fix(subagent): keep emoji / surrogate pairs intact during subagent announce log truncation

maweibin · claude · maweibin · commit 65a6c32f1c85 · 2026-07-07T19:38:46.000+08:00
Use Array.from() to count full code points instead of UTF-16 code
units, preventing lone surrogates in subagent give-up log output.

Co-Authored-By: Claude Opus 4.8 &lt;noreply@anthropic.com&gt;
diff --git a/src/agents/subagent-registry-helpers.ts b/src/agents/subagent-registry-helpers.ts
@@ -76,7 +76,9 @@ export function resolveAnnounceRetryDelayMs(retryCount: number) {
 
 function formatAnnounceGiveUpLogField(value: string): string {
   const normalized = value.replace(/\s+/g, " ").trim();
-  return JSON.stringify(normalized.length > 2_000 ? `${normalized.slice(0, 2_000)}…` : normalized);
+  return JSON.stringify(
+    normalized.length > 2_000 ? `${Array.from(normalized).slice(0, 2_000).join("")}…` : normalized,
+  );
 }
 
 /** Logs a sanitized final give-up line for failed subagent announce delivery. */

Original file line number	Diff line number	Diff line change
`@@ -76,7 +76,9 @@ export function resolveAnnounceRetryDelayMs(retryCount: number) {`
`76`	`76`
`77`	`77`	`function formatAnnounceGiveUpLogField(value: string): string {`
`78`	`78`	`const normalized = value.replace(/\s+/g, " ").trim();`
`79`		- return JSON.stringify(normalized.length > 2_000 ? `${normalized.slice(0, 2_000)}…` : normalized);
	`79`	`+ return JSON.stringify(`
	`80`	+ normalized.length > 2_000 ? `${Array.from(normalized).slice(0, 2_000).join("")}…` : normalized,
	`81`	`+ );`
`80`	`82`	`}`
`81`	`83`
`82`	`84`	`/** Logs a sanitized final give-up line for failed subagent announce delivery. */`