fix(claude): prefill continuation context for manual submission (#21912)

* fix(claude): prefill continuation context for manual submission

* fix(agents): force draft paste when inline prefill falls back

src/renderer/src/lib/launch-agent-in-new-tab-windows-quoting.test.ts

@@ -3,6 +3,9 @@
 
 import { beforeEach, describe, expect, it, vi } from 'vitest'
 
+const mockIsWebRuntimeSessionActive = vi.fn(() => false)
+const mockCreateWebRuntimeAgentSessionTerminal = vi.fn()
+const mockCreateWebRuntimeAgentSessionTerminalWithLaunchDraft = vi.fn()
 const mockCreateTab = vi.fn()
 const mockQueueTabStartupCommand = vi.fn()
 const mockPasteDraftWhenAgentReady = vi.fn()
@@ -102,13 +105,21 @@ vi.mock('@/lib/telemetry', () => ({
 
 vi.mock('@/runtime/web-runtime-session', () => ({
   createWebRuntimeSessionTerminal: vi.fn(),
-  isWebRuntimeSessionActive: vi.fn(() => false),
+  isWebRuntimeSessionActive: mockIsWebRuntimeSessionActive,
+  createWebRuntimeAgentSessionTerminal: mockCreateWebRuntimeAgentSessionTerminal,
+  createWebRuntimeAgentSessionTerminalWithLaunchDraft:
+    mockCreateWebRuntimeAgentSessionTerminalWithLaunchDraft,
   isWebTerminalSurfaceTabId: vi.fn(() => false)
 }))
 
 describe('launchAgentInNewTab Windows shell quoting', () => {
   beforeEach(() => {
     vi.clearAllMocks()
+    mockIsWebRuntimeSessionActive.mockReturnValue(false)
+    mockCreateWebRuntimeAgentSessionTerminal.mockResolvedValue({
+      outcome: { status: 'created' },
+      promptDelivered: true
+    })
     store.activeRepoId = 'repo-1'
     store.activeWorktreeId = 'wt-1'
     store.settings = {
@@ -147,6 +158,29 @@ describe('launchAgentInNewTab Windows shell quoting', () => {
     mockPasteDraftWhenAgentReady.mockResolvedValue(true)
   })
 
+  it('forces oversized Windows drafts through the paired-host paste fallback without submitting', async () => {
+    mockIsWebRuntimeSessionActive.mockReturnValue(true)
+    const { launchAgentInNewTab } = await import('./launch-agent-in-new-tab')
+    const prompt = 'x'.repeat(25_000)
+
+    launchAgentInNewTab({
+      agent: 'claude',
+      worktreeId: 'wt-1',
+      prompt,
+      promptDelivery: 'draft',
+      launchPlatform: 'win32'
+    })
+
+    expect(mockCreateWebRuntimeAgentSessionTerminal).toHaveBeenCalledWith(
+      expect.objectContaining({
+        promptAfterReady: prompt,
+        submitPrompt: false,
+        forcePromptPaste: true
+      })
+    )
+    expect(mockCreateWebRuntimeAgentSessionTerminalWithLaunchDraft).not.toHaveBeenCalled()
+  })
+
   it('uses the explicit startup shell platform when building draft launch commands', async () => {
     const { launchAgentInNewTab } = await import('./launch-agent-in-new-tab')
 

src/renderer/src/lib/launch-agent-in-new-tab.test.ts

@@ -647,7 +647,7 @@ describe('launchAgentInNewTab', () => {
         content: prompt,
         agent: 'claude',
         submit: false,
-        forcePaste: false
+        forcePaste: true
       })
     )
   })

src/renderer/src/lib/launch-agent-in-new-tab.ts

@@ -305,7 +305,7 @@ function launchAgentInNewTabInternal(args: LaunchAgentInNewTabArgs): LaunchAgent
       content: pasteDraftAfterLaunch,
       agent,
       submit: submitPastedPrompt,
-      forcePaste: promptDelivery === 'submit-after-ready',
+      forcePaste: true,
       onTimeout: timeoutNotice.onTimeout
     }).then((delivered) => {
       if (delivered) {

src/renderer/src/lib/launch-agent-session-continuation.test.ts

@@ -72,7 +72,7 @@ describe('launchAgentSessionContinuation', () => {
         worktreeId: 'wt-1',
         groupId: 'group-1',
         initialCwd: '/repo/worktree/packages/app',
-        promptDelivery: 'submit-after-ready'
+        promptDelivery: 'draft'
       })
     )
   })
@@ -129,6 +129,9 @@ describe('launchAgentSessionContinuation', () => {
       launchSource: 'sidebar'
     })
 
+    expect(launchAgentInNewTab).toHaveBeenCalledWith(
+      expect.objectContaining({ agent: 'codex', promptDelivery: 'submit-after-ready' })
+    )
     await vi.waitFor(() =>
       expect(toast.error).toHaveBeenCalledWith(
         'The new Codex session started, but its context could not be sent.'

src/renderer/src/lib/launch-agent-session-continuation.ts

@@ -90,7 +90,7 @@ export async function launchAgentSessionContinuation({
     worktreeId,
     ...(groupId ? { groupId } : {}),
     prompt,
-    promptDelivery: 'submit-after-ready',
+    promptDelivery: agent === 'claude' ? 'draft' : 'submit-after-ready',
     launchSource,
     ...(initialCwd ? { initialCwd } : {}),
     onPromptDelivered: () =>

src/renderer/src/lib/launch-agent-web-host-tab.ts

@@ -128,7 +128,7 @@ export function launchAgentInWebHostTab(args: {
       agent,
       promptAfterReady: pastePromptAfterReady,
       submitPrompt: submitPastedPrompt,
-      forcePromptPaste: promptDelivery === 'submit-after-ready'
+      forcePromptPaste: true
     }).then(handleCreation)
   }
   if (hasPrompt && promptDelivery === 'draft') {