionSuggestionChip';
 import { useI18n } from '@/lib/i18n';
 import { cn } from '@/lib/utils';
+import { useGitProvider } from '@/lib/gitProvider';
 import type { Theme } from '@/types/theme';
 import { ComposerAttachmentControls } from './ComposerAttachmentControls';
 
@@ -68,6 +69,8 @@ export function MobilePillComposer(props: MobilePillComposerProps) {
         onAbort,
     } = props;
 
+    const gitProvider = useGitProvider(directory);
+
     return (
         <div className="flex flex-col">
         <SessionGoalRow
@@ -94,6 +97,7 @@ export function MobilePillComposer(props: MobilePillComposerProps) {
                     handlePickLocalFiles={onPickLocalFiles}
                     openIssuePicker={onOpenIssuePicker}
                     openPrPicker={onOpenPrPicker}
+                    gitProvider={gitProvider}
                     onOpenMobileSheet={onOpenAttachSheet}
                 />
                 <button
diff --git a/packages/ui/src/components/layout/ContextPanel.tsx b/packages/ui/src/components/layout/ContextPanel.tsx
index efdb91eb..dcd9240a 100644
--- a/packages/ui/src/components/layout/ContextPanel.tsx
+++ b/packages/ui/src/components/layout/ContextPanel.tsx
@@ -23,6 +23,7 @@ import { useEffectiveDirectory } from '@/hooks/useEffectiveDirectory';
 import { cn } from '@/lib/utils';
 import { useI18n } from '@/lib/i18n';
 import { useBrowserFaviconStore } from '@/stores/useBrowserFaviconStore';
+import { useGitProvider } from '@/lib/gitProvider';
 import { useFilesViewTabsStore } from '@/stores/useFilesViewTabsStore';
 import { useUIStore, type ContextPanelMode, type PendingDiffScope } from '@/stores/useUIStore';
 import { markSessionViewed } from '@/sync/notification-store';
@@ -440,6 +441,7 @@ export const ContextPanel: React.FC = () => {
   const { t } = useI18n();
   const effectiveDirectory = useEffectiveDirectory() ?? '';
   const directoryKey = React.useMemo(() => normalizeDirectoryKey(effectiveDirectory), [effectiveDirectory]);
+  const gitProvider = useGitProvider(effectiveDirectory);
 
   const panelState = useUIStore((state) => (directoryKey ? state.contextPanelByDirectory[directoryKey] : undefined));
   const closeContextPanel = useUIStore((state) => state.closeContextPanel);
@@ -936,7 +938,7 @@ export const ContextPanel: React.FC = () => {
         : activeTab?.mode === 'git'
             ? <React.Suspense fallback={null}><GitView isActive={isOpen} /></React.Suspense>
             : activeTab?.mode === 'pr'
-                ? <PullRequestView />
+                ? (gitProvider === 'github' ? <PullRequestView /> : null)
             : activeTab?.mode === 'notes'
                 ? <ProjectContextPanel />
         : activeTab?.mode === 'plan'
diff --git a/packages/ui/src/components/session/NewWorktreeDialog.tsx b/packages/ui/src/components/session/NewWorktreeDialog.tsx
index 1a4cbfee..44a6e108 100644
--- a/packages/ui/src/components/session/NewWorktreeDialog.tsx
+++ b/packages/ui/src/components/session/NewWorktreeDialog.tsx
@@ -33,6 +33,7 @@ import { useSessionUIStore } from '@/sync/session-ui-store';
 import { useSelectionStore } from '@/sync/selection-store';
 import * as sessionActions from '@/sync/session-actions';
 import { buildLinkedIssue } from '@/lib/linkedIssues';
+import { useGitProvider } from '@/lib/gitProvider';
 import { useConfigStore } from '@/stores/useConfigStore';
 import { validateWorktreeCreate, createWorktree } from '@/lib/worktrees/worktreeManager';
 import { withWorktreeUpstreamDefaults } from '@/lib/worktrees/worktreeCreate';
@@ -1307,6 +1308,13 @@ export function NewWorktreeDialog({
   // GitLab connection check
   const isGitLabConnected = gitlabAuthChecked && gitlabAuthStatus?.connected === true;
 
+  // Only offer the provider's start-from flow when the repo actually belongs
+  // to that provider: a GitLab repo must not surface the GitHub picker and
+  // vice versa.
