diff --git a/packages/pi-coding-agent/src/modes/interactive/controllers/chat-controller.test.ts b/packages/pi-coding-agent/src/modes/interactive/controllers/chat-controller.test.ts
new file mode 100644
index 000000000..d667af20d
--- /dev/null
+++ b/packages/pi-coding-agent/src/modes/interactive/controllers/chat-controller.test.ts
@@ -0,0 +1,71 @@
+import assert from "node:assert/strict";
+import test from "node:test";
+
+import { findLatestPinnableText } from "./chat-controller.js";
+
+test("findLatestPinnableText: empty content returns empty string", () => {
+	assert.equal(findLatestPinnableText([]), "");
+});
+
+test("findLatestPinnableText: no tool calls returns empty string", () => {
+	const blocks = [
+		{ type: "text", text: "hello" },
+		{ type: "text", text: "world" },
+	];
+	assert.equal(findLatestPinnableText(blocks), "");
+});
+
+test("findLatestPinnableText: returns text preceding a tool call", () => {
+	const blocks = [
+		{ type: "text", text: "doing the thing" },
+		{ type: "toolCall", id: "1", name: "Read" },
+	];
+	assert.equal(findLatestPinnableText(blocks), "doing the thing");
+});
+
+test("findLatestPinnableText: ignores trailing streaming text after the last tool call (regression: pinned mirror duplicated chat-container tokens)", () => {
+	const blocks = [
+		{ type: "text", text: "first prose" },
+		{ type: "toolCall", id: "1", name: "Read" },
+		{ type: "text", text: "second prose still streaming" },
+	];
+	assert.equal(findLatestPinnableText(blocks), "first prose");
+});
+
+test("findLatestPinnableText: with multiple tools, picks text before the most recent tool call", () => {
+	const blocks = [
+		{ type: "text", text: "first" },
+		{ type: "toolCall", id: "1", name: "Read" },
+		{ type: "text", text: "second" },
+		{ type: "toolCall", id: "2", name: "Grep" },
+		{ type: "text", text: "third streaming" },
+	];
+	assert.equal(findLatestPinnableText(blocks), "second");
+});
+
+test("findLatestPinnableText: treats serverToolUse the same as toolCall", () => {
+	const blocks = [
+		{ type: "text", text: "before web search" },
+		{ type: "serverToolUse", id: "ws1", name: "web_search" },
+		{ type: "text", text: "answer streaming" },
+	];
+	assert.equal(findLatestPinnableText(blocks), "before web search");
+});
+
+test("findLatestPinnableText: skips empty/whitespace-only text blocks", () => {
+	const blocks = [
+		{ type: "text", text: "real prose" },
+		{ type: "text", text: "   " },
+		{ type: "text", text: "" },
+		{ type: "toolCall", id: "1", name: "Read" },
+	];
+	assert.equal(findLatestPinnableText(blocks), "real prose");
+});
+
+test("findLatestPinnableText: thinking blocks are not pinnable", () => {
+	const blocks = [
+		{ type: "thinking", thinking: "internal" },
+		{ type: "toolCall", id: "1", name: "Read" },
+	];
+	assert.equal(findLatestPinnableText(blocks), "");
+});
diff --git a/packages/pi-coding-agent/src/modes/interactive/controllers/chat-controller.ts b/packages/pi-coding-agent/src/modes/interactive/controllers/chat-controller.ts
index 2c79fbd58..1fe373f20 100644
--- a/packages/pi-coding-agent/src/modes/interactive/controllers/chat-controller.ts
+++ b/packages/pi-coding-agent/src/modes/interactive/controllers/chat-controller.ts
@@ -22,6 +22,28 @@ function hasAssistantToolBlocks(message: { content: Array<any> }): boolean {
 	return message.content.some((c) => c.type === "toolCall" || c.type === "serverToolUse");
 }
 
+// Pick the latest non-empty text block that appears strictly before the most
+// recent tool call. Text blocks that come after the last tool call are still
+// streaming live into the chat container, so mirroring them into the pinned
+// "Latest Output" zone would render the same tokens twice.
+export function findLatestPinnableText(contentBlocks: Array<any>): string {
+	let lastToolIdx = -1;
+	for (let i = contentBlocks.length - 1; i >= 0; i--) {
+		const c = contentBlocks[i];
+		if (c?.type === "toolCall" || c?.type === "serverToolUse") {
+			lastToolIdx = i;
+			break;
+		}
+	}
+	for (let i = lastToolIdx - 1; i >= 0; i--) {
+		const c = contentBlocks[i];
+		if (c?.type === "text" && typeof c.text === "string" && c.text.trim()) {
+			return c.text.trim();
+		}
+	}
+	return "";
+}
+
 // Tracks the latest assistant text for the pinned message zone
 let lastPinnedText = "";
 // Whether any tool execution has been added in this assistant turn (triggers pinned display)
@@ -286,15 +308,7 @@ export async function handleAgentEvent(host: InteractiveModeStateHost & {
 				if (hasTools) hasToolsInTurn = true;
 
 				if (hasToolsInTurn) {
-					// Collect the latest text block(s) from the assistant message
-					let latestText = "";
-					for (let i = contentBlocks.length - 1; i >= 0; i--) {
-						const c = contentBlocks[i] as any;
-						if (c.type === "text" && c.text?.trim()) {
-							latestText = c.text.trim();
-							break;
-						}
-					}
+					const latestText = findLatestPinnableText(contentBlocks);
 
 					if (latestText && latestText !== lastPinnedText) {
 						lastPinnedText = latestText;