From 9c401530254b764d9c7a74c992bec612f32ccd8e Mon Sep 17 00:00:00 2001
From: Adam Malczewski <github@tradam.dev>
Date: Fri, 29 May 2026 15:47:13 +0900
Subject: fix: include agent_id in foreground summon results for Open Tab
 button; preserve slider selection on agent config refresh

---
 packages/core/src/tools/summon.ts        | 12 +++++++++---
 packages/frontend/src/lib/tabs.svelte.ts | 22 +++++++++++++++-------
 2 files changed, 24 insertions(+), 10 deletions(-)

diff --git a/packages/core/src/tools/summon.ts b/packages/core/src/tools/summon.ts
index 34109f3..cf845ea 100644
--- a/packages/core/src/tools/summon.ts
+++ b/packages/core/src/tools/summon.ts
@@ -183,12 +183,18 @@ export function createSummonTool(
 				});
 
 				if (!background) {
-					// Block until the child agent completes
+					// Block until the child agent completes. Always prefix the
+					// result with `agent_id: <uuid>` so the frontend's
+					// ToolCallDisplay regex (`agent_id:\s*([a-f0-9-]+)`) can
+					// surface the "Open Tab" button for foreground summons too —
+					// not just background ones. The child's tab still exists and
+					// holds the full conversation, so the user should always be
+					// able to open it.
 					const result = await callbacks.getResult(agentId);
 					if (result.status === "done") {
-						return result.result;
+						return `agent_id: ${agentId}\n\n${result.result}`;
 					}
-					return `Error from child agent: ${result.error}`;
+					return `agent_id: ${agentId}\n\nError from child agent: ${result.error}`;
 				}
 
 				return [
diff --git a/packages/frontend/src/lib/tabs.svelte.ts b/packages/frontend/src/lib/tabs.svelte.ts
index 9d0040c..ccdd587 100644
--- a/packages/frontend/src/lib/tabs.svelte.ts
+++ b/packages/frontend/src/lib/tabs.svelte.ts
@@ -1213,17 +1213,25 @@ export function createTabStore() {
 			const agents = data.agents ?? [];
 			const freshAgent = agents.find((a) => a.slug === tab.agentSlug && a.scope === tab.agentScope);
 			if (!freshAgent) return;
-			const firstModel = freshAgent.models[0];
 			const patch: Partial<Tab> = {
 				agentModels: freshAgent.models,
 				workingDirectory: freshAgent.cwd || null,
 			};
-			if (firstModel) {
-				patch.keyId = firstModel.key_id;
-				patch.modelId = firstModel.model_id;
-			} else {
-				patch.keyId = null;
-				patch.modelId = null;
+			// Preserve the user's current selection if it still exists in the
+			// refreshed models list. Only fall back to the first model when the
+			// current selection is no longer valid.
+			const currentStillValid = freshAgent.models.some(
+				(m) => m.key_id === tab.keyId && m.model_id === tab.modelId,
+			);
+			if (!currentStillValid) {
+				const firstModel = freshAgent.models[0];
+				if (firstModel) {
+					patch.keyId = firstModel.key_id;
+					patch.modelId = firstModel.model_id;
+				} else {
+					patch.keyId = null;
+					patch.modelId = null;
+				}
 			}
 			updateTab(tabId, patch);
 		} catch {
-- 
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