+  const gitProvider = useGitProvider(projectDirectory);
+  const showGitHubStartFrom = isGitHubConnected && gitProvider === 'github';
+  const showGitLabStartFrom = isGitLabConnected && gitProvider === 'gitlab';
+
   // Check if form is valid for submission
   const isFormValid = mode === 'existing-branch'
     ? !!existingBranchState.selectedBranch && !!existingBranchState.worktreeName && !validation.branchError && !validation.worktreeError
@@ -1557,9 +1565,9 @@ export function NewWorktreeDialog({
                   <label className="typography-ui-label text-foreground block font-semibold">
                     {t('session.newWorktree.branchName')}
                   </label>
-                  {mode === 'new-branch' && (isGitHubConnected || isGitLabConnected) && (
+                  {mode === 'new-branch' && (showGitHubStartFrom || showGitLabStartFrom) && (
                     <div className="flex items-center gap-2 flex-wrap">
-                      {isGitHubConnected && (
+                      {showGitHubStartFrom && (
                         <Button
                           variant="outline"
                           size="sm"
@@ -1570,7 +1578,7 @@ export function NewWorktreeDialog({
                             {newBranchState.linkedIssue || newBranchState.linkedPr ? t('session.newWorktree.actions.change') : t('session.newWorktree.actions.startFromGitHubIssuePr')}
                         </Button>
                       )}
-                      {isGitLabConnected && (
+                      {showGitLabStartFrom && (
                         <Button
                           variant="outline"
                           size="sm"
@@ -2085,9 +2093,9 @@ export function NewWorktreeDialog({
                     <label className="typography-ui-label text-foreground block font-semibold">
                       {t('session.newWorktree.branchName')}
                     </label>
-                    {mode === 'new-branch' && (isGitHubConnected || isGitLabConnected) && (
+                    {mode === 'new-branch' && (showGitHubStartFrom || showGitLabStartFrom) && (
                       <div className="flex items-center gap-2 flex-wrap">
-                        {isGitHubConnected && (
+                        {showGitHubStartFrom && (
                           <Button
                             variant="outline"
                             size="sm"
@@ -2098,7 +2106,7 @@ export function NewWorktreeDialog({
                           {newBranchState.linkedIssue || newBranchState.linkedPr ? t('session.newWorktree.actions.change') : t('session.newWorktree.actions.startFromGitHubIssuePr')}
                           </Button>
                         )}
-                        {isGitLabConnected && (
+                        {showGitLabStartFrom && (
                           <Button
                             variant="outline"
                             size="sm"
diff --git a/packages/ui/src/components/views/walkthrough/WalkthroughView.tsx b/packages/ui/src/components/views/walkthrough/WalkthroughView.tsx
index 51b20387..2882af7e 100644
--- a/packages/ui/src/components/views/walkthrough/WalkthroughView.tsx
+++ b/packages/ui/src/components/views/walkthrough/WalkthroughView.tsx
@@ -13,6 +13,7 @@ import {
 import { Tooltip, TooltipContent, TooltipTrigger } from '@/components/ui/tooltip';
 import { useI18n, type Locale } from '@/lib/i18n';
 import { openExternalUrl } from '@/lib/url';
+import { useGitProvider } from '@/lib/gitProvider';
 import { buildWalkthroughView } from '@/lib/walkthrough/model';
 import type { WalkthroughSource, WalkthroughWorkingTreeScope } from '@/lib/walkthrough/types';
 import { ModelSelector } from '@/components/sections/agents/ModelSelector';
