diff --git a/frontend/src/lib/components/copilot/chat/AIChatManager.test.ts b/frontend/src/lib/components/copilot/chat/AIChatManager.test.ts
index 19d432bd37..d8056e778f 100644
--- a/frontend/src/lib/components/copilot/chat/AIChatManager.test.ts
+++ b/frontend/src/lib/components/copilot/chat/AIChatManager.test.ts
@@ -330,6 +330,54 @@ describe('AIChatManager run form', () => {
 		})
 	})
 
+	// Only a deployed item has a page with a form to confirm on: a test run executes the
+	// draft being written, and a chat-enabled flow's page is a conversation. Routing either
+	// there would park the call on a page that can never answer it.
+	it('hands a deployed run to a page already open, and nothing else', async () => {
+		const manager = new AIChatManager()
+		const routed: any[] = []
+		manager.openRunOnDeployedPage = (a) => {
+			routed.push(a)
+			return true
+		}
+
+		void manager.requestRunArgs('call_run', {
+			path: 'f/a/b',
+			kind: 'run',
+			runnableKind: 'flow',
+			summary: 'Plain flow',
+			schema: {},
+			args: {}
+		})
+		void manager.requestRunArgs('call_test', {
+			path: 'f/a/b',
+			kind: 'test',
+			schema: {},
+			args: {}
+		})
+		void manager.requestRunArgs('call_chat', {
+			path: 'f/a/c',
+			kind: 'run',
+			conversational: true,
+			schema: {},
+			args: {}
+		})
+
+		expect(routed).toEqual([
+			{
+				toolCallId: 'call_run',
+				kind: 'flow',
+				path: 'f/a/b',
+				summary: 'Plain flow',
+				carries: true,
+				// Never opens a tab of its own: the reader did not ask for one here.
+				onlyIfAlreadyOpen: true
+			}
+		])
+		// Routed after the form is installed, so the page finds the call the moment it mounts.
+		expect(manager.isRunFormPending('call_run')).toBe(true)
+	})
+
 	// Stopping the turn is the form's other way out, and it settles cards through
 	// settledToolDisplay rather than through #settleRunForm.
 	it('settles a stopped form on what it held too', () => {
diff --git a/frontend/src/lib/components/sessions/sessionRuntime.svelte.ts b/frontend/src/lib/components/sessions/sessionRuntime.svelte.ts
index 55c2fad668..08c710f9cc 100644
--- a/frontend/src/lib/components/sessions/sessionRuntime.svelte.ts
+++ b/frontend/src/lib/components/sessions/sessionRuntime.svelte.ts
@@ -614,7 +614,11 @@ function createRuntime(session: Session): SessionRuntime {
 				return manager.pendingRunFormArgs(toolCallId) ?? {}
 			},
 			adopt: (jobId, args, schema) => manager.handleRunFormJob(toolCallId, jobId, args, schema),
-			decline: () => manager.handleRunFormCancel(toolCallId)
+			decline: () => manager.handleRunFormCancel(toolCallId),
+			// The same claim the card's own form takes, so the two surfaces of one call cannot
+			// both be mid-submit.
+			beginSubmit: () => manager.beginRunFormSubmit(toolCallId),
+			endSubmit: () => manager.endRunFormSubmit(toolCallId)
 		}
 	}
 
@@ -662,12 +666,22 @@ function createRuntime(session: Session): SessionRuntime {
 			return slot.kind === 'viewer' && slot.viewerKind === kind && slot.path === path
 		})
 		if (open) {
+			// A tab pinned to a version is one the reader put somewhere deliberately, and
+			// `navigate` below rebuilds its url without the pin. Worth it when the reader asked
+			// for this page; not worth silently moving them off a version they chose, so an
+			// unasked-for hand-off declines and leaves the call on the card.
+			if (onlyIfAlreadyOpen && new URL(open.url, 'http://x').searchParams.get('version')) {
+				return false
+			}
 			previewTabs.navigate(viewTarget, open.id)
 			// `navigate` re-points a tab in place and nothing more, while the call is about to
 			// tell the reader the page is open. `open` would have brought it forward and shown
-			// the panel; this path has to do both itself.
-			previewTabs.select(open.id)
-			previewTabs.setCollapsed(false)
+			// the panel; this path has to do both itself — except when nobody asked, where
+			// taking the panel off the tab the reader is on is the thing to avoid.
+			if (!onlyIfAlreadyOpen || previewTabs.activeId === open.id) {
+				previewTabs.select(open.id)
+				previewTabs.setCollapsed(false)
+			}
 		} else {
 			// Only the item's own page carries a form for this call, so a caller routing a call
 			// that was not asked to open anything gets a no rather than a new tab.