diff --git a/CHANGELOG.md b/CHANGELOG.md
index f6350be7ffb..e2b39d81d82 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -357,6 +357,7 @@ Docs: https://docs.openclaw.ai
 - Agents/failover: rotate auth profiles before deferred cooldown marking on rate-limit failures, so file-lock contention cannot stall profile failover. Fixes #57281. (#57283) Thanks @jeremyknows.
 - Gateway/sessions: when `session.dmScope: "main"` is configured, route a bare webchat `/new` against the agent's main session (`sessions.create` with `emitCommandHooks=true`) to an in-place reset instead of creating a parallel `dashboard:` child, matching `/new` behavior on Telegram/Discord. Fixes #77434. (#71170) Thanks @statxc.
 - Scripts/UI/Windows: launch `.cmd` and `.bat` UI runners through the shared cmd.exe escaping path with shell mode disabled, avoiding Node.js v24 DEP0190 warnings while preserving argument boundaries. (#62910) Thanks @nandanadileep.
+- Agents/CLI runner: disable supervisor stdout/stderr capture for prepared CLI runs while keeping bounded diagnostics and incremental JSONL output parsing, preventing long CLI output from being retained in memory. (#79617) Thanks @samzong.
 - Telegram: treat a DM binding that carries the chat id in both `conversationId` and `parentConversationId` as a direct conversation instead of a topic, so reverse delivery for Telegram DMs is not misrouted through a topic-shaped target. (#79700) Thanks @TSHOGX.
 
 ## 2026.5.7
diff --git a/src/agents/cli-runner.spawn.test.ts b/src/agents/cli-runner.spawn.test.ts
index 4a9e3129884..6d4b8d23890 100644
--- a/src/agents/cli-runner.spawn.test.ts
+++ b/src/agents/cli-runner.spawn.test.ts
@@ -768,27 +768,19 @@ describe("runCliAgent spawn path", () => {
           event: { type: "content_block_delta", delta: { type: "text_delta", text: " world" } },
         }) + "\n",
       );
+      input.onStdout?.(
+        JSON.stringify({
+          type: "result",
+          session_id: "session-123",
+          result: "Hello world",
+        }) + "\n",
+      );
       return createManagedRun({
         reason: "exit",
         exitCode: 0,
         exitSignal: null,
         durationMs: 50,
-        stdout: [
-          JSON.stringify({ type: "init", session_id: "session-123" }),
-          JSON.stringify({
-            type: "stream_event",
-            event: { type: "content_block_delta", delta: { type: "text_delta", text: "Hello" } },
-          }),
-          JSON.stringify({
-            type: "stream_event",
-            event: { type: "content_block_delta", delta: { type: "text_delta", text: " world" } },
-          }),
-          JSON.stringify({
-            type: "result",
-            session_id: "session-123",
-            result: "Hello world",
-          }),
-        ].join("\n"),
+        stdout: "",
         stderr: "",
         timedOut: false,
         noOutputTimedOut: false,
diff --git a/src/agents/cli-runner/execute.supervisor-capture.test.ts b/src/agents/cli-runner/execute.supervisor-capture.test.ts
index bd302267f34..2c0ccc94452 100644
--- a/src/agents/cli-runner/execute.supervisor-capture.test.ts
+++ b/src/agents/cli-runner/execute.supervisor-capture.test.ts
@@ -150,6 +150,52 @@ describe("executePreparedCliRun supervisor output capture", () => {
     expect(result.sessionId).toBe("session-jsonl-large");
   });
 
+  it("parses oversized resume JSONL output from the effective resume output mode", async () => {
+    const largeToolEvent = `${JSON.stringify({
+      type: "stream_event",
+      event: {
+        type: "content_block_delta",
+        delta: { type: "tool_delta", text: "x".repeat(2 * 1024 * 1024) },
+      },
+    })}\n`;
+    const resultEvent = `${JSON.stringify({
+      type: "result",
+      session_id: "resume-jsonl-session",
+      result: "resumed answer",
+    })}\n`;
+    const context = buildPreparedCliRunContext({
+      output: "text",
+      provider: "resume-jsonl-cli",
+    });
+    Object.assign(context.preparedBackend.backend, {
+      jsonlDialect: "claude-stream-json" as const,
+      resumeArgs: ["resume", "{sessionId}"],
+      resumeOutput: "jsonl" as const,
+      sessionMode: "existing" as const,
+    });
+
+    supervisorSpawnMock.mockImplementationOnce(async (...args: unknown[]) => {
+      const input = args[0] as SupervisorSpawnInput;
+      input.onStdout?.(largeToolEvent);
+      input.onStdout?.(resultEvent);
+      return createManagedRun({
+        reason: "exit",
+        exitCode: 0,
+        exitSignal: null,
+        durationMs: 50,
+        stdout: input.captureOutput === false ? "" : `${largeToolEvent}${resultEvent}`,
+        stderr: "",
+        timedOut: false,
+        noOutputTimedOut: false,
+      });
+    });
+
+    const result = await executePreparedCliRun(context, "resume-jsonl-session");
+
+    expect(result.text).toBe("resumed answer");
+    expect(result.sessionId).toBe("resume-jsonl-session");
+  });
+
   it("classifies failed stdout from the retained parse buffer before the diagnostic tail", async () => {
     const errorPrefix = `${JSON.stringify({
       type: "result",
diff --git a/src/agents/cli-runner/execute.ts b/src/agents/cli-runner/execute.ts
index 0f07f7949b1..777cc7c8325 100644
--- a/src/agents/cli-runner/execute.ts
+++ b/src/agents/cli-runner/execute.ts
@@ -442,7 +442,8 @@ export async function executePreparedCliRun(
           useResume,
           trigger: params.trigger,
         });
-        const hasJsonlOutput = backend.output === "jsonl";
+        const outputMode = useResume ? (backend.resumeOutput ?? backend.output) : backend.output;
+        const hasJsonlOutput = outputMode === "jsonl";
         if (shouldUseClaudeLiveSession(context)) {
           if (!hasJsonlOutput) {
             throw new Error("Claude live session requires JSONL streaming parser");
@@ -688,7 +689,6 @@ export async function executePreparedCliRun(
           });
         }
 
-        const outputMode = useResume ? (backend.resumeOutput ?? backend.output) : backend.output;
         const streamedJsonlOutput =
           outputMode === "jsonl" ? (streamingParser?.getOutput() ?? null) : null;