@@ -208,9 +209,10 @@ export const WalkthroughView = ({ directory }: WalkthroughViewProps) => {
   const ensurePrStatusEntry = useGitHubPrStatusStore((state) => state.ensureEntry);
   const setPrStatusParams = useGitHubPrStatusStore((state) => state.setParams);
   const refreshPrStatusTargets = useGitHubPrStatusStore((state) => state.refreshTargets);
+  const gitProvider = useGitProvider(directory);
 
   useEffect(() => {
-    if (!directory || !currentBranch || !githubAuthChecked || !githubConnected) return;
+    if (!directory || !currentBranch || !githubAuthChecked || !githubConnected || gitProvider !== 'github') return;
     const key = getGitHubPrStatusKey(directory, currentBranch);
     ensurePrStatusEntry(key);
     setPrStatusParams(key, {
@@ -230,6 +232,7 @@ export const WalkthroughView = ({ directory }: WalkthroughViewProps) => {
     github,
     githubAuthChecked,
     githubConnected,
+    gitProvider,
     refreshPrStatusTargets,
     setPrStatusParams,
   ]);
diff --git a/packages/ui/src/lib/gitProvider.test.ts b/packages/ui/src/lib/gitProvider.test.ts
new file mode 100644
index 00000000..5fa9d459
--- /dev/null
+++ b/packages/ui/src/lib/gitProvider.test.ts
@@ -0,0 +1,45 @@
+import { describe, expect, test } from 'bun:test';
+import { detectGitProvider } from './gitProvider';
+
+describe('detectGitProvider', () => {
+  test('returns null with no remotes', () => {
+    expect(detectGitProvider([], [])).toBeNull();
+  });
+
+  test('classifies github.com remotes across URL forms', () => {
+    expect(detectGitProvider(['git@github.com:owner/repo.git'], [])).toBe('github');
+    expect(detectGitProvider(['ssh://git@github.com/owner/repo.git'], [])).toBe('github');
+    expect(detectGitProvider(['https://github.com/owner/repo.git'], [])).toBe('github');
+  });
+
+  test('classifies gitlab.com remotes across URL forms', () => {
+    expect(detectGitProvider(['git@gitlab.com:group/project.git'], [])).toBe('gitlab');
+    expect(detectGitProvider(['ssh://git@gitlab.com/group/sub/project.git'], [])).toBe('gitlab');
+    expect(detectGitProvider(['https://gitlab.com/group/project'], [])).toBe('gitlab');
+  });
+
+  test('classifies a self-hosted GitLab remote through connected account hosts', () => {
+    expect(detectGitProvider(['git@git.example.com:group/project.git'], ['https://git.example.com'])).toBe('gitlab');
+    expect(detectGitProvider(['https://git.example.com/group/project.git'], ['https://git.example.com'])).toBe('gitlab');
+  });
+
+  test('does not classify an unknown self-hosted host as gitlab without an account', () => {
+    expect(detectGitProvider(['git@git.example.com:group/project.git'], [])).toBe('other');
+  });
+
+  test('classifies other hosts as other', () => {
+    expect(detectGitProvider(['git@gitea.example.com:owner/repo.git'], [])).toBe('other');
+    expect(detectGitProvider(['https://bitbucket.org/owner/repo.git'], [])).toBe('other');
+  });
+
+  test('github wins when both github and gitlab remotes are present', () => {
+    expect(detectGitProvider([
+      'git@github.com:owner/repo.git',
+      'git@gitlab.com:owner/repo.git',
+    ], [])).toBe('github');
+  });
+
+  test('ignores malformed remotes', () => {
+    expect(detectGitProvider(['', 'not a url', '   '], [])).toBeNull();
+  });
+});
diff --git a/packages/ui/src/lib/gitProvider.ts b/packages/ui/src/lib/gitProvider.ts
new file mode 100644
index 00000000..1cd0b63e
--- /dev/null
+++ b/packages/ui/src/lib/gitProvider.ts
@@ -0,0 +1,124 @@
+import { useEffect, useMemo, useState } from 'react';
+import { getRemotes } from '@/lib/gitApi';
+import { useGitLabAuthStore } from '@/stores/useGitLabAuthStore';
+
