fix: strip leading empty lines in sanitizeUserFacingText (#16280)

* fix: strip leading empty lines in sanitizeUserFacingText (#16158) (thanks @mcinteerj)

* fix: strip leading empty lines in sanitizeUserFacingText (#16158) (thanks @mcinteerj)

* fix: strip leading empty lines in sanitizeUserFacingText (#16158) (thanks @mcinteerj)

CHANGELOG.md

@@ -56,7 +56,7 @@ Docs: https://docs.openclaw.ai
 - Security/Audit: warn when `gateway.tools.allow` re-enables default-denied tools over HTTP `POST /tools/invoke`, since this can increase RCE blast radius if the gateway is reachable.
 - Security/Plugins/Hooks: harden npm-based installs by restricting specs to registry packages only, passing `--ignore-scripts` to `npm pack`, and cleaning up temp install directories.
 - Feishu: stop persistent Typing reaction on NO_REPLY/suppressed runs by wiring reply-dispatcher cleanup to remove typing indicators. (#15464) Thanks @arosstale.
-- Agents: strip leading whitespace/newlines from `sanitizeUserFacingText` output and normalize whitespace-only outputs to empty text. (#16158) Thanks @mcinteerj.
+- Agents: strip leading empty lines from `sanitizeUserFacingText` output and normalize whitespace-only outputs to empty text. (#16158) Thanks @mcinteerj.
 - BlueBubbles: gracefully degrade when Private API is disabled by filtering private-only actions, skipping private-only reactions/reply effects, and avoiding private reply markers so non-private flows remain usable. (#16002) Thanks @L-U-C-K-Y.
 - Outbound: add a write-ahead delivery queue with crash-recovery retries to prevent lost outbound messages after gateway restarts. (#15636) Thanks @nabbilkhan, @thewilloftheshadow.
 - Auto-reply/Threading: auto-inject implicit reply threading so `replyToMode` works without requiring model-emitted `[[reply_to_current]]`, while preserving `replyToMode: "off"` behavior for implicit Slack replies and keeping block-streaming chunk coalescing stable under `replyToMode: "first"`. (#14976) Thanks @Diaspar4u.

src/agents/pi-embedded-helpers.sanitizeuserfacingtext.e2e.test.ts

@@ -77,7 +77,7 @@ describe("sanitizeUserFacingText", () => {
   });
 
   it("strips leading whitespace and newlines combined", () => {
-    expect(sanitizeUserFacingText("\n \n Hello")).toBe("Hello");
+    expect(sanitizeUserFacingText("\n \nHello")).toBe("Hello");
     expect(sanitizeUserFacingText("  \n\nHello")).toBe("Hello");
   });
 

src/agents/pi-embedded-helpers/errors.ts

@@ -527,7 +527,10 @@ export function sanitizeUserFacingText(text: string, opts?: { errorContext?: boo
     }
   }
 
-  return collapseConsecutiveDuplicateBlocks(stripped).trimStart();
+  // Strip leading blank lines (including whitespace-only lines) without clobbering indentation on
+  // the first content line (e.g. markdown/code blocks).
+  const withoutLeadingEmptyLines = stripped.replace(/^(?:[ \t]*\r?\n)+/, "");
+  return collapseConsecutiveDuplicateBlocks(withoutLeadingEmptyLines);
 }
 
 export function isRateLimitAssistantError(msg: AssistantMessage | undefined): boolean {