From e624f982ed9e83f76a4daa80d2f5f62263a5ce59 Mon Sep 17 00:00:00 2001
From: YeonGyu-Kim <code.yeon.gyu@gmail.com>
Date: Mon, 16 Feb 2026 22:37:27 +0900
Subject: [PATCH] feat: auto-enable full_session, thinking, and tool_results
 for running background tasks

---
 .../background-task/create-background-output.ts  | 11 ++++++++---
 .../background-task/modules/background-output.ts | 11 ++++++++---
 src/tools/background-task/tools.test.ts          | 16 +++++++++++++++-
 3 files changed, 31 insertions(+), 7 deletions(-)

diff --git a/src/tools/background-task/create-background-output.ts b/src/tools/background-task/create-background-output.ts
index 37c0f348..f1e19850 100644
--- a/src/tools/background-task/create-background-output.ts
+++ b/src/tools/background-task/create-background-output.ts
@@ -77,12 +77,17 @@ export function createBackgroundOutput(manager: BackgroundOutputManager, client:
           storeToolMetadata(ctx.sessionID, callID, meta)
         }
 
-        if (args.full_session === true) {
+        const isActive = task.status === "pending" || task.status === "running"
+        const fullSession = args.full_session ?? isActive
+        const includeThinking = args.include_thinking ?? isActive
+        const includeToolResults = args.include_tool_results ?? isActive
+
+        if (fullSession) {
           return await formatFullSession(task, client, {
-            includeThinking: args.include_thinking === true,
+            includeThinking,
             messageLimit: args.message_limit,
             sinceMessageId: args.since_message_id,
-            includeToolResults: args.include_tool_results === true,
+            includeToolResults,
             thinkingMaxChars: args.thinking_max_chars,
           })
         }
diff --git a/src/tools/background-task/modules/background-output.ts b/src/tools/background-task/modules/background-output.ts
index 38d4d3b9..509cf252 100644
--- a/src/tools/background-task/modules/background-output.ts
+++ b/src/tools/background-task/modules/background-output.ts
@@ -77,12 +77,17 @@ export function createBackgroundOutput(manager: BackgroundOutputManager, client:
           storeToolMetadata(ctx.sessionID, callID, meta)
         }
 
-        if (args.full_session === true) {
+        const isActive = task.status === "pending" || task.status === "running"
+        const fullSession = args.full_session ?? isActive
+        const includeThinking = args.include_thinking ?? isActive
+        const includeToolResults = args.include_tool_results ?? isActive
+
+        if (fullSession) {
           return await formatFullSession(task, client, {
-            includeThinking: args.include_thinking === true,
+            includeThinking,
             messageLimit: args.message_limit,
             sinceMessageId: args.since_message_id,
-            includeToolResults: args.include_tool_results === true,
+            includeToolResults,
             thinkingMaxChars: args.thinking_max_chars,
           })
         }
diff --git a/src/tools/background-task/tools.test.ts b/src/tools/background-task/tools.test.ts
index 2f1d6502..a74b2f19 100644
--- a/src/tools/background-task/tools.test.ts
+++ b/src/tools/background-task/tools.test.ts
@@ -232,7 +232,7 @@ describe("background_output full_session", () => {
     expect(output).toContain("Has more: true")
   })
 
-  test("keeps legacy status output when full_session is false", async () => {
+  test("defaults to full_session when task is running", async () => {
     // #given
     const task = createTask({ status: "running" })
     const manager = createMockManager(task)
@@ -242,6 +242,20 @@ describe("background_output full_session", () => {
     // #when
     const output = await tool.execute({ task_id: "task-1" }, mockContext)
 
+    // #then
+    expect(output).toContain("# Full Session Output")
+  })
+
+  test("keeps legacy status output when full_session is explicitly false on running task", async () => {
+    // #given
+    const task = createTask({ status: "running" })
+    const manager = createMockManager(task)
+    const client = createMockClient({})
+    const tool = createBackgroundOutput(manager, client)
+
+    // #when
+    const output = await tool.execute({ task_id: "task-1", full_session: false }, mockContext)
+
     // #then
     expect(output).toContain("# Task Status")
     expect(output).toContain("Task ID")