+export type GitProvider = 'github' | 'gitlab' | 'other';
+
+const parseGitRemoteHost = (value: string): string | null => {
+  const url = value.trim();
+  if (!url) {
+    return null;
+  }
+  // scp-like form: git@host:owner/repo.git
+  const at = url.indexOf('@');
+  if (at >= 0) {
+    const rest = url.slice(at + 1);
+    const colon = rest.indexOf(':');
+    if (colon > 0 && !rest.slice(0, colon).includes('/')) {
+      return rest.slice(0, colon).toLowerCase();
+    }
+  }
+  try {
+    const parsed = new URL(url.includes('://') ? url : `ssh://${url}`);
+    return parsed.hostname.toLowerCase();
+  } catch {
+    return null;
+  }
+};
+
+const normalizeGitLabHost = (baseUrl: string | undefined): string | null => {
+  if (!baseUrl) {
+    return null;
+  }
+  try {
+    return new URL(baseUrl).hostname.toLowerCase();
+  } catch {
+    return null;
+  }
+};
+
+/**
+ * Classify a repository by the hosts of its remotes. Returns null when there
+ * are no remotes to inspect. GitHub wins on `github.com`; a remote is treated
+ * as GitLab when it is `gitlab.com` or matches a connected GitLab instance
+ * base URL (self-hosted). Anything else resolves to 'other' so GitHub-branded
+ * UI is not offered for non-GitHub repositories.
+ */
+export const detectGitProvider = (fetchUrls: string[], gitlabHosts: string[]): GitProvider | null => {
+  const hosts = new Set<string>();
+  for (const url of fetchUrls) {
+    const host = parseGitRemoteHost(url);
+    if (host) {
+      hosts.add(host);
+    }
+  }
+  if (hosts.size === 0) {
+    return null;
+  }
+  if (hosts.has('github.com')) {
+    return 'github';
+  }
+  const gitlabHostsSet = new Set([
+    'gitlab.com',
+    ...gitlabHosts.map(normalizeGitLabHost).filter((host): host is string => Boolean(host)),
+  ]);
+  for (const host of hosts) {
+    if (gitlabHostsSet.has(host)) {
+      return 'gitlab';
+    }
+  }
+  return 'other';
+};
+
+const RESOLVE_CACHE_TTL_MS = 60_000;
+const resolveCache = new Map<string, { at: number; provider: GitProvider | null }>();
+
+export const resolveGitProvider = async (directory: string, gitlabHosts: string[]): Promise<GitProvider | null> => {
+  const cached = resolveCache.get(directory);
+  if (cached && Date.now() - cached.at < RESOLVE_CACHE_TTL_MS) {
+    return cached.provider;
+  }
+  let provider: GitProvider | null = null;
+  try {
+    const remotes = await getRemotes(directory);
+    provider = detectGitProvider(remotes.map((remote) => remote.fetchUrl), gitlabHosts);
+  } catch {
+    provider = null;
+  }
+  resolveCache.set(directory, { at: Date.now(), provider });
+  return provider;
+};
+
+/**
+ * Resolve the git provider (github | gitlab | other) of a working directory.
+ * Self-hosted GitLab instances are recognized through the connected GitLab
+ * accounts' base URLs, so the classification stays null/'other' (never
+ * 'github') when no account is known yet — GitHub UI must not leak into a
+ * GitLab repo regardless of auth state.
+ */
+export const useGitProvider = (directory: string | null | undefined): GitProvider | null => {
+  const gitlabAccounts = useGitLabAuthStore((state) => state.status?.accounts);
+  const gitlabHosts = useMemo(
+    () => (gitlabAccounts ?? []).map((account) => account.baseUrl),
+    [gitlabAccounts],
+  );
+  const [provider, setProvider] = useState<GitProvider | null>(null);
+
+  useEffect(() => {
+    if (!directory) {
+      setProvider(null);
+      return;
+    }
+    let cancelled = false;
+    void resolveGitProvider(directory, gitlabHosts).then((resolved) => {
+      if (!cancelled) {
+        setProvider(resolved);
+      }
+    });
+    return () => {
+      cancelled = true;
+    };
+  }, [directory, gitlabHosts]);
+
+  return provider;
+};